What information does the aerosol Ångström exponent give us about aerosols?

(a) What information does the aerosol Ångström exponent give us about aerosols?

(b) Figure 2(a) shows the aerosol optical depth and Figure 2(b) shows the Ångström exponent from POLDER satellite data for May 1997. What does the combination of these two satellite images indicate about the composition/source of aerosols (e.g., desert dust versus urban pollution) in the areas shown by the white boxes (A, B, C and D), and why?

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