What type of scenarios typically require the use of a self-contained breathing apparatus (SCBA)?

Self-contained breathing apparatus (SCBA) is critical in scenarios where respiratory hazards are present, and the air quality may be compromised. Fumigation operations involve the use of chemicals that can produce harmful gases, necessitating the use of SCBA to protect workers from inhaling toxic substances. This equipment provides a safe and breathable air supply, enabling workers to perform their tasks in environments where there is a high risk of exposure to lethal fumes or asphyxiating agents.

In contrast, general construction work, routine pesticide application, and landscaping tasks primarily involve lower-level exposures where other forms of personal protective equipment, such as masks or respirators designed for specific chemicals, may be adequate. These scenarios typically do not present the same immediate and severe respiratory risks that would require the use of SCBA.