Concentration of ambient ozone is one of a group of measures under the air and water indicator -- one or more is required. The air and water indicator is under the human-caused change monitoring question for natural quality.

This measure is reported as a single value for report year.

The table below shows reported ozone trends at each USFS wilderness using this measure. As ever, selected measures have filled grey circle, and colors indicate an upward, stable, or downward reported trend. Unselected measures can also be recorded, and are shown as hollow circles in the appropriate color.