California’s air quality began deteriorating in the 1930s and 1940s. In 1943, L.A. experienced its first smog day, with visibility down to three feet in some areas. By 1947, L.A. County established its first air quality board to battle the deteriorating air situation. California air quality hit a low in the 1970s. This was due, in large part, to automobiles. Los Angeles has a lot of cars and many miles
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