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Abstract
Climate change and air pollution are closely interlinked since carbon dioxide and air pollutants are co-emitted from fossil fuel combustion. Net Zero (NZ) policies aiming to reduce carbon emissions will likely bring co-benefits in air quality and associated health. However, it is unknown whether regional NZ policies alone will be sufficient to reduce air pollutant levels to meet the latest 2021 World Health Organisation (WHO) guidelines. Here, we carried out high resolution air quality modelling for in the West Midlands region, a typical metropolitan area in the UK, to quantify the effects of different NZ policies on air quality. Results show that NZ policies will significantly improve air quality in the West Midlands, with up to 6 μg m−3 (21%) reduction in annual mean NO2 (mostly through the electrification of vehicle fleet, EV) and up to 1.4 μg m−3 (12%) reduction in annual mean PM2.5 projected for 2030 relative to levels under a “business as usual” (BAU) scenario. Under BAU, 2030 PM2.5 concentrations in most wards would be below 10 μg m−3 whilst under the Net Zero scenario, those in all wards would be below 10 μg m−3. This means that the ward averages in the West Midlands would meet the UK PM2.5 of 10 μg m−3target a decade early under the Net Zero scenario. However, no ward-level-averaged annual mean PM2.concentrations meet the 2021 WHO Air Quality guideline level of 5 μg m−3 under any scenario. Similarly for NO2 only 18 wards (8% of the region's population) are predicted to have NO2 concentrations below the 2021 WHO guideline level (10 μg m−3). Decarbonisation policies linked to Net Zero deliver substantial regional air quality benefits, but are not in isolation sufficient to deliver clean air with air pollutant levels low enough to meet the 2021 WHO guidelines.
Original language | English |
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Article number | 116704 |
Number of pages | 10 |
Journal | Environmental Research |
Volume | 236 |
Early online date | 20 Jul 2023 |
DOIs | |
Publication status | Published - 1 Nov 2023 |
Bibliographical note
Funding Information:This work is financially supported by the UK's Natural Environment Research Council (NERC) COP-AQ project (grant number 2021GRIP02COP-AQ) and the UK's NERC WM-Air project (grant number NE /S003487/1).
Publisher Copyright:
© 2023
Keywords
- Air quality
- Climate change
- Environmental health inequality
- Net zero
- World health organisation
ASJC Scopus subject areas
- Biochemistry
- General Environmental Science
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West Midlands Air Quality Improvement Programme
Sevinc, D., Pope, F., Bloss, W., Chapman, L., Thomas, N., Shi, Z., Bartington, S., Bryson, J., Jowett, S., Muller, C., MacKenzie, R., Harrison, R., Ferranti, E. & Cai, X.
Natural Environment Research Council
1/01/19 → 31/12/24
Project: Research Councils
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UK-China Collaboration to Optimise net zero Policy options for Air Quality and health (COP-AQ)
Shi, Z., Harrison, R. & Bloss, W.
Natural Environment Research Council
19/11/21 → 31/03/22
Project: Research Councils