primarily conducted using column NO2 instead of surface NO2 to diagnose NOx emissions since vertical mixing can be a source of error in a surface-only comparison. With finer spatial resolution and more numerous NO2 measurements now available from TEMPO starting in August 2023, it is feasible that a similar analysis could be conducted using satellite data. This project provides actionable information to policymakers looking to understand where there are further opportunities to reduce NOx emissions and improve ozone and PM2.5 air quality in metropolitan areas.