File:National Air Quality Concentration Averages 1990-2015 US EPA.png

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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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Vertical resolution	28.35 dpc