The Environment Agency say they have ruled out several possible sources of the haze cloud that descended on Birling Gap and Eastbourne last month.
Speaking to Eastbourne Buzz, the Agency also say they believe it highly unlikely the cloud came from the continent.
Hundreds of people sought medical help on 27 August, suffering from irritated eyes, sore throats and nausea.
A spokesperson gave us the Environment Agency’s latest on the haze. They said, “The incident was led by East Sussex Fire and Rescue and Sussex Police. The cloud dissipated very quickly and the Environment Agency’s immediate response was to support our partners as requested.
“Our investigations into any sources of the pollution are complex and ongoing. We have been looking at man-made and natural sources although we have not yet identified anything that could be directly attributed to the mist.
“However, we are now ruling out any sources from sites regulated by us, including those operated by water and waste companies. We have also ruled out any source from the continent as weather conditions make this highly unlikely.
“We continue to liaise with the Maritime and Coastguard Agency who are doing similar investigations offshore. We will share further updates when new information becomes available.”
Earlier this week, the Maritime and Coastguard Agency said they are working to identify the 180 ships in the English Channel at the time of the cloud.