| Air Quality Standards: |
In outdoor air, the air quality standars are set for the emissions of an outdoor environment and monitored by the local Air Quality Management District (AQMD). In indoor air the air quality standards and guidelines are set and monitored by the Environmental Protection Agency (EPA). In the united States, there are 247 air quality control regions that manage outside air. each region contains at least two urban areas that share actual or potential air quality problems. |