A5064930291- Air Quality and Health Impacts
- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Vehicle emissions and performance
- Climate Change and Health Impacts
- Atmospheric Ozone and Climate
- Noise Effects and Management
- Toxic Organic Pollutants Impact
- COVID-19 impact on air quality
- Energy, Environment, and Transportation Policies
- Atmospheric and Environmental Gas Dynamics
- Health disparities and outcomes
- Environmental Policies and Emissions
- Global Health Care Issues
- Pharmacological Effects of Natural Compounds
- Natural product bioactivities and synthesis
- Ginseng Biological Effects and Applications
- activated carbon and charcoal
- Energy and Environmental Systems
- Epigenetics and DNA Methylation
- Advanced Aircraft Design and Technologies
- Pharmacy and Medical Practices
- CO2 Reduction Techniques and Catalysts
- Carcinogens and Genotoxicity Assessment
- Radioactivity and Radon Measurements
Imperial College London
2020-2025
MRC Centre for Environment and Health
2022-2025
NIHR Imperial Biomedical Research Centre
2025
Phenikaa University
2023-2024
Institute for Computational Science and Technology
2024
Van Lang University
2024
Ton Duc Thang University
2022
University of Birmingham
2015-2021
King's College London
2020
University of Ulsan
2010-2011
True air quality improvements during the COVID-19 lockdowns in global cities are more limited than we thought.
Abstract. A 5-year Clean Air Action Plan was implemented in 2013 to reduce air pollutant emissions and improve ambient quality Beijing. Assessment of this action plan is an essential part the decision-making process review its efficacy develop new policies. Both statistical chemical transport modelling have been previously applied assess plan. However, inherent uncertainties these methods mean that independent are required support assessment process. Here, we a machine-learning-based random...
The Beijing government implemented a number of clean air action plans to improve quality in the last 10 years, which contributed changes concentration fine particles and their compositions. However, quantifying impacts these interventions is challenging as meteorology masks real observed concentrations. Here, we applied machine learning technique decouple effect evaluate chemistry nonrefractory PM1 (particulate matter less than 1 μm) winter 2007, 2016, 2017 result actions. mass...
Abstract Aerosols produced from the oxidation of volatile/semi-volatile organic compounds (VOCs/SVOCs), known as secondary aerosol (SOA), account for a significant fraction atmospheric airborne particles. This paper reviews current understanding SOA formation gas-phase with focus on anthropogenic precursors and their reaction products simulation chamber studies. The review summarises major derived main groups (e.g., alkanes, aromatics), yields factors controlling formation. We highlight that...
Abstract. Measurements of OH, HO2, complex RO2 (alkene- and aromatic-related RO2) total radicals taken during the integrated Study AIR Pollution PROcesses in Beijing (AIRPRO) campaign central summer 2017, alongside observations OH reactivity, are presented. The concentrations were elevated, with reaching up to 2.8×107moleculecm-3, HO2 peaking at 1×109moleculecm-3 concentration 5.5×109moleculecm-3. reactivity (k(OH)) peaked 89 s−1 night, a minimum afternoon ≈22s-1 on average. An experimental...
Road traffic emissions are considered a major contributor to urban air pollution, but clean actions have led huge reduction in per vehicle. This raises pressing question on the potential further reduce road improve quality. Here, we analysed ~11 million real-world data estimate contribution of roadside and concentrations for several cities. Our results confirm that remains dominant source nitrogen dioxide significant primary coarse particulate matter European However, it now represents...
Abstract. Wintertime in situ measurements of OH, HO2 and RO2 radicals OH reactivity were made central Beijing during November December 2016. Exceptionally elevated NO was observed on occasions, up to ∼250 ppbv. The daily maximum mixing ratios for radical species varied significantly day-to-day over the ranges 1–8×106 cm−3 (OH), 0.2–1.5×108 (HO2) 0.3–2.5×108 (RO2). Averaged full observation period, mean daytime peak 2.7×106, 0.39×108 0.88×108 total RO2, respectively. main source new via...
Abstract. The Atmospheric Pollution and Human Health in a Chinese Megacity (APHH-Beijing) programme is an international collaborative project focusing on understanding the sources, processes health effects of air pollution Beijing megacity. APHH-Beijing brings together leading China UK research groups, state-of-the-art infrastructure quality models to work four themes: (1) sources emissions pollutants; (2) atmospheric affecting urban pollution; (3) exposure impacts; (4) interventions...
