A5067619535- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Vehicle emissions and performance
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- Toxic Organic Pollutants Impact
- Atmospheric aerosols and clouds
- Indoor Air Quality and Microbial Exposure
- Climate change and permafrost
- Cryospheric studies and observations
- Maritime Transport Emissions and Efficiency
- Odor and Emission Control Technologies
- Advanced Chemical Sensor Technologies
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Fire dynamics and safety research
- Catalytic Processes in Materials Science
- Ocean Acidification Effects and Responses
- Environmental Policies and Emissions
- Cyclone Separators and Fluid Dynamics
- Hydrocarbon exploration and reservoir analysis
- Industrial Gas Emission Control
- Thermochemical Biomass Conversion Processes
- Smart Materials for Construction
- Oil Spill Detection and Mitigation
Aix-Marseille Université
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Laboratoire de Chimie Bactérienne
2012-2024
Paul Scherrer Institute
2013-2024
Collège de France
2022
Centre de Recherche et d’Enseignement de Géosciences de l’Environnement
2022
Institut de Recherche pour le Développement
2022
Université de Sherbrooke
2014-2021
Institut des Géosciences de l'Environnement
2017
UCLouvain
2017
Abstract. The effect of a post-industrial megacity on local and regional air quality was assessed via month-long field measurement campaign in the Paris metropolitan area during winter 2010. Here we present source apportionment results from three aerosol mass spectrometers two aethalometers deployed at stations within region. Submicron composition is dominated by organic fraction (30–36%) nitrate (28–29%), with lower contributions sulfate (14–16%), ammonium (12–14%) black carbon (7–13%)....
Abstract. The emission of organic aerosols (OA) in the ambient air by residential wood burning is nowadays a subject great scientific concern and growing number studies aim at apportioning influence such emissions on urban quality. In present study, results obtained using two commonly-used source apportionment models, i.e., Chemical Mass Balance (CMB, performed with off-line filter measurements) Positive Matrix Factorization (PMF, applied to Aerosol Spectrometer measurements), as well...
Abstract. We present a new mobile environmental reaction chamber for the simulation of atmospheric aging different emission sources without limitation from instruments or facilities available at any single site. Photochemistry is simulated using set 40 UV lights (total power 4 KW). Characterisation spectrum these shows that emissions may be over range temperatures (−7 to 25 °C). A photolysis rate NO2, JNO2, (8.0 ± 0.7) × 10−3 s−1 was determined °C. demonstrate utility this system by...
Major summertime aerosol emission sources in Paris were assessed using a high resolution time‐of‐flight mass spectrometer (HR‐ToF‐AMS). The application of positive matrix factorization (PMF) to the highly and time‐resolved AMS measurements allowed identification primary secondary organic (OA) sulfate aerosols. Primary anthropogenic emissions contributed on average ~27% (14.7% cooking, 12% traffic) total mass, while major contribution fraction was associated with formation products....
Abstract Carbonaceous particulate matter (PM), comprising black carbon (BC), primary organic aerosol (POA) and secondary (SOA, from atmospheric aging of precursors), is a highly toxic vehicle exhaust component. Therefore, understanding pollution requires knowledge both emissions, how these emissions age in the atmosphere. We provide systematic examination carbonaceous PM parameterisation SOA formation modern diesel gasoline cars at different temperatures (22, −7 °C) during controlled...
Organic aerosol (OA) is a key component of total submicron particulate matter (PM1), and comprehensive knowledge OA sources across Europe crucial to mitigate PM1 levels. has well-established air quality research infrastructure from which yearlong datasets using 21 chemical speciation monitors (ACSMs) 1 mass spectrometer (AMS) were gathered during 2013-2019. It includes 9 non-urban 13 urban sites. This study developed state-of-the-art source apportionment protocol analyse long-term spectrum...
This study analyzed the variability of equivalent black carbon (eBC) mass concentrations and their sources in urban Europe to provide insights into use eBC as an advanced air quality (AQ) parameter for AQ standards. compiled concentration datasets covering period between 2006 2022 from 50 measurement stations, including 23 background (UB), 18 traffic (TR), 7 suburban (SUB), 2 regional (RB) sites. The results highlighted need harmonization measurements allow direct comparisons measured across...
The 2017–2019 hourly particle number size distributions (PNSD) from 26 sites in Europe and 1 the US were evaluated focusing on 16 urban background (UB) 6 traffic (TR) framework of Research Infrastructures services reinforcing air quality monitoring capacities European URBAN & industrial areaS (RI-URBANS) project. main objective was to describe phenomenology ultrafine particles (UFP) with a significant focus. varying lower detection limits made it difficult compare PN concentrations (PNC),...
A reliable determination of equivalent black carbon (eBC) mass concentrations derived from filter absorption photometers (FAPs) measurements depends on the appropriate quantification cross-section (MAC) for converting coefficient (babs) to eBC. This study investigates spatial–temporal variability MAC obtained simultaneous elemental (EC) and babs performed at 22 sites. We compared different methodologies retrieving eBC integrating options calculating including: locally derived, median value...
