Bringing high quality air monitoring to the Colorado Front Range.

Bringing high quality air monitoring to the Colorado Front Range.

Current Air Monitoring Programs

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Current Air Monitoring Programs


Boulder A.I.R. and Detlev Helmig Peer-Reviewed Publications (past ten years)


Ahmed S., Thomas J.L., Tuite K., Stutz, J., Flocke F., Orlando J.J., Hornbrook R.S., Apel E.C., Emmons L.K., Helmig D., Boylan P., Huey L.G., Hall S.R., Ullmann K., Cantrell C.A., and Fried A. (2022) The Role of Snow in Controlling Halogen Chemistry and Boundary Layer Oxidation During Arctic Spring: A 1D Modeling Case Study. J. Geophys. Res., 10.1029/2021JD036140.
Shupe M.D., Rex M., Blomquist B., Persson P.O.G., Schmale J., Uttal T., Althausen D., Angot H., Archer S., Bariteau L., Beck I., Bilberry J., Bucci S., Buck C., Boyer M., Brasseur Z., Brooks I.M., Calmer R., Cassano J., Castro V., Chu D., Costa D., Cox C.J., Creamean J., Crewell S., Dahlke S., Damm E, de Boer G., Deckelmann H, Dethloff K., Dütsch M., Ebell K., Ehrlich A., Ellis J, Engelmann R., Fong A.A., Frey M.M., Gallagher M.R., Ganzeveld L., Gradinger R., Graeser J., Greenamyer V., Griesche H., Griffiths S., Hamilton J., Heinemann G., Helmig D., Herber A., Heuzé C., Hofer J., Houchens T., Howard D., Inoue J., Jacobi H.-W., Jaiser R., Jokinen T., Jourdan O., Jozef G., King W., Kirchgaessner A., Klingebiel M., Krassovski M., Krumpen T., Lampert A., Landing W., Laurila T., Lawrence D., Lonardi M., Loose B., Lüpkes C., Maahn M., Macke A., Maslowski W., Marsay C., Maturilli M., Mech M., Morris, S., Moser, M., Nicolaus, M., Ortega, P., Osborn, J., Pätzold, F., Perovich, D.K., Petäjä T., Pilz C., Pirazzini R., Posman K., Powers H., Pratt K.A., Preußer A., Quéléver L., Radenz M., Rabe B., Rinke A., Sachs T., Schulz A., Siebert H., Silva T., Solomon A., Sommerfeld A., Spreen G., Stephens M., Stohl A., Svensson G., Uin J., Viegas J., Voigt C., von der Gathen P., Wehner B., Welker J.M., Wendisch M., Werner M., Xie Z.Q., and Yue F. (2022) Overview of the MOSAiC expedition—Atmosphere. Elem. Sci. Anthro. 10. DOI:
Helmig D., Fangmeyer J., Fuchs J., Hueber J., and Smith K. (2022) Evaluation of selected adsorbents for passive sampling of atmospheric oil and natural gas non-methane hydrocarbons. J. Air & Waste Management Association 72, 235-255, DOI: 10.1080/10962247.2021.2000518.


Helmig D., Guenter A., Hueber J., Daly R., Wang W., Park J.-H., Liikanen, A., and Paraplan A.P. (2021) Ozone reactivity measurement of biogenic volatile organic compound emissions. Atmos. Meas. Tech. Dis.
Rossabi S., Hueber J., Wang W., Milmoe P., and Helmig D. (2021) Spatial distribution of atmospheric oil and natural gas volatile organic compounds in the Northern Colorado Front Rane. Elem. Sci. Anthro. 9, DOI: 10.1525/elementa.2019.00036.
Angot H., Davel C., Wiedinmyer C., Petron G., Chopra J., Hueber J., Blanchard B., Bourgeois I., Vimont I., Montzka S.A., Miller B.R., Elkins J.W., and Helmig D. (2021) Temporary pause in the growth of atmospheric ethane and propane in 2015-2018. Atmos. Chem. Phys. 21, 15153-15170,
Pollack I.B., Helmig D., O’Dell K., and Fischer E.V. (2021) Weekend-weekday implications and the impact of wildfire smoke on ozone and its precursors at Boulder Reservoir, Colorado between 2017 and 2019. J. Geophys. Res. 126, DOI: 10.1029/2021JD035221.
Oltmans S.J., Cheadle L.C, Helmig D., Angot H., Petron G., Montzka S.A., Dlugokencky E.J., Miller B., Hall B., Schnell R.C., Kofler J., Wolter S., Crotwell M., Siso C., Tans P. and Andrews A. (2021) Atmospheric oil and natural gas hydrocarbon trends in the Northern Colorado Front Range are notably smaller than inventory emissions reductions. Elem. Sci. Anthro. 9, DOI: 10.1525/elementa.2020.00136.
Darby L.S., Senff C.J., Alvarez R.J. II, Banta R.M., Bianco L., Helmig D., and White A.B. (2021) Spatial and temporal variability of ozone along the Colorado Front Range occurring over two days with contrasting wind flow. Elem. Sci. Anthro. 9, DOI: 10.1525/elementa.2020.00146.
Pollack I.B., Helmig D., O’Dell K., and Fischer E.V. (2021) Seasonality and source apportionment of non-methane organic compounds at Boulder Reservoir Colorado, between 2017-2019. J. Geophys. Res., DOI: 10.1029/2020JD034234.
Asher, E., Hills A.J., Hornbrook R.S., Shertz S., Gabbard S., Stephens B.B., Helmig D., and Apel E.C. (2021) Unpiloted aircraft system instrument for the rapid collection of whole air samples and measurements for environmental monitoring and air quality studies. Environ. Sci. Technol., doi:10.1021/acs.est.0c07213.


