California US Rank Clean Cities

Top Cleanest U.S. Cities for Year-Round Particle Pollution (Annual PM2.5)
8 Salinas, CA
9 Redding-Red Bluff, CA

1. This list represents cities with the lowest levels of year-round PM2.5 air pollution.
2. Cities are ranked by using the highest design value for any county within that metropolitan area.
3. The Design Value is the calculated concentration of a pollutant based on the form of the Annual PM2.5 National Ambient Air Quality Standard, and is used by EPA to determine whether the air quality in a county meets the current (2012) standard (U.S. EPA).

30 Cleanest U.S. Cities for Ozone Air Pollution
Salinas is only city in California to make the list

Top 25 Cleanest Counties for Year-Round Particle Pollution (Annual PM2.5) 2016

#2 Lake
#14 San Benito

Cleanest Counties  for Short-Term Particle Pollution (24-hour PM2.5)

Humboldt CA
Lake CA
Mendocino CA
Monterey CA Salinas, CA
San Benito CA San Jose–San Francisco–Oakland, CA
Santa Barbara CA Santa Maria–Santa Barbara, CA
Shasta CA Redding–Red Bluff, CA
Sonoma CA San Jose–San Francisco–Oakland, CA
Yolo CA Sacramento–Roseville, CA

Cleanest Counties for Ozone Pollution

Colusa CA
Humboldt CA
Marin CA San Jose-San Francisco-Oakland, CA
Mendocino CA
Monterey CA Salinas, CA
San Francisco CA San Jose-San Francisco-Oakland, CA
Sonoma CA San Jose-San Francisco-Oakland, CA