On spatial, there are high pollutants concentrations in active economic areas with high density of population.

空间上，经济活跃、人口密集点污染物浓度高。

youdao

On spatial, there are high pollutants concentrations in active economic areas with high density of population.

空间上，经济活跃、人口密集点污染物浓度高。

youdao