US Tall Smokestacks Reduced Local Pollution but Spread Acid Rain Further
American power companies built towering smokestacks to disperse local air pollution away from nearby communities. The structures released sulfur dioxide and nitrogen oxides into higher atmospheric winds, which inadvertently spread acid rain across North America. The resulting acid rain caused significant damage to ecosystems throughout the region. In response, the US Congress amended the Clean Air Act to restrict the use of tall smokestacks. The revised legislation shifted focus toward capturing emissions at the source rather than dispersing them at height.
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