NITROGEN DIOXIDE†

Chemical Identification
CAS # 10102-44-0
Formula
 

NO₂

Synonyms
 

diesel exhaust component, dinitrogen tetroxide (N₂O₄), NO₂, nitrogen peroxide, nitrogen tetroxide

Physical Properties
Physical description Yellowish-brown liquid or reddish-brown gas (above 70°F) with a pungent, acrid odor.
Boiling point 70°F Molecular weight 46
Freezing point/melting point 15°F Vapor pressure 720 mmHg
Flash point Vapor density 2.62
Specific gravity 1.44 (liquid at 68°F) Ionization potential 9.75 eV
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating 3 NFPA fire rating 0
NFPA reactivity rating 0 NFPA special instruction OX: Possesses oxidizing properties
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 1903
Sampling group
Sampler/Sampling media 2-section tube packed with a 400 mg TEA-IMS front and a 200 mg back-up section [SKC 226-40-02]
Sampling time*
 

15 min

Sampling volume (TWA)*
 

 

Sampling flow rate (TWA)*
 

 

Sampling volume (STEL/Peak/C)*

3 L

 

 

Sampling flow rate (STEL/Peak/C)*
 

0.2 L/min

Analytical method instruments IC
Method reference OSHA ID-182 (fully validated)
Notes
 

Submit as a separate sample.

Special requirements
 

 

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Sampler/Sampling media
 

 

Bulk Method
Bulk Method
 

 

On-Site Screening Techniques
Device CMS Chip
Model/Type Nitrogen dioxide, 0.5-25 ppm range
Sampling information
(see manufacturer instructions)
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA
 

 

REL-TWA
 

 

TLV-TWA
 

0.2 ppm [2011]

PEL-TWA
 

 

PEL-STEL
 

 

REL-STEL
 

1 ppm (1.8 mg/m³)

TLV-STEL
 

 

PEL-STEL
 

1 ppm (1.8 mg/m³)

PEL-C
 

5 ppm (9 mg/m³)

REL-C
 

 

TLV-C
 

 

PEL-C
 

 

Skin notation
 

N

Skin notation
 

N

Skin notation
 

N

Skin notation
 

N

Notes:
 

See 29 CFR 1910.1000 Table Z-1.

Notes:
 

 

Notes:
 

 

Notes:
 

 

Health factors:  See NIH-NLM PubChem. IDLH
 

20 ppm

Carcinogenic classifications: TLV-A4 Notes:
 

 

AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 

1 ppm/15 ppm/30 ppm

Last Updated Date : 01/05/2021