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Additional information on vegetation effects

Additional information on background ozone levels

Additional information on attaining the 8-hour ozone standard

Additional recommended readings

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The Identification of Ozone Exposures that Result in Vegetation Injury and Growth Loss for Specific Species Grown in the Southern Appalachian Mountains

Concern about surface ozone effects on vegetation occurs in many parts of the United States. Most of the available information concerning the effects of ozone on vegetation is the result of experimental exposure-response studies of important agricultural crops and some selected forest tree species, usually seedlings. Some ozone exposures (i.e., concentration applied over time) result in visible foliar injury to the plant without growth reduction; other exposures result in growth reduction and decrease in productivity without visible injury, whereas some exposures result in both.

For assessing possible vegetation effects, A.S.L. & Associates has

  • Described ways in which ozone exposures to vegetation have been summarized for field and controlled studies and recommended biologically relevant exposure statistics athat re the most important in describing a biological response;
  • Compiled and examined the information from several sources and reviewed the articles published;
  • Developed either exposure-response curves or summary tables describing the relationship between the ozone exposure and a specific biological endpoint (i.e., injury or damage);
  • Compared ozone levels illustrated in the response curves with ambient ozone levels observed across the region of interest for the period 1990-1995; and
  • Described ways in which "scientifically defensible" atmospheric modeling results for ozone can be integrated with the results from this study.

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