Air Pollution

Meeting: 
MQT on 2016-03-16
Session date: 
March 16, 2016
Reference: 
2016/1195
Question By: 
Murad Qureshi
Organisation: 
Labour Group
Asked Of: 
The Mayor
Category: 

Question

How many days for every year since 2008 has London experienced "high" or "very high" air pollution episodes, as defined by the UK Air Quality Index?

Answer

Answer for Air Pollution

Answer for Air Pollution

Answered By: 
The Mayor

The Daily Air Quality Index has only been in place since 2012, so the data below is for 2012-2015 inclusive (please note that 2015 data is provisional and still to be ratified). The data has been supplied by Kings College London, and is based on the approximately 140 automatic monitors in the London Air Quality Network.

NO2 - hourly

There were 131 days when one site was high or very high for at least one hour, ten days when two sites were high or very high for an hour or more and two days when three sites were high or very high for an hour or more. There were no days when four or more sites were high or very high.

PM10 - daily (midnight to midnight)

There were 84 days when one or more site recorded high or very high. However, of these 49 were recorded at only one site, and ten at only two sites and four at only three sites.

PM2.5 - daily (midnight to midnight)

There were 25 days when one or more sites recorded high or very high.

The latest London Atmospheric Emissions Inventory (2013) has now been published on the London Datastore. This shows that overall NOx emissions reduced by 25% and PM10 emissions by 20% between 2008 and 2013. Further reductions are also expected from measures undertaken in my second term.