摘要: Sources for polycyclic aromatic hydrocarbons (PAH) and their emission factors are discussed. The major sources are divided into two categories, stationary sources (such as industrial sources, residental heating, power and heat gen... 展开 Sources for polycyclic aromatic hydrocarbons (PAH) and their emission factors are discussed. The major sources are divided into two categories, stationary sources (such as industrial sources, residental heating, power and heat generation, incineration and open fires) and mobile sources (such as cars, trucks and airplanes). The emission factor for each source of each category is established. Uncertainties in the emission factors are introduced by limited data from each source, different sampling methods, and different methods for PAH analysis. The emission factors have been combined with statistical data for consumption/productiion from various sources in the Nordic countries (except Iceland) and estimates of total emission of PAH per year have been made. The effects on the total emissions due to variations in consumption/ production or emission factors are demonstrated. Data from several countries over the past 20-30 years indicate a substantial decrease in PAH emissions. However, emissions of other copollutants have also changed. In view of the plausible formation of potent transformation products, no firm conclusion can be made about changes in potential health hazards of PAH and their derivatives. 13 tables, 2 drawings, 75 references. (ERA citation 10:049626) 收起