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2010 Ozone Standard Exceedances in National Parks

Map of 2010 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.

The level of the NAAQS for ozone in 2010 was 75 part per billion (ppb), daily maximum 8-hour average. The NPS tracks the days when the standard is exceeded in the parks. The table below displays the parks and the ozone values along with the number of days where the daily maximum 8-hour average ozone concentration exceeded 75 parts per billion (ppb). The thumbnail on the right links to a map of parks with 2010 ozone exceedances.

2010 Ozone Standard Exceedances

National Park April May June July Aug. Sept. Oct. 2010 Season
Total Count Max 8-hr O3 (ppb) 4th highest max.
8-hr O3 (ppb)
Acadia– Cadillac Mountain 0 1 0 0 0 2 0 3 89 75
Acadia– McFarland Hill 0 0 0 0 0 1 0 1 90 70
Assateague– Maintenance Area 0 0 0 2 1 0 0 3 100 75
Cape Cod– State Site 0 0 1 1 0 1 0 3 86 73
Canyonlands– Island in the Sky 0 0 1 0 0 0 0 1 76 68
Chickamauga/Chatanooga– Lookout Mountain 3 1 0 0 0 3 1 8 83 80
Cowpens– State Monitor 3 0 0 0 0 0 0 3 77 72
Death Valley– Park Village 0 0 0 0 0 1 0 1 76 69
Great Basin– Maintenance Yard 0 0 0 0 1 0 0 1 77 69
Great Smoky Mountains– Clingman's Dome 0 2 0 3 0 1 1 7 84 77
Great Smoky Mountains– Cade's Cove 1 0 0 0 0 1 0 2 78 73
Great Smoky Mountains– Cove Mountain 5 3 0 0 0 1 2 11 81 79
Great Smoky Mountains– Look Rock 4 2 0 2 0 2 1 11 84 81
Joshua Tree– Black Rock 2 8 17 16 9 1 0 53 105 97
Joshua Tree– Cottonwood Canyon 0 1 7 0 0 0 0 8 80 78
Joshua Tree– Pinto Wells 0 1 4 1 0 0 0 6 82 76
Mammoth Cave– Houchin Meadow 2 0 0 0 0 0 0 2 78 75
Mesa Verde– Resource Management Area 0 1 0 0 0 0 0 1 77 66
Mojave– Kelso Mountains 0 0 3 1 0 0 0 4 80 77
Pinnacles– SW of East Entrance Stn. 0 0 0 0 0 1 0 1 77 71
Rocky Mountain– Long's Peak 1 0 3 1 1 0 0 6 82 77
Sequoia and Kings Canyon– Ash Mountain 0 0 8 23 19 14 2 66 99 94
Sequoia and Kings Canyon– Lower Kaweah 0 0 2 4 2 1 0 9 79 77
Shenandoah– Big Meadows 0 0 0 2 0 0 1 3 82 74
Yosemite– Mobile 0 0 0 0 1 1 0 2 81 73
Yosemite– Turtleback Dome 0 0 0 1 2 4 0 7 85 77

Validation Level *

2

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2

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2

 

 

 


Annual Exceedance Summaries

2015 | 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: March 16, 2016