Suspended particulate matter sampling at an urban AERONET site in Japan, part 2: relationship between column aerosol optical thickness and PM 2.5 concentration

The concentration of suspended particulate matter smaller than 2.5 μm (PM 2.5) was linearly correlated with the column aerosol optical thickness (AOT) based on simultaneous measurements at a NASA/AERONET station at Kinki University Campus, Higashi-Osaka, Japan, between March 2004 and June 2006. The correlation coefficient differed with the aerosol type, being maximal when PM 2.5 values were measured 120 minutes after AOT data for a dust episode, but almost independent of the time difference between measurements for anthropogenic aerosols. The obtained results were validated using data obtained at the Higashi-Osaka and Noto sites. Our results suggest that the PM 2.5 mass concentration can be estimated from the AOT, and vice versa, and hence a distribution map of PM 2.5 can be produced from the satellite-derived AOT map determined from the Aqua/MODIS sensor.

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