Reference or equivalent method for measuring PM2.5. Therefore, for regional haze calculations,
it is not necessary to use the speciated data adjustment procedures introduced in Section 3 (the
Sisler (1996) has developed a set of default assumptions75 for mass associated with each
of the components of particulate matter for Equation (6.1). These are presented in Table 6.1.
The components in Table 6.1 are similar to those used in the modeled attainment demonstrations
for the PM2.5 NAAQS. Notice however, that sulfate and nitrate mass are assumed to be fully
neutralized (therefore, ammonium is not needed as a separate component); organic carbon is
assumed to be equal to 1.4 times measured OC mass (1.8 times OC in the new IMPROVE
equation); there is no water component; and there is a term for coarse particulate matter.
Table 6.1. Default Assumptions Used To Derive Aerosol Species Concentrations For
Estimating Extinction Coefficients
75The default assumptions in table 6.1 are applicable to the “old” IMPROVE equation.
The new IMPROVE equation assumes that OCM= 1.8 x [OC] and sea salt = 1.8 x [chloride].
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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