A lesson on air pollution

The air we breathe in many U.S. cities is being polluted by activities such as driving cars and trucks; burning coal, oil, and other fossil fuels; and manufacturing chemicals. Air pollution can even come from smaller, everyday activities such as dry cleaning, filling your car with gas, and degreasing and painting operations. These activities add gases and particles to the air we breathe.

When these gases and particles accumulate in the air in high enough concentrations, they can harm us and our environment.

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