Framework

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Christopher, 5, in bow, and Brandon Lisk, 14, paddle down 20th Street near Balboa Boulevard in...

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Sep. 13, 1955: Hot weather and low inversion layer leads to highest recorded ozone level in Los...

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Motorcycle messenger Frank Stone uses gas mask to make deliveries during smog attack.

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Dan Lemons, manager of Ranchita Oaks Ranch and Vineyards northeast of Paso Robles runs dirt...

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1937 dust storm.

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About 500 people prospect for gold in San Gabriel Canyon.

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Sera Segal-Alsberg, wears mask designed to filter out airborne particles during Los Angeles smog...

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Lightning over city skyline looking south from Elysian Park.

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After a 1917 U.S. Supreme Court decision, the Los Angeles Times campaigns against billboards in...

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Declining downtown Los Angeles pedestrian traffic is documented by similar photos at the corner...

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Southern Pacific freight train passes P.J.'s on Santa Monica Blvd. in West Hollywood on old...

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Chemical engineer Edward Liston, right, of Stanford Research Institute (SRI) checks on five...