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      The reason for the occurrence of the "hazardous atmosphere" in Confined Space are:

      1. The oxygen content below 19.5% or above 23.5%

      2. The build-up of toxic gas is greater than Permissible Exposure Limit (PEL)

      3. The build-up of flammable gas is over 10% of its Lower Explosive Limit

      4. Any other atmospheric condition that is Immediately Dangerous To Life or Health

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