For more information about National Park Service air resources, please visit http://www.nature.nps.gov/air/.


Ozone Health Advisory Program Summaries

2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004

2011 Ozone Health Advisory Program Summary (4/1/11–10/31/11)

National Park Service Area*

Number of Days
8-hr Ozone
Average > 75 ppb

Number of Days Ozone Health Advisory Issued

Acadia NP 2 1
Grand Canyon NP 2 0
Great Smoky Mtns NP 13 0
Mammoth Cave NP 0 0
Rocky Mountain NP 8 7
Sequoia & Kings Canyon NPs 87 52
Shenandoah NP 2 2
* This table shows the results for NPS areas participating in the 2011 ozone health advisory program.
† Ozone values above 75 part per billion (ppb) exceed the ozone National Ambient Air Quality Standard.

The 8-hour ozone health standard can be exceeded anytime during a 24-hour day time period. Ozone health advisories are initiated during the daylight hours, therefore, the ozone health standard can be exceeded at an area and an ozone health advisory not be issued.


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Last Updated: April 02, 2012