Pozzer A., Schultz M.G., Helmig D. (2020) Impact of U.S. oil and natural gas emission increases on surface ozone is most pronounced in the Central United States. Environ. Sci. Technol. 54, 12423–12433.
Helmig D. (2020) Air quality impacts of oil and natural gas development in Colorado. Elem. Sci. Anth. 8, 1-33.
Wang W., Ganzeveld, L., Rossabi S., Hueber J., and Helmig, D. (2020) Measurement report: Leaf-scale gas exchange of atmospheric reactive trace species (NO2, NO, O3) at a northern hardwood forest in Michigan. Atmos. Chem. Phys. 20, 11287-11304. DOI: 10.5194/acp-20-11287-2020
Helmig D., Liptzin D., Hueber J., and Savarino J. (2020) Impact of exhaust emissions on chemical snowpack composition at Concordia Station, Antarctica. The Cryosphere 14, 199-209. DOI: 10.5194/tc-14-199-2020
Pound R.J., Sherwen T., Helmig D., Carpenter L.J. and Evans M.J. (2020) Influences of oceanic ozone deposition on tropospheric photochemistry. Atmos. Chem. Phys. 20, 4227-4239.
Howard D., Agnan Y., Helmig D., Yang Y. and Obrist D. (2020) Environmental controls on ecosystem-scale cold-season methane and carbon dioxide fluxes in an Arctic tundra ecosystem. Biogeosciences 17, 4025-4042.
Clifton O. E., Fiore A. M., Massman W. J., Baublitz C. B., Coyle M., Emberson L., Fares S., Farmer D.F., Gentine P., Gerosa G., Guenther A.B., Helmig D., Lombardozzi D.L., Munger J.W., Patton E.G., Pusede S.E., Schwede D.B., Silva S.J., Soergel M., Steiner A.L. and Tai A.P.K. (2020) Dry deposition of ozone over land: Processes, measurement, and modeling. Rev. Geophys. 58, e2019RG000670.


Jiskra M., Sonke J.E., Agnan Y., Helmig D., and Obrist D. (2019) Insight from mercury stable isotopes on terrestrial–atmosphere exchange of Hg(0) in the Arctic tundra. Biogeosciences 16, 4051-4064.
Tzompa-Sosa Z. A., Henderson B. H., Keller C. A., Travis K., Mahieu E., Franco B., Estes M., Helmig D., Fried A., Richter D., Weibring P., Walega J., Blake D. R, Hannigan J. W., Ortega I., Conway S., Strong K., Fischer E. V. (2019) Atmospheric implications of large C2-C5 alkane emissions from the US oil and gas industry. J. of Geophys. Res. 124, 1148-1169. DOI: 10.1029/2018JD028955
Trowbridge A. M., Stoy P. C., Adams H. D., Law D., Breshears D. D., Daly R. W., Helmig D., and Monson R. K. (2019) Drought supersedes warming in determining volatile and tissue defenses of piñon pine (Pinus edulis). Environ. Res. Lett. 14, article 065006. DOI: 10.1088/1748-9326/ab1493
Choudoir M., Rossabi S., Gerbert M., Helmig D., and Fierer N. (2019) A phylogenetic and functional perspective on volatile organic compound production by Actinobacteria. mSystems 4, article e00295-18. DOI: 10.1128/mSystems.00295-18.
Oltmans S. J., Cheadle L. C., Johnson B. J., Schnell R. C., Sterling C., Thompson A. M., Helmig D., Cullis P., Hall E., Jordan A., McClure-Begley A., Sullivan J. T., McGee T. P., and Wolfe D. (2019) Boundary layer ozone in the Northern Colorado Front Range in July-August 2014 during FRAPPE and DISCOVER-AQ from vertical profile measurements. Elem. Sci. Anth. 7, 1-14.


