The EPA's Staff Paper on ozone was
released during the summer of 1996. In the report, EPA reaffirmed
for vegetation effects the importance of high hourly average
concentrations (i.e., greater than or equal to 0.10 ppm) and
the presence of these peaks in the treatments that were used
to estimate the 10% yield reduction levels that were used to
set a possible secondary standard. The EPA documented the following: