Associate Safety Professional Practice Exam

What is not true concerning carbon monoxide?

1. The current TLV for CO is 1500 ppm

2. CO is odorless and colorless

3. It can cause headaches and dizziness

4. IDLH for CO according to NIOSH guide is 1500 ppm

The correct answer is: The current TLV for CO is 1500 ppm

The statement regarding the current Threshold Limit Value (TLV) for carbon monoxide being 1500 ppm is not accurate. In fact, the voluntary TLV set by the American Conference of Governmental and Industrial Hygienists (ACGIH) is typically much lower than 1500 ppm; it is often cited as 25 ppm for an 8-hour time-weighted average. This reflects the recognition of the health risks associated with carbon monoxide exposure. Carbon monoxide, being an odorless and colorless gas, presents significant detection and safety challenges in environments where it may be present, such as in industrial or residential settings with faulty combustion appliances. The physiological effects of carbon monoxide exposure, including headaches and dizziness, are well-documented due to its ability to interfere with oxygen transport in the blood, leading to symptoms of hypoxia. Lastly, the Immediately Dangerous to Life or Health (IDLH) level set by NIOSH is indeed often recognized to be higher than the standard TLV for occupational exposure, which can create confusion, but the correct IDLH for CO is also addressed in specific safety guidelines. Understanding these distinctions is essential for safety professionals in ensuring workplace safety and recognizing the hazards of this gas.