Since the creation of the Clean Air Act in 1970, there has been a large effort to clean up the air in the US. How much progress have we made and how much work do we still have to do?
from Forbes Real Time https://www.forbes.com/sites/kevinanderton/2018/04/22/48-years-of-earth-day-has-changed-the-air-we-breath-infographic/
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