The OMPS AI shows dust from the Sahara over northern Africa that is being blown over the Atlantic (with yellow, less opaque colors representing less dust and pink, more opaque colors representing more dust). Dust can also be seen over Saudi Arabia and parts of Iran, Afghanistan, and Pakistan. However, the aerosol index signal over the Western U.S. is due to dense smoke from wildfires, while smoke from agricultural biomass burning is visible over both South American and southern Africa. The sun glint in the middle of each swath shows the pattern of the satellite's view in orbit.
The second image from September 17, 2012 shows the smoke over the U.S. moving over the Midwest and stretching all the way to the Mid-Atlantic, with additional smoke appearing over Australia due to many wildfires burning there. → [web view] [hi-resolution]