Step 4. Multiply the relative response factors times the measured daily species

concentration data during the base period to compute future daily species concentrations.

In year 1, we previously identified days 6 and 7 as those included in the 20% of days

with worst visibility (i.e., see Step 1). Similarly, days 1 and 10 are the 20% of days with best

visibility. In this step, we need to estimate future concentrations for components of PM2.5 and

for CM for these two sets of days. This is done using information shown in tables presented in

Steps 1 and 3 as well as the best days RRFs given in table 6.7 below:

Similar calculations (using the same model derived component specific RRFs) are performed for

each of the “worst” and “best” days in each of the other 4 years in the base period79.

Step 5. Using the results in Step 4, calculate the future year extinction coefficients for the

20% best and 20% worst visibility days in each of the five base years.

Using future PM components obtained in Step 4, we can estimate future daily total bext.

For year 1

Worst Days

Day 6: bext = (3)(4.6)[6.50] + (3)(4.6)[0.59] + (4)[3.35] + (10)[0.53] + 1.10 + (0.6)[11.87] + 10

= 134.8 Mm-1

Day 7: bext = (3)(4.4)[7.19] + (3)(4.4)[0.67] + (4)[3.10] + (10)[0.51] + 0.91 + (0.6)[11.24] + 10 =

139.0 Mm-1

Best Days

Day 1: bext = (3)(1.7)[3.94] + (3)(1.7)[1.84] + (4)[3.29] + (10)[0.70] + 0.36 + (0.6)[7.76] + 10 =

64.6 Mm-1

Day 10: bext = (3)(2.7)[4.63] + (3)(2.7)[1.16] + (4)[3.18] + (10)[0.60] + 0.71 + (0.6)[8.58] + 10 =

 

 

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