Estimating emission distribution within a vehicle fleet is critical for air pollution control. Previous studies reported that more than half of total fleet emissions were produced by only the highest 10% emitters, making repairing or deregistering a small percentage of high-emitters the most cost-effective measure to control vehicle emissions. With diesel emissions data from chassis dynamometer testing and on-road remote sensing, we show that such a strategy may be oversimplified.
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The data that support the findings of this study are available from the corresponding authors upon request.
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We thank the Hong Kong Environmental Protection Department for providing the chassis dynamometer testing and remote sensing data used in this study. The contents of this paper are solely the responsibility of the authors and do not necessarily represent official views of the Hong Kong SAR Government.
The authors declare no competing interests.
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Huang, Y., Surawski, N.C., Yam, Y. et al. Re-evaluating effectiveness of vehicle emission control programmes targeting high-emitters. Nat Sustain (2020). https://doi.org/10.1038/s41893-020-0573-y