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Clean Air Online
Monday, December 10, 2007
> > Home > Pollution Issues > Smog > Main Emission Sources
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Main Emission Sources

There are many sources of the pollutants contributing to smog. These include:

  • The transportation sector (on and off road vehicles and engines) is a significant source of NOx, VOCs, and direct particulate matter emissions
  • Electricity Generation and Industry are significant sources of NOx, VOCs, SO2, and direct particulate matter emissions
  • <a href="Industrial_Energy_Use-WS5981102F-1_En.htm