['Confined Spaces']

['Confined Space Hazards', 'Permit-Required Confined Spaces']

03/12/2025

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Why can’t a worker rely on sight and sense of smell to detect toxic atmospheres?

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Why can’t a worker rely on sight and sense of smell to detect toxic atmospheres?

RegSense Confined Spaces Safety & Health Confined Space Hazards Construction Safety General Industry Safety Permit-Required Confined Spaces Best Results FAQ English Focus Area USA

There are unseen and odorless contaminants (or oxygen-deficient atmospheres) that can kill or incapacitate workers. Of those contaminants that have odor, some can be detected by our senses only at low concentration. Hydrogen sulfide, for example, will deaden the sense of smell at high concentrations. Because of this, employees might assume that a confined space is safe when it is not. There is no substitute for testing the air in a confined space prior to entry. A worker can also be exposed to a contaminant through skin contact while working in a confined space.

['Confined Spaces']

['Confined Space Hazards', 'Permit-Required Confined Spaces']

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