Underestimated Ammonia Emissions from Road Vehicles

Naomi J. Farren; Jack Davison; Rebecca A. Rose; Rebecca L. Wagner; David C. Carslaw

doi:10.1021/acs.est.0c05839

Underestimated Ammonia Emissions from Road Vehicles

Naomi J. Farren, Jack Davison, Rebecca A. Rose, Rebecca L. Wagner, David C. Carslaw^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

In this study, we use comprehensive vehicle emission remote sensing measurements of over 230,000 passenger cars to estimate total UK ammonia (NH3) emissions. Estimates are made using "top-down"and "bottom-up"methods that demonstrate good agreement to within 1.1% for total fuel consumed or CO2 emitted. A central component of this study is the comprehensive nature of the bottom-up emission estimates that combine highly detailed remote sensing emission data with over 4000 km of 1 Hz real driving data. Total annual UK NH3 emissions from gasoline passenger cars are estimated to be 7.8 ± 0.3 kt from the bottom-up estimate compared with 3.0 ± 1.7 kt reported by the UK national inventory. An important conclusion from the analysis is that both methodologies confirm that gasoline passenger car NH3 emissions are underestimated by a factor of about 2.6 compared with the 2018 UK National Atmospheric Emissions Inventory. Furthermore, we find that inventory estimates of urban emissions of NH3 for passenger cars are underestimated by a factor of 17.

Original language	English
Pages (from-to)	15689–15697
Number of pages	9
Journal	Environmental Science and Technology
Volume	54
Issue number	24
Early online date	2 Dec 2020
DOIs	https://doi.org/10.1021/acs.est.0c05839
Publication status	Published - 15 Dec 2020

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© 2020 American Chemical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

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© 2020 American Chemical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.
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Cite this

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AU - Rose, Rebecca A.

AU - Wagner, Rebecca L.

AU - Carslaw, David C.

N1 - © 2020 American Chemical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

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Underestimated Ammonia Emissions from Road Vehicles

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