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Summary
| Description |
English: Graph, "National Air Quality Concentration Averages", showing decreases in US air pollution concentrations during 1990 to 2015, based on monitoring data for nine air quality parameters. |
| Date | |
| Source | U.S. Environmental Protection Agency, "Our Nation's Air: Status and Trends Through 2016." |
| Author | U.S. Environmental Protection Agency, Washington, D.C. |
Licensing
 |
This image (or other media) is a work of an
Environmental Protection Agency employee, taken or made as part of that person's official duties. As
works of the
U.S. federal government, all EPA images are in the
public domain.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:51, 9 December 2017 |
| 1,600 × 1,200 (209 KB) | Moreau1 | =={{int:filedesc}}== {{Information |Description={{en|1=Graph, "National Air Quality Concentration Averages", showing decreases in US air pollution concentrations during 1990 to 2015, based on monitoring data for nine air quality parameters.}} |Source=U... |
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