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


2004 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 2004 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 2004.

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

2004 Ozone Standard Exceedances

National Park April May June July Aug. Sept. Oct. 2004 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 79 73
Big South Portable 0 0 0 1 3 0 0 4 115 87
Black Canyon Portable 0 1 0 0 0 0 0 1 91 80
Great Smoky Mountains – Cades Cove 0 0 0 0 0 0 0 0 70 66
Great Smoky Mountains – Clingman’s Dome 0 0 0 0 0 0 0 0 83 76
Great Smoky Mountains – Cove Mountain 0 0 0 1 0 0 0 1 86 74
Great Smoky Mountains – Look Rock 0 2 0 0 0 0 0 2 86 82
Gulf Island Portable 0 0 0 0 2 0 0 2 96 73
Joshua Tree – Yucca Valley 1 6 12 8 3 1 0 31 107 102
Lake Mead – Meadview 1 1 0 0 0 0 0 2 90 80
Mammoth Cave – Houchin Meadow 0 0 0 0 0 0 0 0 72 70
Pinnacles – East Entrance Station 0 0 0 0 0 0 0 0 83 77
Rocky Mountain – Long’s Peak Station 0 0 0 0 0 0 0 0 76 73
Sequoia & Kings Canyon – Ash Mountain 0 3 14 7 15 8 5 52 103 99
Sequoia & Kings Canyon – Lookout Point 0 4 12 18 11 4 1 50 101 95
Sequoia & Kings Canyon – Lower Kaweah 0 0 0 10 8 5 1 24 99 95
Shenandoah – Big Meadows 0 0 0 1 0 0 0 1 87 75
Yosemite – Turtleback Dome 0 1 1 5 0 1 0 8 124 89

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