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Some of the main sources of Smog are:

• gasoline and diesel powered vehicles
   
• factories and utilities
   
• oil-based paints, solvents and cleaners                
   

• pesticides

• road paving (asphalt) and construction
   
• barbecues
   
• lawnmowers
   
• pollutants carried by the wind from pollution sources in the United States
   
• coal-fired generating stations