Thursday, Sep. 29, 2011
8. Hanford-Corcoran, Calif.
Really, you could make all of Southern California one big bad air zone, but this metropolitan space does manage to stand out. The Hanford-Corcoran area, in the southern San Joaquin Valley, has major air-pollution problems, with industry and traffic congestion amplified by high temperatures. It doesn't help that even if Hanford reduces its own pollution, it will still get particulates drifting over from its neighbors.