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
Step 1. Compute baseline design values. Compute site-specific baseline design values
(DVBs) fromobserved data by using the average of the design value periods which include
the baseline inventory year.
This is illustrated in Table 3.1 for specific sites. The values in the right hand column of
Table 3.1 are site-specific baseline design values.
Step 2. Estimate relative response factors. Use air quality modeling results to estimate a
relative response factor for each grid cell near a monitoring site.
This step begins by computing the mean 8-hour daily maximum ozone concentrations for
future and baseline emissions. The relative response factor for site I is given by Equation 4.1.
(RRF)I = (mean 8-hr daily max)future/ (mean 8-hr daily max)baseline (4.1)
Using Equation (4.1), the relative response factor is calculated as shown in example 3.2.
Note that the RRF is calculated to three significant figures to the right of the decimal place. The
last significant figure is obtained byrounding, with values of “5" or more rounded upward. For
the illustration shown in Table 4.2, we have assumed that the same four days described
previously in Example 4.1 have been simulated. Note that on day 3, model baseline 8-hour daily
maximum ozone concentration was < 85 ppb. As discussed in Section 4.1, predictions for this
day are not included in calculating the mean values shown in the last row of the table. We have
also assumed that the monitored baseline design value (DVB) at site I is 102.0 ppb.
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