Imperial College London
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Prof Benjamin Barratt

Faculty of Medicine, School of Public Health

Professor in Environmental Exposures and Public Health
 
 
 
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Contact

 

+44 (0)20 7594 2409b.barratt Website

 
 
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Location

 

UREN.1023Sir Michael Uren HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wang:2022:10.1016/j.scitotenv.2021.149931,
author = {Wang, J and Alli, AS and Clark, S and Hughes, A and Ezzati, M and Beddows, A and Vallarino, J and Nimo, J and Bedford-Moses, J and Baah, S and Owusu, G and Agyemang, E and Kelly, F and Barratt, B and Beevers, S and Agyei-Mensah, S and Baumgartner, J and Brauer, M and Arku, RE},
doi = {10.1016/j.scitotenv.2021.149931},
journal = {Science of the Total Environment},
title = {Nitrogen oxides (NO and NO2) pollution in the Accra metropolis: spatiotemporal patterns and the role of meteorology},
url = {http://dx.doi.org/10.1016/j.scitotenv.2021.149931},
volume = {803},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Economic and urban development in sub-Saharan Africa (SSA) may be shifting the dominant air pollution sources in cities from biomass to road traffic. Considered as a marker for traffic-related air pollution in cities, we conducted a city-wide measurement of NOx levels in the Accra Metropolis and examined their spatiotemporal patterns in relation to land use and meteorological factors. Between April 2019 to June 2020, we collected weekly integrated NOx (n = 428) and NO2 (n = 472) samples at 10 fixed (year-long) and 124 rotating (week-long) sites. Data from the same time of year were compared to a previous study (2006) to assess changes in NO2 concentrations. NO and NO2 concentrations were highest in commercial/business/industrial (66 and 76 μg/m3, respectively) and high-density residential areas (47 and 59 μg/m3, respectively), compared with peri-urban locations. We observed annual means of 68 and 70 μg/m3 for NO and NO2, and a clear seasonal variation, with the mean NO2 of 63 μg/m3 (non-Harmattan) increased by 25–56% to 87 μg/m3 (Harmattan) across different site types. The NO2/NOx ratio was also elevated by 19–28%. Both NO and NO2 levels were associated with indicators of road traffic emissions (e.g. distance to major roads), but not with community biomass use (e.g. wood and charcoal). We found strong correlations between both NO2 and NO2/NOx and mixing layer depth, incident solar radiation and water vapor mixing ratio. These findings represent an increase of 25–180% when compared to a small study conducted in two high-density residential neighborhoods in Accra in 2006. Road traffic may be replacing community biomass use (major source of fine particulate matter) as the prominent source of air pollution in Accra, with policy implication for growing cities in SSA.
AU  - Wang,J
AU  - Alli,AS
AU  - Clark,S
AU  - Hughes,A
AU  - Ezzati,M
AU  - Beddows,A
AU  - Vallarino,J
AU  - Nimo,J
AU  - Bedford-Moses,J
AU  - Baah,S
AU  - Owusu,G
AU  - Agyemang,E
AU  - Kelly,F
AU  - Barratt,B
AU  - Beevers,S
AU  - Agyei-Mensah,S
AU  - Baumgartner,J
AU  - Brauer,M
AU  - Arku,RE
DO  - 10.1016/j.scitotenv.2021.149931
PY  - 2022///
SN  - 0048-9697
TI  - Nitrogen oxides (NO and NO2) pollution in the Accra metropolis: spatiotemporal patterns and the role of meteorology
T2  - Science of the Total Environment
UR  - http://dx.doi.org/10.1016/j.scitotenv.2021.149931
UR  - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000709082400011&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
UR  - https://www.sciencedirect.com/science/article/pii/S0048969721050063
UR  - http://hdl.handle.net/10044/1/110136
VL  - 803
ER  -
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