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Around the world, another important factor is the automobile exhaust air pollution. Automobile exhaust contains carbon monoxide, oxygen, nitrogen and other adverse impact on the human body solid particles, especially leaded gasoline, more harmful to human body. Lead went into a state of particles in the exhaust gas, spread in the wind. Rural residents, general inhaled the amount of lead in the body from the air around for a micrograms per day; Urban residents, especially the residents will be considerably more than rural residents on both sides of the street. Tin enters the body, after the main distribution in liver, kidney, spleen, bravery, the brain, with the highest concentration of liver and kidney. After a few weeks, skeletons, lead by the above organizations to bone deposited in the form of insoluble phosphate lead. About 90% ~ 90% of lead accumulation in the human body in the bones, only a small amount of lead deposit lies in the liver, spleen and other organs. Bone lead in general, the more stable when the calcium in food, trauma, or infection, alcohol, acid alkali drugs and destroyed the acid-base balance, lead was transferred to the blood of the bone, cause the symptoms of lead poisoning. Lead poisoning symptom is very broad, such as dizziness, headache, insomnia, much dream, memory loss, fatigue, loss of appetite, abdominal distension full, warm air, nausea, diarrhea, constipation, anemia, peripheral neuritis, etc. Severe poisoning have significant liver damage, there will be yellow jaundice, hepatomegaly, abnormal liver function and other symptoms. In the city of Los Angeles, California, 1943, 2.5 million cars a day burns 1100 tons of gasoline. Gas after combustion of hydrocarbons, such as in the sun's ultraviolet light irradiation, biochemical reaction form the light blue smoke, most of the city residents have envy, and headaches. Later, people called this pollution photochemical smog. In 1955 and 1970, Los Angeles and photochemical smog happened twice, the former has more than 400 people died of facial features poisoning, breathing failure, which make the three-quarters of the people in the city. This is historically known as "the world's eight major public hazard" and "one of the ten major environmental hazards in the 20th century" Los Angeles photochemical smog event. It is these events make people deeply realize the dangers of the automobile exhaust.

In order to improve the urban air quality, the United States has designed strictly to reduce car pollution. In 1996, the European Union and developed according to say than the United States also of automobile tail gas discharge plans to the letter. The eu plan, put forward the standard to improve the quality of gasoline and diesel, request cancel leaded gasoline, 2000 years ago in Athens, London polluted areas, such as the use of special fuel. At the same time, new things, to launch vehicles, must be technical renovation, to purify the automobile exhaust. According to the survey, 10% of British children at the age of 6 The former lead poisoning. Children lead poisoning, IQ will reduce, there will be trouble and negligence.

In order to improve the quality of atmosphere, polluting enterprises is prohibited in many cities in our country city; The original enterprise technical renovation, reduce the waste gas, soot emissions, central heating. Reduce heating stove soot emissions, improve the quality of diesel oil, petrol, reduce the content of drill, actively to make the transition to unleaded gasoline, install car purifier, and so on.