It was taken yesterday.
Under EU and UK air quality legislation, daily mean concentrations of PM10 cannot exceed 50 mg/m3 on more than 35 days in a calendar year.
It already has.
That's right, the whole of the 2011 'allowance' for poor air quality (an allowance that is already 200% that recommended by the World Health Organisation) has been exceeded before the end of April.
It's caused by vehicles, particularly diesel vehicles. The majority of vehicles in London are diesel vehicles. Enough said, now let's use the congestion charge to fix this by increasing the disincentive to pollute from £8 to £25 per day; and in 3 years, ban all vehicles > 99g CO2 / km; or implement a vehicle registration lottery like Beijing (see post below this one).
