biostudies-literatureEckel SPNational Institute of Environmental Health SciencesNASANIEHS NIH HHSNational Institutes of Health101379https://www.ebi.ac.uk/biostudies/studies/S-EPMC12928720biostudies-literatureUnknown10(1)<h4>Background</h4>Electrifying the transportation sector is a key climate-change mitigation strategy. Reductions in exhaust emissions have anticipated air quality co-benefits; yet, evidence is primarily based on projections. Using observed data in California, USA, we aimed to investigate whether reductions in exhaust emissions from the transition to zero-emissions vehicles (ZEVs: battery electric, plug-in hybrid, and hydrogen fuel cell) were detectable using Tropospheric Monitoring Instrument (TROPOMI) satellite measurements of nitrogen dioxide (NO₂) air pollution.<h4>Methods</h4>In this longitudinal observational study, we combined data from 2019 to 2023 on annual light-duty ZEV registrations in 1692 California ZIP code tabulation areas (ZCTAs; cross-walked from ZIP codes) witThe Lancet. Planetary healthZero-emissions vehicle adoption and satellite-measured NO&lt;sub&gt;2&lt;/sub&gt; air pollution in California, USA, from 2019 to 2023: a longitudinal observational study.PMC12928720R01ES035137P30ES00704880NSSC21K051180NSSC23K1002R01 ES035137P30 ES007048Silva SJGarcia EJohnston JFranco WEckel SPChen FGoldberg DLPalinkas LACampos AfalseZero-emissions vehicle adoption and satellite-measured NO&lt;sub&gt;2&lt;/sub&gt; air pollution in California, USA, from 2019 to 2023: a longitudinal observational study.<h4>Background</h4>Electrifying the transportation sector is a key climate-change mitigation strategy. Reductions in exhaust emissions have anticipated air quality co-benefits; yet, evidence is primarily based on projections. Using observed data in California, USA, we aimed to investigate whether reductions in exhaust emissions from the transition to zero-emissions vehicles (ZEVs: battery electric, plug-in hybrid, and hydrogen fuel cell) were detectable using Tropospheric Monitoring Instrument (TROPOMI) satellite measurements of nitrogen dioxide (NO₂) air pollution.<h4>Methods</h4>In this longitudinal observational study, we combined data from 2019 to 2023 on annual light-duty ZEV registrations in 1692 California ZIP code tabulation areas (ZCTAs; cross-walked from ZIP codes) wit2026-01-01T00:00:00Z2026 Jan2026-07-16T17:43:23.19Z2026-07-09T11:09:07.752ZS-EPMC129287204158151510.1016/j.lanplh.2025.101379