Do pollution masks really work? How cyclists are trying to filter out the filth

Description

More cyclists are using pollution masks in London due to the bad air quality in the city. According to research by King's over 9,000 deaths in 2010 could be attributed to air pollution. Professor Frank Kelly, Analytical Environmental Sciences said: "Masks come in a range of specifications from useless to pretty good for dealing with emission gases like nitrogen dioxide; better masks have activated charcoal filters. For particulate matter, some masks will filter out the larger particles but none will deal well with the ultra fine particles."

Period	6 Aug 2015
Held at	London Evening Standard, United Kingdom