[Emission characteristics of paved roads fugitive dust in Beijing].

Based on sampling and laboratory analyzing silt loading of 82 city roads and 56 suburb paved roads in Beijing, we using AP-42 emission factor model studied emission characteristics of paved road fugitive dust, and analyzed two methods to determine silt loading of different roads. The results show that silt loading of expressway, major arterial, minor arterial and collectors in city areas is 0.17, 0.34, 1.48, 2.60 g/m2 respectively, and silt loading of national road, province road, county road, village road and municipal road in the suburbs areas is 0.18, 0.56, 1.58, 3.10, 1.58 g/m2 respectively. In the city areas, using the relationship of silt loading and traffic volume,and in the suburbs areas, using the average value of different type roads to determine the silt loading are better. Silt loading and emission factor are negatively correlated with traffic volume, but the emission strength is increased with the increase of traffic volume. Emission strength of different type roads was also studied. In the city areas, emission strength of major arterial is strongest and the value is 130.2 kg/(km x d), and in the suburbs areas, emission strength of national road is strongest and the value is 43.8 kg/(km x d).