2005 Ozone Standard Exceedances in National Parks
The level of the National Ambient Air Quality Standard (NAAQS) for ozone is 0.08 ppm, daily maximum 8-hour average. The ozone standard is 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 is greater than 0.08 ppm, which occurs when the 3-year average equals or exceeds 0.085 ppm (85ppb). The table below counts the number of days when the daily maximum 8-hour average ozone concentration equaled or exceeded 85ppb.
2005 Ozone Standard Exceedances
| April | May | June | July | Aug. | Sept. | Oct. | 2005 Season | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Validation Level * | 2 | 2 | 2 | 2 | 2 | 2 | 2 | Total Count | Max 8-hr O3 (ppb) |
4th highest max. 8-hr O3 (ppb) |
| National Park | Count | Count | Count | Count | Count | Count | Count | |||
| 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 0 indicates raw data. Validation level 1 indicates screened data. Validation
level 2 indicates final, validated data. Counts of days with 8-hr average ozone greater than 85 ppb may change after the data is fully validated. The ozone season runs from May to September for the detailed current ozone conditions. During the winter more limited numbers of locations and web products are available. |
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2003-2005 Average Annual 4th Highest Daily Maximum for NPS Units
(Click chart for larger image)
Detailed Summaries (PDF) by park unit for multiple years are also available.
PDF files require the Adobe Acrobat reader to view and print. Download a FREE copy of the reader here.
Current Ozone Conditions in National Parks
Visit the EPA AIRNow web site to see a map of current ozone conditions at national parks across the United States.
Ozone forecasts for today and tomorrow are also available.
Current Ozone and Weather data for national parks is available in table format on the NPS web site.