This analysis assumes that data from the Ike's Backbone is the most representative IMPROVE site for this area.  As shown in Figure 2, the overall average total light extinction coefficient (Bext) is 27.6 Mm^-1 (Visual Range ~ 141 Km; Deciview ~ 10.2). The average PM_2.5 mass concentration is 4.3 mg/m³. The average contributions of the major aerosol components to Ike's Backbone haze are particulate sulfate 19.7%, nitrate 7.6%, organic matter (OMC) 14.1%, elemental carbon (light absorbing carbon, LAC) 5.3%, fine soil 4.7% and coarse mass (CM) 12.3%. 

As shown in Figure 3, CM is the largest aerosol contributor to haze in the 20% worst days from April to June, with a contribution of ~ 25%. Sulfate is the largest aerosol contributor from July to December, with a contribution of ~ 20 - 25% in the worst days. Nitrate is the largest aerosol contributor in January and February, with a contribution of ~ 27% in the worst days. OMC contributes about 15 - 20% to haze in the worst days from April to November.