In summer 2009, the smoke emissions from several wildfires, representing different Portuguese forest biomes, were sampled. A portable high-volume sampler was used to collect sequentially, on quartz fibre filters, PM_(2.5-10) and PM_(2.5) particles. Tedlar bags were used for sampling the gaseous phase. Emission factors for CO were 231±117 g kg~(-1) biomass (dry basis) burned, while for CO2 ranged from about 1000 to 1700 g kg~(-1). The emission factors obtained for other pollutants were as follows (in g kg~(-1) biomass, dry basis): 6-350 for total hydrocarbons, 0.5-42 for PM_(2.5), 1-60 for PM_(10), and 0.2- 42 for OC (in PM10). The metal elements represented, on average, 1.23 and 0.91%, while the measured watersoluble ions accounted for 2.6 and 2.1% of the PM_(2.5) and PM_(2.5-10) mass, respectively. Carbonates accounted for 0.15 to 3.1% (average = 0.83%) of PM_(2.5-10). The dominant elements were B, Ti, Mn, Cu, Zn, Zr and Ba.
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