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

Lookup NU author(s): Dr Anil Namdeo, Dr Paul Goodman



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


A key challenge in controlling Delhiā€™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 concentrations measured at sites within Delhi and the NCR.

Publication metadata

Author(s): Hama SML, Kumar P, Harrison R, Bloss WJ, Khare M, Mishra S, Namdeo A, Sokhi R, Goodman P, Sharma C

Publication type: Article

Publication status: Published

Journal: Sustainable Cities and Society

Year: 2019

Volume: 54

Print publication date: 01/03/2020

Online publication date: 23/12/2019

Acceptance date: 04/12/2019

Date deposited: 10/01/2020

ISSN (print): 2210-6707

ISSN (electronic): 2210-6715

Publisher: Elsevier BV


DOI: 10.1016/j.scs.2019.102003


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Funder referenceFunder name
Clean Air for Delhi Through Interventions, Mitigations and Engagement (CADTIME; NE/P016588/1) project;
Natural Environmental Research Council [grant number NE/P016510/1; NE/P016499/1]
Process analysis, observations and modelling - Integrated solutions for cleaner air for Delhi (PROMOTE; NE/P016391/1) project.