Sussex Police and West Sussex Fire and Rescue teams are continuing to investigate a 'hazardous material' incident in Worthing.
Earlier, a cordon was put in place along the seafront between Grand Avenue and Windsor Road, and people were being advised to shut all windows and doors, or stay away from the area.
Police say a small number of people reported symptoms including sore eyes and vomiting, two of whom were taken to hospital. They have since both been discharged and advised to go home, wash their clothes and have a shower.
Anyone else affected is being advised to do the same – and use copious amounts of water to wash their eyes.
The seafront has now been re-opened, though police say they are continuing to investigate.