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The Clean Air Act identifies six common air pollutants that are found all over the United States and can injure health, harm the environment or cause property damage. These pollutants include:
The United States Environmental Protection Agency (EPA) has established National Ambient Air Quality Standards (NAAQS) for each of these pollutants. If the air quality in a geographic area meets the NAAQS, it is called an attainment area; areas that do not meet the NAAQS are called nonattainment areas and must develop comprehensive state plans to reduce pollutant concentrations to a safe level.
In the 1990's, Davis, Salt Lake, and Utah Counties failed to attain the NAAQS for ozone, particles, carbon monoxide, and sulfur dioxide. However, Salt Lake and Davis Counties were officially redesignated to attainment status for ozone by EPA in 1997; Salt Lake, Ogden, and Provo Cities were redesignated to attainment for carbon monoxide in 1999, 2001,and 2006 respectively. Requests to redesignate Salt Lake County and part of Tooele County to attainment for sulfur dioxide, and to redesignate Salt Lake and Utah Counties and Ogden City to attainment for PM10 were submitted to EPA in 2005.
On September 21, 2006, EPA issued revisions to the NAAQS for particle pollution. EPA strengthened the 24-hour PM2.5 standard from the 1997 level of 65 µg/m3 to 35 µg/m3, and retaining the current annual fine particle standard at 15 µg/m3. Click here to see "Utah’s Area Designation Recommendation for the 2006 PM2.5 NAAQS."
Air monitoring stations collect representative data that indicates how much of a pollutant is in the air. Currently, 24 air-monitoring stations are strategically located across the Wasatch Front and in Southwestern Utah.
(103 kb) to display a map with the nonattainment areas and the corresponding pollutant.We have developed trend plots for ozone (8 hr averaging time), carbon monoxide ( 8-hr averaging time), particulate matter (PM10, 24-hr averaging time, and PM2.5, 24-hr averaging time), and sulfur dioxide ( 3-hr averaging time).
Air pollution concentrations are a function of meteorology and emissions. While meteorology cannot be controlled, the emissions inventory can be controlled and is the focus of air quality control strategies for automobiles and industrial facilities.