Articles | Volume 19, issue 16
https://doi.org/10.5194/acp-19-10697-2019
https://doi.org/10.5194/acp-19-10697-2019
Research article
 | 
26 Aug 2019
Research article |  | 26 Aug 2019

Photochemical production of ozone and emissions of NOx and CH4 in the San Joaquin Valley

Justin F. Trousdell, Dani Caputi, Jeanelle Smoot, Stephen A. Conley, and Ian C. Faloona

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Cited articles

Akagi, S. K., Yokelson, R. J., Wiedinmyer, C., Alvarado, M. J., Reid, J. S., Karl, T., Crounse, J. D., and Wennberg, P. O.: Emission factors for open and domestic biomass burning for use in atmospheric models, Atmos. Chem. Phys., 11, 4039–4072, https://doi.org/10.5194/acp-11-4039-2011, 2011. 
Almaraz, M., Bai, E., Wang, C., Trousdell, J., Conley, S., Faloona, I., and Houlton, B. Z.: Agriculture is a major source of NOx pollution in California, Science Advances, 4, https://doi.org/10.1126/sciadv.aao3477, 2018. 
Arndt, C., Leytem, A. B., Hristov, A. N., Zavala-Araiza, D., Cativiela, J. P., Conley, S., Daube, C., Faloona, I., and Herndon, S. C.: Short-term methane emissions from 2 dairy farms in California estimated by different measurement techniques and US Environmental Protection Agency inventory methodology: A case study, J. Dairy Sci., 101, 11461–11479, https://doi.org/10.3168/jds.2017-13881, 2018. 
Bandy, A., Faloona, I. C., Blomquist, B. W., Huebert, B. J., Clarke, A. D., Howell, S. G., Mauldin, R. L., Cantrell, C. A., Hudson, J. G., Heikes, B. G., Merrill, J. T., Wang, Y. H., O'Sullivan, D. W., Nadler, W., and Davis, D. D.: Pacific Atmospheric Sulfur Experiment (PASE): dynamics and chemistry of the south Pacific tropical trade wind regime, J. Atmos. Chem., 68, 5–25, https://doi.org/10.1007/s10874-012-9215-8, 2011. 
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We flew a small single-engine instrumented aircraft in a large valley of California to study the factors that determine air pollutant levels in a region of the US that faces serious air quality challenges. After carefully accounting for atmospheric mixing, we found that agriculture is likely a significant and currently underestimated source of nitrogen oxide, a precursor to both ozone and particulate matter pollution and methane, a potent greenhouse gas.
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