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.

n701 - n702 - n703 - n704 - n705 - n706 - n707 - n707 - n709 - n710 - n711 - n712 - n713 - n714 - n715 - n716 - n717 - n718 - n719 - n720 - n721 - n722 - n723 - n724 - n725 - n726 - n727 - n728 - n729 - n730 - n731 - n732 - n733 - n734 - n735 - n736 - n737 - n738 - n739 - n740 - n741 - n742 - n743 - n744 - n745 - n746 - n747 - n748 - n749 - n750

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