Air quality time extension (1)

MQT on 2010-02-24
Session date: 
February 24, 2010
Question By: 
Darren Johnson
City Hall Greens
Asked Of: 
The Mayor


If a time extension is granted from 2010 to 2015 (or earlier) to comply with the limit value for nitrogen dioxide, the Government must ensure that the limit value plus maximum margin of tolerance is not exceeded from 1st January 2010 i.e. an annual mean concentration of 60 micrograms nitrogen dioxide per cubic metre. The UK will be subject to infraction action if this requirement is not met. Please therefore list all the monitoring sites belonging to the London Air Quality Network where annual mean concentrations of nitrogen dioxide exceeded 60 micrograms per cubic metre in 2008 and/or 2009 (using provisional figures where necessary), providing the percentage reduction required in order to comply with the limit value plus plus maximum margin of tolerance limit in 2010.


Answer for Air quality time extension (1)

Answer for Air quality time extension (1)

Answered By: 
The Mayor

The London Air Quality Network website (, which is administered by King's College London, contains data for all monitoring sites in London, including for the years 2008 and 2009. By clicking on the monitoring site shown on the interactive map, it is possible to view a range of data for that site, including concentrations of nitrogen dioxide.