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The use of residential wood combustion represents an important renewable energy source, but it contributes in a considerable way to atmospheric particulate matter (PM) concentration in urban as well as in rural sites. Moreover, recent studies pointed out wood burning as an important source of PAH.In the present work, the influence of wood combustion on PM was studied, investigating its contribution to the carbonaceous PM fraction and to benzo (

A c c e p t e d M a n u s c r i p t 2 Car Fluff samples collected from a shredding plant in Italy were classified based on 20 particle size, and three different size fractions were obtained in this way. A comparison 21 between these size fractions and the original Light Fluff was made from two different 22 points of view: i) the properties of each size fraction as a fuel were evaluated; and ii) the 23 pollutants evolved when each size fraction was subjected to combustion were studied. 24The aim was to establish which size fraction would be the most suitable for the purposes 25 of energy recovery. The Light Fluff analyzed contained up to 50 wt.% fines (particle 26 size < 20 mm). However, its low calorific value and high emissions of polychlorinated 27 dioxins and furans (PCDD/Fs), generated during combustion, make the fines fraction 28 inappropriate for energy recovery, and therefore, landfilling would be the best option. 29The 50-100 mm fraction exhibited a high calorific value and low PCDD/F emissions 30were generated when the sample was combusted, making it the most suitable fraction 31 for use as refuse-derived fuel (RDF). Results obtained suggest that removing fines from 32 the original ASR sample would lead to a material product that is more suitable for use 33 as RDF. 34 35

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