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AOD over cities seems to have some problems. Why is that?

The MODIS Dark Target algorithm uses a set of ratios and relationships between the 0.47, 0.67 and 2.1 ┬Ám channels to account for the surface signal.

These relationships begin to break down over the brighter surfaces of urban areas.   Improving the product over cities is an active area of research.  Please contact us if you would like more information.