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Tracking pollutant emissions

Progress in the post-combustion treatment of diesel vehicle exhaust has led to shifting proportions of the constituents of nitrogen oxides. Observations from 61 European cities suggest that the outlook on attaining NO2 standards is more optimistic than expected.

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Competing interests

D.R.G. and F.X. have externally funded research projects on low-cost air quality monitoring networks, and Yale University has licensed out their technology.

Correspondence to Drew R. Gentner.

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Fig. 1: London congestion.

David Burton / Alamy Stock Photo.