Close California cities among top in air pollution in U.S. California leads the nation with 6 of the top 10 most polluted U.S. cities, according to the American Lung Association's annual "State of the Air" report. KXTV 11:18 PM. PDT April 19, 2017 TRENDING VIDEOS High school football game canceled due to safety concerns Woman arrested of attempting to break into Rocklin home How has Natomas development changed with 'vacant' Sleep Train Arena? Best of Elk Grove competition shutdown after accusations, threats of legal action Teen returns wallet he found with $1,500 in cash Snowfall at Sugar Bowl Woodland High School to finally get new football stadium? Are sex traffickers prevalent in suburban neighborhoods? Land Park residents create Facebook group to bring homelessness to light Bill hopes to add course on domestic violence awareness in hair and beauty school More Stories McCain says he won't vote for Graham-Cassidy health… Sep 22, 2017, 10:59 a.m. High school football game between Sac High, Kennedy… Sep 21, 2017, 4:53 p.m. Farm-to-Fork: Growing an identity Sep 17, 2017, 5:38 p.m.