A layer of bad air hugs the skyline of downtown Fresno in late July, 2013.
A layer of bad air hugs the skyline of downtown Fresno in late July, 2013. ERIC PAUL ZAMORA Fresno Bee Staff Photo
A layer of bad air hugs the skyline of downtown Fresno in late July, 2013. ERIC PAUL ZAMORA Fresno Bee Staff Photo

San Joaquin Valley achieves decades-old ozone standard

May 04, 2016 4:46 PM