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Name the three pollutants that have decreased the most since 1990.
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Name the three pollutants that have decreased the most since 1990.

User Deserie
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1 vote
Lead, carbon monoxide, and sulfur dioxide have decreased the most since 1990.
User Sreejith Menon
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6.8k points
6 votes
They vary but lead, carbon monoxide, and sulfur dioxide are some of the most common ones that have decreased the most
User Hosack
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