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Name a major atmospheric pollution from the past that has been improved?

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  1. Freon 12 and other chlorofluorocarbons.


  2. Particulates - Smoke pollution from industrial and domestic coal used - significant changes resulted from teh Clean Air Act 1956 http://www.uea.ac.uk/env/cserge/pub/wp/g...

    http://en.wikipedia.org/wiki/Clean_Air_A...

    Lead in the atmosphere as a result of legislation and the introduction of "Lead Free" petrol
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