- mass associated with elemental carbon;

- mass associated with fine soil (i.e., crustal material);

- mass associated with coarse particulate matter (i.e., PM10 - PM2.5).

Current speciated measurements in a Class I area are used in an empirically derived

equation to estimate light extinction for each day with measurements. Days are ranked

according to their resulting light extinction (measured in deciviews). This ranking is used to

identify the 20% of days with worst and 20% of days with best visibility during each year in the

base period. The 20% worst and best days are examined to estimate appropriate observed

concentrations for the components of PM on “best” and “worst” days.

Observed component concentrations are multiplied by the corresponding relative

response factors to estimate future concentrations for each component on “best” and “worst”

days. Future component concentrations are then inserted into the equation relating light

extinction to concentrations of particulate matter. The resulting estimates for future light

extinction on “best” and “worst” days are compared with observations made during the base

period to see assess the future year visibility improvement.



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