Section 1:  What Causes Air Pollution?

Chapter 12 Section 1 Presentation
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Key Terms:

• air pollution
• primary pollutant
• secondary pollutant
• smog
• temperature inversion

Main Ideas:

• Primary pollutants are pollutants put directly in the air by human activity.
• Secondary pollutants are formed when a primary pollutant comes into contact with other primary pollutants or with naturally occurring substances and a chemical reaction takes place.
• Most air pollution comes from vehicles and industry.
• Air pollution that hangs over cities and reduces visibility is called smog.
• Pollution can be trapped near the surface of the Earth by a temperature inversion.