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AEROSOL SCIENCE

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AIR POLLUTION

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BIOGRAPHY

Professor Chan obtained BSc in Chemical Engineering from the University of Texas at Austin in 1986 and PhD in Chemical Engineering from the California Institute of Technology in 1992. He is currently Dean and Chair Professor in School of Energy and Environment at City University of Hong Kong.  Before that, he was at the Hong Kong University of Science and Technology.


Professor Chan has over 30 years of research experience in air pollution and aerosol science.  He specializes in aerosol water uptake and phase transformation, gas-aerosol interactions, the formation of secondary aerosols in the atmosphere, and laser spectroscopy of aerosols.


Professor Chan received the Haagen Smit Award of Atmospheric Environment in 2015, Second Prize of the State Natural Science Award in 2010, and First Prize of the Natural Science Award in 2007. He was the first winner of the Asian Young Aerosol Scientists Award.  He was an Editor-in-Chief of Atmospheric Environment in 2008-2019.

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BEST PAPER AWARD IN

ENVIRONMENTAL SCIENCE AND TECHNOLOGY LETTERS IN 2019

Heterogeneous SO2 Oxidation in Sulfate Formation by Photolysis of Particulate Nitrate

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Masao Gen, Ruifeng Zhang, Dan Dan Huang, Yongjie Li, and Chak K. Chan

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We are very honored to receive this award and are grateful to the ESTL editors.  We also like to thank the reviewers of the paper who have given us many insightful comments and suggestions.

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NEWS AND UPDATES

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For older news and updates, please click the following button

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๐ˆ๐ง๐š๐œ๐ญ๐ข๐ฏ๐š๐ญ๐ข๐จ๐ง ๐จ๐Ÿ ๐„๐ฌ๐œ๐ก๐ž๐ซ๐ข๐œ๐ก๐ข๐š ๐œ๐จ๐ฅ๐ข ๐ข๐ง ๐๐ซ๐จ๐ฉ๐ฅ๐ž๐ญ๐ฌ ๐š๐ญ ๐๐ข๐Ÿ๐Ÿ๐ž๐ซ๐ž๐ง๐ญ ๐š๐ฆ๐›๐ข๐ž๐ง๐ญ ๐ซ๐ž๐ฅ๐š๐ญ๐ข๐ฏ๐ž ๐ก๐ฎ๐ฆ๐ข๐๐ข๐ญ๐ข๐ž๐ฌ: ๐„๐Ÿ๐Ÿ๐ž๐œ๐ญ๐ฌ ๐จ๐Ÿ ๐ฉ๐ก๐š๐ฌ๐ž ๐ญ๐ซ๐š๐ง๐ฌ๐ข๐ญ๐ข๐จ๐ง, ๐ฌ๐จ๐ฅ๐ฎ๐ญ๐ž ๐š๐ง๐ ๐œ๐ž๐ฅ๐ฅ ๐œ๐จ๐ง๐œ๐ž๐ง๐ญ๐ซ๐š๐ญ๐ข๐จ๐ง๐ฌ
๐‘โ„Ž๐‘Ž๐‘›๐‘๐‘œ๐‘›๐‘” ๐ฟ๐‘–๐‘Ž๐‘›๐‘”, ๐‘Š๐‘–๐‘›๐‘” ๐ฟ๐‘Ž๐‘š ๐ถโ„Ž๐‘Ž๐‘›, ๐‘‹๐‘–๐‘Ž๐‘œ๐‘š๐‘’๐‘›๐‘” ๐‘‡๐‘–๐‘Ž๐‘›, ๐ด๐‘™๐‘ฃ๐‘–๐‘› ๐ถ.๐พ. ๐ฟ๐‘Ž๐‘–, ๐‘ƒ๐‘Ž๐‘ก๐‘Ÿ๐‘–๐‘๐‘˜ ๐พ.๐ป. ๐ฟ๐‘’๐‘’, ๐ถโ„Ž๐‘Ž๐‘˜ ๐พ. ๐ถโ„Ž๐‘Ž๐‘›

13 May 2022

This paper builds on our experience in the physical chemistry of solution droplets to study the inactivation of bioaerosols in artificial saliva droplets at different ambient relative humidities (RH). We collaborate with ๐ƒ๐ซ. ๐๐š๐ญ๐ซ๐ข๐œ๐ค ๐‹๐ž๐ž (๐’๐„๐„) ๐š๐ง๐ ๐๐ซ๐จ๐Ÿ. ๐€๐ฅ๐ฏ๐ข๐ง ๐‹๐š๐ข (๐€๐‚๐„) as part of a Research Impact Fund project led by Alvin. Bacteria can be inactivated by increased osmotic stress and concentration of bactericidal substances at low RH. However, when the RH decreased to 50%, phase transition of the aqueous droplet, i.e., liquid to solid, occurred. The inactivation stopped because the effects of osmotic stresses and bactericidal substances no longer existed. Moderate relative humidity of ~60% affords the most effective inactivation of bacteria in droplets.ย In addition, high bacterial concentrations lowered the inactivation of bacteria, probably due to bacterial aggregation. The outer layers of bacteria could potentially shield the core bacteria from the osmotic stress and bactericidal effects.

