SUB-PROBLEMS INCLUDING LEADING TO IMPAIRMENT AND BEST PRACTICES FOR AMBIENT AIR QUALITY
The discussion about the criteria pollutants will emphasize the pollutants more than the sources, because the pollutants come from a large number of sources and therefore the Best Practices are more general in nature. The discussion about the toxic air pollutants will be related to the source, because specific industries can use more specific Best Practices. The discussion on greenhouse gases will be more general in nature but will include Best Practices.
Particulate pollution and ground-level ozone, among the six criteria pollutants today in the United States, are the greatest contributors to impaired health. The level of these pollutants helps determine whether an area is in “attainment” or “non-attainment.”
In a given geographic area where the air quality is better than the primary standards, it is called an attainment area. Where this is not so, it is called a non-attainment area.