The Sac Metro Air District is responsible for developing plans and programs to attain state and federal air quality standards. More information on these plans and programs can be found by clicking here.
Current Federal and State Standards
The EPA has established National Ambient Air Quality Standards (NAAQS) for six common pollutants (referred to as criteria pollutants), which are known to be harmful to human health and the environment. These pollutants are:
For several of these pollutants, California has also set standards, which are more stringent than federal standards. In the table below, links have been established to find out more information for each pollutant, planning boundary maps and designations. Locations of air monitoring stations can be found on the Air Monitoring page.
1 Summary of Historical Designations for State air quality Standards can be found here. A list of pollutants for which California Ambient Air Quality Standards were established and more information on the health and environmental effects specific to each pollutant can be found here.
2 EPA issued Determination of Attainment on 05/10/2017 (82 FR 21711) but the Sacramento Federal PM2.5 Nonattainment Area has not yet been redesignated to Attainment.
3 EPA is currently processing Air Districts' reclassification request from Serious to Severe-15.
4 In 04/2005, the
California Air Resources Board (CARB) approved a new 8-hour standard of 70 ppb and retained the 1-hour standard of 90 ppb.
5 EPA issued Determination of Attainment on 10/18/2012 (77 FR 64036) but the Sacramento Federal Ozone Nonattainment Area has not yet been redesignated to Attainment.
6 The original NAAQS was established in 1971. EPA reviewed both the 1-hour and 8-hour standards and decided to retain these standards in 2011.
7 Attainment /Unclassifiable designation was made as part of
EPA's Air Quality Designations for the 2010 Sulfur Dioxide (SO2) Primary NAAQS - Round 3 designation in 12/2017.
8 EPA designates areas as "unclassifiable/attainment" if they met the standard or are expected to meet the standard despite a lack of monitoring data.
9 The original NAAQS were established in 1971. EPA reviewed and decided to retain the annual arithmetic mean standard in 2010.
10 The statewide standard, the extinction of 0.23 per km, is equivalent to the standard adopted by CARB in 1969, defined as particles "in sufficient amount to reduce the visibility to less than ten miles when the relative humidity is less than 70 percent.
11 The Lake Tahoe Air Basin standard, the extinction of 0.07 per kilometer, is equivalent to the standard adopted by CARB in 1976, defined as particles "in sufficient amount to reduce the prevailing visibility to less than 30 miles when relative humidity is less than 70 percent.