Abstract
<strong class="journal-contentHeaderColor">Abstract.</strong> Nitrogen oxides (NO<sub><em>x</em></sub> ≡ NO + NO<sub>2</sub>) are involved in most atmospheric photochemistry, including the formation of tropospheric ozone (O<sub>3</sub>). While various methods exist to accurately measure NO<sub><em>x</em></sub> concentrations, it is still a challenge to quantify the source and flux of NO<sub><em>x</em></sub> emissions. We present airborne measurements of NO<sub><em>x</em></sub> and winds used to infer the emission of NO<sub><em>x</em></sub> across Los Angeles. The measurements were obtained during the research aircraft campaign RECAP-CA (Re-Evaluating the Chemistry of Air Pollutants in CAlifornia) in June 2021. Geographic allocations of the fluxes are compared to the NO<sub><em>x</em></sub> emission inventory from the California Air Resources Board (CARB). We find that the NO<sub><em>x</em></sub> fluxes have a pronounced weekend effect and are highest in the Eastern part of the San Bernardino valley. The comparison of the RECAP-CA and the modeled CARB NO<sub><em>x</em></sub> fluxes suggest the modeled emissions are too high near the coast and in downtown Los Angeles and too low further inland in the Eastern part of the San Bernardino valley.
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