The physical properties of indoor particles were measured with an Scanning Mobility Particle Sizer (SMPS) system (14.6–850 nm), Aerodynamic (APS, 0.54–18 μm) and Hygroscopic Tandem Differential Analyzer (H-TDMA) in apartment located urban background site Prague (Czech Republic) from 15 August to 8 September, 2014. total particle maximum number concentration was 9.38 × 104, 1.46 105, 2.89 2.25 105 1.57 106 cm−3 for released vacuum cleaning, soap/W5 cleaning spray, smoking, incense burning...
Epidemiological studies have consistently linked exposure to PM2.5 with adverse health effects. The oxidative potential (OP) of aerosol particles has been widely suggested as a measure their toxicity. Several acellular chemical assays are now readily employed OP; however, uncertainty remains regarding the atmospheric conditions and specific components that drive OP. A limited number simultaneously utilised multiple OP wide range concurrent measurements investigated seasonality In this work,...
Abstract. This study presents the source apportionment of PM2.5 performed by positive matrix factorization (PMF) on data presented here which were collected at urban (Institute Atmospheric Physics – IAP) and rural (Pinggu PG) sites in Beijing as part Pollution Human Health a Chinese megacity (APHH-Beijing) field campaigns. The campaigns carried out from 9 November to 11 December 2016 22 May 24 June 2017. PMF analysis included both organic inorganic species, seven-factor output provided most...
This study explores the cobenefits of reduced nitrogen dioxide (NO2), ozone (O3), and particulate matter (PM), through net zero (NZ) climate policy in UK. Two alternative NZ scenarios, balanced (BNZP) widespread innovation (WI) pathways, from UK Climate Change Committee's Sixth Carbon Budget, were examined using a chemical transport model (CTM). Under existing policy, Business as Usual (BAU), reductions NO2 PM predicted by 2030 due to new vehicle technologies but plateau 2040. The BNZP WI...
Abstract. Fine particles were sampled from 9 November to 11 December 2016 and 22 May 24 June 2017 as part of the Atmospheric Pollution Human Health in a Chinese Megacity (APHH-China) field campaigns urban Beijing, China. Inorganic ions, trace elements, organic carbon (OC), elemental (EC), compounds, including biomarkers, hopanes, polycyclic aromatic hydrocarbons (PAHs), n-alkanes, fatty acids, determined for source apportionment this study. Carbonaceous components contributed on average 47.2...
Abstract. The international airport of Heathrow is a major source nitrogen oxides, but its contribution to the levels sub-micrometre particles unknown and objective this study. Two sampling campaigns were carried out during warm cold seasons at site close airfield (1.2 km). Size spectra largely dominated by ultrafine particles: nucleation ( < 30 nm) found be ∼ 10 times higher than those commonly measured in urban background environments London. Five clusters six factors identified...
Organic aerosol is one of the dominant components PM2.5 in megacities. In order to understand sources and formation processes aliphatic carbonyl compounds, concentrations saturated unsaturated hydrocarbons compounds were determined from an urban area Beijing sampled November–December 2016 analysed using two dimensional gas chromatography coupled time-of-flight mass spectrometry (GC x GC-TOFMS). The data separated into non-haze haze days (PM2.5 ≥ 75 μg m−3). n-Alkanes (C10-C36) n-alkenes...
Given that many people typically spend the majority of their time at home, accurate measurement and modelling home environment is critical in estimating exposure to air pollution. This study investigates fate impact on human outdoor indoor pollutants London homes, using a combination sensor measurements, pollution estimated from CMAQ-urban model mass balance models. Averaged concentrations PM2.5, PM10 NO2 were 14.6, 24.7 14.2 μg m−3 while 14.4, 22.6 21.4 m−3, respectively. Mean infiltration...
Accurate estimates of personal exposure to ambient air pollution are difficult obtain and epidemiological studies generally rely on residence-based estimates, averaged spatially temporally, derived from monitoring networks or models. Few have compared the associated health effects estimates. To evaluate association between cognitive function using taking mobility location into account. Residence-based dispersion model NO2, PM10 PM2.5 were assigned 768 London-dwelling participants English...