What is the biggest cause of air pollution?

2. Which of the following release the most primary pollutants into the air?

Which of the following is a long-term health effect of air pollution?

Which of the following statements is true?

5. What are the two main components in acid precipitation?

A device used to clean exhaust gases before they exit an automobile’s tailpipe is called a(n)

Which of the following substances is a colorless, tasteless and odorless radioactive gas?

Normal precipitation has a pH of

A primary pollutant

A secondary pollutant

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