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Which of the following about improvements in air quality is correct?a. Ozone levels have decreased greatly because there is less nitrogen gas in the atmosphere.b. Carbon monoxide emissions have decreased greatly because carbon monoxide is destroyed by oxygen in the atmosphere.c. Lead emissions have decreased greatly because of the use of catalytic converters which remove lead from vehicle exhaust.d. Sulfur dioxide emissions have decreased greatly because power plants were required to reduce their emissions which caused acid deposition.

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