OHST Practice Exam 2025 – The Comprehensive All-in-One Guide to Exam Success!

The correct choice for the canister color indicating that it is suitable for protection against carbon monoxide is blue. This color designation is part of a standardized system that helps users quickly identify the type of respiratory protection that the gas mask can provide.

In the context of gas mask canister color codes, blue specifically indicates that the filter can absorb toxic gases, including carbon monoxide, which is a colorless and odorless gas that poses serious health risks. Different colors are used for different types of threats, and familiarity with these codes is essential for ensuring safety in environments where toxic substances may be present.

Understanding the specific color coding for respiratory protection can significantly enhance a worker's ability to respond appropriately in hazardous situations. It is also important to note that using the wrong filter can result in ineffective protection and can endanger health and safety.