资源环境科技发展态势分析平台

Governments restricted mobility and effectively shuttered much of the global economy in response to the COVID‐19 pandemic. Six San Francisco Bay Area counties were the first region in the United States to issue a ``shelter‐in‐place” order asking non‐essential workers to stay home. Here we use CO₂ observations from 35 Berkeley Environment, Air‐quality and CO₂ Network (BEACO₂N) nodes and an atmospheric transport model to quantify changes in urban CO₂ emissions due to the order. We infer hourly emissions at 900‐m spatial resolution for 6 weeks before and 6 weeks during the order. We observe a 30% decrease in anthropogenic CO₂ emissions during the order and show this decrease is primarily due to changes in traffic (‐48%) with pronounced changes to daily and weekly cycles; non‐traffic emissions show small changes (‐8%). These findings provide a glimpse into a future with reduced CO₂ emissions through electrification of vehicles.