Definition of the Clean Air Act from the Oxford Advanced Learner's Dictionary


the Clean Air Act

; NAmE
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(in Britain) any of a series of laws passed between 1956 and 1968 with the aim of making the air cleaner, especially by forbidding in certain areas the burning of any fuel that produces smoke. Before the first Clean Air Act of 1956, a mixture of smoke from coal fires and damp winter air produced the famous London smog (= smoke mixed with fog), which in some years caused the deaths of thousands of people.