A5000709516- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- Vehicle emissions and performance
- Atmospheric and Environmental Gas Dynamics
- Toxic Organic Pollutants Impact
- Atmospheric aerosols and clouds
- Mercury impact and mitigation studies
- Indoor Air Quality and Microbial Exposure
- Odor and Emission Control Technologies
- Water Quality Monitoring and Analysis
- Isotope Analysis in Ecology
- Ocean Acidification Effects and Responses
- Infection Control and Ventilation
- Noise Effects and Management
- Remote Sensing and Land Use
- Effects and risks of endocrine disrupting chemicals
- Marine and Coastal Ecosystems
- Plant responses to elevated CO2
- Microbial bioremediation and biosurfactants
- Fire Detection and Safety Systems
- Urban Heat Island Mitigation
- Building Energy and Comfort Optimization
- Wind and Air Flow Studies
Hong Kong Baptist University
2023-2025
Northeastern University
2025
Hong Kong Polytechnic University
2015-2023
Institute of Geochemistry
2021
Chinese Academy of Sciences
2021
Wuhan University
2015-2018
University of Hong Kong
2016
Hong Kong University of Science and Technology
2016
Tropospheric ozone threatens human health and crop yields, exacerbates global warming, fundamentally changes atmospheric chemistry. Evidence has pointed toward widespread increases in the troposphere, particularly surface is chemically complex difficult to abate. Despite past successes some regions, a solution new challenges of pollution warming climate remains unexplored. In this perspective, by compiling measurements at ∼4,300 sites worldwide between 2014 2019, we show emerging challenge...
Abstract. Over the past 10 years (2005–2014), ground-level O3 in Hong Kong has consistently increased all seasons except winter, despite yearly reduction of its precursors, i.e. nitrogen oxides (NOx = NO + NO2), total volatile organic compounds (TVOCs), and carbon monoxide (CO). To explain contradictory phenomena, an observation-based box model (OBM) coupled with CB05 mechanism was applied order to understand influence both locally produced regional transport. The simulation showed...
Abstract. In the summer of 2017, measurements ozone (O3) and its precursors were carried out at an urban site in Jinan, a central city North China Plain (NCP). A continuous O3 pollution event was captured during 4–11 August, with maximum hourly mixing ratio reaching 154.1 ppbv. Model simulation indicated that local photochemical formation regional transport contributed 14.0±2.3 18.7±4.0 ppbv h−1, respectively, to increase 09:00–15:00 LT (local time) this event. For formation, calculated OH...
Abstract. Marine atmosphere is usually considered to be a clean environment, but this study indicates that the near-coast waters of South China Sea (SCS) suffer from even worse air quality than coastal cities. The analyses were based on concurrent field measurements target pollutants and meteorological parameters conducted at suburban site (Tung Chung, TC) nearby marine (Wan Shan, WS) August November 2013. observations showed levels primary significantly lower WS those TC, while ozone (O3)...
Motor vehicle emissions are an important but poorly constrained source of secondary organic aerosol (SOA). Here, we investigated in situ SOA formation from urban roadside air Hong Kong during winter time using oxidation flow reactor (OFR), with equivalent atmospheric ranging several hours to days. The campaign-average mass enhancement OA, nitrate, sulfate, and ammonium upon OFR aging was 7.0, 7.2, 0.8, 2.6 μg m–3, respectively. To investigate the sources potential, performed multilinear...
Abstract. Hong Kong, as one of the densely populated metropolises in East Asia, has been suffering from severe photochemical smog past decades, though observed nitrogen oxides (NOx) and total volatile organic compounds (TVOCs) were significantly reduced. This study, based on observation data autumns 2007, 2013 2016, investigated ozone (O3) formation radical chemistry during three sampling periods Kong with aid a box model incorporating Master Chemical Mechanism (PBM–MCM). While simulated...
Chlorine atoms (Cl) are highly reactive and can strongly influence the abundances of climate air quality-relevant trace gases. Despite extensive research on molecular chlorine (Cl2), a Cl precursor, in polar atmosphere, its sources other regions still poorly understood. Here we report daytime Cl2 concentrations up to 1 ppbv observed coastal area Hong Kong, revealing large source (2.7 pptv s-1 at noon). Field laboratory experiments indicate that photodissociation particulate nitrate by...
Severe episodic air pollution blankets entire cities and regions have a profound impact on humans their activities. We compiled daily fine particle (PM2.5) data from 100 in five continents, investigated the trends of number, frequency, duration episodes, compared these with baseline trend pollution. showed that factors contributing to events are complex; however, long-term measures abate emissions all anthropogenic sources at times is also most efficient way reduce occurrence severe events....
As important regions of transition between land and sea, the three bay areas Bohai Bay (BHB), Hangzhou (HZB), Pearl River Estuary (PRE) in China often suffer from severe photochemical pollution despite scarce anthropogenic emissions. To understand causes high ozone (O3) concentrations, O3 episode days associated with special synoptic systems bays were identified via observations simulated by weather research forecasting coupled community multiscale air quality (WRF-CMAQ) model. It was...
Ground-level ozone (O3) has been an emerging air pollution in China and interacts with fine particulate matters (PM2.5). We synthesized observations of O3 its precursors two summer months 2020 at 10 sites the Zhejiang province, East simulated situ photochemistry. northeastern province was more serious than that southwest. The site-average daytime increment correlated well (R2 = 0.73) total reactivity volatile organic compounds (VOCs) carbon monoxide toward hydroxyl radical (OH) urban areas....
Abstract. Volatile organic compounds (VOCs) play a crucial role in the formation of tropospheric ozone (O3) and secondary aerosols. VOC emissions are generally considered to have larger uncertainties compared other pollutants, such as sulfur dioxide fine particulate matter (PM2.5). Although predictions O3 PM2.5 been extensively evaluated air quality modeling studies, there has limited reporting on evaluation VOCs, mainly due lack routine measurements at multiple sites. In this study, we...