The content of metal elements in particles are higher in residents-commercial -transportation mixed district than that in administrative-education district, and are higher in winter than in fall.
颗粒物中金属元素含量商业交通居民混合区大于行政文教区，冬季浓度大于秋季。
The content of metal elements in particles are higher in residents-commercial -transportation mixed district than that in administrative-education district, and are higher in winter than in fall.
颗粒物中金属元素含量商业交通居民混合区大于行政文教区，冬季浓度大于秋季。
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