Torres C., Suárez L., Schmitt C., Estevan R., and Helmig D. (2018) Measurement of light absorbing particles in the snow of the Huaytapallana glacier in the central Andes of Peru and its effect on albedo and radiative forcing, Atomic & Molecular Physics & Optics, 51(N4).
Tzompa-Sosa Z., Richter D., Henderson B., Travis K., Keller C., Mahieu E., Franco B., Estes M., Helmig D., Fried A., Weibring P., Walega J., Blake D., Hannigan J., Ortega I., Conway S., Strong K., and Fischer E. (2018) Atmospheric implications of large light alkane emissions from the U.S. oil and gas industry. J. Geophys. Res. 124, 1148-1169.
McKenzie L. M., Blair B., Hughes J., Allshouse W. B., Blake N. J., Helmig D., Milmoe P., Halliday H., Blake D. R., and Adgate J. L. (2018) Corrections to “Ambient nonmethane hydrocarbon levels along Colorado’s Northern Front Range: Acute and chronic health risks”. Environ. Sci. & Technol. 52, 4514-4525, doi:10.1021/acs.est.8b06179.
Thompson R. L., Nisbet E. G., Pisso I., Stohl A., Blake D., Dlugokencky E. J., Helmig D., and White J. W. C. (2018) Variability in atmospheric methane from fossil fuel and microbial sources over the last three decades. Geophys. Res. Lett. 45, 11,499–11,508.
Helmig, D., Blanchard B., and Hueber, J. (2018), Contrasting behavior of slow and fast photoreactive gases during the August 21, 2017, solar eclipse. Elem. Sci. Anth. 6, 1-13, doi: 10.1525/elementa.322.
Bien T. and Helmig D. (2018) Changes in the summertime ozone chemistry in Colorado during 2000 – 2015. Elem. Sci. Anth. 6, 1-25, doi: 10.1525/elementa.300.
Monks S. A., Wilson C., Emmons L. K., Hannigan J., Helmig D., Blake N. J., and Blake D. R. (2018) Using an inverse model to reconcile differences in simulated and observed global ethane concentrations and trends between 2008 and 2014. J. Geophys. Res. 123, 11,262-11,282, doi:10.1029/2017JD028112.
Rossabi S., Choudoir M., Helmig D., Hueber J., and Fierer N. (2018),Volatile organic compound emissions from soil following wetting events. J. Geophys. Res. Biogeosciences, 123, 1988-2001, doi:10.1029/2018JG004514.
Song S., Angot H., Selin N. E., Gallée H., Sprovieri F., Pirrone N., Helmig D., Savarino J., Magand O., and Dommergue A. (2018) Understanding mercury oxidation and air-snow exchange on the East Antarctic Plateau: A modeling study, Atmos. Chem. Phys. 18, 15825-15840, doi:10.5194/acp-2018-436.
Agnan Y., Douglas T. A., Helmig D., Hueber J., and Obrist D. (2018) Mercury in the Arctic tundra snowpack: temporal and spatial concentration patterns and trace gas exchanges. The Cryosphere 12, 1939-1956, doi:10.5194/tc-12-1939-2018.
McKenzie L. M., Blair B., Hughes J., Allshouse W. B., Blake N. J., Helmig D., Milmoe P., Halliday H., Blake D. R., and Adgate J. L. (2018) Ambient nonmethane hydrocarbon levels along Colorado's Northern Front Range: Acute and chronic health risks, Environ. Sci. Technol. 52, 4514-4525, doi:10.1021/acs.est.7b05983.
Feldman D. R., Collins W. D., Biraud S. C., Risser M. D., Turner D. D., Gero P. J., Tadić J., Helmig D., Xie S., Mlawer E. J., Shippert T. R., and Torn M. S. (2018) Observationally derived rise in methane surface forcing mediated by water vapour trends. Nature Geosci. 11, 238-243, doi:10.1038/s41561-018-0085-9.
Rossabi S., and Helmig D. (2018) Changes in atmospheric butanes and pentanes and their isomeric ratios in the Continental United States. J. Geophys. Res. 123, 3772-3790, doi:10.1002/2017JD027709.
Dalsøren S.B., Myhre G., Hodnebrog Ø., Myhre C.L., Stohl A., Pisso I., Schwietzke S., Höglund-Isaksson L., Helmig D., Reimann S., Sauvage S., Schmidbauer N., Read K.A., Carpenter L.J., Lewis A.C., Punjabi S., and Wallasch M. (2018) Discrepancy between simulated and observed ethane and propane levels explained by underestimated fossil emissions. Nature Geosci. 11, 178–184.


Huang Y., Wu S., Kramer L. J., Helmig D., and Honrath R. E. (2017) Surface ozone and its precursors at Summit, Greenland: Comparison between observations and model simulations. Atmos. Chem. Phys. 17, 14661-14674, doi:10.5194/acp-17-14661-2017.
Matichuk R., Tonnesen G., Luecken D., Gilliam R., Napelenok S. L., Baker K. R., Schwede D., Murphy B., Helmig D., Lyman S. N., and Roselle S. (2017) Evaluation of the Community Multiscale Air Quality Model for simulating winter ozone formation in the Uinta Basin. J. Geophys. Res. 122. 13,545-13,572, doi:10.1002/2017JD027057.
Schultz M. G., Schröder S., Lyapina O., Cooper O., Galbally I., Petropavlovskikh I., Schneidemesser E. v., Tanimoto H., Elshorbany Y., Naja M., Seguel R. J., Dauert U., Eckhardt P., Feigenspan S., Fiebig M., Hjellbrekke A.-G., Hong Y.-D., Kjeld P. C., Koide H., Lear G., Tarasick D., Ueno M., Wallasch M., Baumgardner D., Chuang M.-T., Gillett R., Lee M., Molloy S., Moolla R., Wang T., Sharps K., Adame J. A., Ancellet G., Apadula F., Artaxo P., Barlasina M. E., Bogucka M., Bonasoni P., Chang L., Colomb A., Cuevas E., Cupeiro M., Degorska A., Ding A., Fröhlich M., Frolova M., Gadhavi H., Gheusi F., Gilge S., Gonzalez M. Y., Gros V., Hamad S. H., Helmig D., Henriques D., Hermansen O., Holla R., Hueber J., Im U., Jaffe D. A., Komala N., Kubistin D., Lam K.-S., Laurila T., Lee H., Levy I., Mazzoleni C., Mazzoleni L., McClure-Begley A., Mohamad M., Murovec M., Navarro-Comas M., Nicodim F., Parrish D., Read K. A., Reid N., Ries L., Saxena P., Schwab J. J., Scorgie Y., Senik I., Simmonds P., Sinha V., Skorokhod A. I., Spain G., Spangl W., Spoor R., Springston S. R., Steer K., Steinbacher M., Suharguniyawan E., Torre P., Trickl T., Weili L., Weller R., Xiaobin X., Xue L., and Zhiqiang M. (2017) Tropospheric Ozone Assessment Report: Database and metrics data of global surface ozone observations, Elem. Sci. Anth. 5, 1-26, doi: 10.1525/elementa.244.
Obrist D., Agnan Y., Jiskra M., Olson C.L., Colegrove D.P., Hueber J., Moore C.W., Sonke J.E., and Helmig D. (2017) Tundra uptake of atmospheric elemental mercury drives Arctic mercury pollution. Nature GeoSci. 547, 201-204.
Newland M.J., Martinerie P., Witrant E., Helmig D., Worton D.R., Hogan C., Sturges W.T., and Reeves C.E. (2017) Changes to the chemical state of the Northern Hemisphere atmosphere during the second half of the twentieth century. Atmos. Chem. Phys. 17, 8269-8283.
Tzompa-Sosa Z.A., Mahieu E., Franco B., Keller C.A., Turner A.J., Helmig D., Fried A., Richter D., Weibring P., Walega J., Yacovitch T.I., Herndon S.C., Blake D.R., Hase F., Hannigan J.W., Conway S., Strong K., Schneider M., and Fischer E.V. (2017) Revisiting global fossil fuel and biofuel emissions of ethane. J. Geophys. Res. 122, 2493–2512, doi:10.1002/ 2016JD025767.
Zhang B., Owen R.C., Perlinger J.A., Helmig D., Martín M.V., Kramer L., Mazzoleni L.R., and Mazzoleni C. (2017) Ten-year chemical signatures associated with long-range transport observed in the free troposphere over the central North Atlantic. Elem. Sci. Anth. 5:1-20, doi: 10.1525/elementa.194.
Evans J.M., and Helmig D. (2017) Investigation of the influence of transport from oil and natural gas regions on elevated ozone levels in the northern Colorado front range. J. Air Waste Manag. Assoc. 67, 196-211.