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SELECTED NEW PUBLICATIONS

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PHOTOCHEMICAL REACTIONS OF GLYOXAL DURING PARTICULATE AMMONIUM NITRATE PHOTOLYSIS: BROWN CARBON FORMATION, ENHANCED GLYOXAL DECAY, AND ORGANIC PHASE FORMATION

Environmental Science & Technology

Ruifeng Zhang, Masao Gen, Zhancong Liang, Yong Jie Li, Chak K. Chan

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NITRITE/NITROUS ACID GENERATION FROM THE REACTION OF NITRATE AND FE(II) PROMOTED BY PHOTOLYSIS OF IRONโ€“ORGANIC COMPLEXES

Environmental Science & Technology (2021)

Masao Gen, Ruifeng Zhang, and Chak Chan

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EMISSIONS AND SECONDARY FORMATION OF AIR POLLUTANTS FROM MODERN HEAVY-DUTY TRUCKS IN REAL-WORLD TRAFFICโ€”CHEMICAL CHARACTERISTICS USING ON-LINE MASS SPECTROMETRY

Environment science & technology (2021)

Liyuan Zhou, Christian M. Salvador, Michael Priestley, Mattias Hallquist, Qianyun Liu, Chak K. Chan, and ร…sa M. Hallquist

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PRIMARY EMISSIONS AND SECONDARY PRODUCTION OF ORGANIC AEROSOLS FROM HEATED ANIMAL FATS

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NITRATE PHOTOLYSIS IN MIXED SUCROSEโ€“NITRATEโ€“SULFATE PARTICLES AT DIFFERENT RELATIVE HUMIDITIES

The Journal of Physical Chemistry A

Zhancong Liang, Ruifeng Zhang, Masao Gen, Yangxi Chu, Chak K. Chan

Production of Formate via Oxidation of G

PRODUCTION OF FORMATE VIA OXIDATION OF GLYOXAL PROMOTED BY PARTICULATE NITRATE PHOTOLYSIS

Environmental Science & Technology

Ruifeng Zhang, Masao Gen, Tzung-May Fu, Chak Keung Chan

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CONCLUDING REMARKS: FARADAY DISCUSSION ON AIR QUALITY IN MEGACITIES

Faraday Discussions

Masao Gen,ย Liyuan Zhou,ย Ruifeng Zhangย andย Chak K. Chan

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MULTIPHASE PHOTOCHEMISTRY OF IRON-CHLORIDE CONTAINING PARTICLES AS A
SOURCE OF AQUEOUS CHLORINE RADICALS AND ITS EFFECT ON SULFATE PRODUCTION

Environmental Science & Technology

Masao Gen, Ruifeng Zhang, Yong Jie Li, and Chak Keung Chan

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ENHANCED SULFATE PRODUCTION BY NITRATE PHOTOLYSIS IN THE PRESENCE OF HALIDE IONS IN ATMOSPHERIC PARTICLES

Environmental Science and Technology

Ruifeng ZHANG et al. (2020)

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PHD STUDENTS

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BEATRIX ROSETTE GOย MABATO

PhD Student in Energy and Environment

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MSc and BSc in Chemistry, University of Santo Tomas (Manila, PH)


Set currently focuses on the field of aerosol chemistry and air pollution. Among Setโ€™s research interests are aerosol uptake experiments, brown carbon formation, and atmospheric aging processes.

Image by Kamen Atanassov

ASSISTANT

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JO JO

Emotional Support Specialist

Joined in April 2019

7-8 years old

Specializing in emotional support

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Adopted from House of Joy and Mercy (้˜ฟๆฃๅฑ‹), Yuen Long, Hong Kong

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PREVIOUS MEMBERS

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DR. QIANYUN (CHERRIE) LIU

PhD in Environmental Science and Management, Hong Kong University of Science and Technology

Postdoctoral Fellow at CityU Hong Kong Shenzhen Research Institute (2019-2021)

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