PAN Pesticides Database - Chemicals

Methyl bromide - Identification, toxicity, use, water pollution potential, ecological toxicity and regulatory information

Note: See Working with the Information on this Page section below for important notes about this data.

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Identifying information, including synonyms, ID numbers, use type, chemical classification, a link to a list of all products containing this chemical and a list of the top crops this pesticide is used on in California.
Signs and symptoms of poisoning, first aid, and links to treatment information for this chemical.
Link to information on toxicity to humans, including carcinogenicity, reproductive and developmental toxicity, neurotoxicity, and acute toxicity.
Links to world-wide registration status as well as regulatory information for the U.S. and California.
Water quality standards and physical properties affecting water contamination potential.
Toxicity to aquatic organisms.
List of chemicals in the same family, including breakdown products, salts, esters, isomers, and other derivatives.

Chemical Identification and Use for Methyl bromide

Basic Identification Information About This Chemical
Chemical Name: Methyl bromide
CAS Number: 74-83-9
U.S. EPA PC Code: 053201
CA DPR Chem Code: 385
Molecular Weight: 94.94
Use Type: Fumigant , Herbicide , Insecticide , Nematicide
Chem Class: Halogenated organic
View Related Chemicals
Additional Resources About This Chemical Class and Use Type
Historical Use of this Chemical
Top five crops and sites for this pesticide in California
Strawberries   Soil Preplant   Outdoor Propagation Nursery   Outdoor Container Nursery   Other Fumigation  
View All Crops and Sites
Other Names for this Chemical
About Chemical Synonyms
(US EPA PC Code ) , (US EPA PC Code ) , 053201 (US EPA PC Code Text ) , 385 (CA DPR Chem Code) ) , 74-83-9 (CAS number) , 74839 , 74839 (CAS number without hyphens) , 853201 (US EPA PC Code Text ) , Brometo De Metila , Brometo De MetilaŹ , Brometo de metilo , BrometoDeMetila , BrometoDeMetilaŹ , Bromomethane , Bromomethane (Methyl bromide) , bromure de methyle , Methyl bromide , Methyl bromide (NO INERT USE) , METHYL BROMIDE (CA DPR Chem Code Text ) , Methyl bromide as a structural fumigant , Methyl Bromide-1 , Methyl Bromide-2 , Methyl Bromide-3-1 , Methyl Bromide-3-2 , Methyl Bromide-4-1 , Methyl Bromide-4-2 , Methyl Bromide-4-3 , Methyl Bromide-4-4 , Methyl Bromide-4-5 , Methyl Bromide-4-6 , Methylbromid , Methylbromide , Metilbromid
Products Containing This Chemical
Current and historic U.S. registered products
View U.S. Products All Products Currently Registered Products

Signs and Symptoms of Methyl bromide Poisoning

NOTE! There may be other diseases and chemicals that have similar symptoms.

If you have a poisoning emergency in the United States call 1-800-222-1222.
If the victim has collapsed or is unconscious, call 911.

Symptoms of Methyl bromide Exposure from the International Chemical Safety Cards (ICSC)

Report a Poisoning

View full ICSC Cards: English   Español   Française   Chinese   Dutch   Finnish   German   Hungarian   Japanese   Swahili   Thai   Urdu  

Route of Exposure


First Aid

Inhalation Abdominal pain. Convulsions. Dizziness. Headache. Laboured breathing. Vomiting. Weakness. Hallucinations. Loss of speech. Incoordination. Fresh air rest. Half-upright position. Artificial respiration if indicated. Refer for medical attention.
Skin Tingling. Itching. MAY BE ABSORBED! Redness. Burning sensation. Pain. Blisters. (Further see Inhalation). ON CONTACT WITH LIQUID: FROSTBITE. ON FROSTBITE: rinse with plenty of water do NOT remove clothes. Rinse skin with plenty of water or shower. Refer for medical attention.
Eyes Redness. Pain. Blurred vision. Temporary loss of vision. First rinse with plenty of water for several minutes (remove contact lenses if easily possible) then take to a doctor.
Notes for ICSC Information
Depending on the degree of exposure periodic medical examination is indicated. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential. Immediate administration of an appropriate spray by a doctor or a person authorized by him/her should be considered. The odour warning when the exposure limit value is exceeded is insufficient. Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. Bromo-O-gas Dowfume Embafume Halon 1001 Haltox Meth-o-gas Terabol and Terr-o-Gas 100 are trade names.
Symptoms of Methyl bromide Exposure from Other Sources

