So far there is no evidence that the cloud came from an inland source, and authorities have also played down speculation that it could have drifted from as far as France. Neodaas is urging the Met Office to help determine whether wind speeds at the time could have drawn the plume onshore. Two pollution monitoring sites on the south coast picked up a quadrupling in ozone levels in a 30-minute period on Sunday afternoon, suggesting the toxic cloud came from a nearby ship. One site at Devonshire Park in Eastbourne, and the national monitoring site at Lullington Heath, East Sussex, are both within five miles of Birling Gap. The monitoring sites don’t record all possible pollutants.

Source: The Guardian August 29, 2017 17:28 UTC