Which characteristic of chlorine gas poses a significant risk to workers in wastewater facilities?

Chlorine gas is known for its high toxicity, which poses a significant risk to workers in wastewater facilities. Inhalation of chlorine can lead to serious respiratory issues, irritation of the eyes, skin, and mucous membranes, and in higher concentrations, it can even result in fatal outcomes. This toxicity is particularly concerning in confined spaces or areas with poor ventilation, where chlorine gas can accumulate, increasing the risk of exposure.

While chlorine can be flammable under certain conditions, and its colorlessness can make it hard to detect, the primary and most pressing concern in terms of worker safety is its toxic nature. This toxicity necessitates stringent safety protocols, including the use of personal protective equipment, proper ventilation, and monitoring systems to detect the presence of chlorine gas in the air.

The noticeable odor of chlorine is also a protective factor; while chlorine has a strong, pungent smell, it can mask the dangers of a low concentration that is still harmful. However, the fundamental risk remains the harmful effects of its toxicity, making it the primary characteristic that workers must guard against.