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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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Author information


  1. Department of Chemical & Environmental Engineering, Yale University, New Haven, CT, USA

    • Drew R. Gentner
    •  & Fulizi Xiong
  2. SEARCH (Solutions for Energy, Air, Climate and Health) Center, Yale University, New Haven, CT, USA

    • Drew R. Gentner
    •  & Fulizi Xiong
  3. School of Forestry and Environmental Sciences, Yale University, New Haven, CT, USA

    • 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.

Corresponding author

Correspondence to Drew R. Gentner.