Find: Is the control strategy simulated in this model analysis sufficient to meet the uniform rate
of progress in this Class I area?
Step 1. Using monitored data, rank baseline visibility for each day with PM10, PM2.5 and
speciated PM2.5 measurements within a Class I area.
First, estimate the extinction coefficient for each day with the needed PM measurements.
This is done using the information in table 6.2 with Equation (6.1). For day 1 in year 1, the
current extinction coefficient is:
bext = (3)(1.7)[4.53] + (3)(1.7)[2.23] + (4)(1)[3.37] + (10)[0.89] + (1)[0.32] + (0.6)[7.33]
bext = 71.6 Mm-1
Then convert extinction into deciviews:
dv = 10 * ln(71.6/10) = 19.7 dv
Current extinction coefficients and deciviews for the remaining 9 days with monitored data in
year 1 are calculated in a similar manner. The days are then ranked. The day with the highest
deciviews (i.e., worst visibility) is given a rank of “1". The results of these calculations are
displayed in the table 6.3 below. Based on these rankings, days 6 and 7 comprise the 20% of
days with worst visibility. Days 1 and 10 comprise the 20% of days with best visibility
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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