File:Air pollution by industrial chimneys.jpg

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Air_pollution_by_industrial_chimneys.jpg(750 × 500 pixels, file size: 256 KB, MIME type: image/jpeg)

From the National Park Service source

"Photo was taken prior to installation of emission controls equipment for removal of sulfur dioxide and particulate matter."

Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.

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current22:31, 22 May 2007Thumbnail for version as of 22:31, 22 May 2007750 × 500 (256 KB)ArtMechanic (talk | contribs)
03:21, 24 November 2004Thumbnail for version as of 03:21, 24 November 2004673 × 447 (70 KB)Quadell (talk | contribs)From the National Parks Service [ source] {{PD-USGov}}
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