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URBAN AIR QUALITY

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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Fig. 1: London congestion.

David Burton / Alamy Stock Photo.

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Correspondence to Drew R. Gentner.

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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.

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Gentner, D.R., Xiong, F. Tracking pollutant emissions. Nature Geosci 10, 883–884 (2017). https://doi.org/10.1038/s41561-017-0027-y

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