Effectively protecting U.S. citizens from airborne pollution.

Outline which regulation(s) they rely upon for effectively protecting U.S. citizens from airborne pollution.
Determine which circumstances are most responsible for compromising their ability to protect us.
Explain which populations are most commonly impacted by airborne pollution and why.
Judge whether you think the national or international agency researched is effective.
Conclude what air quality enforcement agencies should do to maintain the safety of air quality as global warming increases.