A5090352470- Indoor Air Quality and Microbial Exposure
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Noise Effects and Management
- Infection Control and Ventilation
- Building Energy and Comfort Optimization
- Fire dynamics and safety research
- Urban Heat Island Mitigation
- Odor and Emission Control Technologies
- Energy and Environment Impacts
- Plant responses to elevated CO2
- Atmospheric chemistry and aerosols
- Evacuation and Crowd Dynamics
- Vehicle emissions and performance
- Fire effects on ecosystems
- Urban Green Space and Health
- Carbon Dioxide Capture Technologies
- COVID-19 impact on air quality
- Wind and Air Flow Studies
- Fire Detection and Safety Systems
- Building materials and conservation
- Impact of Light on Environment and Health
- Conservation Techniques and Studies
- Toxic Organic Pollutants Impact
- COVID-19 and healthcare impacts
Portland State University
2015-2024
Singapore-MIT Alliance for Research and Technology
2014-2018
Nanyang Technological University
2014-2018
Rice University
2015
The University of Texas at Austin
2009-2013
Illinois Institute of Technology
2013
U.S. National Science Foundation
2011
Integrative Graduate Education and Research Traineeship
2011
Carpet and rugs currently represent about half of the United States flooring market offer many benefits as a type. How carpets influence our exposure to both microorganisms chemicals in indoor environments has important health implications but is not well understood. The goal this manuscript consolidate what known how carpet impacts chemistry microbiology, identify research gaps that remain. After describing current use indoors, questions focus on five specific areas: 1) chemistry, 2) 3)...
Much of human exposure to ambient ozone and reaction byproducts occurs inside buildings. However, there are currently no experimental data on the ability penetrate through building envelopes into residences. This paper presents a method determine penetration factor for in buildings, applies it an unoccupied test house seven single-family The mean (±SD) was measured as 0.79 ± 0.13 eight homes using this method, ranging from 0.62 0.09 1.02 0.15. An analysis tests across revealed that...
We conducted a series of experiments to evaluate the gas and particle removal effectiveness potential for byproduct formation resulting from operation commercially available in-duct bipolar ionization device. Laboratory tests were with ionizer installed in small air handler serving large semi-furnished chamber. Chamber under (i) normal operating conditions characterize impact on concentrations particles (0.01–10 μm), ozone (O3), nitrogen dioxide (NO2), volatile organic compounds (VOCs),...
There exists limited testing of air cleaners under indoor wildfire smoke conditions. This study characterized 13 cleaners, determining size-resolved particulate matter (PM), black and brown carbon, volatile organic compound (VOC) clean delivery rates (CADRs). Two do-it-yourself (DIY) configurations composed MERV filters affixed to a box fan proved effective at removing particles in the 1–2.5 μm diameter range with average CADRs 1467 842 m3/h, respectively. In contrast units HEPA filters, PM...
Indoor vegetation is often proposed as a passive approach for improving indoor air quality. While studies of outdoor environments indicate that can be an important sink ozone, there scant data in the literature concerning dynamics ozone uptake by plants. This study determined deposition velocities (vd) five common plants (Peace Lily, Ficus, Calathia, Dieffenbachia, Golden Pothos). The transient vd was calculated, using measured leaf areas each plant, exposures mimicking three diurnal cycles...
This study evaluated the interrelations between indoor and outdoor bioaerosols in a bedroom under living condition. Two wideband integrated bioaerosol sensors were utilized to measure particulate matter (PM) fluorescent biological airborne particles (FBAPs), which within size range of 0.5-20 μm. Throughout this one-month case study, median proportion FBAPs PM by number was 19% (5%; interquartile range, hereafter) 17% (3%) for indoors outdoors, respectively, those mass 78% (12%) 55% (9%)....
Wildfire smoke contains PAHs that, after infiltrating indoors, accumulate on indoor materials through particle deposition and partitioning from air. We report the magnitude persistence of select surface associated three common materials: glass, cotton, mechanical air filter media. Materials were loaded with both spiking standards exposure to a wildfire proxy. Loaded aged indoors over ∼4 months determine PAH persistence. For spiked standards, total decay rates 0.010 ± 0.002, 0.025 0.005,...
Introduction Humans have used wood as a construction material throughout history. Currently, mass timber products, such cross-laminated (CLT), are becoming more popular structural material, since they renewable and lower carbon footprint than concrete or steel. Nonetheless, some building types, healthcare, veterinary, food manufacturing, avoid using due to concerns about microbial growth in the event of wetting. One solution is use protective coatings on products increase moisture...
Models of reactive uptake ozone in indoor environments generally describe materials through aerial (horizontal) projections surface area, a potentially limiting assumption for porous materials. We investigated the effect changing porosity/pore size, material thickness, and chamber fluid mechanic conditions on to five materials: two cellulose filter papers, cementitious materials, an activated carbon cloth. Results include (1) porosity pore size distributions, (2) effective diffusion...