Statewide PM 2.5 Measures
Percentage of population living in counties with PM2.5 levels greater than the annual standard (12 ug/m3), less than the annual standard, and with no monitor, California, 2000-2012
|Year||Number of counties with monitors||Number of counties without monitors||Percentage of population living in a county greater than the standard||Percentage of population living in a county less than the standard||Percentage of population living in a county with no monitor|
- Data Source: California Air Resources Board
- California has a total of 58 counties
- The "Standard" refers to the U.S. EPA National Ambient Air Quality Standard for PM2.5. Attainment of the standard is calculated on an annualized basis.
- PM2.5 (particulate matter with a diameter of less than 2.5 microns) is a Criteria Air Pollutant commonly found in diesal exhaust.
- Exposure to PM25 has been associated with asthma attacks and reduces lung function.
- This measure examines California's progress toward meeting the U.S. standard for all residents.