Which of the following respirators is not typically used for pesticides?

The standard surgical mask is not typically used for pesticides because it is primarily designed to protect the wearer from large droplets, splashes, or sprays of bodily fluids rather than to filter out hazardous airborne particles or chemical vapors found in pesticide applications. Surgical masks might provide some level of protection against larger particles, but they do not have the necessary filtration capabilities to protect against the fine particles or gases that could be released from pesticides.

In contrast, dust-mist filtering respirators are designed to filter out dust and mists, making them suitable for use with certain types of pesticides. Chemical cartridge respirators have specialized cartridges that can absorb harmful chemical vapors, providing significant protection when applying pesticides that release toxic fumes. Self-contained breathing apparatus (SCBA) provides the highest level of protection, offering a breathable air supply in environments that are extremely hazardous.

Given the specific nature of pesticide exposure, a standard surgical mask lacks the required features for respiratory protection when handling pesticides, making it the least suitable option in this scenario.