Britain is expected to enjoy the hottest day of the year so far, as experts warn the country could be blasted with sand from the Sahara and pollution from Europe.
Large swathes of the UK will bask in glorious sunshine on Friday, with central and eastern areas expected to relish temperatures around 21C.
But the high pressure prompting the warmer weather is also combining to cause some less welcome phenomena.
Sky News meteorologist Chris England said: "Temperatures could well reach 21C, or 70F, in the east on Friday, which would be the highest so far this year.
"However, as well as bringing higher temperatures, high pressure over the UK will also mean two other things.
"The flow from the high pressure coming from the continent is bringing with it pollutants, and we may also see some Saharan dust blowing in from the south.
"The high pressure puts a lid on those pollutants, effectively trapping them in the low atmosphere rather than allowing them to disperse so levels drop."
He said the incoming dust from the south was unlikely to have a major effect on most people.
"There shouldn't be a huge amount of dust from the Sahara and most of us won't notice it," he said.
"We could see a little film of dust on car windscreens, but nothing major.
"The relatively high level of pollutants in the air should only be a concern for people with breathing conditions such as asthma."
A Defra spokeswoman added: "Locally generated air pollution, combined with pollution from the continent and Saharan dust, could cause high or very high levels on Friday.
"This is expected to clear on Saturday and pollution levels will return to low throughout the morning."
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