Since the ____________________ of 1970, emissions of most pollutants have fallen off substantially, with lead showing the greatest reduction, primarily due to the elimination of leaded gasoline.

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The Answer of Since the ____________________ of 1970, emissions of most pollutants have fallen off substantially, with lead showing the greatest reduction, primarily due to the elimination of leaded gasoline.

Since the ____________________ of 1970, Emissions of Most Pollutants Have