Catalytic converters still fail to dent urban NO2 levels

The introduction of catalytic converters has yet to deliver any reduction in urban nitrogen dioxide levels, according to a survey for the Department of Environment, Transport and the Regions.1 Some 80% of kerbside sites were at risk of breaching the statutory air quality objective for NO2.

The annual survey of urban NO2 concentrations, carried out for the DETR by AEA Technology, draws on data from more than 1,200 local authority monitoring sites using diffusion tubes. The first three surveys showed no improvement in NO2 levels between 1993-95, despite the mandatory introduction of catalytic converters on new cars from the start of 1993 (ENDS Report 266, pp 10-11 

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