Oltmans S.J., Karion A., Schnell R.C., Pétron G., Sweeney C., Helmig D., Montzka S.A., Wolter S., Neff D., Miller B.R., Hueber J., Conley S., and Johnson B.J. (2016) O3, CH4, CO2, CO, NO2, and NMHC aircraft measurements in the Uinta Basin oil and gas region under low and high ozone conditions in winter 2012 and 2013. Elem. Sci. Anth. 4: 1-12, doi: 10.12952/journal.elementa.000132.
Pollmann J., Helmig D., Liptzin D., Thompson C.R., Hueber J., Tans P.P., and Lelieveld J. (2016) Variability analyses, site characterization, and regional [OH] estimates using trace gas measurements from the NOAA Global Greenhouse Gas Reference Network. Elem. Sci. Anth. 4, 1-20, doi: 10.12952/journal.elementa.000128.
Schnell R.C., Johnson B.J., Oltmans S.J., Cullis P., Sterling C., Hall E., Jordan A., Helmig D., Petron G., Ahmadov R., Wendell J., Albee R., Boylan P., Thompson C.R., Evans J., Hueber J., Curtis A.J., and Park J.-H. (2016) Quantifying wintertime boundary layer ozone production from frequent profile measurements in the Uinta Basin, UT, oil and gas region. J. Geophys. Res. 121, 11,038-011,054.
Angot H., Magand O., Helmig D., Ricaud P., Quennehen B., Gallée H., Del Guasta M., Sprovieri F., Pirrone N., Savarino J., and Dommergue A. (2016) New insights into the atmospheric mercury cycling in central Antarctica and implications on a continental scale. Atmos. Chem. Phys. 16, 8249-8264.
Helmig D., Rossabi S., Hueber J., Tans P., Montzka S.A., Masarie K., Thoning K., Plass-Duelmer C., Claude A., Carpenter L.J., Lewis A.C., Punjabi S., Reimann S., Vollmer M.K., Steinbrecher R., Hannigan J.W., Emmons L.K., Mahieu E., Franco B., Smale D., and Pozzer A. (2016) Reversal of global atmospheric ethane and propane trends largely due to US oil and natural gas production. Nature GeoSci. 9, 490-495.
Legrand M., Preunkert S., Savarino J., Frey M.M., Kukui A., Helmig D., Jourdain B., Jones A.E., Weller R., Brough N., and Gallée H. (2016) Inter-annual variability of surface ozone at coastal (Dumont d'Urville, 2004–2014) and inland (Concordia, 2007–2014) sites in East Antarctica. Atmos. Chem. Phys. 16, 8053-8069.
Van Dam B., Helmig D., Doskey P.V., and Oltmans S.J. (2016) Summertime surface O3 behavior and deposition to tundra in the Alaskan Arctic. J. Geophys. Res. 121, doi:10.1002/2015JD023914.


