§ Wing Commander Bullusasked the Minister of Transport what progress he has made in his study on the control of emission of smoke and fumes from diesel engines; and if he intends to make any regulations.
§ Mr. MarplesA recent investigation, conducted by the Department of Scientific and Industrial Research, suggests that the nuisance of smoke from diesel engines is on some occasions caused mainly by its density and on others mainly by its volume. Thus it may be difficult to prescribe control standards and I do not at present intend to propose further regulations for this purpose.
Meanwhile, roadside checks are continuing throughout the country, and we are working on a specification for new diesel engines which will include provision against smoke.