How will good air quality be ensured?

The National Ambient Air Quality Guideline Values, in order to protect health, safety, and the general welfare, have been set in law. These are to be routinely reviewed by the DENR, through the EMB, in coordination with other concerned agencies and sectors. 

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Lifted from:

Department of Environment and Natural Resources. (2003, August). Primer on the Clean Air Act. Diliman: DENR-Public Affairs Office.