Directed at fire prevention in goaf, the paper proposes a method of injecting nitrogen and controlling nitrogen air to flow direction using fugitive air and controlling air quantity in gob.
为解决采空区防火问题，提出从采空区漏入风一侧顺流注氮，充分利用采空区漏风流向控制氮气的流向并控制漏风量的注氮思路。
The second fugitive dust about vehicle is an important source of air pollution in northern city of China, the measure and calculation methods need to be developed and researched.
机动车行驶过程二次扬尘已成为中国北方城市扬尘污染的重要来源，有关机动车二次扬尘量化计算亟待研究开发。
Urban fugitive dust is one of the urban pollution sources of influencing air quality, degrading atmospheric visibility and endangering citizens' health.
城市地面扬尘是影响城市空气质量、降低大气能见度、危害市民身体健康的城市污染源之一。
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