A5046587804- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Astro and Planetary Science
- Infection Control and Ventilation
- Catalytic Processes in Materials Science
- Atmospheric aerosols and clouds
- Climate Change and Health Impacts
- Water Quality Monitoring and Analysis
- COVID-19 epidemiological studies
- Indoor Air Quality and Microbial Exposure
- Building Energy and Comfort Optimization
- Advanced oxidation water treatment
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Spectroscopy and Laser Applications
- Sperm and Testicular Function
- Energy and Environment Impacts
- Vehicle emissions and performance
- Occupational and environmental lung diseases
- Carbon Dioxide Capture Technologies
- Odor and Emission Control Technologies
Huazhong Agricultural University
2024-2025
Ministry of Agriculture and Rural Affairs
2025
Tohoku University
2025
Cooperative Institute for Research in Environmental Sciences
2015-2024
University of Colorado Boulder
2015-2024
Guangzhou University of Chinese Medicine
2021-2024
Foshan Maternity and Child Health Care Hospital
2022-2024
Guangdong Provincial Hospital of Traditional Chinese Medicine
2024
Guangzhou University
2024
Colorado State University
2023
CO2 is co-exhaled with aerosols containing SARS-CoV-2 by COVID-19-infected people and can be used as a proxy of concentrations indoors. Indoor measurements low-cost sensors hold promise for mass monitoring indoor aerosol transmission risk COVID-19 other respiratory diseases. We derive analytical expressions CO2-based proxies apply them to various typical environments. The relative infection in given environment scales excess level, thus, keeping low feasible space allows optimization the...
Rationale: Short-term exposure to air pollution has been associated with asthma exacerbation and increased healthcare use caused by asthma, but its effect on mortality remains largely unknown.Objectives: To quantitatively assess the association between short-term mortality.Methods: We investigated 4,454 individuals who lived in Hubei province, China, died from 2013 2018. A case-crossover design conditional logistic regression models were applied for data analyses. Exposures particulate...
Oxidation flow reactors (OFRs) containing low-pressure mercury (Hg) lamps that emit UV light at both 185 and 254 nm ("OFR185") to generate OH radicals O3 are used in many areas of atmospheric science pollution control devices. The widely potential aerosol mass (PAM) OFR was designed for studies on the formation oxidation secondary organic aerosols (SOA), allowing a wide range oxidant exposures short experiment duration with reduced wall loss effects. Although fundamental photochemical...
Abstract. An oxidation flow reactor (OFR) is a vessel inside which the concentration of chosen oxidant can be increased for purpose studying SOA formation and aging by that oxidant. During BEACHON-RoMBAS (Bio-hydro-atmosphere interactions Energy, Aerosols, Carbon, H2O, Organics & Nitrogen–Rocky Mountain Biogenic Aerosol Study) field campaign, ambient pine forest air was oxidized OH radicals in an OFR to measure amount could formed from real mix precursor gases, how changed with time...
Some infectious diseases, including COVID-19, can undergo airborne transmission. This may happen at close proximity, but as time indoors increases, infections occur in shared room air despite distancing. We propose two indicators of infection risk for this situation, that is, relative parameter (Hr) and (H). They combine the key factors control disease transmission indoors: virus-containing aerosol generation rate, breathing flow masking its quality, ventilation aerosol-removal rates, number...
Abstract. Oxidation flow reactors (OFRs) using low-pressure Hg lamp emission at 185 and 254 nm produce OH radicals efficiently are widely used in atmospheric chemistry other fields. However, knowledge of detailed OFR is limited, allowing speculation the literature about whether some non-OH reactants, including several not relevant for tropospheric chemistry, may play an important role these OFRs. These reactants UV radiation, O(1D), O(3P), O3. In this study, we investigate relative...
Abstract. Field studies in polluted areas over the last decade have observed large formation of secondary organic aerosol (SOA) that is often poorly captured by models. The study SOA using ambient data confounded effects advection, vertical mixing, emissions, and variable degrees photochemical aging. An oxidation flow reactor (OFR) was deployed to real-time during California Research at Nexus Air Quality Climate Change (CalNex) campaign Pasadena, CA, 2010. A high-resolution mass spectrometer...
Abstract. Oxidation flow reactors (OFRs) using OH produced from low-pressure Hg lamps at 254 nm (OFR254) or both 185 and (OFR185) are commonly used in atmospheric chemistry other fields. OFR254 requires the addition of externally formed O3 since is photolysis, while OFR185 does not O2 can be photolyzed to produce O3, also H2O photolysis. In this study, we use a plug-flow kinetic model investigate OFR properties under very wide range conditions applicable field laboratory studies. We show...
