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A comparative study on the aerosol optical properties of two severe pollution phenomena occurred in Beijing, i.e. dust and haze-fog, was analyzed using solar and sky radiance measurements from 2001 to 2007. The aerosol optical depth (AOD) showed a distinct variation under different weather conditions, with an average 1.70 in dust days and 1.26 in haze-fog days. The values of Ångström exponent (α)...
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