2The Mayor's Air Quality Strategy,www.london.gov.uk/mayor/ strategies/air-quality/index.jsp.
3Council Directive 96/62/EC of 27 September 1996 on ambient air quality assessment and management (1996/62/EC).europa.eu.int/comm/environment/air/ambient.htm.
4First Daughter Directive:Council Directive 1999/30/EC of 22 April 1999 relating to limit values for sulphur dioxide,nitrogen dioxide and oxides of nitrogen,particulate matter and lead in ambient air (1999/30/EC),amended by Commission Decision 2001/744/EC.europa.eu.int/comm/environment/air/ambient.btm.
