Pollution in the United States is getting worse and worse by the day. Poor air quality is a serious issue and health risk in cities throughout the country. The main source of the pollution problem is our transportation. Cars produce roughly one half of the pollution in our cities, and about a quarter of the greenhouse gases. The internal combustion engine is the single largest source of air pollution in the United States. Toxic gases are emitted into the atmosphere as byproducts of the combustion process and also from evaporating gasoline. The main pollutants consist of ca
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