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In page State Implementation Plan:

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In Ohio, between 1970 and 1977, a rule in the Clean Air Act required a reduction in the measured sulfur dioxide (SO2) emitted by coal-fired power plants. The State Implementation Plan to decrease the SO2 emitted by such plants was to increase the height of the smokestacks on the plants. The result was that the SO2 was carried in the wind out of the state and there was a reduction in the measured SO2 in the area near the source.[citation needed] In the 1977 amendments to the Act, Congress restricted the use of tall smokestacks as a means to attain compliance in SIPs.[1][2]