Hajmohammadi, Hajar;
Heydecker, Benjamin;
(2022)
Evaluation of the London Ultra-Low Emission Zone by State-Space Modelling.
Atmospheric Pollution Research
, 13
(8)
, Article 101514. 10.1016/j.apr.2022.101514.
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Abstract
In April 2019, an ultra-low emission zone (uLEZ) was implemented in London to tackle road transport air pollution. In this study, a state-space intervention model is developed for the first time to quantify the effects of this policy on London air quality. For developing this model, hourly NO, NO2, and NOx concentrations at 28 monitoring stations across London for 12 months before the uLEZ intervention and 11 months following it were used. Additionally, this model accounts for the influences of the meteorological variables of temperature, wind speed, and humidity, as well as those of the day of the week and calendar month. The results of this model showed the uLEZ intervention was successful in reducing NO, NO2, and NOx concentrations not just within the zone of implementation but also throughout the wider low emission zone (LEZ) and Greater London area. This intervention made the greatest reduction in NO and NOx in the uLEZ area (19% and 20%, respectively), followed by the LEZ (18% and 17%) and then Greater London (11% and 15%). The reduction in NO2 in the uLEZ and LEZ is similar (11%–12%), with a larger reduction elsewhere in the Greater London area (13%).
| Type: | Article |
|---|---|
| Title: | Evaluation of the London Ultra-Low Emission Zone by State-Space Modelling |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.apr.2022.101514 |
| Publisher version: | https://doi.org/10.1016/j.apr.2022.101514 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | State-space modelling, Ultra-low emission zone, Air quality analysis |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10153070 |
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