粒度乘数表示道路扬尘排放因子模型中不同粒径的颗粒物的系数,是道路扬尘排放清单的重要参数,直接影响排放清单的不确定性.2015年春季用样方真空吸尘法采集了天津市市区11条道路88个点位的道路扬尘样品,在便携式气溶胶粒径谱仪 Grimm1.109和再悬浮采样器粒径实验基础上,通过公式计算得到了道路扬尘 PM 2.5的粒度乘数值 K 2.5,开展了粒度乘数分布特征的研究.结果表明：天津市春季非机动车道和机动车道慢车道道路扬尘的 PM 2.5粒度乘数范围分别为0.053~0.088g/VKT 和0.047~0.087g/VKT；主干道、次干道、支路以及快速路的非机动车道 PM 2.5的粒度乘数 K 2.5均大于机动车道慢车道的 K 2.5,环线的机动车道 PM 2.5的粒度乘数 K 2.5均大于非机动车道慢车道的K 2.5；不同道路类型的道路扬尘 PM 2.5粒度乘数分布规律为：机动车道,环线>次干道>主干道>支路>快速路；非机动车道,次干道>支路>主干道>环线>快速路；道路两侧相同类型车道间 PM 2.5粒度乘数中位值不同,但是其差异无统计学意义.%The size multiplier,the coefficient of different size particles in the road dust emission factor model, is one of the important parameters of road dust emission inventory, which directly affects its uncertainty. This study collected 88samples on 11roads in Tianjin City with quadrat sampling method in spring of 2015. On the basis of portable Grimm1.109 aerosol particle spectrometer and resuspender experiment, PM2.5 size multipliers of the road dust (K2.5) were obtained by the formula. And then the K2.5 distribution features were analyzed. The results were as follows: the K2.5medians of non-motorized vehicle lanes ranged from 0.053g/VKT to 0.088g/VKT, and the K2.5 medians of motorized vehicle lanes were 0.047~0.087g/VKT; the K2.5 median values of non-motorized vehicle lanes in major arterial, minor arterial, branch road and express way were greater than those of the slow lanes, but the K2.5 value of the slow-vehicle lanes in outer ring was a little larger than that of the non-motorized vehicle lanes; the sequential orders of K2.5 distribution in different types of roads were outer ring > minor arterial > major arterial >branch road > express way in the case of motorized vehicle lanes, and minor arterial > branch road > major arterial > outer ring > express way in the case of non-motorized vehicle lanes; the K2.5 median values of the same type lanes in two roadsides were different, but there was no statistically significant differences in-between them.
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