Carbon monoxide is a colourless, odourless gas that kills without warning. On construction sites, CO is produced by petrol and diesel engines, generators, compressors, and any combustion equipment used in enclosed or poorly ventilated spaces. Workers have died from CO poisoning in basements, partially enclosed buildings, and near running plant. This talk explains the sources, symptoms, and prevention measures for CO exposure.
Key Hazards
Death or permanent brain damage from carbon monoxide inhalation in enclosed spaces
CO accumulation from petrol generators or compressors running inside buildings
Diesel exhaust emissions building up in deep excavations or tunnels
Symptoms mistaken for fatigue or flu allowing exposure to continue undetected
Control Measures
Never operate petrol or diesel-powered engines, generators, or compressors inside enclosed spaces.
Ensure adequate ventilation when any combustion equipment is used near partially enclosed areas.
Fit personal CO alarm monitors to every worker entering areas where CO accumulation is possible.
Evacuate immediately if a CO alarm activates and move upwind into fresh air.
Position exhaust outlets of generators and compressors to discharge away from building openings.
Use battery-powered or mains electric tools instead of petrol-powered equipment in enclosed spaces.
Recognise the early symptoms of CO exposure: headache, dizziness, nausea, and confusion.
Ensure CO detectors are calibrated, tested, and within their service date before each shift.
Brief all operatives on CO sources, symptoms, and the emergency evacuation procedure.
Emergency / Rescue
If CO poisoning is suspected, move the casualty to fresh air immediately. Call 999 and inform them of suspected CO exposure. Begin CPR if the person is unresponsive and not breathing. Do not re-enter the affected area.
Remember
Never operate petrol or diesel engines, generators, or compressors inside enclosed spaces
Fit personal CO alarm monitors to every worker in areas where CO accumulation is possible
Evacuate immediately if a CO alarm activates and move upwind into fresh open air
Recognise the early symptoms of CO poisoning: headache, dizziness, nausea, and confusion
Use battery or mains electric tools instead of petrol equipment in enclosed or confined areas
Applicable Legislation: COSHH Regulations 2002 · EH40 Workplace Exposure Limits · Health and Safety at Work etc. Act 1974 · Management of Health and Safety at Work Regulations 1999