- Severe irritation of lower respiratory tract.
- Central nervous system depression and convulsions.
- Pulmonary edema, hemorrhage, and confluent pneumonia.
- Early symptoms of acute poisoning include headache, dizziness, nausea, vomiting, tremor, slurred speech, and ataxia,
- Severe poisoning exhibits myoclonic and generalized tonic clonic seizures, ataxia, muscle weakness, tremors, behavioral disturbances and diminished reflexes.
- Skin contact causes severe burning, itching, blister formation and necrosis.

Source for Symptoms: Recognition and Management of Pesticide Poisoning, 5th edition, U.S. EPA, Chapter 16. March 1999. (EPA R&M)

First Aid for Methyl bromide Poisoning

No first aid available for this particular chemical. Get medical aid.

Source for First Aid: (ICSC)

Treatment for Methyl bromide Poisoning

See: Recognition and Management of Pesticide Poisoning, 5th edition, U.S. EPA, Chapter 16. (EPA R&M)


Toxicity Information for Methyl bromide

  Note: Information for many chemicals is incomplete and may not be fully representative of effects on humans. Why?

Summary Toxicity Information

PAN Bad Actor
Carcinogen Cholinesterase
Water Contaminant
Developmental or
Reproductive Toxin
Unclassifiable No
Indicates high toxicity in the given toxicological category. Indicates no available weight-of-the-evidence summary assessment. For additional information on toxicity from scientific journals or registration documents, see the "Additional Resources for Toxicity " section of the chemical detail page.
1. PAN Bad Actors are chemicals that are one or more of the following: highly acutely toxic, cholinesterase inhibitor, known/probable carcinogen, known groundwater pollutant or known reproductive or developmental toxicant. NOTE! Because there are no authoritative lists of Endocrine Disrupting (ED) chemicals, EDs are not yet considered PAN Bad Actor chemicals.
2. The acute toxicity reported on this page is of the pure chemical ingredient only and may not reflect the acute toxicity of individual pesticide products. To view acute toxicity of individual products, click on 'View Products' link in the 'Chemical Identification' section above.

Detailed Toxicity Information

Acute Toxicity 2
Methyl bromide
WHO Acute Hazard
TRI Acute Hazard
Material Safety Data Sheets
Acute rating from U.S. EPA product label
U.S. NTP Acute Toxicity Studies
      View Studies
Cholinesterase Inhibitor
Fumigant, not classified, b
Not Listed
Highly Toxic
Highly Toxic
Not Acutely Toxic to Moderately Toxic

2. The acute toxicity reported on this page is of the pure chemical ingredient only and may not reflect the acute toxicity of individual pesticide products. To view acute toxicity of individual products, click on 'View Products' link in the 'Chemical Identification' section above.
Cancer Information
Methyl bromide
IARC Carcinogens
U.S. NTP Carcinogens
California Prop 65 Known Carcinogens
U.S. EPA Carcinogens
TRI Carcinogen
3, Unclassifiable
Not Listed
Not Listed
Not Likely
Not Listed
Endocrine Disruption
Methyl bromide
Illinois EPA list
Keith list
Colborn list
Benbrook list
Danish Inert list
EU list
Not listed
Not listed
Not listed
Not listed
Not listed
Reproductive and Developmental Toxicity
Methyl bromide
CA Prop 65 Developmental Toxin
U.S. TRI Developmental Toxin
CA Prop 65 Female Reproductive Toxin
CA Prop 65 Male Reproductive Toxin
U.S. TRI Reproductive Toxin
Not Listed
Not Listed
Not Listed
Not Listed
Chemicals of Special Concern
Methyl bromide
PAN Bad Actors
PAN Dirty Dozen list
Not Listed

