Evaluation of the emissions and uncertainties of PM_(2.5)originated from vehicular traffic and domestic wood combustion in Finland

摘要

Primary fine particulate matter(PM_(2.5))emissions from low-altitude sources,such as traffic and domestic combustion,may cause immediate exposure near the source.In this paper we present emission estimate and uncertainty analysis of PM_(2.5)emissions from the vehicular traffic and domestic wood combustion sectors.Our estimate of national PM_(2.5)emissions in 2000 from domestic wood combustion was 7.6 Gg a~(-1)and that from vehicular traffic,including non-exhaust emissions,5.8 Gg a~(-1).These values correspond to 25% and 19% of the national total PM_(2.5)emissions,respectively.The uncertainties were high for non-exhaust traffic and domestic wood combustion emissions,37% down,53% up and 36% down,50% up of the mean value(95% confidence interval limits),respectively.For traffic exhaust emissions,the uncertainties were lower,11% down,13% up.Uncertainties in the domestic combustion emission factors were the most important individual parameters accounting for total uncertainty.