Treatment of asphyxia from poisonous gases:
1. Move the victim in to the fresh air.
2. Open the airway.
3. Check whether the victim is breathing.
If the victim is breathing, give hime 100% oxygen.
If he is not breathing, start artificial ventilation,
preferably with a bag-valve-mask and 100% oxygen.
4. Check for a pulse.
If there is no pulse, start chest compressions in
coordination with ventilations.
If there is no pulse and breath, you must start "CPR".
5. Transfer the victim to hospital urgently.