What was the significance of the 1977 Amendments to the Clean Air Act regarding 'Prevention of Significant Deterioration' (PSD)?
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Correct answer: It protected areas with air quality that was already cleaner than federal standards
Before 1977, there was a fear that industries would move to clean-air regions to avoid strict regulations. The PSD program ensured that clean areas (like National Parks) would stay clean and not be degraded to the minimum federal level.
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