Why was 1990 an important year regarding air quality?
What was the order of steps taken by the United States to clean the air?
A community takes action to reduce chemical release at an industrial plant located near a town.Why is it important for the community to take action?
What was the main reason for creating the EPA?
Which health issue is associated with exposure to indoor air pollution?
What is the most effective approach the government can take to keep the air clean?
Study the image of a plant.

What happens when the atmosphere interacts with the biosphere?
Which factor is a major contributor to outdoor air pollution?
What are one of the ways the atmosphere recycle gases through interactions with the biosphere ?
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