discuss how the concentration of your chosen parameter has changed from 1970 to the present.

f. For a NAAQS parameter of your choice and a city in the United States of your choice, discuss how the concentration of your chosen parameter has changed from 1970 to the present. Do you think the Clean Air Act has had an influence on the trend? To help you get started, consider performing an Internet search on “Columbus, Ohio air quality 1970 to present” and substitute the city of your choice

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