Yes, individual communities should determine the air quality standards for their areas because each area would have a different standard. For example the Newark area air quality standard would be much lower then the other tri-state areas of New Jersey. If Newark's air quality was measured with standards that are kept for the whole state then the results would be much lower and wouldn't be right to compare the two. Having different standards per each area helps in diffrentiating between each one.
Yes and no. Communities should be able to do something about their air quality in their area but within the state's command. For example, states should have a state regulation on air quality and be able to enforce that regulation. However, individual communities should be able to do what they want to meet that state regulation on air quality. With this, communities still have the freedom to do something about their air quality while the state maintains its power