If a gas leak results in a medical emergency (i.e. if someone has lost mobility or consciousness as a result of breathing a high concentration of carbon dioxide or nitrogen), take the following actions:
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call the medical and fire and rescue emergency services – dial 999
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if the victim is in the cellar, do not go down to attend the victim as you may also be affected
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if the victim is not in the cellar, keep the victim warm
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ask a trained first aider to apply artificial respiration if breathing has stopped
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follow the instructions of emergency services personnel
