Show Air Pollution Is Not New Concern over air pollution extends considerably farther into history than the last or even the The first piece of legislation relating lo air pollution control was passed in 1273 in London because of a smoke pollution problem caused by extensive coal DEVICES to control automobile emissions have been in use longer than you might Auto manufacturers began researching the problem as far back as The first device actually used was the Positive Crank-case Ventilation System installed on California cars in and on all cars in two years before the first Federal legislation Federal Clean Air Act requiring exhaust controls on 1968 model THE system reduced by 80 percent the hydrocarbon emissions from the This system was modified in 1968 so that fresh air was circulated through the engine crankcase and then drawn into the intake manifold carrying with it the crankcase As a percent of the crankcase emissions were AUTO emission control technology has produced sophisticated equipment such as the electric assist chokes which very the rate of choke opening according to the ambient air air pump systems by which fresh air is pumped into the exhaust system to ignite and burn unburned exhaust and exhaust gas systems which dilute the intake mixture of gasoline and air with a metered amount of exhaust gas to reduce emissions from unburned gasoline produced by a 1962 model car are about seven times higher than the same emissions produced by a comparable 1973 and the car manufacturers are working to reduce emission levels even more to meet current government THIS 17 out of 20 cars on the road are equipped with some form of emission control When model cars have been phased out of all cars will have some anti-pollution |