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


2005 Ozone Standard Exceedances in National Parks

2003–2005 Average Ozone Violation Summary for highest 40 sites (Click chart to enlarge)

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 2005 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 occurred 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 equaled or exceeded 85 ppb in 2005.

2003–2005 Average Annual 4th Highest Daily Maximum for
NPS Units (pdf, 130 KB) »

2005 Ozone Standard Exceedances

National Park April May June July Aug. Sept. Oct. 2005 Season
Total Count Max 8-hr O3 (ppb) 4th highest max.
8-hr O3 (ppb)
Acadia NP – McFarland Hill 0 0 0 0 0 0 0 0 83 74
Assateague Portable 0 0 0 0 1 0 0 1 92 72
Death Valley – Park Village 0 4 0 0 0 0 0 4 101 85
Grand Canyon – The Abyss 0 0 0 1 0 0 0 1 89 79
Great Smoky Mtns – Cades Cove 0 0 0 0 0 0 0 0 75 66
Great Smoky Mtns – Clingman’s Dome 0 0 0 0 0 1 0 1 86 78
Great Smoky Mtns – Cove Mountain 0 0 0 1 0 1 0 2 88 79
Great Smoky Mtns – Look Rock 3 0 2 1 0 1 0 7 92 86
Joshua Tree – Black Rock 1 8 3 15 6 2 0 35 112 104
Lake Mead – Meadview 0 0 2 1 0 0 0 3 123 84
Mammoth Cave – Houchin Meadow 0 0 0 0 0 0 0 0 82 75
Pinnacles – East Entrance Station 0 0 0 1 0 0 0 1 85 71
Rocky Mountain – Salvation Army Camp 0 0 0 0 0 0 0 0 84 75
Sequoia & Kings Canyon – Ash Mountain 0 2 6 20 19 6 1 54 112 107
Sequoia & Kings Canyon – Lower Kaweah 0 1 2 16 11 2 0 32 102 97
Yosemite – Turtleback Dome 0 0 0 3 1 1 0 5 96 85
Zion – Dalton»s Wash 0 0 2 2 0 0 0 4 109 91

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