A5014953669- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Climate Change and Health Impacts
- Geophysics and Gravity Measurements
- Industrial Gas Emission Control
- Chemical Synthesis and Characterization
- Atmospheric Ozone and Climate
- Indoor Air Quality and Microbial Exposure
- Carbon Dioxide Capture Technologies
- Catalytic Processes in Materials Science
- Vehicle emissions and performance
- Oxidative Organic Chemistry Reactions
- Hydrogen's biological and therapeutic effects
- Respiratory Support and Mechanisms
- Inorganic and Organometallic Chemistry
- Free Radicals and Antioxidants
- Sulfur Compounds in Biology
- Lanthanide and Transition Metal Complexes
- Chemical Synthesis and Reactions
- Radioactive element chemistry and processing
- Advanced Chemical Sensor Technologies
- Human Health and Disease
- Cyclone Separators and Fluid Dynamics
Foundation for Research and Technology Hellas
2025
FORTH Institute of Chemical Engineering Sciences
2024
University of Patras
2024
Max Planck Institute for Chemistry
2021-2023
Harvard University
2018-2022
Abstract PM 2.5 during severe winter haze in Beijing, China, has reached levels as high 880 μg/m 3 , with sulfur compounds contributing significantly to composition. This been traditionally assumed be sulfate, although atmospheric chemistry models are unable account for such large sulfate enhancements under dim conditions. Using a 1‐D model, we show that well‐characterized but previously overlooked of aqueous‐phase HCHO and S(IV) cloud droplets form S(IV)‐HCHO adduct, hydroxymethane...
Air pollution is a major risk factor for human health. Chemical reactions in the epithelial lining fluid (ELF) of respiratory tract result formation reactive oxygen species (ROS), which can lead to oxidative stress and adverse health effects. We use kinetic modeling quantify effects fine particulate matter (PM2.5), ozone (O3), nitrogen dioxide (NO2) on ROS formation, interconversion, reactivity, discuss different chemical metrics stress, such as cumulative production hydrogen peroxide (H2O2)...
Abstract Sulfur compounds are an important constituent of particulate matter, with impacts on climate and public health. While most sulfur observed in matter has been assumed to be sulfate, laboratory experiments reveal that hydroxymethanesulfonate (HMS), adduct formed by aqueous phase chemical reaction dissolved HCHO SO 2 , may easily misinterpreted measurements as sulfate. Here we present observational modeling evidence for a ubiquitous global presence HMS. We find filter samples collected...
Significance Particulate matter, often formed via cloud processing, strongly influences the Earth’s climate and air quality. Particle composition depends on anthropogenic biogenic emissions. Thus, in order to understand change, knowledge of difference between preindustrial current conditions is critical. Under conditions, multifunctional organic hydroperoxides, which are strong oxidants have ability contribute particulate matter formation, higher concentrations atmosphere. In this work, we...
The oxidation of sulfur dioxide (SO2) by peroxides leads to the formation sulfate in cloudwater, contributing particulate matter (PM) formation. reaction with hydrogen peroxide (H2O2) is considered be main cloud pathway. Previous studies have examined SO2 cloudwater small organic one functional group; however, multifunctional hydroperoxides, which are expected higher water solubility and reactivity, has not been examined. We investigate aqueous two isomers isoprene hydroxyl hydroperoxide...
Abstract. Oxidation of sulfur dioxide (SO2) in the gas phase and cloud fog water leads to formation sulfate that contributes ambient particulate matter (PM). For severe haze events with low-light conditions, current models underestimate levels occur exclusively via oxidation dioxide. We show here measurement techniques commonly used field analyze PM composition can fail efficiently separate sulfur-containing species, resulting possible misidentification compounds. Hydroxymethanesulfonate...
Abstract. The Cloud-AerosoL InteractionS in the Helmos background TropOsphere (CALISHTO) campaign took place autumn 2021 at NCSR Demokritos high-altitude Hellenic Atmospheric Aerosol and Climate Change station (HAC)2 to study interactions between aerosols clouds. current presents chemical characterization of non-refractory (NR) PM1 aerosol fraction using a time-of-flight speciation monitor (ToF-ACSM). A comparative offline filter analysis by high-resolution mass spectrometer (HR-ToF-AMS)...
Monitoring indoor air quality in schools is essential, particularly as children are highly vulnerable to pollution. This study evaluates the performance of low-cost sensor-based monitoring system ENSENSIA, during a 3-week campaign an elementary school classroom Athens, Greece. The measured PM2.5, CO, NO, NO2, O3, and CO2. High-end instrumentation provided reference concentrations. aim was assess sensors’ estimating average day-to-day exposure, capturing temporal variations degree agreement...
A multiphase kinetic model analysis quantifies effects of air pollutants on reactive oxygen species production and oxidative stress in the respiratory tract.
Abstract. In-cloud chemistry has important ramifications for atmospheric particulate matter formation and gas-phase chemistry. Recent work shown that, like hydrogen peroxide (H2O2), the two main isomers of isoprene hydroxyl hydroperoxide (ISOPOOH) oxidize sulfur dioxide dissolved in cloud droplets (SO2,aq) to sulfate. The revealed that pathway SO2,aq oxidation with ISOPOOH differs from H2O2. We investigate chemical mechanisms cloud-relevant pH range 3–6 compare them previously reported H2O2,...
The levels of gas and particulate pollutants were measured inside outside a primary school classroom located in suburban area the city Patras, Greece, during wintertime to evaluate indoor air quality, identify potential problems, determine effectiveness ventilation. Foundation for Research Technology–Hellas (FORTH) mobile laboratory was deployed, switching valve system used obtain both outdoor measurements. main source in‐classroom pollutants, as windows remained partially open. Ventilation...
Abstract. The Cloud-AerosoL InteractionS in the Helmos background TropOsphere (CALISHTO) campaign took place autumn 2021 at NCSR Demokritos high-altitude Hellenic Atmospheric Aerosol & Climate Change station (HAC)2 to study interactions between aerosols and clouds. current presents chemical characterization of Non-Refractory (NR) PM1 aerosol fraction using a Time-of-Flight Chemical Speciation Monitor (ToF-ACSM). A comparative offline filter analysis by High-Resolution Mass...
Abstract. Oxidation of sulfur dioxide (SO2) in the gas phase and cloud fog water leads to formation sulfate that contributes ambient particulate matter (PM). For severe haze events with dim conditions, current models underestimate levels which occurs exclusively via oxidation dioxide. We show here measurement techniques commonly used field analyse PM composition can fail efficiently separate sulfur-containing species resulting possible misidentification compounds. Hydroxymethanesulfonate...
<p>Formaldehyde (HCHO) is produced mainly via photochemical oxidation of volatile organic compounds as well direct emissions from combustion processes. HCHO has a high vapor pressure but result the hydration aldehyde group, it Henry’s law constant that allows to partition into cloud droplets. We present results two different pathways through which may contribute mass particulate matter: Formation hydroxymethanesulfonate (HMS) reaction with dissolved sulfur dioxide...