Cities including Fairfield, San Rafael, San Francisco and Oakland were awash in purple, the color the Bay Area Air Quality Management District has chosen for "unhealthy air." Click here to check the air quality data where … Smoke from wildfires is causing bad air and falling ash in some parts of Southern California. Blazes in Oregon and California are also pumping thick smoke and ash into the air, causing poor, and in some areas, hazardous air quality. Track air pollution now to help plan your day and make healthier lifestyle decisions. Localized Air Quality Index and forecast for San Jose, CA. SAN FRANCISCO (KGO) -- California is dealing with some of the worst air quality on the planet as the Bay Area continues its record-breaking Spare the Air streak with smoke from wildfires … On Wednesday, “we had almost darkness at noon, but the air quality wasn’t bad for most people,” said Ralph Borrmann, a spokesman for the Bay Area Air Quality Management District. NYC Is Among Smoggiest Cities In Nation, Report Says - New York City, NY - While the city ranks well for particle pollution, its ozone levels are bad. The worst official air readings by the Bay Area Air Quality Management District through noon showed the worst air … California’s Bay Area—San Francisco, Oakland, and San Jose—doesn’t usually show up on this list, but this year it landed in fourth place, likely due to wildfires in the area. The average daily PM2.5 Air Quality Index in San Jose for June and July was 34.4, almost exactly the same as measurements made at the U.S. Consulate in Shanghai, where the average was 35.0. The Air Quality Index is the yardstick the Environmental Protection Agency uses for reporting air quality. The Bay Area Air Quality Management District advised Tuesday that with hot weather through Wednesday, pollution in much of the region would be unhealthy … Air quality officials have issued a wildfire smoke advisory for much of the region through … Levels ranging from 151 to 200 are considered unhealthy; from 201 to 300, very … But air quality problems persist.