Los Angeles Times-
Southern Californians might remember the summer of 2018 for its sweltering heat waves, record ocean temperatures and destructive wildfires. But it also claimed another distinction: the summer we went nearly three months without a day of clean air.
The region violated federal smog standards for 87 consecutive days, the longest stretch of bad air in at least 20 years, state monitoring data show. The streak is the latest sign that Southern California’s battle against smog is faltering after decades of dramatic improvement.