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- The cold air masses are moving from siberia towards inner mongolia .
- The major controlling influence is the inflow of a cold, dry, air mass .
- The products of combustion and of industrial processing are contained with a confined air mass .
- Each of the preceding classifications of polluted air masses involves primarily particulate pollutants .
- Weather systems associated with air masses are usually several hundred to a thousand or miles across and move from west to east .
- a large body of air with uniform characteristics horizontally