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Communication Dans Un Congrès Année : 2023

Source apportionment of PM2.5 oxidative potential in an East Mediterranean site

Résumé

The East Mediterranean is the third region with the highest ambient and household air pollution attributable death rate, with an average of 125 per 100,000 population in 2016. This number could tend to rise in the future with the increase of aerosol concentrations due to climate change . These high concentrations of PM result mainly from transported pollution mixed with anthropogenic emissions (road traffic, industrial, and residential emissions), and natural emissions (Saharan and African deserts) . Therefore, it is crucial to determine the pollution sources and the species that contribute the most to the toxicity in order to develop efficient air quality strategies. The objectives of this work are to study the relationship between oxidative potential (OP) results and the PM2.5 chemical components, and to conduct a source apportionment of PM2.5 OP by coupling PMF results and multiple linear regression models. PM2.5 samples were collected for almost a year in Zouk Mikael (ZK), an urban site under industrial influence in Lebanon. ZK is characterized by the biggest power plant in the country which runs on heavy fuel oil, a high density of population (4,200 inhabitants/km2) along with high road traffic and the use of diesel generators for electricity generation. These samples were characterized for their carbonaceous fraction, water-soluble ions, elements, and organic species. Several tracer compounds were gathered in the PMF model to assess the contribution of the sources to PM2.5. Additionally, the oxidative properties of PM components were studied using the OP with two acellular methods: the ascorbic acid (AA) and the dithiothreitol (DTT) assays. The mean volume normalized OP-AAv value was 0.64 ± 0.29 nmol.min¬-1.m-3 and the mean OP-DTTv was 0.49 ± 0.32 nmol.min-1.m-3. Spearman correlations revealed strong correlations between OP-AAv and the carbonaceous fraction as well as organic compounds while OP-DTTv seemed to be more correlated with elements emitted from different anthropogenic activities. The apportionment of OP showed that local anthropogenic sources such as biomass burning (26% of OP-AAv and 10% of OP-DTTv), vehicular emissions (20% and 19%), and heavy fuel oil combustion (23% and 33%) contribute the most to the OP-AAv and OP-DTTv, respectively . The contribution of biomass burning in winter to OP was at least 33 times higher compared to summer while the highest contribution between the sources was found for HFO combustion during summer.
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Dates et versions

hal-04388221 , version 1 (11-01-2024)

Identifiants

  • HAL Id : hal-04388221 , version 1

Citer

Marc Fadel, Dominique Courcot, Gilles Delmaire, Gilles Roussel, Konstantina Oikonomou, et al.. Source apportionment of PM2.5 oxidative potential in an East Mediterranean site. Third annual online scientific workshop – Climate and atmosphere research and innovation in the Eastern Mediterranean and Middle East, The Cyprus Institute, Nov 2023, Online, Cyprus. ⟨hal-04388221⟩
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