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


2007 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 2007 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 2007.

2007 Ozone Standard Exceedances

National Park April May June July Aug. Sept. Oct. 2007 Season
Total Count Max 8-hr O3 (ppb) 4th highest max.
8-hr O3 (ppb)
Abraham Lincoln Birthplace – Knob Creek High 0 0 1 0 0 0 0 1 85 72
Assateague Island – Maintenance Area 0 0 0 0 2 0 0 2 96 75
Cumberland Gap – Hensley Settlement 0 0 2 0 1 1 0 4 88 85
Death Valley – Park Village 0 1 2 0 3 0 0 6 94 85
Great Smoky Mtns – Clingman’s Dome 0 0 1 0 6 2 0 9 92 87
Great Smoky Mtns – Cove Mountain 0 0 1 0 3 1 0 5 89 88
Great Smoky Mtns – Look Rock 0 2 2 0 5 2 0 11 96 88
Joshua Tree – Black Rock 2 5 14 10 9 0 0 40 106 104
Mammoth Cave – Houchin Meadow 0 0 0 0 0 0 0 0 84 82
Mojave Nat’l Preserve – Kelso Mtns 0 0 3 0 3 0 0 6 101 88
Pinnacles – East Entrance Station 0 0 0 0 0 0 0 0 83 75
Rocky Mountain – Longs Peak 0 0 0 0 0 0 0 0 79 78
Sequoia & Kings Canyon – Ash Mountain 0 4 15 9 10 6 0 44 102 99
Sequoia& Kings Canyon – Lower Kaweah 0 0 9 5 6 5 0 25 94 91
Yosemite – Turtleback Dome 0 1 1 1 2 3 0 8 97 88

Validation Level *

2

2

2

2

2

2

2

 

 

 


Annual Exceedance Summaries

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