A5086290778- Air Quality and Health Impacts
- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Vehicle emissions and performance
- Nanoparticles: synthesis and applications
- Recycling and Waste Management Techniques
- Catalytic Processes in Materials Science
- Energy and Environment Impacts
- Advanced Combustion Engine Technologies
- Toxic Organic Pollutants Impact
- Wind and Air Flow Studies
- Graphite, nuclear technology, radiation studies
- Advanced Aircraft Design and Technologies
- Graphene and Nanomaterials Applications
- Zeolite Catalysis and Synthesis
- Advanced Chemical Sensor Technologies
- Occupational and environmental lung diseases
- Environmental Policies and Emissions
- Pickering emulsions and particle stabilization
- Municipal Solid Waste Management
- Radioactivity and Radon Measurements
- Adsorption, diffusion, and thermodynamic properties of materials
- Transportation Systems and Safety
Swiss Federal Laboratories for Materials Science and Technology
2014-2021
ETH Zurich
2017-2021
University of California, Davis
2010-2020
Laboratoire de Physico-Chimie de l'Atmosphère
2013-2020
Centre National de la Recherche Scientifique
2015
École des Mines de Douai
2013-2015
École Normale Supérieure - PSL
2015
Centre de recherche Inria Lille - Nord Europe
2013-2014
IMT Nord Europe
2013-2014
University of Geneva
2009-2011
Abstract. New pathways to form secondary organic aerosol (SOA) have been postulated recently. Glyoxal, the smallest dicarbonyl, is one of proposed precursors. It has both anthropogenic and biogenic sources, readily partitions into aqueous phase cloud droplets deliquesced particles where it undergoes reversible irreversible chemistry. In this work we extend regional scale chemistry transport model WRF-Chem include detailed gas-phase glyoxal formation as well a state-of-the-science module...
Environmental contextAqueous-phase processes in fogs and clouds can significantly alter atmospheric fine particles with consequences for climate human health. We studied the influence of fog rain on aerosol properties, show that aqueous-phase reactions contribute to production secondary species change composition microphysical properties aerosols. In contrast, rains effectively remove aerosols reduce their concentrations. AbstractSubmicrometre (PM1) were characterised situ a high resolution...
Organic aerosols (OA) were studied in Fresno, California, winter 2010 with an Aerodyne High Resolution Time‐of‐Flight Aerosol Mass Spectrometer (HR‐ToF‐AMS). OA dominated the submicron aerosol mass (average = 67%) average concentration of 7.9 μ g m −3 and a nominal formula C 1 H 1.59 N 0.014 O 0.27 S 0.00008 , which corresponds to organic mass‐to‐carbon ratio 1.50. Three primary (POA) factors one oxygenated factor (OOA) representative secondary (SOA) identified via Positive Matrix...
Abstract. An Aerodyne high resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) was deployed during the Carbonaceous Aerosols and Radiative Effects Study (CARES) that took place in northern California June 2010. We present results obtained at Cool (denoted as T1 site of project) foothills Sierra Nevada Mountains, where intense biogenic emissions are periodically mixed with urban outflow transported by daytime southwesterly winds from Sacramento metropolitan area. During this...
Abstract. The CARES campaign was conducted during June, 2010 in the vicinity of Sacramento, California to study aerosol formation and aging a region where anthropogenic biogenic emissions regularly mix. Here, we describe measurements from an Aerodyne High Resolution Aerosol Mass Spectrometer (AMS), Ionicon Proton Transfer Reaction (PTR-MS), trace gas detectors (CO, NO, NOx) deployed on G-1 research aircraft investigate ambient gas- particle-phase chemical composition. AMS showed that...
Abstract. Mounting evidence from field and laboratory observations coupled with atmospheric model analyses shows that primary combustion emissions of organic compounds dynamically partition between the vapor particulate phases, especially as near-source dilute cool to ambient conditions. The most recent version Community Multiscale Air Quality 5.2 (CMAQv5.2) accounts for semivolatile partitioning gas-phase aging these aerosol (POA) consistent experimentally derived parameterizations. We also...
Abstract. Chemically resolved atmospheric aerosol data sets from the largest intercomparison of Aerodyne chemical speciation monitors (ACSMs) performed to date were collected at French supersite SIRTA. In total 13 quadrupole ACSMs (Q-ACSM) European ACTRIS ACSM network, one time-of-flight (ToF-ACSM), and high-resolution ToF mass spectrometer (AMS) operated in parallel for about 3 weeks November December~2013. Part 1 this study reports on accuracy precision instruments all measured species....
The aim of this study was to evaluate adverse effects multiwalled carbon nanotubes (MWCNT), produced for industrial purposes, on the human epithelial cell line A549. MWCNT were dispersed in dipalmitoyl lecithin (DPL), a component pulmonary surfactant, and dispersion DPL compared those two other media: ethanol (EtOH) phosphate-buffered saline (PBS). Effects also asbestos fibers (chrysotile crocidolite) black (CB) nanoparticles, not only A549 cells but mesothelial (MeT5A line), used as an...
