MULTIPLE CHOICE 7. Which is a secondary air pollutant? a. ozone
b. carbon monoxide c. particulate matter d. nitrogen oxides
8. Volatile organic compounds
a. are tiny particles of liquid or solid matter.
b. are produced by chemical interactions between sulfur and oxygen. c. are an odorless, colorless poisonous gas.
d. are organic chemicals that form toxic fumes.
9. Which device helps clean car exhaust? a. electrostatic precipitator
b. scrubber
c. catalytic converter d. ZEV
10. Which pair below are the two main sources of air pollution in urban areas? a. vehicles, volcanoes
b. vehicles, industries c. industries, agriculture d. none of the above