Kramer L.J., Helmig D., Burkhart J.F., Stohl A., Oltmans S., and Honrath R.E. (2015) Seasonal variability of atmospheric nitrogen oxides and non-methane hydrocarbons at the GEOSummit station, Greenland. Atmos. Chem. Phys. 15, 6827-6849.
Van Dam B., Helmig D., Toro C., Doskey P., Kramer L., Murray K., Ganzeveld L., and Seok B. (2015) Dynamics of ozone and nitrogen oxides at Summit, Greenland: I. Multi-year observations in the snowpack. Atmos. Environ. 123, Part A, 268-284.
Schultz M.G., Akimoto H., Bottenheim J., Buchmann B., Galbally I.E., Gilge S., Helmig D., Koide H., Lewis A.C., Novelli P.C., Plass-Dülmer C., Ryerson T.B., Steinbacher M., Steinbrecher R., Tarasova O., Tørseth K., Thouret V., and Zellweger C. (2015) The Global Atmosphere Watch reactive gases measurement network. Elem. Sci. Anth. 3, 1-23, doi: 10.12952/journal.elementa.000067.
Murray K.A., Kramer L.J., Doskey P.V., Ganzeveld L., Seok B., Van Dam B., and Helmig D. (2015) Dynamics of ozone and nitrogen oxides at Summit, Greenland. II. Simulating snowpack chemistry during a spring high ozone event with a 1-D process-scale model. Atmos. Environ. 117, 110-123.
Liptzin D., Helmig D., Schmidt S.K., Seok B., and Williams M.W. (2015) Winter gas exchange between the atmosphere and snow-covered soils on Niwot Ridge, Colorado, USA. Plant Ecology & Diversity, 1-12.
Helmig D., Munoz M., Hueber J., Mazzoleni C., Mazzoleni L., Owen R.C., Val Martin M., Fialho P., Plass-Duelmer C., Palmer P.I., Lewis A.C., and Pfister G. (2015) Climatology and atmospheric chemistry of the non-methane hydrocarbons ethane and propane over the North Atlantic. Elem. Sci. Anth. 3, 1-15, doi: 10.12952/journal.elementa.000054.
Gray C. M., Helmig D., Fierer N. (2015) Bacteria and fungi associated with isoprene consumption in soil. Elem. Sci. Anth. 3, 1-10, doi: 10.12952/journal.elementa.000053.
Hu L., Millet D.B., Baasandorj M., Griffis T.J., Turner P., Helmig D., Curtis A.J., and Hueber J. (2015) Isoprene emissions and impacts over an ecological transition region in the U.S. Upper Midwest inferred from tall tower measurements. J. Geophys. Res. 120, 3553–3571. doi: 10.1002/2014JD022732.
Preunkert, S., Legrand, M., Frey, M. M., Kukui, A., Savarino, J., Gallée, H., King, M., Jourdain, B., Vicars, W., and Helmig, D. (2015) Formaldehyde (HCHO) in air, snow, and interstitial air at Concordia (East Antarctic Plateau) in summer, Atmos. Chem. Phys. 15, 6689-6705, doi:10.5194/acp-15-6689-2015.
Boylan P., Helmig D., Oltmans S. (2015) Ozone in the Atlantic Ocean marine boundary layer. Elem. Sci. Anth. 3, 1-13, doi: 10.12952/journal.elementa.000045.
Dzepina K., Mazzoleni C., Fialho P., China S., Zhang B., Owen R.C., Helmig D., Hueber J., Kumar S., Perlinger J.A., Kramer L.J., Dziobak M.P., Ampadu M.T., Olsen S., Wuebbles D.J., and Mazzoleni L.R. (2015) Molecular characterization of free tropospheric aerosol collected at the Pico Mountain Observatory: A case study with a long-range transported biomass burning plume. Atmos. Chem. Phys. 15, 5047-5068.
Seok B., Helmig D., Liptzin D., Williams M.W., Vogel C.S. (2015) Snowpack-atmosphere gas exchanges of carbon dioxide, ozone, and nitrogen oxides at a hardwood forest site in northern Michigan. Elem. Sci. Anth. 3, 000040. doi: 10.12952/journal.elementa.000040
China S., Scarnato B., Owen R.C., Zhang B., Ampadu M.T., Kumar S., Dzepina K., Dziobak M.P., Fialho P., Perlinger J.A., Hueber J., Helmig D., Mazzoleni L.R., Mazzoleni C. (2015) Morphology and mixing state of aged soot particles at a remote marine free troposphere site: Implications for optical properties. Geophys. Res. Lett. 42, 1243-1250, 2014GL062404.
Lawson S.J., Selleck P.W., Galbally I.E., Keywood M.D., Harvey M.J., Lerot C., Helmig D., Ristovski Z. (2015) Seasonal in situ observations of glyoxal and methylglyoxal over the temperate oceans of the Southern Hemisphere. Atmos. Chem. Phys. 15, 223-240.
Emmons L.K., Arnold S.R., Monks S.A., Huijnen V., Tilmes S., Law K.S., Thomas J.L., Raut J.C., Bouarar I., Turquety S., Long Y., Duncan B., Steenrod S., Strode S., Flemming J., Mao J., Langner J., Thompson A.M., Tarasick D., Apel E.C., Blake D.R., Cohen R.C., Dibb J., Diskin G.S., Fried A., Hall S.R., Huey L.G., Weinheimer A.J., Wisthaler A., Mikoviny T., Nowak J., Peischl J., Roberts J.M., Ryerson T., Warneke C., and Helmig D. (2015) The POLARCAT Model Intercomparison Project (POLMIP): overview and evaluation with observations, Atmos. Chem. Phys. 15, 6721-6744.
Ahmadov R., McKeen S., Trainer M., Banta R., Brewer A., Brown S., Edwards P.M., de Gouw J.A., Frost G.J., Gilman J., Helmig D., Johnson B., Karion A., Koss A., Langford A., Lerner B., Olson J., Oltmans S., Peischl J., Pétron G., Pichugina Y., Roberts J.M., Ryerson T., Schnell R., Senff C., Sweeney C., Thompson C., Veres P.R., Warneke C., Wild R., Williams E.J., Yuan B., Zamora R. (2015) Understanding high wintertime ozone pollution events in an oil- and natural gas-producing region of the western US. Atmos. Chem. Phys. 15, 411-429.


