South Kent and Sussex residents are being asked to keep doors and windows closed due to a gas cloud that is believed to have come across from Rouen in France.
The warning follows reports of a gas leak from a factory 75 miles west of Paris. Kent Fire and Rescue Service says it is aware of the problem and liaising with its partner agencies to see what can be done.
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People travelling into the capital have been getting off a stop early to walk together in remembrance of the victims of the 7/7 bombings.
Paul Dadge become the unwitting face of the 7/7 rescue effort after a picture of him helping a woman in the aftermath went around the world.
A list of commemorative events as the UK marks a decade to the day 52 were killed and hundreds injured in London terror attacks.