General information, not an individual diagnosis. Ask a healthcare professional if you are unsure about your situation.
Near an engine, headache, severe fatigue, nausea, vomiting, dizziness or loss of consciousness can suggest carbon monoxide poisoning. Ventilate, stop the engine if possible, evacuate immediately and call 15, 18 or 112 in France (114 for people who are deaf or hard of hearing).
Exhaust gases contain carbon monoxide. Small petrol engines must never be used in poorly ventilated premises; no filtering respirator protects against this gas.
Combustion engines also release particles in a workshop. Emissions can affect several people in the same space.
Diesel exhaust is classified as carcinogenic to humans. Prevention must address all situations in which exposure occurs.
In its public prevention guidance, Santé publique France says never to leave a vehicle running in an enclosed space. Separately, INRS describes local exhaust extraction near stationary vehicles in repair workshops and technical inspection centres. Ask the supervisor to clarify the prevention measures and conditions appropriate to the planned work.
General ventilation complements extraction. With the supervisor, clarify tasks with engines running, instructions, maintenance and checks.
Sources
- INRS — Gaz d’échappement. Prévenir les risques liés aux gaz d’échappement - Risques chimiques - INRS ; mise à jour 2022-11-24
- INRS — Prévenir les risques chimiques. Protection collective contre les risques chimiques - Risques chimiques - INRS ; mise à jour 2026-06-22
- Santé publique France — Intoxication au monoxyde de carbone, 26 novembre 2025
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