Switch to diesel engines is significantly to blame for poor air quality in UK cities, experts sayhttp://www.bmj.com/content/348/bmj.g3033
PS. and here is the article:
Critical evaluation of the European diesel car boom – a global comparison, environmental effects and various national strategies. by Michel Cames and Eckhard Helmers.
Results: "Expected greenhouse gas savings initiated by the shift to diesel cars have been overestimated" and
"We conclude that the European diesel car boom did not cool down the atmosphere."
"Moreover, toxic NOx emissions of diesel cars have been undestimated up to 20-fold in officially announced date."
PS II. and here Clean Air in London (CAL) calls out Mayor Boris Johnson for his bad track record
Stop hiding air pollution and ban diesel exhaust in two stages to 2020 as coal was banned 60 years ago CAL regrets that the Mayor’s track record on similar schemes has been very poor. For example: i. delaying Phase 3 of Mayor Livingstone’s low emission zone from October 2010 to January 2012; ii. scrapping the western extension of the congestion charging zone despite adverse air pollution impacts expected; iii. 100% discount for diesel vehicles entering the CCCZ i.e. Greener Vehicle Discount that was recently scrapped because of the problems it created;- See more at: http://cleanairinlondon.org/hot-topics/stop-hiding-air-pollution-and-ban-diesel-exhaust-in-two-stages-to-2020-as-coal-was-banned-60-years-ago/#sthash.W8bg1erq.dpuf