Conduct research on the Internet on the past and current status of air pollution in the U.S. In your research, consider the years before the U. S. Environmental Protection Agency in order to learn what conditions were like at that time. Research the current situation to gain a firm understanding of how things have changed.

3. Describe some of the methods or instruments used to measure pollutants and how they function.

4. Does weather impact measurements of pollutants Explain and justify your claims.

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