Publications by authors named "G Grivas"
Article Synopsis
- The study addresses the lack of high-resolution, long-term PM (particulate matter) data in Greece and the Eastern Mediterranean by developing a national spatial modeling approach that integrates various data sources for more accurate health exposure estimates.* -
- A 1 km gridded dataset of PM concentrations from 2015 to 2022 was created, with Random Forest models showing the best predictive performance, particularly revealing winter months had the highest PM levels due to residential biomass burning.* -
- The findings indicate that the Greek population is consistently exposed to PM concentrations above WHO guidelines, particularly in Central and Northern regions, highlighting an urgent need for targeted measures to improve air quality.*
There is a body of evidence that ultrafine particles (UFP, those with diameters ≤ 100 nm) might have significant impacts on health. Accordingly, identifying sources of UFP is essential to develop abatement policies. This study focuses on urban Europe, and aims at identifying sources and quantifying their contributions to particle number size distribution (PNSD) using receptor modelling (Positive Matrix Factorization, PMF), and evaluating long-term trends of these source contributions using the non-parametric Theil-Sen's method.
View Article and Find Full Text PDFWildfires occurring near urban areas are known to have exceedingly detrimental impacts on the environment, air quality, economy and human health. In this framework, this study examines the effects of peri-urban forest fires on atmospheric chemical composition, and aerosol physical-optical properties in Athens, Greece, during August 2021. Satellite imagery and air mass trajectories showed advection of intense smoke plumes over Athens from three forest fires persisting for 10 days in the greater Athens area and in Central Greece (Euboea).
View Article and Find Full Text PDFArticle Synopsis
- This study highlights the health risks associated with oxygenated polycyclic aromatic hydrocarbons (OPAHs) and their need for monitoring alongside traditional PAHs to evaluate urban health impacts.
- An extensive sampling campaign in Athens, Greece, revealed seasonal variations in polycyclic aromatic compounds (PACs), primarily influenced by residential wood burning, especially during winter.
- The impact of external factors like biomass burning and the COVID-19 lockdown on PAC levels was significant, emphasizing the importance of regulating biomass burning to improve urban air quality.
To study the spatiotemporal variability of particle-bound polycyclic aromatic hydrocarbons (PAHs) and assess their carcinogenic potential in six contrasting urban environments in Greece, a total of 305 filter samples were collected and analyzed. Sampling sites included a variety of urban background, traffic (Athens, Ioannina and Heraklion), rural (Xanthi) and near-port locations (Piraeus and Volos). When considering the sum of 16 U.
View Article and Find Full Text PDF