The Impact of COVID-19 on CO2 Emissions in the Los Angeles and Washington DC/Baltimore Metropolitan Areas

Vineet Yadav, Subhomoy Ghosh, Kimberly Mueller, Anna Karion, Geoffrey Roest, Sharon M. Gourdji, Israel Lopez-Coto, Kevin R. Gurney, Nicholas Parazoo, Kristal R. Verhulst, Jooil Kim, Steve Prinzivalli, Clayton Fain, Thomas Nehrkorn, Marikate Mountain, Ralph F. Keeling, Ray F. Weiss, Riley Duren, Charles E. Miller, James Whetstone

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


Responses to COVID-19 have resulted in unintended reductions of city-scale carbon dioxide (CO2) emissions. Here, we detect and estimate decreases in CO2 emissions in Los Angeles and Washington DC/Baltimore during March and April 2020. We present three lines of evidence using methods that have increasing model dependency, including an inverse model to estimate relative emissions changes in 2020 compared to 2018 and 2019. The March decrease (25%) in Washington DC/Baltimore is largely supported by a drop in natural gas consumption associated with a warm spring whereas the decrease in April (33%) correlates with changes in gasoline fuel sales. In contrast, only a fraction of the March (17%) and April (34%) reduction in Los Angeles is explained by traffic declines. Methods and measurements used herein highlight the advantages of atmospheric CO2 observations for providing timely insights into rapidly changing emissions patterns that can empower cities to course-correct CO2 reduction activities efficiently.

Original languageEnglish (US)
Article numbere2021GL092744
JournalGeophysical Research Letters
Issue number11
StatePublished - Jun 16 2021
Externally publishedYes


  • COVID-19
  • Los Angeles
  • Washington DC
  • carbon dioxide
  • inversion
  • urban

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences


Dive into the research topics of 'The Impact of COVID-19 on CO2 Emissions in the Los Angeles and Washington DC/Baltimore Metropolitan Areas'. Together they form a unique fingerprint.

Cite this