Households in England, Scotland, Wales and Northern Ireland are being urged to lock down doors and windows this weekend.
People have been warned to keep their doors and windows closed after strong winds spread fire smoke. Firefighters were called to a large blaze in Moreton Valence, Gloucestershire, at 01:25 GMT.
Seven fire crews have been battling a blaze  of more than 200 tonnes of metalw waste at a street in Darlaston overnight.