The total sulfate, nitrate and organic carbon compound concentrations are each split into

two fractions, representing small and large size distributions of those components. The organic

mass concentration used in the new algorithm is 1.8 times the organic carbon mass

concentration, changed from 1.4 times carbon mass concentration used for input into the old

IMPROVE algorithm. New terms have been added for sea salt (important for coastal locations)

and for absorption by NO2 (only used where NO2 data are available). Site-specific Rayleigh

scattering is calculated for the elevation and annual average temperature of each IMPROVE

monitoring site.

The apportionment of the total concentration of sulfate compounds into the

concentrations of the small and large size fractions is accomplished using the following

equations.

[Large Sulfate] = [Total Sulfate]/20 ug/m3 x [Total Sulfate], for [Total Sulfate] < 20 ug/m3

[Large Sulfate] = [Total Sulfate], for [Total Sulfate] $ 20 ug/m3

[Small Sulfate] = [Total Sulfate] - [Large Sulfate]

The same equations are used to apportion total nitrate and total organic mass

concentrations into the small and large size fractions.

Sea salt is calculated as 1.8 x [Chloride] or 1.8 x [Chlorine] if the chloride measurement

 

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