美国各地的城市都在治理空气污染，做法是控制汽车废气排放、限制使用薪柴炉和监测工厂污染。
Cities across the U. S. are cracking down on air pollution by enforcing auto emissions control, limiting the use of wood burning stoves, and by monitoring factory pollution.
探讨了废气（固定污染源）监测中监测前准备、监测过程、 数据处理等全程序的质量控制。
The paper discusses quality control of the whole process when monitoring waste gas stable pollution source based on preparation, monitoring, datum treating.
文章探讨了废气(固定污染源)监测中监测前准备、监测过程、数据处理等全程序的质量控制。
In the paper, it is discussed the whole process of quality control in waste gas (stationary pollution source) monitoring, which includes the preparation, monitoring, and data processing, etc.
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