Motorists drive along Highway 99 as seen from East Childs Avenue in Merced, Calif., Tuesday, July 26, 2016. According to the San Joaquin Valley Air Pollution Control District, May to September is when levels of ozone pollution spike.
Motorists drive along Highway 99 as seen from East Childs Avenue in Merced, Calif., Tuesday, July 26, 2016. According to the San Joaquin Valley Air Pollution Control District, May to September is when levels of ozone pollution spike. Andrew Kuhn akuhn@mercedsun-star.com
Motorists drive along Highway 99 as seen from East Childs Avenue in Merced, Calif., Tuesday, July 26, 2016. According to the San Joaquin Valley Air Pollution Control District, May to September is when levels of ozone pollution spike. Andrew Kuhn akuhn@mercedsun-star.com

Warmer weather means higher rates of ozone pollution in Central Valley

May 14, 2017 04:49 PM