America's Best and Worst Cities for Air Quality: Which California Communities Made the List?

As wildfires intensify and smog persists, a new study highlights just how severe California’s air pollution problem has become. According to air purifier review site HouseFresh, the state is now home to 9 out of the 10 worst cities for air quality in America. On the other hand, 5 of the 10 best cities for air quality are also in the Golden State. 

The researchers measured average concentrations of PM2.5 (fine particulate pollution) across America. For each city, HouseFresh assigned a cigarette equivalent.

These are the 10 best and worst cities in the country for air quality, according to the study: 

Read the full report here.  

List and data were compiled by HouseFresh and may not reflect statistics on all cities.