ExposureLimit

H2SLevel (ppm) Descriptions

8-hours 10ppmTime-

weighted Average (TWA)

15Minutes

15ppmTWA for up to 15 minutes with 1 hour in between exposures

Ceiling 20ppmNever exceed without respiratory protection.MASK UP!!!!!!!

CAUTION!!!!The accepted industry standard is to wear breathing apparatus any time a risk of exposure exists.

Good work practices should aim for ZERO exposure to H2S!!!!!

H2S Exposure Possible Health effectsLess than 1ppm You can smell it

10ppm No known adverse health effects for most people Respiratory protection is required beyond this level

20-200ppm Eye and respiratory tract irritation & loss of smell Headache and nausea

200-500ppm Above effects but sooner and more severe Loss of breathing and death within hours

500-700ppm Affects the central nervous system Loss of reasoning, loss of balance, unconsciousness and breathing to stop within minutes

700-1000ppm Immediate loss of consciousness Permanent brain damage and death if not rescued immediately