HC Deb 12 July 1961 vol 644 c51W
Mr. F. Noel-Baker

asked the Minister of Transport if he has now decided which smoke meter to use in measuring fumes emitted from diesel-engined motor vehicles; and when he proposes to introduce it.

Mr. Marples

No existing smoke meter has yet proved itself to be suitable for enforcement purposes. My Department is hoping to develop a standard test procedure involving the use of a smoke meter for roadside enforcement, but a considerable amount of experiment will be necessary.

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