Thompson C., Hueber J., and Helmig D. (2014) Influence of oil and gas emissions on ambient atmospheric non-methane hydrocarbons in residential areas of Northeastern Colorado. Elem. Sci. Anth. 3, 000035, 1-17. doi: 10.12952/journal.elementa.000035
Edwards P.M., Brown S.S., Roberts J.M., Ahmadov R., Banta R.M., deGouw J.A., Dube W.P., Field R.A., Flynn J.H., Gilman J.B., Graus M., Helmig D., Koss A., Langford A.O., Lefer B.L., Lerner B.M., Li R., Li S.-M., McKeen S.A., Murphy S.M., Parrish D.D., Senff C.J., Soltis J., Stutz J., Sweeney C., Thompson C.R., Trainer M.K., Tsai C., Veres P.R., Washenfelder R.A., Warneke C., Wild R.J., Young C.J., Yuan B., Zamora R. (2014) High winter ozone pollution from carbonyl photolysis in an oil and gas basin. Nature 514, 351-354.
Oltmans S.J., Karion A., Schnel, R.C., Pétron G., Sweeney, C., Wolter S., Neff D., Montzka S.A., Miller B. R., Helmig D., Johnson B.J., and Hueber J. (2014) A high ozone episode in winter 2013 in the Uinta Basin oil and gas region characterized by aircraft measurements, Atmos. Chem. Phys. Discuss. 14, 20117-20157, doi:10.5194/acpd-14-20117-2014.
Trowbridge A.M., Daly R.W., Helmig D., Stoy P.C., and Monson R.K. (2014) Herbivory and climate interact serially to control monoterpene emissions from pinyon pine forests. Ecology 95, 1591-1603.
Curtis A.J., Helmig D., Baroch C., Daly R., and Davis S. (2014) Biogenic volatile organic compound emissions from nine tree species used in the City and County of Denver, Colorado urban tree planting program. Atmos. Environ. 95, 634-643.
Boylan P., Helmig D. and Park J.H. (2014) Characterization and mitigation of water vapor effects in the measurement of ozone by chemiluminescence with nitric oxide. Atmos. Meas. Tech. 7, 1231-1244.
Pétron G., Karion A., Sweeney C., Miller B.R., Montzka S.A., Frost G., Trainer M., Tans P., Helmig D., Andrews A., Kofler J., Guenther D., Dlugokencky E., Lang P., Newberger T., Wolter S., Hall B., Novelli P., Brewer A., Conley S., Hardesty M., Banta R., White A., Noone D., Wolfe D., and Schnell R. (2014) A new look at hydrocarbons emissions from oil and gas operations in the Colorado Denver-Julesburg Basin. J. Geophys. Res. 119, 6836-6852.
Rhoderick G.C., Duewer D.L., Apel E., Baldan A., Hall B., Harling A., Helmig D., Heo G.S., Hueber J., Kim M.E., Kim Y.D., Miller B., Montzka S., Riemer D. (2014) International comparison of a hydrocarbon gas standard at the pmol/mol level. Anal. Chem. 86, 2580-2589,
Helmig D., Petrenko V., Martinerie P., Witrant E., Röckmann T., Zuiderweg A., Holzinger R., Hueber J., Thompson C., White J.W.C., Sturges W., Baker A., Blunier T., Etheridge D., Rubino M., and Tans P. (2014)
Reconstruction of Northern Hemisphere 1950 – 2010 atmospheric non-methane hydrocarbons. Atmos. Chem. Phys. 14, 1463-1483, doi:10.5194/acpd-14-1463-2014.
Helmig D., Stephens C.R., Evans J., Boylan P., Hueber J., and Park J.-H. (2014) Highly elevated atmospheric levels of volatile organic compounds in the Uintah Basin, Utah. Environ. Sci. Technol. 48, 4707-4715, 10.1021/es405046r.
Boylan P., Helmig D., Staebler R., Turnipseed A., Fairall C.W., and Neff W. (2014) Boundary layer dynamics during the Ocean-Atmosphere-Sea-Ice-Snow (OASIS) 2009 experiment at Barrow, AK. J. Geophys. Res. 19, 2261-2278, 10.1002/2013JD020299.
Zhang B., Owen R.C., Perlinger J.A., Kumar A., Wu S., Val Martin M., Kramer L., Helmig D., and Honrath R.E. (2014) A semi-Lagrangian view of ozone production tendency in North American outflow in summers 2009 and 2010. Atmos. Chem. Phys. 14, 2267-2287.


