Coastal urban environments face unique challenges associated with air quality‐meteorology interactions. In this study, high resolution chemical transport modeling over the Greater Boston area was performed to improve our understanding of sea breezes impacts on the spatiotemporal variability of primary and secondary pollutants. We perform WRF‐Chem simulations at 3 km resolution over June 22 to 10 July 2019 (a period that included 10 sea breeze occurrences), and use Pandora tropospheric NO2 column, surface air quality monitoring, and vertical meteorological aircraft profiles for evaluation. The model generally reproduces observed spatiotemporal variability of air pollution during sea breezes well. Tropospheric columns of NO2 predicted by the model and observed by the Pandora instrument show that sea breezes are associated with rapid increases and steep gradients in tropospheric NO2 and confirm accumulation of local primary emissions. Spatial heterogeneity in tropospheric NO2 is strongly governed by inland penetration lengths of the sea breeze front. Process diagnostics show that three sea‐breeze days where O3 observations recorded hourly concentrations >70 ppb have both efficient net chemical O3 production in the boundary layer (>10 ppb/hr) and rapid O3 convergence in the near‐surface convergence zone (>20 ppb/hr). During sea breezes, interactions between photochemistry, the convergence zone inland penetration, and urban NOx titration effects, contribute to strong heterogeneity and high O3 inland that is not captured by the current monitoring network. We discuss monitoring needs and model applications for the sea breeze scenarios, with broad implications for air quality monitoring in coastal urban environments.

BrNO 2) couple with chlorine and iodine catalytic cycles to alter the tropospheric oxidative capacity (Saiz-Lopez & von Glasow, 2012; Simpson et al., 2015). Furthermore, tropospheric bromine has been associated with the near-complete removal of surface ozone in the polar spring, referred to as ozone depletion events (Barrie et al., 1988). The sources and distribution of Br y in the troposphere are an area of active research. Bromine monoxide (BrO) is the most frequently observed Br y compound, and satellite measurements of BrO are a valuable resource for monitoring global bromine due to the extensive spatial and temporal coverage of the data (e.g.,