Water Pollution Potential and Criteria for Methyl bromide

Water Pollution Potential

PAN Ground Water Contaminant Rating Insufficient Data
Physical Property Data Related to Water Contamination Potential
Water Solubility (Avg, mg/L)
Adsorption Coefficient (Koc)
Hydrolysis Half-life (Avg, Days)
Aerobic Soil Half-life (Avg, Days)
Anaerobic Soil Half-life (Avg, Days)

Water Standards and Criteria

U.S. National Drinking Water Standards and Health Criteria
µg/L unless noted  
Maximum Contaminant Level (MCL) 0  
Maximum Contaminant Level Goal (MCLG)  
One Day Exposure Health Advisory Level 100.0  
Ten Day Exposure Health Advisory Level 100.0  
Lifetime Exposure Health Advisory Level 10.0  
Reference Dose 1.00 (µg/kg/day)  
U.S. Drinking Water Equivalent Level 50.0  
Concentration with Lifetime Cancer Risk of 1 in 10,000  
U.S. National Water Quality Criteria
µg/L unless noted  
Fresh Water Quality Criteria Continuous Exposure  
Fresh Water Quality Criteria Maximum Peak  
Salt Water Quality Criteria Continuous Exposure
Salt Water Quality Criteria Max
Human Consumption of Organisms from Water Source 1,500 Notes: b
Human Consumption of Water and Organisms from Water Source 47.0 Notes: b
Taste and Odor Criteria

Regulatory Information for Methyl bromide

International Regulatory Status

UNEP Persistent Organic Pollutant (POP)
UNEP Prior Informed Consent Chemical (PIC)
WHO Obsolete Pesticide
Not Listed
Not Listed
Not Listed

U.S. and California Regulatory Status

U.S. EPA Registered
U.S. EPA Hazardous Air Pollutant
U.S. EPA Minimum Risk Pesticide (25b list)

CA Registered
CA Groundwater Contaminant
CA Toxic Air Contaminant

Not Listed

Maximum Tolerance and Residue Levels

Codex Alimentarius
   (UN FAO Maximum Residue Limits)
U.S. Maximum Tolerance Levels
European Union Maximum Residue Levels
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Ecotoxicity for Methyl bromide

Note! Information for many chemicals is incomplete and may not be fully representative of effects on the environment. Why? Click on underlined terms for definitions and additional information.

Aquatic Ecotoxicity

All Toxic Effects for Organism Group
Organism Group Effects Noted
Fish Behavior, Growth, Histology, Intoxication, Mortality
Phytoplankton Growth
Zooplankton Behavior, Intoxication, Mortality, Reproduction
View All Aquatic Ecotoxicity Studies and References
Summary of Acute Toxicity for Organism Group
Organism Group Average Acute Toxicity Acute Toxicity Range
Fish Moderately Toxic Slight to Moderate Toxicity
Zooplankton Moderately Toxic Moderate Toxicity
View All Acute Summaries

Terrestrial Ecotoxicity

Summary of Acute Toxicity for Organism Group

Sorry, no honeybee acute toxicity data available for this chemical. Try related chemicals.

Note: Population-level effects on honeybees may occur even if a pesticide has low acute toxicity. For example, certain pesticides interfere with honeybee reproduction, ability to navigate, or temperature regulation, any of which can have an effect on long-term survival of honeybee colonies. The neonicotinoids, pyrethroids and keto-enol pesticides are some types of pesticides causing one or more of these effects.
Honeybee Chronic Toxicity

Sorry, no honeybee chronic toxicity data available for this chemical. Try related chemicals.

Related Chemicals for Methyl bromide

CAS Number Relation Reason Chemical Name Chem Detail Symptoms California Use Chem Use Type U.S. EPA Reg PAN Bad Actor
74-83-9 Parent P Methyl bromide View View View Fumigant, Insecticide, Herbicide, Nematicide Yes Yes
8004-09-9 Related 13 Methyl bromide w/chloropicrin View View View Fumigant, Fungicide, Nematicide No Not Listed
Working with the Information on this Page

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* Data marked with an asterisk indicates that this chemical is not explicitly listed on the corresponding list. Instead, it belongs to a group of chemicals that IS designated on the list. For example, if an agency assigns a classification of reproductive toxicant to "mercury compounds", that classification is applied to all mercury compounds in the PAN Pesticide database, which are then marked with an asterisk.

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