@article{Kumar:2023:10.1016/j.scitotenv.2022.159315,
author = {Kumar, P and Zavala-Reyes, JC and Kalaiarasan, G and Abubakar-Waziri, H and Young, G and Mudway, I and Dilliway, C and Lakhdar, R and Mumby, S and Kosowski, MM and Pain, CC and Adcock, IM and Watson, JS and Sephton, MA and Chung, KF and Porter, AE},
doi = {10.1016/j.scitotenv.2022.159315},
journal = {Science of the Total Environment},
title = {Characteristics of fine and ultrafine aerosols in the London underground.},
url = {http://dx.doi.org/10.1016/j.scitotenv.2022.159315},
volume = {858},
year = {2023}
}

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TY  - JOUR
AB  - Underground railway systems are recognised spaces of increased personal pollution exposure. We studied the number-size distribution and physico-chemical characteristics of ultrafine (PM0.1), fine (PM0.1-2.5) and coarse (PM2.5-10) particles collected on a London underground platform. Particle number concentrations gradually increased throughout the day, with a maximum concentration between 18:00 h and 21:00 h (local time). There was a maximum decrease in mass for the PM2.5, PM2.5-10 and black carbon of 3.9, 4.5 and ~ 21-times, respectively, between operable (OpHrs) and non-operable (N-OpHrs) hours. Average PM10 (52 μg m-3) and PM2.5 (34 μg m-3) concentrations over the full data showed levels above the World Health Organization Air Quality Guidelines. Respiratory deposition doses of particle number and mass concentrations were calculated and found to be two- and four-times higher during OpHrs compared with N-OpHrs, reflecting events such as train arrival/departure during OpHrs. Organic compounds were composed of aromatic hydrocarbons and polycyclic aromatic hydrocarbons (PAHs) which are known to be harmful to health. Specific ratios of PAHs were identified for underground transport that may reflect an interaction between PAHs and fine particles. Scanning transmission electron microscopy (STEM) chemical maps of fine and ultrafine fractions show they are composed of Fe and O in the form of magnetite and nanosized mixtures of metals including Cr, Al, Ni and Mn. These findings, and the low air change rate (0.17 to 0.46 h-1), highlight the need to improve the ventilation conditions.
AU  - Kumar,P
AU  - Zavala-Reyes,JC
AU  - Kalaiarasan,G
AU  - Abubakar-Waziri,H
AU  - Young,G
AU  - Mudway,I
AU  - Dilliway,C
AU  - Lakhdar,R
AU  - Mumby,S
AU  - Kosowski,MM
AU  - Pain,CC
AU  - Adcock,IM
AU  - Watson,JS
AU  - Sephton,MA
AU  - Chung,KF
AU  - Porter,AE
DO  - 10.1016/j.scitotenv.2022.159315
PY  - 2023///
SN  - 0048-9697
TI  - Characteristics of fine and ultrafine aerosols in the London underground.
T2  - Science of the Total Environment
UR  - http://dx.doi.org/10.1016/j.scitotenv.2022.159315
UR  - https://www.ncbi.nlm.nih.gov/pubmed/36283528
UR  - http://hdl.handle.net/10044/1/100405
VL  - 858
ER  - 

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