Which of the following statements about particulate particles is NOT correct?
A) They are easier to remove from factory exhaust than sulfur dioxide is.
B) They can sometimes be seen in the air as dust or smoke.
C) Particles that are less than 10 m in diameter are more dangerous than larger particles are.
D) Less than 10 of the counties in the United States have particle pollution levels that exceed the EPA's standards.
Question 2
An electrostatic precipitator is a device used
A) in the laboratory study of pollution.
B) to precipitate ions in water.
C) to remove particles from smokestack gases.
D) to remove CO2 from the atmosphere.
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