Britain set to bake at 28C today with people warned to stay indoors as "toxic plume" arrives from France
Toxic pollution means many should stay indoors, say experts as Britain braces for what could be the hottest April day in decades
19 April, 2018
Britain looks set to bake in the warmest April day in nearly 70 years, forecasters predict - but toxic pollution has prompted a warning that people should stay indoors.
The mercury could hit a whopping 28°C - far surpassing the average maximum temperature for this time of year, which stands at 11.4°C.
The South East will enjoy the best of the weather, while most of England and Wales should see the temperature rise into at least the low 20s, the Met Office said.
But it's not all good news, with experts warning Brits to be wary of enjoying the hot temperatures, with a toxic plume of pollution likely to cause problems for people with heart and lung problems.
The toxic air will happen because air from the Atlantic is mixing with polluted air in Spain and France.
The warmest April day on record was 29.4°C in 1949.
Meteorologist Alex Burkill said: "There's a fairly good chance of 28°C, there's about a 60% chance.
"Quite widely we are going to see low 20s, and for many it will be a little warmer than Wednesday."
A high of 25.3°C was recorded in St James' Park in London on Wednesday, making it the hottest day of the year so far.
Thursday is expected to be the hottest day of the warm spell, with weekend temperatures dipping slightly before showery outbreaks on Sunday.
Competitors in the London Marathon can expect hot and humid conditions with a forecast of between 21°C and 23°C, Mr Burkill said.
"There could be a shower but it's not very likely. It's not great conditions for running. In fact if any showers do come they might be very welcome," he said.
Some hayfever sufferers could be affected by high pollen counts, he added.
Mr Burkill said: "For anyone who suffers from tree pollen they will probably be feeling the effects, but that's only about 20% of hayfever sufferers. Grass pollen season comes later in summer."