Letter: Don't leave the engine running

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Sir: Fumes from all stationary vehicles with running engines are noxious, those from petrol engines with catalytic converters in less than perfect condition or not fully warmed up being particularly bad. Round here, drivers who do not switch their engines off while waiting frequently compound their antisocial behaviour by committing the actual offence of getting out of their vehicles while the engine is on.

I can assure W A White (letter, 10 September) that warm or cold, and even in the dampest of ambient conditions, a diesel always starts as instantly as switching on a light.