A5023114819- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Energy and Environment Impacts
- Atmospheric chemistry and aerosols
- Vehicle emissions and performance
- Noise Effects and Management
- Atmospheric aerosols and clouds
- Climate Change and Health Impacts
- Indoor Air Quality and Microbial Exposure
- Energy, Environment, and Transportation Policies
- Biosensors and Analytical Detection
- Infection Control and Ventilation
- Hybrid Renewable Energy Systems
- Particle Dynamics in Fluid Flows
- Inhalation and Respiratory Drug Delivery
- Advanced biosensing and bioanalysis techniques
- Social Acceptance of Renewable Energy
- Cyclone Separators and Fluid Dynamics
- Fire effects on ecosystems
- Aerosol Filtration and Electrostatic Precipitation
- Advanced Chemical Sensor Technologies
- Electric Vehicles and Infrastructure
- Electrochemical Analysis and Applications
- COVID-19 impact on air quality
- Occupational and environmental lung diseases
Colorado State University
2015-2024
University of Wyoming
2018
University of Arizona
2012
Research Triangle Park Foundation
2005-2009
Environmental Protection Agency
2005-2009
National Jewish Health
2006
University of Colorado Denver
2006
University of North Carolina at Chapel Hill
1999-2003
University of Vermont
1998
The release of metals and metal-containing compounds into the environment is a growing concern in developed developing countries, as human exposure to associated with adverse health effects virtually every organ system. Unfortunately, quantifying expensive; analysis costs using certified laboratories typically exceed $100/sample, making routine toxic cost-prohibitive for applications such occupational or environmental protection. Here, we report on simple, inexpensive technology potential...
Paper-based analytical devices (PADs) represent a growing class of elegant, yet inexpensive chemical sensor technologies designed for point-of-use applications. Most PADs, however, still utilize some form instrumentation such as camera quantitative detection. We describe here simple technique to render PAD measurements more and straightforward using the distance colour development detection motif. The so-called distance-based enables chemistries that are portable less resource intensive...
A microfluidic paper-based analytical device (μPAD) fabricated by wax printing was designed to assess occupational exposure metal-containing aerosols. This method employs rapid digestion of particulate metals using microliters acid added directly a punch taken from an air sampling filter. Punches were then placed on μPAD, and digested transported detection reservoirs upon addition water. These contained reagents for colorimetric Fe, Cu, Ni. Dried buffer components used set the optimal pH in...
Multiplexed detection of Ni, Cu, and Fe from particulate air pollution with paper-based microfluidic devices is described. Analysis simple, inexpensive, does not require any external instrumentation.
Particulate matter (PM) air pollution is a major health hazard. The effects of PM are closely linked to particle size, which governs its deposition in (and penetration through) the respiratory tract. In recent years, low-cost sensors that report concentrations for multiple-sized fractions (PM1.0, PM2.5, PM10) have proliferated everyday use and scientific research. However, knowledge how well these perform across full range reported size limited. Unfortunately, erroneous data can lead...
Abstract Climate forecasts predict an increase in frequency and intensity of wildfires. Associations between health outcomes population exposure to smoke from Washington 2012 wildfires were compared using surface monitors, chemical‐weather models, a novel method blending three information sources. The association particulate matter ≤2.5 μm diameter (PM 2.5 ) cardiopulmonary hospital admissions occurring 1 July 31 October was evaluated time‐stratified case‐crossover design. Hospital...
Microfluidic paper-based analytical devices (μPADs) are a versatile and inexpensive point-of-care (POC) technology, but their widespread adoption has been limited by slow flow rates the inability to carry out complex in field measurements. In present work, we investigate multilayer μPADs as means generate enhanced within self-pumping paper devices. Through optical electrochemical measurements, fluid dynamics investigated compared established theories μPADs. We demonstrate ∼145-fold increase...
Assessing personal exposure to air pollution has long proven challenging due technological limitations posed by the samplers themselves. Historically, wearable aerosol monitors have be expensive, noisy, and burdensome. The objective of this work was develop a new type monitor, an ultrasonic sampler (UPAS), overcome many in assessment. UPAS is time-integrated monitor that features novel micropump virtually silent during operation. A suite onboard environmental sensors integrated with pump...
