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ground-level concentration of air pollution [环境] 地面空气污染浓度
The results show that (1) with the time change, the traffic has obviously change. (2) the concentration of air pollution and traffic have a close relation.
结果表明：(1)车流量随时间变化明显。路口的车流量以出租车占的比例最大。(2)污染物浓度与车流量有较为密切的关系。
Objective to study distribution of air pollution source, determine the historical exposure concentration of air pollution in the region, and assure the work scope of health investigation.
目的根据区域大气污染源分布研究确定区域大气污染物历史暴露浓度，确定健康调查工作范围。
Authorities measure the concentration of particulates with a diameter of less than 10 microns - so-called PM10 - in the air to determine pollution levels.
检测机构会检测直径小于10微米的微粒，即PM 10浓度，并由此判定污染程度。
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