Welding Fume Exposure and Ventilation
29 CFR 1926.353 · 29 CFR 1926.55 · This talk in Spanish
Why it matters
That plume rising off your weld is metal fume and gas, and your lungs are the filter if ventilation is not. OSHA says welding fume can cause metal fume fever and, over time, lung damage, and stainless steel welding makes hexavalent chromium, which can cause cancer. OSHA requires ventilation for welding in confined spaces, and in enclosed spaces when the metal has zinc, lead, cadmium, chromium, mercury, or beryllium. Today: get your head out of the plume and air moving through the work.
Hazards
- ⚠ Breathing the plume directly by working with your head over the weld
- ⚠ Welding galvanized steel: zinc fume, which OSHA lists for extra ventilation in enclosed spaces
- ⚠ Stainless welding producing hexavalent chromium
- ⚠ Enclosed and confined spaces concentrating fume fast
- ⚠ Coatings, paints, and residues burning off into toxic smoke
- ⚠ Fume drifting to helpers and nearby trades
Controls and safe practices
- ✓ Position yourself upwind or beside the plume, never over it.
- ✓ Use local exhaust: a fume extractor arm or gun, placed as close to the arc as you can get it.
- ✓ Mechanical or local exhaust ventilation for welding in confined spaces, and in enclosed spaces when the metal has zinc, lead, cadmium, chromium, mercury, or beryllium, per 29 CFR 1926.353. Add it anywhere fume builds up.
- ✓ Grind off galvanizing and coatings at the weld zone before burning, or use rated respiratory protection.
- ✓ Stainless and long indoor sessions: respirator per the site respiratory program.
- ✓ Keep helpers and other trades out of the plume path or ventilate to protect them.
- ✓ Eye, nose, or throat irritation, dizziness, or nausea while welding means leave the area, get fresh air, and get medical help. Report it; do not tough it out.
What OSHA says
Exact words from the official text, with a link to each paragraph.
“Local exhaust ventilation shall consist of freely movable hoods intended to be placed by the welder or burner as close as practicable to the work.”
“either general mechanical or local exhaust ventilation meeting the requirements of paragraph (a) of this section shall be provided whenever welding, cutting, or heating is performed in a confined space.”
“Welding, cutting, or heating in any enclosed spaces involving the metals specified in this subparagraph shall be performed with either general mechanical or local exhaust ventilation meeting the requirements of paragraph (a) of this section: (i) Zinc-bearing base or filler metals or metals coated with zinc-bearing materials”
“Other employees exposed to the same atmosphere as the welders or burners shall be protected in the same manner as the welder or burner.”
“Chromium is converted to its hexavalent state, Cr(VI), during the welding process. Cr(VI) fume is highly toxic and can damage the eyes, skin, nose, throat, and lungs and cause cancer.”
By the numbers
- OSHA's permissible exposure limit for hexavalent chromium, Cr(VI), is 5 micrograms per cubic meter of air as an 8-hour time-weighted average. (OSHA Fact Sheet FS-3647, Controlling Hazardous Fume and Gases during Welding)
Site check before the talk
Walk the site and tick each line. Each line comes from the text quoted above.
- ☐The fume hood or extractor is placed as close to the weld as you can get it. (29 CFR 1926.353(a)(3))
- ☐Mechanical or local exhaust ventilation is running for any welding, cutting, or heating in a confined space. (29 CFR 1926.353(b)(1))
- ☐Galvanized or zinc-coated metal welded in an enclosed space gets mechanical or local exhaust ventilation. (29 CFR 1926.353(c)(1))
- ☐Helpers and other trades breathing the same air get the same protection as the welder. (29 CFR 1926.353(c)(4))
- ☐Treat stainless steel welding fume as a hexavalent chromium hazard and control it. (OSHA Fact Sheet FS-3647)
Quotes checked word for word against the official OSHA text on October 5, 2026. This is a summary for a crew talk, not legal advice; the full official text governs. How we check
Crew discussion questions
- What metal and coatings are we welding this week?
- Where is the fume extractor, and does it actually reach our work?
- Which of our weld locations count as enclosed spaces?
- Who has felt fume fever symptoms and what were you welding?
Applicable OSHA standards
29 CFR 1926.353, 29 CFR 1926.55
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