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We leverage the unparalleled changes in human activity during COVID-19 and the unmatched capabilities of the TROPOspheric Monitoring Instrument to understand how lockdowns impact ambient nitrogen dioxide (N

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    Despite the decreases in NO2, pollution during lockdowns, racial, ethnic, and socioeconomic NO2 disparities persisted, and marginalized communities continued to face higher levels of NO2 during the lockdowns than non-marginalized communities experienced prior to the pandemic. As passenger vehicles represent an enormous source of urban NO2 emissions, the proximity of marginalized neighborhoods to a high density of major roadways is likely the key determinant in explaining lockdown-related drops in NO2.