San Diego region ranks 7th smoggiest in US, report finds
The San Diego-Chula Vista-Carlsbad region is the seventh-smoggiest area in the nation, with ozone pollution generally worsening in…
44% of Americans breathe dangerously polluted air. In California, it’s 82%
Greater Los Angeles remained the most ozone-polluted metro area in the nation, according to the American Lung Assn.’s…