Abstract. Aerosol hygroscopicity and refractory black carbon (rBC) properties were characterised during wintertime at a suburban site in Paris, one of the biggest European cities. Hygroscopic growth factor (GF) frequency distributions, by distinct modes more-hygroscopic background aerosol non- or slightly hygroscopic local (or regional) origin, revealed an increase relative contribution sources compared to with decreasing particle size. BC-containing particles Paris mainly originating from...
Cooking processes produce gaseous and particle emissions that are potentially deleterious to human health. Using a highly controlled experimental setup involving proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS), we investigate the emission factors detailed chemical composition of gas phase from broad variety cooking styles techniques. A total 95 experiments were conducted characterize nonmethane organic (NMOG) boiling, charbroiling, shallow frying, deep frying various...
Abstract. In order to identify and quantify key species associated with non-exhaust emissions exhaust vehicular emissions, a large comprehensive dataset of particulate has been obtained thanks simultaneous near-road urban background measurements coupled detailed traffic counts chassis dynamometer few in-use vehicles well-represented in the French fleet. Elemental carbon, brake-wear metals (Cu, Fe, Sb, Sn, Mn), n-alkanes (C19-C26), light-molecular-weight polycyclic aromatic hydrocarbons...
Abstract. A detailed characterization of air quality in the megacity Paris (France) during two 1-month intensive campaigns and from additional 1-year observations revealed that about 70 % urban background fine particulate matter (PM) is transported on average into upwind regions. This dominant influence regional sources was confirmed by situ measurements short longer-term campaigns, aerosol optical depth (AOD) ENVISAT, modeling results PMCAMx CHIMERE chemistry transport models. While...
Abstract. Secondary organic aerosol (SOA), a prominent fraction of particulate mass (OA), remains poorly constrained. Its formation involves several unknown precursors, and evolution pathways multiple natural anthropogenic sources. Here combined gas-particle phase source apportionment is applied to wintertime summertime data collected in the megacity Paris order investigate SOA origin during both seasons. This was possible by combining information provided an spectrometer (AMS) proton...
<strong class="journal-contentHeaderColor">Abstract.</strong> A thermal desorption aerosol gas chromatograph coupled to a high resolution – time of flight mass spectrometer (TAG-AMS) was connected an atmospheric chamber for the molecular characterization evolution organic (OA) emitted by woodstove appliances residential heating. Two log woodstoves (old and modern) one pellet stove were operated under typical conditions. Emissions aged during equivalent 5 h aging. The five seven samples...
Abstract. Hydroxyl radicals play a central role in the troposphere as they control lifetime of many trace gases. Measurement OH reactivity (OH loss rate) is important to better constrain budget and also evaluate completeness measured VOC budget. Total atmospheric was for first time an European Megacity: Paris its surrounding areas with 12 million inhabitants, during MEGAPOLI winter campaign 2010. The method deployed Comparative Reactivity Method (CRM). dataset contains both calculated from...
Abstract. We investigated the seasonal trends of OA sources affecting air quality Marseille (France), which is largest harbor Mediterranean Sea. This was achieved by measurements nebulized filter extracts using an aerosol mass spectrometer (offline-AMS). In total 216 PM2. 5 (particulate matter with aerodynamic diameter < 2.5 µm) samples were collected over 1 year from August 2011 to July 2012. These filters used create 54 composite analyzed offline-AMS. The same also for major...
Abstract. A growing number of studies are using specific primary sugar species, such as alcohols or saccharides, marker compounds to characterize and apportion biogenic organic aerosols (PBOAs) in the atmosphere. To better understand their annual cycles, well spatiotemporal abundance terms concentrations sources, we conducted a large study focusing on three major atmospheric (i.e., arabitol, mannitol, glucose) measured various environmental conditions for about 5300 filter samples collected...
Abstract. Organic gases emitted during the flaming phase of residential wood combustion are characterized individually and by functionality using proton transfer reaction time-of-flight mass spectrometry. The evolution organic is monitored photochemical aging. Primary gaseous emissions dominated oxygenated species (e.g., acetic acid, acetaldehyde, phenol methanol), many which have deleterious health effects play an important role in atmospheric processes such as secondary aerosol formation...
Abstract. Source apportionment of organic aerosols (OAs) is great importance to better understand the health impact and climate effects particulate matter air pollution. Air quality models are used as potential tools identify OA components sources at high spatial temporal resolution; however, they generally underestimate concentrations, comparisons their outputs with an extended set measurements still rare due lack long-term experimental data. In this study, we addressed such challenges...
The CARA program has been running since 2008 by the French reference laboratory for air quality monitoring (LCSQA) and regional networks, to gain better knowledge—at a national level—on particulate matter (PM) chemistry its diverse origins in urban environments. It results strong collaborations with international-level academic partners state-of-the-art, straightforward, robust methodologies within operational stakeholders (and subsequently, decision makers). Here, we illustrate some of main...
Changes in mass, extent, duration, and physical properties of snow are key elements for studying associated climate change feedbacks northern regions. In this study, we analyzed snowpack along a 'mega' transect from 47°N to 83°N (4,000 km) northeastern Canada, which includes marked transitions between ecozones boreal forest subarctic arctic ecosystems. Our unique dataset 391 detailed snowpits acquired over the last 20 years, complemented with data weather stations, shows that such as water...