A compressed air environment is an environment in which air has been mechanically compressed, resulting in a rise in air pressure higher than atmospheric pressure.
Some examples of compressed air environments are, but are not limited to, shafts (an excavation); tunnels (a subterranean passage); caissons (a casing being sunk or constructed below ground or water level); and similar types of construction projects in which a worker is, or is likely to be, subjected to working in compressed air.
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Check out our safe work procedure template on working in compressed air. (Below the FAQs are more resources related to compressed air.)