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


Ozone Health Advisory Program Summaries

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2007 Ozone Health Advisory Program Summary (5/1/07–9/30/07)

National Park Service Area*

Number of Days
8-hr Ozone
Average > 84 ppb

Number of Days Ozone Health Advisory Issued

Acadia NP 5 3
Great Smoky Mtns NP 19 2
Mammoth Cave NP 0 1
Rocky Mountain NP 0 10
Sequoia & Kings Canyon NPs 49 42
Shenandoah NP 0 0
* This table shows the results for NPS areas participating in the 2007 ozone health advisory program.
† Ozone values above 84 part per billion (ppb) exceed the ozone National Ambient Air Quality Standard of 0.08 part per million (ppm).
‡ Health advisories issued by the National Park Service area were based on State and local advisory forecasts. However, the measured ozone concentration in the Park may not have exceeded the 8-hr average ozone standard on the day of the advisory.

The 8-hour ozone health standard can be exceeded anytime during a 24-hour day time period. Ozone health advisories are initiated during the daylight hours, therefore it is possible that the ozone health standard is exceeded at an area and an ozone health advisory is not issued.

Mammoth Cave NP – there were five days when health advisories were issued at the park. Four days the advisories were for fine particulate matter (less than 2.5 microns) conditions only and one day the advisory was for ozone conditions only.

Great Smoky Mountains NP – there were four days when health advisories were issued at the park. Two days the advisories were for fine particulate matter (less than 2.5 microns) conditions only and two days the advisories were for ozone conditions only.


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Last Updated: April 02, 2012