Dataset Overview

Measured ambient concentrations of ozone pollution to determine compliance with the National Ambient Air Quality Standard. Sample duration is 1-hour.

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Ground-level ozone is formed through a chemical reaction between air-born organic compounds (VOCs) and nitrogen oxides (NOx) when exposed to sunlight1. High levels of ozone exposure can cause leaf damage, which can reduce the efficiency of processes such as photosynthesis. Foliar damage due to ozone exposure is the first visible sign of injury, and indicates impaired physiological processes in the leaves1. For some trees, ozone exposure can increase the likelihood of secondary stressors, like damage caused by diseases, insects, or weather events. Ozone is expressed as the average concentration (in parts per million) between the hours of 8:00 am and 8:00 pm2 from April 1 to September 30. Due to regulations, ground-level ozone pollution has improved gradually over the past decade.

Data Collection Status

Data collection for this dataset is ongoing

Start date



279932 records with 7 fields

Data Availability

This dataset is downloadable from the FEMC, and available to download from another site.

Data License

Linked - Third party determines data license

Preferred Citation

Not provided

Update Frequency


Maintenance Plan

Not provided


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