Los Angeles suffers worst smog in almost 30 years.

Lung-damaging ozone pollution in Los Angeles reached its highest levels in a generation and set records in other parts of Southern California during the blistering Labor Day weekend heat wave, air quality readings show.
Ozone pollution spiked to 185 parts per billion in downtown Los Angeles at midday Sunday, according to South Coast Air Quality Management District monitoring data. It was the highest hourly reading in Southern California since 2003 and the highest in downtown L.A. in 26 years. Sunday’s readings at the downtown L.A. air monitoring station, located on North Main Street in Chinatown, were so far above normal that they triggered a quality control check designed to prevent the release of erroneous data, air quality officials said.