This is a major source of pollution to the air, especially in urban and densely populated areas. The process of creating the polluting gas is combustion engine fuel: CO, CO2, SO2, NOx, Pb, CH4 The rock dust entrained in the moving process. In terms of media, the levels of pollution are relatively small, but if traffic density and planning large terrain, roads are not good, it will cause serious pollution to the roadside.
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