HC Deb 06 July 1959 vol 608 c101W
98. Mr. Sorensen

asked the Minister of Transport and Civil Aviation what further action he is taking to mitigate the danger to health from the emission of black exhaust fumes and smoke from the increasing number of diesel-fed omnibuses and heavy vehicles on urban roads in London and elsewhere.

Mr. Watkinson

I understand it is not established that these fumes affect health. Nevertheless black smoke is objectionable generally and on grounds of safety and is an offence. Any further measures to reduce exhaust fumes must depend on research which is now being undertaken.

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