§ Mr. AllenTo ask the Secretary of State for the Environment what assessment he has made of the impact on the environment of those vehicle exhaust emissions which are capable of being reduced or eliminated by catalytic converters.
§ Mrs. Virginia BottomleyAssessing the contribution made by petrol driven vehicles to national levels of carbon monoxide, hydrocarbons, ozone and nitrogen oxides and their consequent environmental impact has been and continues to be a major part of the Department's air quality research programme.