What is the recommended action if dust or aerosols are likely to occur when handling a substance?

Using a half-face piece cartridge respirator is the recommended action when handling a substance that may generate dust or aerosols. This type of respirator provides an effective barrier against inhaling harmful particulates and vapors, thus protecting the respiratory system from potential exposure to toxic substances. Proper fit and correct filter selection are crucial for ensuring that the respirator can effectively trap particles and aerosols, thereby reducing the risk of inhalation.

In contrast, working quickly and without pauses may increase the likelihood of unnecessary exposure and does not provide any means of protection against potential inhalation of harmful substances. Operating in a closed room may not adequately control airborne particulates unless additional ventilation and filtration measures are in place. Furthermore, avoiding any protective gear altogether would expose the individual to significant health risks, as it leaves the respiratory system unprotected against hazardous materials. Therefore, utilizing a half-face piece cartridge respirator is the most effective precaution to ensure safety when handling such substances.