Construction Health and Safety Technician (CHST) 2025 – 400 Free Practice Questions to Pass the Exam

The requirement for a full face mask when working in an atmosphere containing chlorine is based on the need for comprehensive respiratory protection. Chlorine is a highly toxic and corrosive gas, which can cause serious respiratory issues and eye damage upon exposure. The use of a full face mask provides a higher level of protection compared to a half face mask, as it not only covers the nose and mouth, reducing inhalation risk, but also protects the eyes and face from irritant exposure, which is crucial when dealing with chlorine.

Full face masks are often equipped with cartridges or filters that are specifically designed to remove or neutralize chlorine gas, ensuring the wearer remains safe in environments where this substance is present. Additionally, a full face mask can help to maintain a seal around the entire face, minimizing the risk of gas ingress that can occur with a half mask or other less-protective options.

Surgical masks, designed primarily to protect against biological contaminants and not for chemical hazards, would not provide adequate protection against chlorine. Similarly, the option indicating no mask required fails to recognize the hazardous nature of chlorine and the regulatory requirements set forth by OSHA for protective equipment in such settings.