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。
Based on the box model used in atmospheric Science, Calculation of indoor air pollution concentration had been developed and it's effect factors were discussed as well.
在借鉴大气总量控制箱模式的理论基础上，探讨了室内空气污染物浓度的新的计算方法，并通过此模式对影响因素作了分析和分情况解释。
If the brood indoor and ventilated bad, oxygen will gradually reduce the concentration of carbon dioxide, air pollution, increase become up.
如果育雏室内通风不良，氧气就会逐渐减少，二氧化碳浓度增大，使空气变得污浊起来。
Through analysis of concentration change with time and space of mian air pollutants, some causes of the change regularity are expounded, being useful for pollution forecasting and control.
通过分析大气中主要污染物浓度的时空变化，阐明形成此规律的原因，对大气污染物的预测和防治具有一定意义。
Results: The main channel of atmospheric pollution and the law governing the changes in concentration were summed up and a proposal for the control of air quality in the compartments was advanced.
结果：分析归纳了舱室大气污染的主要途径及浓度变化规律；提出了舱室大气质量控制建议。
Monitoring of particulate matter concentration is the basis for urban air quality evaluation and pollution control, and also very important for health effects assessment.
颗粒物浓度监测不仅是评价城市空气质量的基础，而且是进行城市污染控制与环境健康效应评估的重要依据。
The concentration of arsenicum in coal was very high, and the internal air arsenicum pollution was serious.
居民燃用的石煤砷含量极高，其居住室内砷污染严重。
It can be used not only to measure smoke concentration and particle collection efficiency, but also to monitor various air pollution sources. Hence its broad prospect of application.
它不仅可以用来测试各种烟尘的浓度、环保设备的收尘效率，而且可用于各种烟尘污染源的监控，故具有广阔的应用前景。
China has vowed to launch its strictest environmental protection system and reduce the concentration of PM2.5 particulate pollution in cities with poor air quality by 18 percent by 2020.
中国已承诺施行最严格的环境保护条例，并预计在2020年之前将严重污染城市的PM 2.5颗粒污染浓度降低十八个百分点。
Air pollution prediction is a direct problem, and deriving diffusion coefficients from the concentration of pollutants is an inverse problem.
空气污染预报属于正问题，而从污染物浓度来求解扩散系数则属于反问题。
Air pollution prediction is a direct problem, and deriving diffusion coefficients from the concentration of pollutants is an inverse problem.
空气污染预报属于正问题，而从污染物浓度来求解扩散系数则属于反问题。
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