Research Advances of Prevention and Control of Hydrogen Sulfide in Coal Mines

Table 1

The environmental standards of H₂S of difference control.

Characteristic boundary		Gas concentration	Source
Smell	Stimulus threshold	0.012 mg/m^3 ~ 0.03 mg/m^3; (0.007 5 mg/m^3 ~ 0.019 mg/m^3)	Hygiene (Fifth Edition)
	Moderate odor	3 ppm ~ 4.60 ppm
Health standard	Workshop	10 mg/m^3 (6.5 ppm)	≪TJ36-79 Industrial Enterprise Design Hygiene Standards≫
	Residential area	0.01 mg/m^3 (0.0065 ppm)
	Maximum allowable concentration in the workplace (MAC)	10 mg/m^3 (6.5 ppm)	≪GBZ2-2002 Occupational Exposure Limits for Harmful Factors in the Workplace≫
	Coal mine	6.6 ppm	≪Coal Mine Safety Regulations≫
	America	10 ppm (15min)	US Health Authority (1975)
	Japan	10 ppm (15min)	Japan Industrial Hygiene Society (1975)