H 2 S Must Be Controlled Hydrogen sulfide (H 2 S) is a deadly gas immediately dangerous to life and health at a concentration of 100 parts per million (ppm). OSHA limits exposure to 10 ppm for an eight-hour workday, but there is no universal guidelines for limiting H 2 S concentrations. To control, employers must understand the H 2 S dangers present in their facilities. Employers must then establish safe limits. Athlon Solutions has seen limi

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