Where It Comes From
Older fire suppression systems/handheld extinguishers, legacy solvent uses, and recycling or disposal of halon equipment [1][2].
How You Are Exposed
Breathing vapors after a discharge or leak, during equipment servicing, or in poorly ventilated spaces; less often by skin contact [1].
Why It Matters
Short-term exposure can cause dizziness, headache, confusion, and unconsciousness; it can irritate eyes and lungs. Very high levels can be life‑threatening. Repeated exposure may harm the liver and kidneys [1].
Who Is at Risk
Technicians servicing or decommissioning halon systems, emergency responders, workers using legacy solvents, and people in enclosed areas during/after a discharge [1][2].
How to Lower Your Exposure
Replace halon systems with EPA‑accepted alternatives; have certified professionals remove and recycle old units; evacuate and ventilate after any discharge; use leak detection and appropriate PPE per NIOSH guidance; read labels/SDS before use [1][2].
References
- [1]CDC/NIOSH. NIOSH Pocket Guide to Chemical Hazards: Bromochloromethane (Halon 1011).
- [2]U.S. EPA. Ozone Layer Protection: Class I Ozone‑Depleting Substances (Halon 1011) and SNAP alternatives.