A5000612876- Air Quality and Health Impacts
- Vehicle emissions and performance
- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Thermochemical Biomass Conversion Processes
- Energy and Environment Impacts
- Catalytic Processes in Materials Science
- Advanced Combustion Engine Technologies
- Inhalation and Respiratory Drug Delivery
- Nanoparticles: synthesis and applications
- Noise Effects and Management
- Atmospheric aerosols and clouds
- Indoor Air Quality and Microbial Exposure
- Biodiesel Production and Applications
- Aerosol Filtration and Electrostatic Precipitation
- Recycling and Waste Management Techniques
- Combustion and flame dynamics
- Cyclone Separators and Fluid Dynamics
- Toxic Organic Pollutants Impact
- nanoparticles nucleation surface interactions
- Carbon Nanotubes in Composites
- Climate Change and Health Impacts
- Occupational exposure and asthma
- Effects and risks of endocrine disrupting chemicals
- Atmospheric Ozone and Climate
Lund University
2016-2025
Nanosc (Sweden)
2021-2022
University Hospital of Lausanne
2015
St. Josef Krankenhaus
2013
University of Minnesota
2008-2012
University of Copenhagen
2009
Aarhus University
2009
Japan External Trade Organization
2007
Växjö Kommun
2002-2004
Tulane University
1968
The atmospheric effects of soot aerosols include interference with radiative transfer, visibility impairment, and alteration cloud formation are highly sensitive to the manner by which is internally mixed other aerosol constituents. We present experimental studies show that particles acquire a large mass fraction sulfuric acid during aging, considerably altering their properties. Soot exposed subsaturated vapor exhibit marked change in morphology, characterized decreased mobility-based...
Abstract Background Residential wood combustion is now recognized as a major particle source in many developed countries, and the number of studies investigating negative health effects associated with smoke exposure currently increasing. The appliances use today provide highly variable conditions resulting large variations physicochemical characteristics emitted particles. These differences properties are likely to influence biological induced by Outline focus this review discuss present...
Climate change policies have stimulated a shift towards renewable energy sources such as biomass. The economic crisis of 2008 has also increased the practice household biomass burning it is often cheaper than using oil, gas or electricity for heating. As result, combustion becoming an important source air pollutants in European Union. This position paper discusses contribution to pollution levels Europe, and emerging evidence on adverse health effects products. Epidemiological studies...
The effects of atmospheric processing on soot particle morphology were studied in the laboratory using Differential Mobility Analyzer-Aerosol Particle Mass Analyzer (DMA-APM) and DMA-DMA (Tandem DMA) techniques. To simulate processing, combustion agglomerates altered by sulphuric acid vapor condensation, relative humidity (RH) cycling, evaporation water heating. Primary investigated properties mobility size mass. Secondary properties, derived from these, include effective density, fractal...
Airborne ultrafine particles (diameter <100 nm) are ubiquitous in the environment and have been associated with adverse health effects. The respiratory-tract deposition of these is fundamentally influenced by their hygroscopicity: ability to grow condensation water humid respiratory system. Ambient typically hygroscopic, varying degrees. This article investigates influence hygroscopicity, exercise level, gender, intersubject variability on size-dependent fine during spontaneous breathing....
The hygroscopic properties of submicron soot particles during internal mixing with gaseous sulfuric acid have been investigated using a combined tandem differential mobility analyzer (TDMA) and analyzer–aerosol particle mass (DMA‐APM) technique. Fresh exhibit no change in size at subsaturated conditions, whereas exposed to (10 9 –10 10 molecule cm −3 , 12 s contact time) experience significant changes increasing relative humidity (RH). DMA‐APM measurements reveal that all sizes H 2 SO 4...
Abstract. Gasoline vehicles have recently been pointed out as potentially the main source of anthropogenic secondary organic aerosol (SOA) in megacities. However, there is a lack laboratory studies to systematically investigate SOA formation real-world exhaust. In this study, from pure aromatic precursors, idling and cold start gasoline exhaust three passenger (EURO2–EURO4) were investigated with photo-oxidation experiments 6 m3 smog chamber. The carried down atmospherically relevant mass...
The aim was to identify relationships between combustion conditions, particle characteristics, and optical properties of fresh photochemically processed emissions from biomass combustion. conditions included nominal high burn rate operation individual phases a conventional wood stove. Low temperature pyrolysis upon fuel addition resulted in "tar-ball" type particles dominated by organic aerosol with an absorption Ångström exponent (AAE) 2.5-2.7 estimated Brown Carbon contributions 50-70% at...
Soot particle (black carbon) morphology is of dual interest, both from a health perspective and due to the influence soot on global climate. In this study, mass-mobility relationships, thus effective densities, agglomerates three types emitting sources were determined in situ by combining differential mobility analyzer (DMA) an aerosol mass (APM). High-resolution transmission electron microscopy was also used. The diesel engines, diffusion flame generators, tapered candles, operated under...
