non-attainment area for PM2.5

I have found this: The annual standard for PM2.5 is met whenever the 3 year average of the annual mean PM2.5 concentrations for designated monitoring sites in an area is less than or equal to 15.0 µg/m3. The 24 hour standard for PM2.5 is met whenever the 3 year average of the annual 98th percentile of values at designated monitoring sites in an area is less than or equal to 35 µg/m3. In addition to air quality data, EPA guidance on the PM2.5 designations process also discusses other important factors, including emissions of pollutants that lead to PM2.5 formation, population, commuting patterns, and expected growth, that states should evaluate in order to determine whether a county is a likely contributor to the area’s air quality problem. http://www3.epa.gov/airquality/particlepollution/designations/faq.htm#4