NO2 fluxes from Tijuana using a mobile mini-DOAS during Cal-Mex 2010

► Average NO2 flux from the Tijuana urban area was 328 ± 184 g s−1. ► Average NO2 flux from the Rosarito power plant was 23.4 ± 4.9 g s−1. ► Rosarito power plant flux has a minor contribution of NO2 in regional air quality. ► Less variability of NO2 fluxes was found when using modeled winds. ► Comparison of measured and simulated distribution of plumes had good agreement.