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Air Trends

Our Nation's Air - Status and Trends through 2010 - Download Graphics

You will need Microsoft Excel to view the Excel spreadsheet files on this page. Microsoft offers a Free Excel Viewer exit EPA if you don't own Excel.

The table below contains links to graphics (gif format) used in the Air Trends Report. The data used in the graphics are also available below in Excel format. Note that the data file is password protected. When the file opens and asks for a password, click on "Read Only" to view the data.

Figure Description

Figure 1

Number of people (in millions) living in counties with air quality concentrations above the level of the primary (health-based) National Ambient Air Quality Standards (NAAQS) in 2010.

Air Pollution

Figure 2

Distribution of national total emissions estimates by source category for specific pollutants, 2010.

Figure 3

Comparison of growth measures and emissions, 1990-2010.

Six Common Pollutants

Figure 4a
Figure 4b

Comparison of national levels of the six common pollutants to the most recent national ambient air quality standards, 1990-2010.  National levels are averages across all monitors with complete data for the time period.

Figure 5

Air quality trends in nonattainment areas exceeding the ozone and particle pollution standards in 2010.

Figure 6

Number of days on which AQI values were greater than 100 during 2002-2010 in selected cities.


Figure 7

National 8-hour ozone air quality trends, 2001-2010 (average of annual fourth highest daily maximum 8-hour concentrations in ppm).

Figure 8

Ozone concentrations in ppm, 2010 (fourth highest daily maximum 8-hour concentration).

Figure 9a
Figure 9b
Figure 9c
Figure 9d

Trends in average summertime daily maximum 8-hour concentrations in ppm (May-September), before and after adjusting for weather nationally, in western states, and in eastern states, (and the location of rural and urban monitoring sites used in the averages).

Particle Pollution

Figure 10a
Figure 10b

National PM2.5 air quality trends, 2001-2010 (annual average concentration and 98th percentile of 24-hour concentration in µg/m3).

Figure 11a
Figure 11b

Annual average and 24-hour (98th percentile of 24-hour concentrations) PM2.5 concentrations in µg/m3, 2010.

Figure 12a
Figure 12b
Figure 12c
Figure 12d

Trends in annual, cool-month (October-April) and warm-month (May-September) average PM2.5 concentrations in µg/m3 (before and after adjusting for weather), and the location of urban monitoring sites used in the average.

Figure 13

National PM10 air quality trend, 2001-2010 (second maximum 24-hour concentrations in µg/m3).

Figure 14

PM10 concentrations in µg/m3, 2010 (second maximum 24-hour concentration).


Figure 15

National lead air quality trend, 2001-2010 (maximum 3-month average in µg/m3).

Figure 16

Lead concentrations in µg/m3, 2010 (maximum 3-month averages).

NO2, CO, and SO2

Figure 17

National NO2 air quality trend, 2001-2010 (annual average in ppm).

Figure 18

National CO air quality trend, 2001-2010 (second maximum 8-hour average in ppm).

Figure 19

National SO2 air quality trend, 2001-2010 (annual average in ppm).

Figure 20

NO2 concentrations in ppb, 2010 (98th percentile in daily 1-hr maximum).

Figure 21

SO2 concentrations in ppb, 2010 (99th percentile of daily 1-hr maximum).

Toxic Air Pollutants

Figure 22

Estimated census-tract cancer risk from the 2005 National-Scale Air Toxics Assessment (NATA2005).  Darker colors show greater cancer risk associated with toxic air pollutants.

Figure 23

National Air Toxics Trends Sites (NATTS).

Figure 24

Distribution of changes in ambient concentrations at U.S. toxic air pollutant monitoring sites, 2003-2010 (percent change in annual average concentrations).

Climate Change and Air Quality

Figure 25

Domestic greenhouse gas emissions in teragrams of carbon dioxide equivalents (TgCO2 eq), 1990-2009.  

Figure 26

Estimates of global average radiative forcing (W/m2 resulting from changes in key climate-related air pollutants between the pre-industrial era and 2005.    


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