Outer London boroughs that should get help are Bexley, Bromley, Croydon, Enfield, Havering, Redbridge, Richmond upon Thames, Sutton and Waltham Forest.

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Luke Harwood, 18, from Havering, east London, was found by police on Monday near Broadmead Playing Fields in Woodford Green, north-east London.

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Bromley and Havering have the lowest proportion of pollution-related deaths in London, both 6.3%, but are still above the England average of 5.6%.

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