Abstract We examine airborne transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) potential using a source-to-dose framework beginning with generation virus-containing droplets and aerosols ending virus deposition in the tract susceptible individuals. By addressing 4 critical questions, we identify both gaps questions answers having policy implications.
Familiarity with the use of face coverings to reduce risk respiratory disease has increased during coronavirus pandemic; however, recommendations for their outside pandemic remains limited. Here, we develop a modeling framework quantify potential health benefits wearing covering or respirator mitigate exposure particulate air pollution. This accounts wide range available and respirators, fit factors efficacy, pollution characteristics, exposure-response data. Our shows that N95 respirators...
Particulate matter (PM) air pollution has a significant impact on human morbidity and mortality; however, the mechanisms of PM-induced toxicity are poorly defined. A leading hypothesis states that airborne PM induces harm by generating reactive oxygen species in around tissues, to oxidative stress. We report here system employing microfluidic electrochemical sensor coupled directly particle-into-liquid sampler (PILS) measure aerosol activity an on-line format. The measurement is based...
Human exposure to particulate matter (PM) air pollution has been linked with respiratory, cardiovascular, and neurodegenerative diseases, in addition various cancers. Consistent among all of these associations is the hypothesis that PM induces inflammation oxidative stress affected tissue. Consequently, a variety assays have developed quantify activity as means characterize its ability induced stress. The vast majority rely on high-volume, fixed-location sampling methods due limitations...
Traffic-related air pollution is associated with increased mortality and morbidity, yet few studies have examined strategies to reduce individual exposure while commuting. The present study aimed quantify how choice of mode route type affects personal pollutants during We analyzed within-person difference in exposures multiple (black carbon (BC), monoxide (CO), ultrafine particle number concentration (PNC), fine particulate matter (PM2.5)) commutes between the home workplace for 45...
Abstract. Aerosol emissions from biofuel combustion impact both health and climate; however, while reducing through improvements to technologies will improve health, the net effect on climate is largely unconstrained. In this study, we examine sensitivities in global aerosol concentration, direct radiative effect, cloud-albedo indirect uncertainties emission factors, optical mixing state, model nucleation background secondary organic (SOA). We use Goddard Earth Observing System...
Metal contamination of natural and drinking water systems poses hazards to public environmental health. Quantifying metal concentrations in typically requires sample collection the field followed by expensive laboratory analysis that can take days weeks obtain results. The objective this work was develop a low-cost, field-deployable method quantify trace levels copper coupling solid-phase extraction/preconcentration with microfluidic paper-based analytical device. This has advantages being...
Cookstoves emit many pollutants that are harmful to human health and the environment. However, most of existing scientific literature focuses on fine particulate matter (PM2.5) carbon monoxide (CO). We present an extensive data set speciated air pollution emissions from wood, charcoal, kerosene, liquefied petroleum gas (LPG) cookstoves. One-hundred twenty gas- particle-phase constituents—including organic carbon, elemental (EC), ultrafine particles (10–100 nm), inorganic ions, carbohydrates,...
Growing evidence links household air pollution exposure from biomass cookstoves with elevated blood pressure. We assessed cross-sectional associations of 24-hour mean concentrations personal and kitchen fine particulate matter (PM2.5 ), black carbon (BC), stove type pressure, adjusting for confounders, among 147 women using traditional or cleaner-burning Justa stoves in Honduras. investigated effect modification by age body mass index. Traditional users had (standard deviation) PM2.5 126...
This study investigated the role of microenvironment on personal exposures to black carbon (BC), fine particulate mass (PM2.5), monoxide (CO), and particle number concentration (PNC) among adult residents Fort Collins, Colorado, USA. Forty-four participants carried a backpack containing monitoring instruments for eight nonconsecutive 24-hour periods. Exposures were apportioned into five microenvironments: Home, Work, Transit, Eateries, Other. Personal exhibited wide heterogeneity that was...