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.

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.

Urban fugitive dust is one of the urban pollution sources of influencing air quality, degrading atmospheric visibility and endangering citizens' health.