4.2 How Do I Apply The Recommended 8-Hour Ozone Modeled Attainment


States/Tribes should apply the modeled attainment test at all monitors within the

nonattainment area plus other nearby counties within the State34. Inputs described in Section 3.1

are applied in Equation (3.1) to estimate a future design value at all monitor sites and grid cells

for which the modeled attainment test is applicable. When determining compliance with the 8-

hour ozone NAAQS, the standard is met if, over three consecutive years, the average 4th highest

8-hour daily maximum ozone concentration observed at each monitor is < 0.08 ppm (i.e., # 84

ppb using rounding conventions)35. Thus, if all resulting predicted future design values (DVF)

are # 84 ppb, the test is passed. The modeled attainment test is applied using 3 steps.

34States are responsible for submitting SIPs for all areas of their State. As such, the

monitored and unmonitored area attainment tests should be applied both within and outside of

the nonattainment area. In the modeling protocol, States should identify the appropriate areas to

apply the respective tests. States should work with their EPA Regional Office to help determine

the appropriate areas.

3540CFR Part 50.10, Appendix I, paragraph 2.3



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