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.08 .09 .10 .11 .12 .13 .14 .15 .16 Average Ozone Concentration (ppm) During Activity Period

FIG. 5.1.14 Likelihood of adverse effects from ozone while exercising. The likelihood of experiencing adverse effects depends on 1) the ozone concentration, 2) the vigorousness of the activity, and 3) the number of hours engaged in that activity. The figure on the left shows the number of hours to reach an adverse effect under moderate exercise conditions (e.g., construction work or children playing). The figure on the right shows that fewer hours are needed under heavy exercise (e.g., competitive sports or bicycling). The current 1-hr ozone standard is shown for comparison. (Reprinted from Office of Technology Assessment 1989.)

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