What is the long-term exposure limit for hydrogen sulfide?

The long-term exposure limit for hydrogen sulfide is established by authoritative organizations to ensure safety in occupational settings. The correct limit is set at 10 ppm (parts per million), which is recognized as a permissible exposure level for workers over an 8-hour workday, within a 40-hour workweek. This standard is designed to minimize the risks associated with chronic exposure to hydrogen sulfide, a potentially hazardous gas known for its toxicological effects, including irritation of the respiratory system and, at higher concentrations, serious health consequences.

Setting the limit at 10 ppm acknowledges that even lower levels of exposure can pose health risks, which is why it is critical for workplaces to adhere to this guideline to protect the health and safety of employees. Therefore, the correct answer reflects the balance between workplace productivity and the need to maintain a safe working environment.