Drivers have always demanded safety and comfort, but now many drivers also want their cars to have minimal impact on the environment. Engineers have concentrated most of their environment-related technology in the heart of the car, the engine. We take a look inside the engine to see how cars are striving for greater harmony with nature.THE CONNECTION between air pollution and exhaust fumes from cars was first clearly understood about a half century ago. Photochemical smog became a problem in Los Angeles around 1950. It was discovered that carbon monoxide, hydrocarbons, nitric oxides and other chemicals in exhaust fumes were the fundamental cause of photochemical smog.
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