File:Air quality guidelines.png

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Air_quality_guidelines.png ‎(512 × 279 pixels, file size: 70 KB, MIME type: image/png)

Source: WHO Air Quality Guidelines for particulate matter, ozone, nitrogen dioxide and sulfur dioxide from World Health Organisation(2005)

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	11:38, 10 November 2018		512 × 279 (70 KB)	Weien.ng.2016 (talk \| contribs)

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Horizontal resolution	59.06 dpc
Vertical resolution	59.06 dpc