Transmission lines and railroad near Salton Sea. District of Los Angeles smog obscures the sun, May 1972

Imperial Valley, May 1972

Dry heat and high winds equal eye-stinging, nose itching dust storm, May 1972

Early morning at Malibu Lake in the Santa Monica Mountains near Malibu, California, which is located on the northwestern edge of Los Angeles County, May 1975

Farm workers shoulder tools at end of day near Ripley, in the fertile Palo Verde Valley of the lower Colorado River region, May 1972

Farm youngsters playing at sunset near their home in Ripley, May 1972

London Bridge, transplanted here in 1971, crosses arm of Havasu Lake, which is fed by Colorado River, May 1972

Pickers in field near El Centro, May 1972

Moving cattle raise dust along the highway--near Calipatria in the Imperial Valley, May 1972

near Calipatria in the Imperial Valley, southwest of Blythe, May 1972

Gypsum plant at Plaster City. White dust from the plant is part of the atmosphere, May 1972

02. A hundred-mile ribbon of sand dunes separates the Chocolate Mountains of southern California from the Imperial Valley, which stretches from the Salton Sea into Mexico, May 1972