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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.
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24 Hour Emergency Service
Call Us Today
(540) 720-9364
Fill Out Our Online Form
Trustworthy  ~  Honest  ~  Reliable
Trustworthy  ~  Honest  ~  Reliable
Contact Information
 
Address:  501 Monticello Dr.
Stafford VA 22556
Phone:  (540) 720-9364
Fax:  (919) 875-2115
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Payment Options
 
For AC in Fredericksburg VA, we accept most major credit cards.
 
We accept check for Air Conditioner repair service provided in Stafford VA.
We accept cash for Cooling repair service provided in Woodbridge VA.
 
We accept all major credit cards, cash, checks, and debit cards. We also have financing options. Contact us for details.
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Business Hours
 
24 Hour Emergency Service Available
7 Days a Week  |  365 Days a Year
Monday:  8:00am - 5:00pm
Tuesday:  8:00am - 5:00pm
Wednesday:  8:00am - 5:00pm
Thursday:  8:00am - 5:00pm
Friday:  8:00am - 5:00pm
Saturday:  Closed
Sunday:  Closed
Monday - Friday:  8:00am - 5:00pm
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Get a Quote   |   Maintenance   |   Guarantees
Employment   |   Reviews   |   Search Site