Abstract. Isoprene-epoxydiols-derived secondary organic aerosol (IEPOX-SOA) can contribute substantially to (OA) concentrations in forested areas under low NO conditions, hence significantly influencing the regional and global OA budgets, accounting, for example, 16–36 % of submicron southeastern United States (SE US) summer. Particle evaporation measurements from a thermodenuder show that volatility ambient IEPOX-SOA is lower than bulk also much known monomer tracer species, indicating...
KinSim is a research-grade, interactive, user-friendly, open-source, and visual software for kinetics modeling of environmental chemistry other applications. Students without any computer-programming background limited knowledge can use KinSim, which also includes multiple features functionality dedicated to reducing users' workload preventing users from creating errors in modeling; thus, particularly suitable in-classroom homework teaching choose several preprogrammed mechanisms initial...
What is the relationship between abnormal BMI and semen quality?Underweight was significantly associated with lower sperm concentration, total number motile count, while overweight volume, count.Abnormal has been quality, but results remain somewhat controversial. In addition, most previous studies have focused on influence of obesity or evidence association underweight quality rare.This research an observational study investigating 3966 donors from a large bank in Wuhan city, China. These...
Abstract The partitioning of low- and semi-volatile organic compounds into out particles significantly influences secondary aerosol formation evolution. Most atmospheric models treat as an equilibrium between gas particle phases, despite few direct measurements a large range uncertain mass accommodation coefficients (α). Here we directly measure the dynamic, isothermal specific using spectrometry in Teflon chamber. Measurements are conducted under dry humid conditions seeds different...
Ambient fine particulate matter (PM2.5) exposure has been linked to decreased semen quality, but the associations between PM2.5 constituent exposures and quality remain unknown. We enrolled 1081 men whose partners underwent assisted reproductive technology procedures in Wuhan, China 2014-2015, examined their quality. Daily average concentrations of constituents including 10 metals/metalloid elements 4 water-soluble ions were continuously determined for 1 week per month at 2 fixed monitoring...
Oxygenated volatile organic compounds (OVOCs) and secondary aerosol (SOA) formation potential of ambient air in Guangzhou, China was investigated using a field-deployed oxidation flow reactor (OFR). The OFR used to mimic hours weeks atmospheric exposure hydroxyl (OH) radicals within the 2–3 min residence time. A comprehensive investigation on variation VOCs OVOCs as function OH is shown. Substantial acids nitrogen-containing OVOC species were observed. Maximum SOA observed following 1–4...
Lamps emitting at 222 nm have attracted recent interest for germicidal ultraviolet disinfection ("GUV222"). Their impact on indoor air quality is considered negligible. In this study, ozone formation observed eight different lamps from five manufacturers, in amounts an order of magnitude larger than previous reports. Most produce O3 close to the first-principles calculation, with, e.g., a generation rate 22 ppb h–1 Ushio B1 modules 21 m3 chamber. Much more produced by when optical filters...
Semen quality is a vital determinant for male fertility. The process of spermatogenesis highly sensitive to fluctuations in temperature. However, the impact ambient temperature on semen remains unclear. We aimed quantitatively assess association between and quality. Using data from Hubei provincial human sperm bank Wuhan, China, we conducted longitudinal study including 10 802 volunteers who lived Wuhan passed initial physical examination donation Mar 27, 2013 April 9, 2018. parameters...
Abstract. Oxidation flow reactors (OFRs) are a promising complement to environmental chambers for investigating atmospheric oxidation processes and secondary aerosol formation. However, questions have been raised about how representative the chemistry within OFRs is of that in troposphere. We investigate fates organic peroxy radicals (RO2), which play central role chemistry, by chemical kinetic modeling compare variety ambient conditions help define range atmospherically relevant OFR...
Abstract. Secondary organic aerosol derived from isoprene epoxydiols (IEPOX-SOA) is thought to contribute the dominant fraction of total SOA, but current volatility-based lumped SOA parameterizations are not appropriate represent reactive uptake IEPOX onto acidified aerosols. A full explicit modeling this chemistry however computationally expensive owing many species and reactions tracked, which makes it difficult include in chemistry–climate models for long-term studies. Here we present...
Air disinfection using germicidal ultraviolet light (GUV) has received increasing attention during the COVID-19 pandemic. GUV uses UVC lamps to inactivate microorganisms, but it also initiates photochemistry in air. However, GUV's indoor-air-quality impact not been investigated detail. Here, we model chemistry initiated by at 254 ("GUV254") or 222 nm ("GUV222") a typical indoor setting for different ventilation levels. Our analysis shows that GUV254, usually installed upper room, can...