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


2008 Ozone Standard Exceedances in National Parks

Map of 2008 Ozone Exceedances (Click photo 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.

In the spring of 2007, EPA made the ozone standard more stringent (lowering it from 85 parts per billion (ppb) to 75 ppb). As a result, many more parks were added to the list of exceedances in 2008. The table below displays the parks and the ozone values along with the number of days when the daily maximum 8-hour average ozone concentration exceeded the standard of 75 parts per billion (ppb). The fourth highest ozone column has been color-coded for easier viewing. The thumbnail on the right links to a map of parks with 2008 ozone exceedances.

2008 Ozone Standard Exceedances

National Park April May June July Aug. Sept. Oct. 2008 Season
Total Count Max 8-hr O3 (ppb) 4th highest max.
8-hr O3 (ppb)
Acadia– Cadillac Mountain 0 0 0 2 0 0 0 2 90 74
Assateague Island– Maintenance Area 0 0 2 1 0 0 0 3 83 74
Cape Cod– State Monitor 0 0 1 2 0 0 0 3 106 75
Chamizal– State Monitor 0 0 1 0 1 1 0 3 84 73
Cowpens– State Monitor 1 0 2 1 1 0 0 6 85 79
Cumberland Gap– Hensley Settlement 0 0 1 0 0 0 0 1 76 70
Death Valley– Park Village 0 0 4 1 0 0 0 5 94 77
Denali– Headquarters 1 0 0 0 0 0 0 1 76 68
Great Basin– Maintenance Yard 1 0 0 0 0 0 0 1 76 71
Great Smoky Mountains– Cades Cove 0 1 0 0 0 0 0 1 78 71
Great Smoky Mountains– Clingmans Dome 1 1 3 4 0 0 0 9 86 80
Great Smoky Mountains– Cove Mountain 1 0 1 4 1 0 0 7 83 79
Great Smoky Mountains– Look Rock 1 4 1 4 4 0 0 14 87 82
Great Smoky Mountains– Purchase Knob 1 0 0 4 0 0 0 5 89 80
Joshua Tree– Black Rock 6 6 22 17 14 5 0 70 110 105
Joshua Tree– Cottonwood Canyon 1 3 10 3 0 0 0 17 88 84
Joshua Tree– Pinto Wells 3 5 3 2 0 0 0 13 85 82
Lassen Volcanic– Manzanita Lake Fire Stn. 0 0 6 2 0 0 0 8 104 83
Mammoth Cave– Houchin Meadow 0 0 0 0 0 0 0 0 73 70
Mojave– Kelso Mountains 2 5 11 12 3 2 0 35 100 86
Pinnacles– SW of East Entrance Stn. 0 0 4 5 0 3 0 12 94 86
Rocky Mountain– Long's Peak 0 2 0 2 0 0 0 4 81 76
Rocky Mountain– Trail Ridge 0 0 0 1 0 0 0 1 76 67
Saguaro– Pima County 0 0 1 0 0 0 0 1 80 74
Sequoia and Kings Canyon– Ash Mountain 0 11 19 19 4 17 4 74 121 112
Sequoia and Kings Canyon– Lower Kaweah 0 3 18 25 21 6 0 73 113 101
Shenandoah– Big Meadows 2 1 2 0 0 0 0 5 81 78
Yosemite– Mobile 0 0 4 8 3 3 0 18 102 83
Yosemite– School Yard 0 0 0 3 0 0 0 3 105 75
Yosemite– Turtleback Dome 1 1 12 10 6 5 0 35 102 94
Zion National Park– Dalton's Wash 1 0 0 0 0 0 0 1 76 72

Validation Level *

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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: October 23, 2013