Several days of hot weather mean London is facing an inevitable rise in air pollution as the Olympics get underway. The latest forecast shows pollution levels will be at moderate levels over the next 24 hours in London. The situation is expected to remain unchanged over the next few days.
The main concern is ground level ozone. It forms from traffic fumes in sunny weather, and can cause breathing difficulties.
More top news
Ancient African DNA sequenced for the first time has revealed a huge wave of migration from Eurasia 3,000 years ago.
Pauline Cafferkey, who contracted Ebola whilst working in West Africa last year, has been flown to the Royal Free Hospital in London.
EastEnders has made UK soap history by casting a transgender actor to play a transgender character in a continuing role.