2004 Ozone Standard Exceedances in National Parks
Overview
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.
2004 Ozone Standard Exceedances
| Month | April | May | June | July | Aug. | Sept. | Oct. | 2004 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 | 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 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 Exceedances | 2002 Exceedances | 2001 Exceedances | 2000 Exceedances |
| Ozone Exceedances in Parks 1983-2005 | Ozone Concentrations in Parks 1983-2005 |
Detailed Summaries (PDF) by park unit for multiple years are also available.
Visit the EPA AIRNow web site to see a map of current ozone conditions at national parks across the United States. Ozone forecasts are also available.
Current Ozone and Weather data for national parks is available in table format on the NPS web site.