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Ammonium Chloride Associated Aerosol Liquid Water Enhances Haze in Delhi, India br

Chen, Ying
•
Wang, Yu
•
Nenes, Athanasios  
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June 7, 2022
Environmental Science & Technology

The interaction between water vapor and atmos-pheric aerosol leads to enhancement in aerosol water content,which facilitates haze development, but its concentrations, sources,and impacts remain largely unknown in polluted urban environ-ments. Here, we show that the Indian capital, Delhi, which tops thelist of polluted capital cities, also experiences the highest aerosolwater yet reported worldwide. This high aerosol water promotessecondary formation of aerosols and worsens air pollution. Wereport that severe pollution events are commonly associated withhigh aerosol water which enhances light scattering and reducesvisibility by 70%. Strong light scattering also suppresses theboundary layer height on winter mornings in Delhi, inhibitingdispersal of pollutants and further exacerbating morning pollutionpeaks. We provide evidence that ammonium chloride is the largestcontributor to aerosol water in Delhi, making up 40% on average, and we highlight that regulation of chlorine-containing precursorsshould be considered in mitigation strategies.

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Type
research article
DOI
10.1021/acs.est.2c00650
Web of Science ID

WOS:000810684000034

Author(s)
Chen, Ying
•
Wang, Yu
•
Nenes, Athanasios  
•
Wild, Oliver
•
Song, Shaojie
•
Hu, Dawei
•
Liu, Dantong
•
He, Jianjun
•
Ruiz, Lea Hildebrandt
•
Apte, Joshua S.
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Date Issued

2022-06-07

Publisher

AMER CHEMICAL SOC

Published in
Environmental Science & Technology
Volume

56

Issue

11

Start page

7163

End page

7173

Subjects

Engineering, Environmental

•

Environmental Sciences

•

Engineering

•

Environmental Sciences & Ecology

•

air pollution

•

secondary inorganic aerosol

•

hygroscopicity

•

particulate matter

•

heterogeneous formation

•

outdoor air-pollution

•

particulate matter

•

organic aerosol

•

hygroscopic growth

•

submicron aerosol

•

gridded emissions

•

china

•

n2o5

•

parameterization

•

nitrate

Peer reviewed

REVIEWED

Written at

EPFL

Available on Infoscience
July 4, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/189051
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