What should be done immediately after a chlorine gas exposure?

After a chlorine gas exposure, the immediate step to take is to wash in a safety shower or with a garden hose. This option is considered the best response because it focuses on decontaminating the skin and removing any chlorine residue as quickly as possible. Chlorine gas can cause serious harm to the respiratory system and skin, so flushing the area with water helps to minimize injury from further absorption or exposure.

While seeking emergency services or leaving the area might be necessary after addressing immediate contamination, they do not prioritize immediate physical decontamination, which is crucial for minimizing health risks. Wearing an oxygen mask is not appropriate in this context because it does not remove or neutralize the chlorine that may be on the skin or clothing, which are critical factors that need addressing immediately to prevent further harm.