San Diego’s ozone pollution is among the worst in the U.S., making it one of the smoggiest areas in the country, according to a new report from the American Lung Association.
Why it matters: Air pollution threatens everyone’s health — especially children, older people and those with asthma or heart and lung conditions.
Zoom in: San Diego-Chula Vista-Carlsbad region ranked No. 8 among the 25 U.S. metro areas most polluted by ozone, per the ALA’s 2025 State of the Air report.
- The area, which covers the county, received an “F” grade for the number of days with high ozone and a failing grade for year-round particle pollution.
Yes, but: San Diego’s air quality is improving by some measures, dropping off the 2025 list of the 25 most polluted U.S. cities for daily particle pollution…