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Latest Findings on National Air Quality -
Status and Trends through 2006 -
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| Figure | Description |
|---|---|
| Highlights | |
| Number of people living in counties with air quality concentrations above the level of the primary National Ambient Air Quality Standards (NAAQS) in 2006. | |
| Air Pollution Pathways | |
| Six Principal Pollutants | |
| Fig 1 | Comparison of national levels of the six principal pollutants to national ambient air quality standards, 1980-2006. |
| EPA’s Air Quality Index (AQI) | |
| Fig 2 | Number of days reaching Unhealthy for Sensitive Groups on the Air Quality Index for five of the six principal pollutants for 2001-2005 (average) vs. 2006. |
| Fig 3 | Status of original nonattainment areas for one or more standards (i.e., ozone, annual PM2.5, PM10, NO2, CO, SO2, and lead) as of 2006. |
| Fig 4 | Comparison of national annual emissions, 1980 vs. 2006. |
| Fig 5 | Comparison of growth measures and emissions, 1980-2006. |
| New National Monitoring Network. Location of candidate NCore sites. | |
| Ground-Level Ozone | |
| Fig 6 | National 8-hour ozone air quality trend, 1990-2006 (average of annual fourth highest daily maximum 8 ‑ hour concentrations). |
| Fig 7 | Change in ozone concentrations in ppm, 1990-1992 vs. 2004-2006 (3-year average of annual fourth highest daily maximum 8-hour concentrations). |
| Fig 8 | Ozone concentrations in ppm, 2006 (fourth highest daily maximum 8-hour concentrations). |
| Fig 9 | Number of days reaching Unhealthy for Sensitive Groups for ozone on the AQI for 2001-2005 (average) vs. 2006. |
| Fig 10a Fig 10b |
National trends in summertime ozone-forming emissions, 1997-2006. |
| Fig 11 | Trends in average summertime daily maximum 8-hour ozone concentrations, before and after adjusting for weather, and the location of urban and rural monitoring sites used in the average. |
| Fig 12 | Changes in summertime daily maximum 8-hour ozone concentrations (ppm) between 2000-2001 (average) and 2005-2006 (average). |
| Where You Live. Local trends in ozone levels. | |
| Particle Pollution | |
| Fig 13 | National PM2.5 air quality trend, 2000-2006 (annual average). |
| Fig 14 | Change in PM2.5 concentrations in µg/m3, 2000 vs. 2006 (annual average). |
| Fig 15a Fig 15b |
Annual average and daily (98th percentile 24-hour concentrations) PM2.5 concentrations in µg/m3, 2006. |
| Fig 16 | Number of days reaching Unhealthy for Sensitive Groups for PM2.5 on the AQI for 2001-2005 (average) vs. 2006. |
| Fig 17 | National trends in annual direct PM2.5 and PM2.5 - forming emissions, 2000-2006. |
| Fig 18 | Trends in annual average PM2.5 concentrations, before and after adjusting for weather, and the location of urban monitoring sites used in the average. |
| Seasonal Influences on PM2.5. Change in warm (April-September) and cool season (October-March) PM2.5 concentrations in µg/m3 after removing the influence of weather, 2000-2001 (average) vs. 2005-2006 (average). | |
| Fig 19 | Regional trends in annual PM2.5 composition in µg/m3, 2002-2006. |
| Fig 20 | National PM10 air quality trend, 1990-2006 (second maximum 24-hour concentration). |
| Fig 21 | PM10 concentrations in µg/m3, 2006 (second maximum 24-hour concentration). |
| Fig 22 | National trends in direct PM10 emissions, 1990-2006. |
| Nitrogen Dioxide | |
| Fig 23 | National NO2 air quality trend, 1990-2006 (annual average). |
| Fig 24 | National trends in annual NOx emissions, 1990-2006. |
| Carbon Monoxide | |
| Fig 25 | National CO air quality trend, 1990-2006 (second maximum 8-hour average). |
| Fig 26 | National trends in annual CO emissions, 1990-2006. |
| Sulfur Dioxide | |
| Fig 27 | National SO2 air quality trend, 1990-2006 (annual average). |
| Fig 28 | National trends in annual SO2 emissions, 1990-2006. |
| Lead | |
| Fig 29 | National lead air quality trend, 1990-2006 (maximum quarterly average). |
| New Information on Lead Sources | |
| Toxic Air Pollutants | |
| Fig 30 | Air toxics monitoring sites operating in 2005 (by monitoring program). |
| Fig 31 | Percent contribution by source sector to national air toxics emissions, 2002. |
| Fig 32 | Trends in national air toxics emissions for 1990-1993 vs. 2002. |
| Fig 33 | National benzene air quality trend, 2000-2005 (annual average). |
| Fig 34 | Trends in annual average benzene concentrations at individual sites for any period of at least five years within 1990-2005. |
| Fig 35 | Estimated county-level cancer risk from the 1999 National Air Toxics Assessment (NATA99). |
| Acid Rain | |
| Fig 36a Fig 36b |
Three-year average precipitation of sulfate concentrations (SO4) in 1989-1991 and 2004-2006. |
| Visibility in Scenic Areas | |
| Visibility at Grand Canyon National Park | |
| Fig 37a Fig 37b |
Trends in visibility (haze index in deciviews) on the 20 percent best and worst visibility days, 1996-2005. |
| Climate Change | |
| Fig 38 | Domestic greenhouse gas emissions in teragrams of carbon dioxide equivalents (Tg CO2 eq), 1990-2005. |
| Fig 39 | Predicted increases in summertime daily maximum 8-hour ozone concentrations between the 1990s and 2050s. |
| International Transport of Air Pollution | |
