What is the short-term exposure limit (STEL) for benzene?

The short-term exposure limit (STEL) for benzene is defined as the maximum concentration to which workers can be exposed for a short period, typically up to 15 minutes, without experiencing harmful effects. The correct answer of 5 ppm is established based on comprehensive health risk assessments that consider the potential acute effects of benzene exposure.

Benzene is a highly regulated substance due to its known carcinogenic properties and potential to cause other health issues with short-term exposure. The 5 ppm limit reflects a balance between safety and the practicalities of workplace exposure conditions. This limit helps minimize the risk of adverse health effects that can arise from short-duration exposure, especially given benzene's effects on the blood and its role as a known carcinogen.

In contrast, the other values presented are higher than the recommended STEL, making them unsuitable for ensuring worker safety in environments where benzene is present. Adhering to the 5 ppm standard is crucial to maintaining a safe and compliant workplace when handling or exposed to benzene.