Which of the Following About Improvements in Air Quality Is

question 21

Multiple Choice

Which of the following about improvements in air quality is correct?

• A)Lead emissions have decreased greatly because of the use of catalytic converters which remove lead from vehicle exhaust.
• B)Sulfur dioxide emissions have decreased greatly because power plants were required to reduce their emissions which caused acid deposition.
• C)Carbon monoxide emissions have decreased greatly because carbon monoxide is destroyed by oxygen in the atmosphere.
• D)Ozone levels have decreased greatly because there is less nitrogen gas in the atmosphere.

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