CO Gas Symptoms

CO Gas Symptoms

How can we reduce the risk of poisoning:

  • For gas appliances, use an engineer registered through Gas Safe Register for installation and annual services. Always check that an engineer’s capabilities, which are listed on the back of his or her identity card, include the job you want doing. If you live in rented property, ask your landlord to show you the property’s gas safety certificate
  • Consult your fuel supplier or professional heating engineer for the regular servicing of other fuel-burning appliances
  • Rooms should be well ventilated and chimneys or flues swept regularly
  • Fit an audible CO alarm, but remember this should be in addition to the other actions
  • Know the signs of CO poisoning, which include: in your family (particularly children and the elderly, and maybe even your pets) – prolonged flu-like symptoms; gas appliances burning with orange, instead of blue, flames; sooty stains on or near appliances; excessive condensation in the room; and coal or wood fires that burn slowly or go out.


Concentration Symptoms
35ppm Headache and dizziness within six to eight hours of constant exposure
100ppm Slight headache within two to three hours
200ppm Slight headache within two to three hours; loss of judgment
400ppm Frontal headache within one to two hours
800ppm Dizziness, nausea and convulsions within 45 mins; insensible within two hours
1,600ppm Headache, dizziness and nausea within 20 mins; death in less than two hours
3,200ppm Headache, dizziness and nausea in 5 to 10 mins. Death within 30 minutes
6,400ppm Headache and dizziness in one to two minutes. Convulsions, respiratory arrest, and death in less than 20 minutes
12,800ppm Unconsciousness after 2-3 breaths. Death in less than three minutes

*ppm = parts per million. This is a measure of the concentration of carbon monoxide in the air.

Reduce the risk of being poisoned by the deadly gas carbon monoxide, with these simple tips.

Many people are likely to suffer unknowingly from CO poisoning, and the impact on health may well be underestimated. Those most at risk are the under 14s and the over 65s, with these age groups accounting for 31% and 25% of hospital admissions respectively. Many more people are likely to suffer unknowingly from CO poisoning, and the impact on health may well be underestimated.

Carbon monoxide can be given off by all fossil fuels. You need to look out for:

  • Boiler pilot light flames burning orange, instead of blue
  • Sooty stains on or near appliances
  • Excessive condensation in the room
  • Coal or wood fires that burn slowly or go out
  • Families suffering prolonged flu-like symptoms.


Take a few simple precautions to reduce your risk:

Have your gas appliances serviced annually by a gas engineer who is registered with Gas Safe Register

  • Use professionals to service any other fossil-fuel burning appliances such as oil or coal burning stoves annually
  • Fix carbon monoxide detectors in your home; these can be purchased from most DIY-type stores
  • Ensure that such detectors are maintained and replaced according to packaging instructions.

On April 1, 2009, the Gas Safe Register replaced CORGI as the scheme under which anyone carrying out domestic and commercial gas work must be registered in Great Britain and the Isle of Man. Click here to find out more [Press Office] or visit: A film about the change in arrangements can be viewed on YouTube here


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Panthergas Direct Ltd
Unit D4 Seedbed Business Centre
Vanguard Way
Essex. SS3 9QY

Telephone: 01702 384038
Facsimile: 01702 382340

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