1. London Councilshttp://www.londoncouncils.gov.uk
2. The Mayor's Air Quality Atrategyhttp://www.london.gov.uk/mayor/strategies/air_quality/
3. Traffic Management and Air Quality Research Programme Final Summary;Report to Department of Transport of UK.,2006
4. The Air Quality Standards Regulations 2007 No. 64. 2007http://www.legislation.gov.uk/si/si2007/uksi_20070064_en_1