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How can I tell if the aerosols being observed are dust or smoke?

Currently there is no definitive test or product parameter available to conclude that the MODIS aerosol product is measuring dust or smoke.  Over ocean a low fine mode fraction is a strong indicator of dust but is not definitive.  Often ancillary information must be included to try to make this determination.  This ancillary information can include: AERONET data, AIRS dust product (over ocean), MISR data, OMI aerosol index, VIIRS suspended matter product, back trajectories which link to a dust or smoke origin.