Gas masks are used when the applicator will be exposed to what conditions?

Gas masks are essential protective equipment when an applicator may be exposed to toxic fumes in heavy concentrations. This is primarily because these masks are designed to filter out harmful particles and gases, ensuring that the wearer does not inhale dangerous substances that could cause serious health issues. When dealing with pesticides or any chemicals that emit toxic fumes, the risk of respiratory problems, poisoning, or long-term health effects greatly increases, thus necessitating the use of this protective gear.

The other conditions listed do not specifically require a gas mask for protection. Cool temperatures, low humidity, and high altitudes may have their own challenges but do not inherently pose the same level of acute respiratory risk that toxic fumes in heavy concentrations do. Therefore, the use of a gas mask is critical in environments where exposure to harmful chemical vapors is a concern, ensuring the safety and well-being of the applicator.