European Union is a progressive force in controlling pollution | Letters

In attributing the rise in air pollutants in London to the EU, Nigel Pollitt is being disingenuous (Letters, 6 June). As chairman of the UK Expert Panel on Air Quality Standards for a decade to 2002, I was regularly asked by journalists as to whether diesel or petrol vehicles were better, and always gave the same answer: it depends whether you wish to increase air pollution or to accelerate global climate change, since diesel was more efficient but also more polluting. Thus it would have been Ho