Duncan Laxen and Stephen Moorcroft refer to our failure to achieve reductions in nitrogen dioxide concentrations and relate this to the growth in the number of diesel cars combined with the lack of any improvement in diesel car emissions (Viewpoint LTT 18 Oct).
The situation is quite different in Tokyo where both overall nitrogen oxide and nitrogen dioxide levels are falling steadily, despite a rise in the nitrogen dioxide/nitrogen oxide ratio. The reason for this difference is the absence of...
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