Since 1997, nitrogen oxides have decreased 70% in the air basin ... plan to achieve federal smog standards. This story originally appeared in Los Angeles Times.

Also, something in the Los Angeles smog was destroying rubber tires and damaging crops ... Although we have made great progress during the past 70 years at reducing pollutants in the air, ground-level ...

Santa Ana winds will hit the Los Angeles area yet again this week, bringing extreme risk of rapid fire spread as the region ...