Thanks to early projection models, climate scientists have long suspected that electric vehicles lead to an undeniable reduction in air pollution. But a new study from the Lancet Planetary Health journal used satellites to measure just how big that impact is.
From 2019 to 2023, a national team of scientists measured nitrogen levels across nearly 1,700 ZIP codes in California, the state with the highest rates of EV use in the country. They found that for every increase of 200 electric vehicles, nitrogen dioxide emissions decreased by 1.1%.
Sandrah Eckel, a public health professor at the University of Southern California’s Keck School of Medicine and lead author of the study, said the results were “remarkable.”
“We’re not even fully there in terms of electrifying, but our research shows that California’s transition to electric vehicles is already making measurable differences in the air we breathe,” Eckel said in a university press release.
“These findings show that cleaner air isn’t just a theory — it’s already happening in communities across California,” she added.
Eckel and her peers said that their “revolutionary approach” to studying emissions could be replicated anywhere in the world, inviting other researchers to take part.
“Satellite-measured NO2 could be used across the globe to assess changes in NO2 from ongoing climate mitigation efforts to reduce fossil-fuel combustion, with these data informing policy decisions to protect public health today and in the future,” the authors noted.
A version of this article originally appeared in the 2026 Environment Edition of the Goodnewspaper
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