Step 2. Calculate the average baseline deciviews for the 20% of days with worst visibility
and the 20% days with best visibility.
For year 1, mean worst visibility = (28.0 + 28.4) / 2 = 28.2 dv, and
mean best visibility = (19.7 + 22.0) / 2 = 20.9 dv
Mean worst and best visibility for years 2-5 is provided in table 6.4. Table 6.4 below
summarizes mean worst and best visibility for each of the 5 years in the base period.
The “average mean baseline worst and best visibility” is obtained by taking the arithmetic
average of the mean worst and best visibility for the 5 years. Thus, the average mean worst
visibility is given by
dvbaseline = (28.2 + 29.1 + 30.2 + 27.8 + 28.5) / 5 = 28.8 dv
The average mean best visibility is
dvbaseline = (20.9 + 20.4 + 18.7 + 19.1 + 19.5) / 5 = 19.7 dv
Step 3. Apply a model to develop component specific RRF’s for SO4, NO3, OC, EC, Soil
and for coarse mode particulate matter (CM).
Tables 6.5 and 6.6 show the procedure for calculating component-specific relative
response factors using an air quality model. Component-specific relative response factors are
computed as described in Section 4.3. The example shows the calculation of RRFs for the worst
days in the year modeled. The same calculation is repeated for the best days.
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