open windows and doors. switch on exhaust fan immediately,there is cough and irritation of eyes and throat. clean your eyes with water. come out of the area of spray. do fresh breathing of air to get rid of suffocation.if oxogen is there. breath well to remove inhaled chlorine from respiratoy tract.if patient is serious shift in ambulance to E.R.do emergency resuscitation with ambu bag and oxygen,if b.p is low and pulse is slow. do c.p.r.if heart is in fibrillation use defibrillator machine give d.c shock to heart.start i.v fluids to get normal b.p.