University of California scientists have a new way to demonstrate which neighborhoods returned to pre-pandemic levels of air pollution after COVID restrictions ended. 

Vehicle emissions are the biggest source of carbon dioxide in Southern California’s air. As people drove their cars far less in 2020 compared to 2019 due to the pandemic, there was a major drop in CO2 on regional highways. A new study published in AGU Advances using a mobile laboratory shows the CO2 drop was roughly 60%. 

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