Abstract. As part of the European ACTRIS project, first large Quadrupole Aerosol Chemical Speciation Monitor (Q-ACSM) intercomparison study was conducted in region Paris for 3 weeks during late-fall – early-winter period (November–December 2013). The week dedicated to tuning and calibration each instrument, whereas second third were side-by-side comparison ambient conditions with co-located instruments providing independent information on submicron aerosol optical, physical, chemical...
Abstract. During the Carbonaceous Aerosols and Radiative Effects Study (CARES), activation fraction of size-resolved aerosol particles chemical composition were characterized at T1 site (~60 km downwind Sacramento, California) from 10 June to 28 2010. The hygroscopicity cloud condensation nuclei (CCN)-active (κCCN) with diameter 100 170 nm, derived activated fraction, varied 0.10 0.21, an average 0.15, which was substantially lower than that proposed for continental sites. low κCCN value due...
Abstract. Substantial uncertainties still exist in the scientific understanding of possible interactions between urban and natural (biogenic) emissions production transformation atmospheric aerosol resulting impact on climate change. The US Department Energy (DOE) Atmospheric Radiation Measurement (ARM) program's Carbonaceous Aerosol Radiative Effects Study (CARES) carried out June 2010 Central Valley, California, was a comprehensive effort designed to improve this understanding. primary...
carbon nanotubes (CNT) can have adverse effects on health. Therefore, minimizing the risk associated with CNT exposure is of crucial importance. The aim this work was to evaluate if coating multi-walled (MWCNT) polymers could modify their toxicity, thus representing a useful strategy decrease health CNT. We used industrially-produced MWCNT uncoated (NT1) or coated (50/50 wt%) acid-based (NT2) polystyrene-based (NT3) polymer, and exposed murine macrophages (RAW 264.7 cell line) Balb/c mice by...
Abstract. The performance of the Weather Research and Forecasting regional model with chemistry (WRF-Chem) in simulating spatial temporal variations aerosol mass, composition, size over California is quantified using extensive meteorological, trace gas, measurements collected during Nexus Air Quality Climate Experiment (CalNex) Carbonaceous Aerosol Radiative Effects Study (CARES) conducted May June 2010. overall objective field campaigns was to obtain data needed better understand processes...
Aviation is a substantial and fast growing emissions source. Besides greenhouse gases, aircraft engines emit black carbon (BC), climate forcer air pollutant. BC have been regulated estimated through exhaust smoke visibility (smoke number). Their impacts are poorly understood because emission inventories lack representative data. Here, we measured mass number-based of the most popular airliner's according to new standard. We used calibrated engine performance model determine on ground, at...
Abstract. Regional new particle formation and growth events (NPEs) were observed on most days over the Sacramento western Sierra foothills area of California in June 2010 during Carbonaceous Aerosols Radiative Effect Study (CARES). Simultaneous measurements at both T0 (Sacramento, urban site) T1 (Cool, rural site located ~40 km northeast Sacramento) sites CARES indicate that NPEs usually occurred morning with appearance an ultrafine mode ~15 nm (in mobility diameter, Dm, measured by a size...
PM2.5 pollution has become a global health concern, however its size-resolved impact remains to be poorly elucidated. Here, ambient particulate matter (PM) were collected into 13 different size ranges (10 nm 18 μm) and the mass, metal, endotoxin distributions, related oxidative potential investigated in two regions (Zürich, Switzerland Beijing, China). Results showed that had remarkably PM distribution patterns. Swiss urban samples mode around 40 with 23.3% of total while Chinese featured...
There are fundamental differences between electronic cigarettes (e-cigarettes) and conventional cigarette product categories with regards to potential environmental exposures, notably that e-cigarettes do not contain tobacco or generate side-stream emissions. Here we assess the spatial temporal patterns of exhaled e-cigarette aerosol at a bystander's position, compare it smoke emissions.Smokers were asked use in room-simulating chamber. Volunteers used products different distances from...
Exposure to particles (PM) induces adverse health effects (cancer, cardiovascular and pulmonary diseases). A key-role in these seems be played by oxidative stress, which is an excess of reactive oxygen species relative the amount reducing (including antioxidants), first line defense against species. The aim this study was document stress caused exposure respirable vivo, test whether exposed workers presented changes their urinary levels for species.Bus depot (n = 32) pollutants (respirable...
Abstract. Measurements of the effect water uptake on particulate light extinction or scattering made at two locations during 2010 Carbonaceous Aerosols and Radiative Effects Study (CARES) study around Sacramento, CA are reported. The observed influence uptake, characterized through dimensionless optical hygroscopicity parameter γ, is compared with calculations constrained by particle size distributions size-dependent composition. A closure assessment has been carried out that allowed for...
Six gases [N(CH3)3, NH2OH, CF3COOH, HCl, NO2 and O3] were selected to probe the surface of seven different types combustion aerosol samples (amorphous carbon, flame soot) three TiO2nanoparticles using heterogeneous, i.e. gas–surface reactions. The gas uptake saturation probes was measured under molecular flow conditions in a Knudsen reactor expressed as density functional groups on particular aerosol, namely acidic (carboxylic) basic (conjugated oxides such pyrone, N-heterocycle amine)...