How to rescue toxic gas leakage in chemical plant?

If conditions permit, wet the towel with water and wring it out gently. Fold the towel into eight layers or it's useless. Cover your face and find a safe place quickly. -Towels can be used for 3 minutes at most, and toxic gases will enter the body after 3 minutes. If conditions do not permit, you can wet your clothes with urine. Can achieve the same effect.

If it has been poisoned, it should be quickly moved to a safe place to prevent further poisoning and sent to the hospital for treatment. If breathing stops, you should first move to a safe place, then do artificial respiration for rescue and send it to the hospital.

I still hope that such a thing will not happen.