Characterization of organic aerosol: Sources
and atmospheric processing

 

Fine atmospheric particulate matter is composed by solid and liquid particles suspended in the atmosphere, characterized by an aerodynamic diameter smaller than 2.5 μm (PM_2.5) and often below 1 μm (PM₁). Fine particles are ubiquitous pollutant at urban, rural, and remote locations. In urban environment, and during the coldest seasons, PM_2.5 concentration is often above the limit of 10 mg m^-3 set by the World Health Organization to reduce adverse health effects. Exposure to fine particles is associated with negative health impacts, including hospitalization, cardiovascular and respiratory disease, and reduction of life expectancy. In addition, fine particles are responsible for visibility reduction and modification of earth radiation budget by direct and indirect effects.

Organic aerosol is often one of the most abundant component of atmospheric aerosol; it accounts for 20 to 50% of PM_2.5 mass in urban and rural locations, and up to 70% of PM₁  mass. In the following years strategies to mitigate emissions of organic aerosol and its precursors will be necessary to control and lower aerosol concentrations. To achieve this, a better knowledge of organic aerosol sources and processing is mandatory.

Organic aerosol sources, optical, and microphysical properties were investigated during field observations and laboratory experiments, combining experimental measurements and modeling tools. Our studies focused specifically on organic aerosol produced by wood combustion, and on the atmospheric processing of wood burning aerosol.

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