Skip directly to local search Skip directly to A to Z list Skip directly to navigation Skip directly to site content Skip directly to page options
CDC Home

Enter search terms separated by spaces.

Carbon monoxide

Synonyms & Trade Names
Carbon oxide, Flue gas, Monoxide
CAS No.
630-08-0
RTECS No.
FG3500000
DOT ID & Guide
1016 119
9202 168 (cryogenic liquid)
Formula
CO
Conversion
1 ppm = 1.15 mg/m3
IDLH
1200 ppm
See: 630080
Exposure Limits
NIOSH REL
: TWA 35 ppm (40 mg/m3) C 200 ppm (229 mg/m3)
OSHA PEL
†: TWA 50 ppm (55 mg/m3)
Measurement Methods

NIOSH 6604;
OSHA ID209 , ID210
See: NMAM or OSHA Methods
Physical Description
Colorless, odorless gas. [Note: Shipped as a nonliquefied or liquefied compressed gas.]
MW:
28.0
BP:
-313°F		 MLT: -337°F
Sol:
2%
VP:
>35 atm
IP:
14.01 eV
Fl.P:
NA (Gas)
UEL:
74%
LEL:
12.5%
RGasD:
0.97
Flammable Gas
Incompatibilities & Reactivities
Strong oxidizers, bromine trifluoride, chlorine trifluoride, lithium
Exposure Routes
inhalation, skin and/or eye contact (liquid)
Symptoms
headache, tachypnea, nausea, lassitude (weakness, exhaustion), dizziness, confusion, hallucinations; cyanosis; depressed S-T segment of electrocardiogram, angina, syncope
Target Organs
cardiovascular system, lungs, blood, central nervous system
Personal Protection/Sanitation
(See protection codes)
Skin: Frostbite
Eyes: Frostbite
Wash skin: No recommendation
Remove: When wet (flammable)
Change: No recommendation
Provide: Frostbite wash
First Aid
(See procedures)
Eye: Frostbite
Skin: Frostbite
Breathing: Respiratory support
Respirator Recommendations

NIOSH

Up to 350 ppm:
(APF = 10) Any supplied-air respirator

Up to 875 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode

Up to 1200 ppm:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern†
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece

Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus

Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern†
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also: INTRODUCTION   See ICSC CARD: 0023   See MEDICAL TESTS: 0040
 

Order NIOSH Publications

Contact Us:
USA.gov: The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Rd. Atlanta, GA 30333, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348, New Hours of Operation 8am-8pm ET/Monday-Friday
Closed Holidays - cdcinfo@cdc.gov