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In-car particulate matter exposure across ten global cities

Kumar, Prashant, Hama, Sarkawt, Nogueira, Thiago, Abbass, Rana Alaa, Brand, Veronika S., de Fatima Andrade, Maria, Asfaw, Araya, Aziz, Kosar Hama, Cao, Shi-Jie, El-Gendy, Ahmed , Islam, Shariful, Jeba, Farah, Khare, Mukesh, Mamuya, Simon Henry, Martinez, Jenny, Meng, Ming-Rui, Morawska, Lidia, Muula, Adamson S., S M, Shiva Nagendra, Ngowi, Aiwerasia Vera, Omer, Khalid, Olaya, Yris, Osano, Philip and Salam, Abdus (2020) In-car particulate matter exposure across ten global cities Science of The Total Environment, 141395.

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Cars are a commuting lifeline worldwide, despite contributing significantly to air pollution. This is the first global assessment on air pollution exposure in cars across ten cities: Dhaka (Bangladesh); Chennai (India); Guangzhou (China); Medellín (Colombia); São Paulo (Brazil); Cairo (Egypt); Sulaymaniyah (Iraq); Addis Ababa (Ethiopia); Blantyre (Malawi); and Dar-es-Salaam (Tanzania). Portable laser particle counters were used to develop a proxy of car-user exposure profiles and analyse the factors affecting particulate matter ≤2.5 μm (PM2.5; fine fraction) and ≤10 μm (PM2.5–10; coarse fraction). Measurements were carried out during morning, off- and evening-peak hours under windows-open and windows-closed (fan-on and recirculation) conditions on predefined routes. For all cities, PM2.5 and PM10 concentrations were highest during windows-open, followed by fan-on and recirculation. Compared with recirculation, PM2.5 and PM10 were higher by up to 589% (Blantyre) and 1020% (São Paulo), during windows-open and higher by up to 385% (São Paulo) and 390% (São Paulo) during fan-on, respectively. Coarse particles dominated the PM fraction during windows-open while fine particles dominated during fan-on and recirculation, indicating filter effectiveness in removing coarse particles and a need for filters that limit the ingress of fine particles. Spatial variation analysis during windows-open showed that pollution hotspots make up to a third of the total route-length. PM2.5 exposure for windows-open during off-peak hours was 91% and 40% less than morning and evening peak hours, respectively. Across cities, determinants of relatively high personal exposure doses included lower car speeds, temporally longer journeys, and higher in-car concentrations. It was also concluded that car-users in the least affluent cities experienced disproportionately higher in-car PM2.5 exposures. Cities were classified into three groups according to low, intermediate and high levels of PM exposure to car commuters, allowing to draw similarities and highlight best practices.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Nogueira, Thiago
Abbass, Rana Alaa
Brand, Veronika S.
de Fatima Andrade, Maria
Asfaw, Araya
Aziz, Kosar Hama
Cao, Shi-Jie
El-Gendy, Ahmed
Islam, Shariful
Jeba, Farah
Khare, Mukesh
Mamuya, Simon Henry
Martinez, Jenny
Meng, Ming-Rui
Morawska, Lidia
Muula, Adamson S.
S M, Shiva Nagendra
Ngowi, Aiwerasia Vera
Omer, Khalid
Olaya, Yris
Osano, Philip
Salam, Abdus
Date : 1 August 2020
Funders : University of Surrey, Research England, Institute of Advanced Studies
DOI : 10.1016/j.scitotenv.2020.141395
Grant Title : Global Challenge Research Fund (GCRF)
Copyright Disclaimer : © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Uncontrolled Keywords : Particulate matter; Transport mode; Commuters exposure; Developing countries; Exposure mitigation; CArE-Cities Project
Depositing User : Clive Harris
Date Deposited : 03 Aug 2020 17:16
Last Modified : 03 Aug 2020 17:16

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