[Air pollution in Los Angeles] World Health Organization. The heavily travelled freeway system of Los Angeles. Verso: WHO/4939-5446. USA. Air Pollution. The poison we breathe: The warming sight of a wisp of smoke curling upward from a house-top and the spectecale of the mushrooming cloud blasted into the sky by an atom bomb are but the facets of a problem as old as creation. The pollution of the atmosphere did not begin with man, but man's search for comfort and progress has so charged the air he breathes that it has become a major economic and social problem of concern to public health authorities the world over. The notorious Los Angeles smog occur on about 60 days a year and is caused not so much by smoke and fog as by the exhaust gasses of three million automobiles burning five million gallons of gasoline daily. Still image 1 photoprint. nlm:nlmuid-101437364-img 101437364 http://resource.nlm.nih.gov/101437364 IHM: A014114 English French This item may be under copyright protection; contact the copyright owner for permission before re-use. Copyright status: World Health Organization; World Health Organization website