Average light extinction (1/Mm) and percentage contributions to the aerosol light extinction (Bep) of the major aerosol chemical components in 20% best, middle 60%, and 20% worst days based on data available during the year of 1997-2002

Location Data Sulfate Nitrate OMC LAC Soil CM Aerosol Ext   Sulfate% Nitrate% OMC% LAC% Soil% CM%
WHPA1 20% Best 1.26 0.33 0.29 0.19 0.05 0.20 2.32   54.3% 14.2% 12.6% 8.2% 2.0% 8.7%
WHPA1 Middle 60% 5.80 1.21 1.85 0.72 0.23 0.67 10.48   55.4% 11.5% 17.7% 6.8% 2.2% 6.4%
WHPA1 20% Worst 11.90 2.76 6.56 1.78 0.52 1.81 25.32   47.0% 10.9% 25.9% 7.0% 2.0% 7.2%
WHPA1 Average 6.15 1.35 2.50 0.83 0.25 0.81 11.90   51.7% 11.4% 21.0% 7.0% 2.1% 6.8%