London Atmospheric Emission Inventory (2)

MQT on 2015-10-21
Session date: 
October 21, 2015
Question By: 
Stephen Knight
Liberal Democrats
Asked Of: 
The Mayor


Is your claim that London's air pollution has seen a reduction of 20 per cent in nitrogen oxides (NOx) and 50 per cent in particulate matter (PM) since 2008 borne out by "real world" measured concentrations of these dangerous pollutants?


Answer for London Atmospheric Emission Inventory (2)

Answer for London Atmospheric Emission Inventory (2)

Answered By: 
The Mayor

This statement is related to emissions. London's air quality is also affected by emissions from outside the area, and by both long and short-term variations in the weather. There are no locations where measured air quality is fully representative of emissions so a direct correspondence would not be expected.

London is now broadly compliant for Particulate Matter and meets legal limits for eight out of nine regulated pollutants. There has been a 12% reduction in measured NO2 concentrations since 2008 and a halving of the number of Londoners living in areas, which breach limit values for NO2.