In the Eastern United States, hourly concentrations of ozone typically range from 30 to 50 parts per billion
(ppb), with events that may exceed 100 ppb. Typical exposure levels can cause visible foliar injury to
Anita K. Rose; John W. Coulston
Biomonitoring, FIA, forest health, indicator species, ozone
Gen. Tech. Rep. SRS–118. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station. 25 p.