Question

which of the following is an example of a primary pollutant?a ground-level ozoneb soot from smokec radond all of the above6. almost a third of americas air pollution comes froma heating homesb volcanoesc gasoline burned by vehiclesd agriculture7. activities such as construction and agriculture are primary sources ofa volatile organic compounds.b particulate matter.c hydrocarbons.d nitrogen oxides.8. this forms when a primary pollutant comes into contact with other primary pollutants or with naturally occurring substances such as water vapor and a chemical reaction takes place.a primary pollutantsb secondary pollutantsc tertiary pollutantsd quaternary pollutants

Explanation:

1. For the first question: Primary pollutants are emitted directly from sources. Ground-level ozone is a secondary pollutant, while soot from smoke and radon are primary. So not all are primary.
2. For question 6: Transportation (gasoline burned by vehicles) is a major source of U.S. air pollution, accounting for nearly a third of emissions.
3. For question 7: Construction and agriculture release small solid particles/droplets, which are classified as particulate matter.
4. For question 8: Secondary pollutants form when primary pollutants react with other substances or each other in the atmosphere.

Answer:

First question: B. soot from smoke, C. radon

1. C. Gasoline burned by vehicles
2. B. particulate matter.
3. B. Secondary pollutants