For Furnace repair in Grand Rapids MI, call Northern Lights Mechanical Services.
MECHANICAL SERVICES • HEATING • COOLING
(616) 696-2866
2500 Wiersma Ave.
Cedar Springs, MI 49319
24 Hour Emergency Service Available

Allowable Exposure Levels to Carbon Monoxide

Allowable (Legal) Limits for Carbon Monoxide

Occupational Safety & Health Administration, USA (OSHA) (for industrial situations) -

Permissible Exposure Limit (PEL, by TWA) - 50 ppm, 8 hrs.
Old PEL Standard (by TWA) - 35 ppm, 8 hrs.
Threshold Limit Value (TLV, by TWA) - 25 ppm (29 mg/cu. m)
(recommended by American Conference of Governmental & Industrial Hygienists ACGIH)
Ceiling (max. value, 15 min.) - 200 ppm (229 mg/cu. m)

MI Occupational Safety & Health Administration (MIOSHA) -

PEL (Industry, by TWA) - 35 ppm, 8 hrs. (38.5 mg/cu. m)
PEL (Construction, by TWA) - 50 ppm, 8 hrs. (55 mg/cu. m)
Ceiling (max. value) - 200 ppm (229 mg/cu. m)

Environmental Protection Agency, USA (EPA) -

Domestic, outdoor air, all ages (TWA) - 9 ppm*, 8 hrs.
Domestic, outdoor air, all ages (TWA) - 35 ppm, 1 hr.

World Health Organization (WHO) -

Domestic, outdoor air, all ages (TWA) - 9 ppm*, 8 hrs.

American Society of Heating, Refrigeration & Air Conditioning Engineers (ASHRAE) -

Indoor air (leakage at a heat register) - 9 ppm

American Gas Association -

Indoor air (leakage at a heat register) - 15 pm


TWA - Computed by making measurements at intervals over 8 hours, then adding the sums of the concentrations and the intervals, and dividing by 8 hours (480 min.). * Based on several published studies of people with coronary ischemic disease showing ECG changes during moderate exercise when breathing concentrations of CO giving 3% COHb.
Northern Lights Heating and Cooling is stocked with all your Furnace repair needs in Cedar Springs, MI.
2500 Wiersma Ave.
Cedar Springs, MI 49319
(616) 696-2866
Rate your Furnace repair service in Cedar Springs MI with us on Google.Rate your Furnace repair service in Cedar Springs MI with us on Google.
Northern Lights Heating and Cooling is stocked with all your Furnace repair needs in Cedar Springs, MI.
2500 Wiersma Ave.
Cedar Springs, MI 49319
(616) 696-2866
Rate your Furnace repair service in Cedar Springs MI with us on Google.Rate your Furnace repair service in Cedar Springs MI with us on Google.