How We Measure Ozone - Air (U.S. National Park Service)

19, Aug. 2024

 

How We Measure Ozone - Air (U.S. National Park Service)

Air quality monitoring station with tipping tower.

Photo courtesy of Mackenize Reed

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Who is monitoring and where?

Ozone monitoring data are collected in or near 102 national parks! NPS staff and partners operate the monitors in 36 of these locations. Across the United States ozone monitoring is conducted by the Environmental Protection Agency (EPA), states, and other agencies. These groups and the NPS contribute to a nation-wide ozone monitoring network by observing common standards and reporting requirements. EPA's Clean Air Status and Trends Network (CASTNET) is largely responsible for site audits and data are reported to the EPA Air Quality System (AQS).

When selecting ozone monitoring locations the NPS considers:

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  • Air quality concerns
  • Regional representation
  • Data gaps

Several national parks also use ozone gardens to monitor the ecological effects of ozone on sensitive plant species.

How often do we measure?

Ozone data are collected continuously (1-minute averages) and reported in one-hour intervals. Because ozone is not stable, it must be measured onsite to accurately determine its concentration in the atmosphere. This also allows us to provide real-time ozone conditions to the public.

An ozone analyzer measures the real-time ozone concentration in the air. Ambient air is drawn through a sampler inlet from the top of a 10-meter tipping tower by a pump. A filter located at the top of the tipping tower removes particles like dust and pollen from the air sample to prevent them from reacting with ozone before it reaches the analyzer.

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