In what situation is it necessary to use a respirator according to safety practices?

Using a respirator is critical when handling any pesticides or dangerous materials due to the potential for harmful exposure to toxic chemicals, particulates, vapors, or aerosols that can occur during pest control operations. Pesticides can have various formulations and active ingredients that may pose health risks if inhaled. Respirators are designed to filter out these harmful substances and protect the respiratory system from inhalation hazards, thereby safeguarding the health of the exterminator and preventing potential negative health impacts.

In addition to pesticide handling, the use of respirators is a standard safety practice in various environments where hazardous materials are present, thus indicating the need for such protection regardless of the specific conditions. While enclosed spaces often increase the concentration of airborne contaminants, the requirement for respiratory protection extends beyond just those scenarios. Similarly, potential exposure to infectious agents is important, but that situation doesn't usually necessitate respirators in the same way that pesticide handling does. Lastly, while dealing with liquid pesticides can certainly require respiratory protection, it is not limited to that context; solid or gaseous forms of pesticides can also create inhalation risks.