A5000411571- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Vehicle emissions and performance
- Atmospheric Ozone and Climate
- Peanut Plant Research Studies
- Advanced Chemical Sensor Technologies
- Atmospheric aerosols and clouds
- Impact of Light on Environment and Health
- Odor and Emission Control Technologies
- Maritime Transport Emissions and Efficiency
- Toxic Organic Pollutants Impact
- Phytochemicals and Antioxidant Activities
- Energy and Environment Impacts
- Coconut Research and Applications
- Mycotoxins in Agriculture and Food
- Atmospheric and Environmental Gas Dynamics
- Water Quality Monitoring and Analysis
- Carbon Dioxide Capture Technologies
- COVID-19 impact on air quality
- Healthcare and Environmental Waste Management
- Municipal Solid Waste Management
- Fermentation and Sensory Analysis
- History and advancements in chemistry
- Indoor Air Quality and Microbial Exposure
Saint Joseph University
2016-2025
Cyprus Institute
2019-2025
Laboratoire des Sciences du Climat et de l'Environnement
2024
Groupe de Spectrométrie Moléculaire et Atmosphérique
2024
Institut Pierre-Simon Laplace
2010-2016
Université Paris-Est Créteil
2008-2016
Laboratoire Techniques, Territoires et Sociétés
2008-2016
Centre National de la Recherche Scientifique
2008-2016
Laboratoire Interuniversitaire des Systèmes Atmosphériques
2008-2016
Université Paris Cité
2008-2016
The hydroxyl (OH) radical is the most important oxidant in atmosphere since it controls its self-oxidizing capacity. main sources of OH radicals are photolysis ozone and nitrous acid (HONO). Due to attenuation solar radiation indoor environment, possibility formation through photolytic pathways indoors has been ignored up now. In air, ozonolysis alkenes suggested as an alternative route formation. Models indirect measurements performed now according this hypothesis suggest concentrations on...
Abstract. Nitrous acid measurements were carried out during the MEGAPOLI summer and winter field campaigns at SIRTA observatory in Paris surroundings. Highly variable HONO levels observed campaigns, ranging from 10 ppt to 500 1.7 ppb winter. Significant mixing ratios have also been measured daytime hours, comprised between some tenth of 200 for campaign few 1 campaign. Ancillary measurements, such as NOx, O3, photolysis frequencies, meteorological parameters (pressure, temperature, relative...
Abstract. Chemical Ionisation Mass Spectrometer measurements of hydroxyl radical (OH) and the sum hydroperoxy organic peroxy (HO2+RO2) radicals were conducted during MEGAPOLI summer field campaign at SIRTA observatory near Paris, France, in July 2009. OH showed a typical diurnal variation with averaged daytime maxima values around 5×106 1.2×108 molecule cm−3, respectively. Simultaneously, large number ancillary measurements, such as NOx, O3, HONO, HCHO other VOCs also conducted. These data...
Abstract. Measurements of gaseous and particulate organic carbon were performed during the MEGAPOLI experiments, in July 2009 January–February 2010, at SIRTA observatory suburban Paris. comprise primary secondary volatile compounds (VOCs), both anthropogenic biogenic origins, including C12–C16 n-alkanes intermediate volatility (IVOCs), suspected to be efficient precursors aerosol (SOA). The time series are generally consistent with times regional scale, clearly affected by meteorology air...
Abstract Terpenoids (isoprene and monoterpenes) are highly reactive Volatile Organic Compounds (VOCs) known for decades their biogenic origin. Here, we discuss the nature magnitude of anthropogenic emissions. We compiled re‐analyzed 14 data sets in situ VOC observations collected over last decade contrasting urban areas from mid‐latitudes to subtropical regions. show systematic presence terpenoids ambient air with clear covariations compounds ( R 2 > 0.50) even during mid‐latitude...
Abstract. During June, July and August 2006 five aircraft took part in a campaign over West Africa to observe the aerosol content chemical composition of troposphere lower stratosphere as African Monsoon Multidisciplinary Analysis (AMMA) project. These are first such measurements this region during monsoon period. In addition providing an overview tropospheric composition, paper provides description measurement strategy (flights performed, instrumental payloads, wing-tip comparisons) points...
Abstract. Source apportionment of PM2.5 was performed using positive matrix factorization (PMF) based on detailed chemical composition data from 24 h filter samples collected over a 3-month period (August–November 2020) at an urban site in Montréal, Canadian city with population approximately 4×106 people. This source study, which examined the main contributing sources to larger suite organic molecular markers than other studies, is first its sort Canada. A focus this study quantifying...
This work optimized the β-cyclodextrin (β-CD)-assisted extraction process of polyphenols from vine shoots. The efficiency β-CD was compared to that ethanol in terms quantity and antioxidant capacity (AC) extracted polyphenols. Response surface methodology permitted optimization concentration, time, temperature. optimal polyphenol content (PC) [5.8 mg gallic acid equivalent (GAE)/g dry matter (DM)] AC [3146 micromolar trolox per milliliter (μMTE)] were initially obtained with Syrah cultivar...
Abstract. We applied the positive matrix factorization model to two large data sets collected during intensive measurement campaigns (summer 2011 and winter 2012) at a sub-urban site in Beirut, Lebanon, order identify NMHC (non-methane hydrocarbons) sources quantify their contribution ambient levels. Six factors were identified five summer. PMF-resolved source profiles consistent with established by near-field measurements. The major traffic-related emissions (combustion gasoline...
Greater Cairo, the largest megacity of Middle East North Africa (MENA) region, is currently suffering from major aerosol pollution, posing a significant threat to public health. However, main sources pollution remain insufficiently characterized due limited atmospheric observations. To bridge this knowledge gap, we conducted continuous 2-month field study during winter 2019-2020 at an urban background site, documenting for first time chemical and physical properties submicron (PM
This modeling study shows that in an urban environment, the SOA production through oxidation of terpenoids emitted from anthropogenic sources is competitive with induced by their biogenic sources.
Environmental context Non-methane hydrocarbons play an important role in the formation of photochemical oxidants such as ozone. We investigate factors controlling distribution non-methane urban area Middle East. The study highlights importance local emissions and atmospheric dynamics, limited effect photochemistry at measurement site. Abstract Measurements over 70 C2-C16 (NMHCs) were conducted suburban Beirut (1.3 million inhabitants) summer 2011 winter 2012 during Emission Chemistry Organic...
Abstract. In the framework of TRANSport Emissions and Mitigation in East Mediterranean (TRANSEMED/ChArMEx) program, volatile organic compound (VOC) measurements were performed for first time Istanbul (Turkey) at an urban site September 2014. One commercial gas chromatograph coupled to a flame ionization detector (GC–FID) one proton transfer mass spectrometer (PTR-MS) deployed. addition, sorbent tubes canisters implemented within megacity close major emission sources. More than 70 species...
Terpenoids have long been known to originate from natural sources. However, there is growing evidence for emissions anthropogenic activities in cities, particular the production, manufacturing, and use of household solvents. Here, as part DATAbASE (Do Anthropogenic mAtter AtmoSpheric chEmistry?) project, we investigate first time potential role industrial on terpenoid burden urban atmosphere. This study based continuous VOC observations an intensive field campaign conducted July 2014 at...