8 Questions
What is a primary pollutant?
A pollutant put directly into the atmosphere by human or natural activity
Which of the following is a secondary pollutant?
Ground-level ozone
Which activity contributes most to nitrogen oxide emissions?
Power plants
What is the major source of sulfur dioxide emissions?
Coal-burning power plants
Which pollutant is directly emitted by vehicles and gas stations?
Volatile Organic Compounds (VOCs)
How does ground-level ozone form?
By emission from cars reacting with UV rays of the sun
What is a common source of fine particulate matter in the air?
Wood-burning fireplaces
Which legislation gives the EPA the authority to regulate vehicle emissions in the United States?
The Clean Air Act
Learn about the causes of air pollution, from industrial burning to automobile exhausts. Explore the difference between primary and secondary pollutants and understand how pollutants can be solid, liquid, or gas.
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