Every year this report comes out and every year I say....it's still better than living in Cleveland
The analysis draws data from three years (2015 to 2017), gathering average ozone levels from that time period. In that period, LA County averaged 119 days per year during which ozone, or smog, was at unhealthy levels. In last year’s report, the county averaged 111 unhealthy days.
Air quality was actually worse in San Bernardino and Riverside counties, which are lumped in with Los Angeles for the study’s city rankings. Those counties averaged 161 and 130 ozone days, respectively.