Smog declined in Southern California over the last year.
That’s according to the South Coast Air Quality District, which said we had 10 fewer high ozone days during 2015’s peak smog season than the previous year. Ozone is the primary gas in smog and can damage lungs.
In total, there were only 82 days when smog levels exceeded federal standards for clean air. That may sound bad, but it’s better than in 2014 when there were 92 such days. Click here for the SCPR article.