Average light extinction coefficients (1/Mm) of the major aerosol chemical components during the 20% worst days in each month based on data available during 2000-2004

Location Month Rayleigh Sulfate Nitrate OMC LAC Soil Sea Salt CM Aerosol Ext Bext
ROMA1 1 12.00 48.54 12.04 36.64 8.85 0.41 0.20 2.11 108.78 120.78
ROMA1 2 12.00 60.00 9.31 41.36 10.51 0.39 0.48 3.01 125.06 137.06
ROMA1 3 12.00 50.41 5.72 42.18 4.38 0.42 0.31 2.68 106.10 118.10
ROMA1 4 12.00 61.43 6.96 50.50 5.01 0.65 0.21 2.47 127.23 139.23
ROMA1 5 12.00 86.77 4.04 24.66 5.33 0.82 0.08 4.58 126.29 138.29
ROMA1 6 12.00 87.62 3.36 15.43 4.05 0.52 0.04 3.97 114.97 126.97
ROMA1 7 12.00 139.00 3.30 16.53 4.05 0.88 0.15 3.38 167.28 179.28
ROMA1 8 12.00 111.14 3.24 12.47 4.23 0.51 0.18 2.58 134.35 146.35
ROMA1 9 12.00 106.85 3.48 15.06 4.95 0.50 0.10 3.17 134.11 146.11
ROMA1 10 12.00 95.48 4.26 21.22 6.57 0.48 0.08 3.68 131.76 143.76
ROMA1 11 12.00 87.47 7.70 41.61 6.39 0.45 0.00 1.83 145.45 157.45
ROMA1 12 12.00 72.96 11.03 31.22 5.83 0.49 0.09 1.94 123.58 135.58