Total PM10 Estimated Exceedances in Arizona by County
PM10 violations have been a consistent problem in Maricopa, Pinal, and Santa Cruz Counties. However, in 2006, the number of PM10 violations in Pinal County shot up dramatically. The number has been decreasing since then, as measures continue to be taken to control the problem. Many of these violations occur in the cities of Maricopa and Casa Grande and may be due to increased development as well as agricultural and feedlot sources. The causes of PM10 pollution in various counties, along with nonattainment area and attainment area maintenance plans, can be seen at [http://www.azdeq.gov/environ/air/plan/notmeet.html].
Readers are cautioned not to rank order geographic areas based on AirData reports. Air pollution levels measured at a particular monitoring site are not necessarily representative of the air quality for an entire county or urban area.