The Observer, 24 January 2016 (text in bold not published):
Your headline about air quality illustrates the abject failure of the Government to control pollution levels nationally (Shock figures to reveal deadly toll of global air pollution Jan 17)).
Last March the Supreme Court required the Government to produce an action plan, but nothing much has been forthcoming apart from extending low emission zones. Laboratory measurements of NOx pollution from cars bears so little relationship to emissions on the road that some cars emit more pollution than lorries, so it is hardly surprising that banning lorries from city centres has proven ineffective Furthermore studies on children’s lung function published in the Lancet recently has demonstrated that the government’s low emission strategy is of no benefit to children’s health, so why does it insist on pursuing a failed policy?
The only rational response is to stop producing diesel cars and to limit access to city centres for all diesel-powered vehicles. Instead London’s mayor Boris Johnson capitulated over emissions from old diesel taxis under pressure from London cabbies.
Dr Robin Russell-Jones