Diesel emissions are a major contributor to combustion-generated airborne ambient particles. To understand the role of diesel particulate on health effects, it is important predict actual dose deposited in human respiratory tract, with respect number, surface area and mass. This complicated by agglomerate nature some these In this study tract deposition fraction size range 10–500 nm, was determined for 10 healthy volunteers during both idling transient engine running conditions heavy duty...
In urban environments, airborne particles are continuously emitted, followed by atmospheric aging. Also, emitted elsewhere, transported winds, contribute to the aerosol. We studied effective density (mass-mobility relationship) and mixing state with respect of in central Copenhagen, wintertime. The results related particle origin, morphology, Using a differential mobility analyzer-aerosol mass analyzer (DMA-APM), we determined that diameter range 50–400 nm were two groups: porous soot...
Abstract. We have developed the novel Aerosol Dynamics, gas- and particle-phase chemistry model for laboratory CHAMber studies (ADCHAM). The combines detailed gas-phase Master Chemical Mechanism version 3.2 (MCMv3.2), an aerosol dynamics module (which considers acid-catalysed oligomerization, heterogeneous oxidation reactions in particle phase non-ideal interactions between organic compounds, water inorganic ions) a kinetic multilayer diffusion-limited transport of compounds gas phase,...
Time-resolved emissions of particulate polycyclic aromatic hydrocarbons (PAHs) and total organic matter (OA) from a wood log stove an adjusted pellet were investigated with high-resolution time-of-flight aerosol mass spectrometry (AMS). The highest OA found during the addition on glowing embers, that is, slow burning pyrolysis conditions. These contained about 1% PAHs (of OA). PAH fast under hot air starved combustion conditions, in both stoves. In latter case, contributed up to 40% OA,...
Traffic is one of the major sources harmful airborne particles worldwide. To relate exposure to adverse health effects it important determine deposition probability inhaled in human respiratory tract. The size-dependent 12−580 nm was measured with a novel setup 9 healthy subjects breathing by mouth on windward side busy street Copenhagen, Denmark. aerosol characterized both at curbside and, obtain background concentration, rooftop level. Particle hygroscopicity, key parameter affecting tract...
When multiple instruments are used in tandem it is possible to obtain more complete information on particle transport and physicochemical properties than can be obtained with a single instrument. This article discusses measurements which submicrometer particles classified according electrical mobility then characterized one or additional methods. Measurement combinations that summarized here include plus mass, aerodynamic (or vacuum aerodynamic) diameter, integrated multiangle light...
Biomass combustion contributes to the production of ambient particulate matter (PM) in rural environments as well urban settings, but relatively little is known about health effects these emissions. The aim this study was therefore characterize airway responses humans exposed wood smoke PM under controlled conditions. Nineteen healthy volunteers were both smoke, at a (PM2.5) concentration 224 ± 22 μg/m3, and filtered air for three hours with intermittent exercise. generated employing an...
Several diesel exhaust (DE) characteristics, comprising both particle and gas phase, recognized as important when linking with health effects, are not reported in human chamber exposure studies. In order to understand effects of DE on humans there is a need for better characterization performing The aim this study was determine quantify detailed characteristics during exposure. Additionally compare properties conducted exposures. A wide battery phase measurement techniques have been used...
Time-resolved particle emissions from a conventional wood stove were investigated with aerosol mass spectrometry to provide links between combustion conditions, emission factors, mixing state of refractory black carbon and implications for organic tracer methods. The addition new batch fuel results in low temperature pyrolysis as the heats up, resulting strong, short-lived, variable peaks aerosol-containing markers anhydrous sugars, such levoglucosan (fragment at m/z 60). Flaming dominated...
Abstract. The effect of fuel ethanol content (10, 85 and 100 %) on primary emissions subsequent secondary aerosol formation was investigated for a Euro 5 flex-fuel gasoline vehicle. Emissions were characterized during New European Driving Cycle (NEDC) using comprehensive set-up high time-resolution instruments. A detailed chemical composition the exhaust particulate matter (PM) studied soot particle mass spectrometer (SP-AMS), potential (PAM) chamber. For gaseous compounds, an increase in...
Abstract Background Diesel exhaust is carcinogenic and exposure to diesel particles cause health effects. We investigated the toxicity of designed have varying physicochemical properties in order attribute effects specific particle characteristics. Particles from three fuel types were compared at 13% engine intake O 2 concentration: MK1 ultra low sulfur (DEP13) two renewable fuels hydrotreated vegetable oil (HVO13) rapeseed methyl ester (RME13). Additionally, generated 9.7% (DEP9.7) 17%...
Compared to petroleum diesel, renewable diesel fuels and exhaust aftertreatment systems can reduce primary emissions that are hazardous human health the environment. Secondary aerosol which form upon atmospheric processing have, however, been less studied. This study aimed quantify impacts of replacing with (hydrotreated vegetable oil [HVO] rapeseed methyl ester [RME]) on secondary from a heavy-duty engine at different stages an system. Emission characterization was obtained by combining...