Dense haze was drifting eastward from China across the Yellow Sea, the Korean Peninsula, and Japan on December 22, 2003. Winter is a time of increased coal usage for heating in east Asia, and this may account for some of the haze.
This SeaWiFS image was collected starting at 4:23 UTC— just under 3 hours before winter solstice, which occurred at 7:04 UTC.
Image courtesy SeaWiFS Project, NASA/Goddard Space Flight Center, and ORBIMAGE