When are cartridge respirators often used?

Cartridge respirators are designed to protect users from inhaling hazardous substances in the air, making them versatile for various situations. They utilize replaceable cartridges that contain filter material tailored to specific contaminants, allowing them to be effective for both short and long exposure periods depending on the concentration of the chemical.

When used for relatively short exposure periods to concentrated chemicals, cartridge respirators can provide immediate protection by filtering out harmful substances. This is particularly important in situations where quick access to a breathable atmosphere is required, such as during certain pest control applications.

Moreover, cartridge respirators can also be suitable for long exposure to low concentrations of toxic chemicals. They continue to filter and provide protection over extended periods, assuming the cartridges are appropriate for the specific chemicals and have not reached their expiration or saturation point.

In summary, cartridge respirators are utilized effectively in both mentioned scenarios, which justifies the selection of the combined option as the correct answer. This versatility highlights the importance of selecting the proper respiratory protection based on the specific conditions encountered in various tasks, including pest control.