Hazards of confined spaces require clearly defined policies.
D002980:Climate; D004781:Environmental Exposure; D005739:Gas Poisoning / Q000517:prevention & control; D006801:Humans; D000860:Hypoxia / Q000517:prevention & control; D008697:Methane / Q000506:poisoning; D008834:Microclimate; D009784:Occupational Diseases / Q000517:prevention & control*; D011640:Public Policy
D008697:Methane