Helmig D., Stephens C.R., Caramore J., and Hueber J. (2013) Seasonal behavior of non-methane hydrocarbons in the firn air at Summit, Greenland. Atmos. Environ., 85, 234-246.
Fain X., Helmig D., Hueber J., Obrist D., and Williams M.W. (2013) Mercury dynamics in the Rocky Mountain, Colorado, Snowpack. Biogeosciences, 10, 3793-3807, doi:10.5194/bg-10-3793-2013.
Kumar A., Wu S., Weise M.F., Honrath R., Owen R.C., Helmig D., Kramer L., Val Martin M., and Li Q. (2013) Free troposphere ozone and carbon monoxide over the North Atlantic for 2001-2011. Atmos. Chem. Phys. 13, 12537-12547.
Van Dam B.A., Helmig D., Neff W., Kramer L. (2013) Evaluation of boundary layer depth estimates at Summit Station, Greenland. J. Applied Meteorology and Climatology 52, 2356-2362.
Helmig D., Daly R.W., Milford J., and Guenther A. (2013) Seasonal trends in biogenic terpene emissions. Chemosphere 93, 35 - 46.
Edwards P.M., Young C.J., Aikin K., deGouw J.A., Dubé W.P., Geiger F., Gilman J.B., Helmig D., Holloway J.S., Kercher J., Lerner B., Martin R., McLaren R., Parrish D.D., Peischl J., Roberts J.M., Ryerson T.B., Thornton J., Warneke C., Williams E.J., and Brown S.S. (2013) Ozone photochemistry in an oil and natural gas extraction region during winter: simulations of a snow-free season in the Uintah Basin, Utah. Atmos. Chem. Phys. 13, 8955-8971.
Seok, B., Helmig, D., Ganzeveld, L., Williams, M. W., and Vogel, C. S.: Dynamics of nitrogen oxides and ozone above and within a mixed hardwood forest in northern Michigan, Atmos. Chem. Phys. 13, 7301-7320, doi:10.5194/acp-13-7301-2013, 2013.
Hu L., Millet D. B., Kim S. Y., Wells K. C., Griffis T. J., Fischer E. V., Helmig D., Hueber J., and Curtis A. J. (2013) North American acetone sources determined from tall tower measurements and inverse modeling. Atmos. Chem. Phys. 13, 3379-3392, doi:10.5194/acp-13-3379-2013, 2013.
Palmer P. I., Parrington M., Lee J. D., Lewis A. C., Rickard A. R., Bernath P. F., Duck T. J., Waugh D. L., Tarasick D. W., Andrews S., Aruffo E., Bailey L. J., Barrett E., Bauguitte S. J.-B., Curry K. R., Di Carlo P., Chisholm L., Dan L., Forster G., Franklin J. E., Gibson M. D., Griffin D., Helmig D., Hopkins J. R., Hopper J. T., Jenkin M. E., Kindred D., Kliever J., Le Breton M., Matthiesen S., Maurice M., Moller S., Moore D. P., Oram D. E., O'Shea S. J., Christopher Owen R., Pagniello C. M. L. S., Pawson S., Percival C. J., Pierce J. R., Punjabi S., Purvis R. M., Remedios J. J., Rotermund K. M., Sakamoto K. M., da Silva A. M., Strawbridge K. B., Strong K., Taylor J., Trigwell R., Tereszchuk K. A., Walker K. A., Weave, D., Whaley C., and Young J. C. (2013) Quantifying the impact of BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites (BORTAS) experiment: design, execution and science overview. Atmos. Chem. Phys. 13, 6239-6261.
Van Dam B., Helmig D., Burkhard J. F., Obrist D., and Oltmans S. (2013) Springtime boundary layer ozone and GEM depletion at Toolik Lake, Alaska. J. Geophys. Res. Atmos., 118, 3382–3391, doi:10.1002/jgrd.50213.


Helmig D., Boylan P., Johnson B., Oltmans S., Fairall C., Staebler R., Weinheimer A., Orlando J., Knapp D., Montzka D., Flocke F., Freiß U., Sihler H., and Shepson P. (2012) Ozone dynamics and snow-atmosphere exchanges during ozone depletion events at Barrow, Alaska. J. Geophys. Res., 117, D20303. doi:10.1029/2012JD017531.
Pratt K.A., Mielke L.H., Shepson P.B., Bryan A.M., Steiner A.L., Ortega J., Daly R., Helmig D., Vogel C.S. Griffith S., Dusanter S., Stevens P.S., Alaghmand M. (2012) Contributions of individual reactive biogenic volatile organic compounds to organic nitrates above a mixed forest. Atmos. Chem. Phys. 12, 10125-10143.
Bryan A.M., Bertman S.B., Carroll M.A., Dusanter S., Edwards G.D., Forkel R., Griffith S., Guenther A.B., Hansen R.F., Helmig D., Jobson B.T., Keutsch F.N., Lefer B.L., Pressley S.N., Shepson P.B., Stevens P.S., and Steiner A.L. (2012) In-canopy gas-phase chemistry during CABINEX 2009: sensitivity of a 1-D canopy model to vertical mixing and isoprene chemistry. Atmos. Chem. Phys. 12, 8829-8849.
Simpson I.J., Andersen M.P.S., Meinardi S., Bruhwiler L., Blake N.J., Helmig D., Rowland F.S., and Blake D.R. (2012) Long-term decline of global atmospheric ethane concentrations and implications for methane. Nature 488, 490-494.
Van Dam B. and Helmig D. (2012) Comments on 'Possible contribution of triboelectricity to snow-air interactions'. Environ. Chem. 9, 116-118.
Helmig D., Lang E.K., Bariteau L., Boylan P., Fairall C.W., Ganzeveld L., Hare J.E., Hueber J., and Pallandt M. (2012) Atmosphere-ocean ozone fluxes during the TexAQS 2006, STRATUS 2006, GOMECC 2007, GasEx 2008, and AMMA 2008 cruises. J. Geophys. Res., 117, D04305, doi:10.1029/2011JD015955.
Baghi R., Helmig D., Guenther A., Duhl T. and Daly R. (2012) Contribution of flowering trees to urban atmospheric biogenic volatile organic compound emissions. Biogeosciences 9, 3777-3785.
Parrington M., Palmer P.I., Henze D.K., Tarasick D.W., Hyer E.J., Owen R.C., Helmig D., Clerbaux C., Bowman K.W., Deeter M.N., Barratt E.M., Coheur P.-F., Hurtmans D., Jiang Z., George M., and J. R. Worden (2012) The influence of boreal biomass burning emissions on the distribution of tropospheric ozone over North America and the North Atlantic during 2010. Atmos. Chem. Phys., 12, 2077-2098, 2012.


