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For more information about National Park Service air resources, please visit

Air Quality Monitoring History Database

Reports from this site provide information about when, where, and what the National Park Service (NPS) monitors. This database is not a comprehensive list of all air quality monitors in the United States.

Search by:

NPS Unit — Monitoring sites associated with an NPS Unit

Parameter — Monitoring sites by type for example ozone, humidity, or mercury

Since the late 1970's, the NPS has monitored visibility, gaseous pollutants (mainly ozone), and atmospheric deposition. Meteorological monitoring is also conducted at many locations to aid in interpretation of measured air pollutant levels. Monitoring networks that the NPS participates in include:

For additional information contact Melanie Peters, NPS Air Resources Division, Denver, CO (303-969-2315).

Last Updated: February 27, 2017