The main pollution sources are coal combustion, traffic emission, the residue of oil or mineral combustion and burning emission which accounts for 44.0%, 31.0% 19.9% and 4.7% of SVOCs, respectively.
整个南京地区的大气颗粒物中半挥发性有机物的主要污染源为燃煤源、交通排放源、燃油及矿物燃料残留物排放源、焚烧源，其贡献率分别为：44.0％、31.0％、19.9％、4.7％。
Commuters can choose to take buses, subways or share cars with others, which not only relieves traffic jams but also reduces gas emission.
通勤族可以选择乘坐公共汽车、地铁或是与他人合用车辆，这不仅可以减轻交通堵塞，也可以减少尾气排放。
Commuters can choose to take buses, subways or share cars with others, which not only relieves traffic jams but also reduces gas emission.
通勤族能够选取乘坐公共汽车、地铁或是与他人合用车辆，这不仅仅能够减轻交通堵塞，也能够减少尾气排放。
Control of urban traffic pollution the motor vehicle emission should be controlled.
控制城市交通污染，必须严格控制机动车的排放。
Highly application of GIS to urban traffic pollution management has been developed, which consisted of proscenium-GIS system, back stage-motor vehicle emission model and spatial data base.
开发了高层应用城市交通污染管理信息系统，由前台gIS系统、后台机动车排放模型、空间数据库三大部分构成。
The result shows that the system can confirm the effect of vehicle emission on air pollution composition and evaluate the effect of traffic management and control strategies on vehicle emission.
结果表明：该系统不但可估算并预测车辆在某一路段的污染物排放水平，还可评价交通管理改进措施对车辆排放的影响。
Because we had good choices of test conditions and test vehicle, we conclude that the emission concentration distributions can describe emission of in-use light-duty vehicle in our cities traffic.
基于对测试条件和测试车辆的选择，可以说得到的排放分布情况能够初步反映出轻型在用车在我国大城市交通环境中的排放情况。
Its main pollution sources were industrial dust, smoke dust, exhaust emission and construction and traffic dust.
其主要污染源为工业粉尘、烟尘，机动车排放的尾气，建筑施工及道路交通产生的尘污染。
Urban traffic is a dynamic system, whose pollutant emission always changes.
城市交通是一个动态系统，污染物排放量始终处于变化之中。
Gradually reducing the use of petroleum products in the traffic and transportation sector is very important to reducing overall energy consumption and the emission of carbon dioxide.
逐步减少交通运输领域石油能源产品的使用量，对减少能源消费总量和二氧化碳排放量十分重要。
Gradually reducing the use of petroleum products in the traffic and transportation sector is very important to reducing overall energy consumption and the emission of carbon dioxide.
逐步减少交通运输领域石油能源产品的使用量，对减少能源消费总量和二氧化碳排放量十分重要。
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