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Ozone Concentrations: Longterm Trends

Line graph showing annual ozone concentrations from 1993 to 2017 in comparison with the current human health standard for ozone of 70 parts per billion. The graph shows a decreasing trend in ozone concentrations with levels below the standard beginning in 2013.

Ozone levels have improved significantly and now meet the human-health standard for ozone.

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Shenandoah National Park, Code: SHEN

Shenandoah National Park, Virginia
Latitude: 38.3517684936523, Longitude: -78.5008163452148

NPS.gov Collection

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Tuesday, February 26, 2019 9:20:28 AM

Tuesday, February 26, 2019 9:20:28 AM

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