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


2006 Ozone Standard Exceedances in National Parks

The National Park Service (NPS) actively monitors ozone at its parks from April to October. Ozone measurements are compared with the National Ambient Air Quality Standard (NAAQS) for ozone. The Environmental Protection Agency (EPA) sets this standard as the level at which the ozone in the air becomes unhealthy.

The level of the National Ambient Air Quality Standard (NAAQS) for ozone in 2006 was 80 part per billion (ppb), daily maximum 8-hour average. The ozone standard was exceeded at an ambient air quality monitoring site when the 3-year average of the annual fourth-highest daily maximum 8-hour average ozone concentration was greater than 85 ppb, which occured when the 3-year average equaled or exceeded 85 ppb. The table below counts the number of days when the daily maximum 8-hour average ozone concentration equalled or exceeded 85 ppb in 2006.

2006 Ozone Standard Exceedances

National Park April May June July Aug. Sept. Oct. 2006 Season
Total Count Max 8-hr O3 (ppb) 4th highest max.
8-hr O3 (ppb)
Assateague Island – Maintenance Area 0 0 1 1 0 0 0 2 89 84
Death Valley – Park Village 0 0 1 1 0 0 0 2 88 82
Great Smoky Mtns – Clingman’s Dome 0 0 2 2 0 0 0 4 89 86
Great Smoky Mtns – Cove Mountain 0 0 1 1 0 0 0 2 86 80
Great Smoky Mtns – Look Rock 0 1 2 1 2 0 0 6 89 85
Joshua Tree – Black Rock 0 10 14 7 4 1 0 36 105 103
Joshua Tree – Cottonwood Canyon 0 0 1 0 0 0 0 1 87 79
Joshua Tree – Pinto Wells 0 2 0 0 0 0 0 2 89 83
Lake Mead – Meadview 0 1 0 0 0 0 0 1 87 81
Mammoth Cave – Houchin Meadow 0 0 0 0 0 0 0 0 74 71
Padre Island – Malaquite Visitor Center 0 0 1 0 0 0 0 1 89 80
Petrified Forest – South Entrance 0 0 1 0 0 0 0 1 85 71
Pinnacles – East Entrance Station 0 0 0 1 0 0 0 1 88 78
Rocky Mountain – Longs Peak 0 0 0 1 0 0 0 1 91 76
Sequoia & Kings Canyon – Ash Mountain 0 0 9 9 20 11 0 49 109 104
Sequoia & Kings Canyon – Lower Kaweah 0 0 5 5 6 1 0 17 101 97
Yosemite – Turtleback Dome 0 3 0 0 1 0 0 4 94 85
Zion – Dalton’s Wash 0 0 2 0 0 0 0 2 138 75

Validation Level *

2

2

2

2

2

2

2

 

 

 


Annual Exceedance Summaries

2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004

2003 (pdf, 137 KB) | 2002 (pdf, 146 KB) | 2001 (pdf, 136 KB) | 2000 (pdf, 133 KB)


Compiled Exceedance Summaries


Last Updated: June 20, 2012