Fairall C. W., Yang M., Bariteau L., Edson J.B., Helmig D., McGillis W., Pezoa S., Hare J.E., Huebert B., and Blomquist B. (2011) Implementation of the coupled ocean-atmosphere response experiment flux algorithm with CO2, dimethyl sulfide, and O3. J. Geophys. Res., 116, Article # C00F09, doi:10.1029/2010JC006884.
Edson J.B., Fairall C.W., Bariteau L., Zappa C.J., Cifuentes-Lorenzen A., McGillis W.R., Pezoa S., Hare J.E., and Helmig D. (2011) Direct covariance measurement of CO2 gas transfer velocity during the 2008 Southern Ocean gas experiment: Wind speed dependency. J. Geophys. Res. 116, Article # C00F10, DOI: 10.1029/2011JC007022.
Brodin M., Helmig D., Johnson B., and Oltmans S. (2011) Comparison of ozone concentrations on a surface elevation gradient with balloon-borne ozonesonde measurements. Atmos. Environ. 45, 5431-5439.
Grachev A. A., Bariteau L., Fairall C.W., Hare J.E., Helmig D., Hueber J., and Lang E.K. (2011) Turbulent fluxes and transfer of trace gases from ship-based measurements during TexAQS 2006, J. Geophys. Res., 116, D13110, doi:10.1029/2010JD015502.
Hu L., Millet D.B., Mohr M.J., Wells K.C., Griffis K.C., and Helmig D. (2011) Sources and seasonality of atmospheric methanol based on tall tower measurements in the US Upper Midwest. Atmos. Chem. Phys. 11, 11145-11156.
Bocquet F., Helmig D., Van Dam B.A., and Fairall C.W. (2011) Evaluation of the flux gradient technique for measurement of ozone fluxes over snowpack at Summit, Greenland. Atmos. Meas. Tech. 4, 2305-2321.
Duhl T.R., Guenther A., and Helmig D. (2011) Estimating urban vegetation cover fraction using Google Earth images. Journal of Land Use Science, 1-19.


Bariteau, L., Helmig D., Fairall C.W., Hare J.E., Hueber J., and Lang E.K. (2010) Determination of oceanic ozone deposition by ship-borne eddy covariance flux measurements. Atmos. Measurement Techniques 3, 441-455.
Brodin M., Helmig D., and Oltmans S.J. (2010) Seasonal ozone behavior along an elevation gradient in the Colorado Front Range Mountains. Atmos. Environ., 44, 5304-5315.
Pozzer A., Pollmann J., Taraborrelli D., Jöckel P., Helmig D., Tans P., Hueber J., and Lelieveld J. (2010) Observed and simulated global distribution and budget of atmospheric C2-C5 alkanes. Atmos. Chem. Phys. 10, 4403-4422.


News coverage of Boulder AIR's work

Compost Colorado: “Project A.I.R.E (AIR Quality Investigation & Research for Equity)

View Alexa Smith's recent reporting on Boulder AIR's collaboration with Compost Colorado and the local nonprofit Cultivando to monitor the Suncor refinery in Commerce City via the A.I.R.E pollution study. (March 22, 2022)

”9NEWS: “Suncor and third-party nonprofit both monitoring air quality in Commerce City neighborhood”

View Katie Eastman's recent reporting on Boulder AIR's collaboration with the local nonprofit Cultivando to monitor the Suncor refinery in Commerce City. (February 17, 2022)

Larimer Alliance Blog: “THE BOULDERAIR TOUR ROCKED!”

Read Rick Casey’s excellent blog post on the recent community leader tour of the Broomfield air monitoring site and the need to expand air monitoring programs across the Front Range. (September 26, 2021)

Boulder A.I.R research contributes to Who-What-Why article on fracking and health.

Read Max Steiner’s article on Fracking and Health: Colorado Locals Aim to Clear the Air. (June 24, 2021)

Left Hand Valley Courier: Remarkable Spikes in Northern Colorado air Pollution

Reporter Patricia Logan interviews Dr. Detlev Helmig about his recent presentation to the Longmont City Council on recent spikes in oil and gas related volatile organic compounds. (April 14, 2021)

Longmont City Council Presentation

Progress report on recent air quality to the Longmont City Council. (April 6, 2021)

Boulder Daily Camera: Coronavirus Orders did not improve Boulder Air Quality

The Boulder Daily Camera’s journalist Katie Langford interviews Dr. Detlev Helmig about Boulder air quality during the coronavirus era. (October 8, 2020)

KGNU: The Shale Revolution

KGNU’s Jill Sjong and Dr. Detlev Helmig discuss air pollution in Weld County and along the Front Range
as it relates to fracking, climate change, and human health hazards. (October 6, 2020)

Colorado State: Health Impacts of oil and gas Medical Symposium

Presentation by Dr. Detlev Helmig on the air quality impacts from oil & natural gas volatile organic compound emissions. (February 2, 2019)

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