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Four-year assessment of ambient particulate matter and trace gases in the Delhi-NCR region of India

Hama, Sarkawt M. L., Kumar, Prashant, Harrison, Roy M., Bloss, William J., Khare, Mukesh, Mishra, Sumit, Namdeo, Anil, Sokhi, Ranjeet, Goodman, Paul and Sharma, Chhemendra (2020) Four-year assessment of ambient particulate matter and trace gases in the Delhi-NCR region of India Sustainable Cities and Society, 54, 102003.

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A key challenge in controlling Delhi’s air quality is a lack of clear understanding of the impacts of emissions from the surrounding National Capital Region (NCR). Our objectives are to understand the limitations of publicly available data, its utility to determine pollution sources across Delhi-NCR and establish seasonal profiles of chemically active trace gases. We obtained the spatiotemporal characteristics of daily-averaged particulate matter (PM10 and PM2.5) and trace gases (NOX,O3,SO2, and CO) within a network of 12 air quality monitoring stations located over 2000 km2 across Delhi-NCR from January 2014 to December 2017. The highest concentrations of pollutants, except O3, were found at Anand Vihar compared with lowest at Panchkula. A high homogeneity in PM2.5 was observed among Delhi sites as opposed to a high spatial divergence between Delhi and NCR sites. The bivariate polar plots and k-means clustering showed that PM2.5 and PM10 concentrations are dominated by local sources for all monitoring sites across Delhi-NCR. A consequence of the dominance of local source contributions to measured concentrations, except to one site remote from Delhi, is that it is not possible to evaluate the influence of regional pollution transport upon PM concentrations measured at sites within Delhi and the NCR from concentration measurements alone.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Hama, Sarkawt M.
Harrison, Roy M.
Bloss, William J.
Khare, Mukesh
Mishra, Sumit
Namdeo, Anil
Sokhi, Ranjeet
Goodman, Paul
Sharma, Chhemendra
Date : March 2020
Funders : Natural Environmental Research Council (NERC)
DOI : 10.1016/j.scs.2019.102003
Copyright Disclaimer : © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (
Uncontrolled Keywords : Megacity Delhi; Cluster analysis; Polar plots; Local sources; ASAP-Delhi project
Depositing User : Diane Maxfield
Date Deposited : 15 Jan 2020 13:04
Last Modified : 24 Dec 2020 02:08

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