A smog alert has been issued for parts of Wales with “blood rain” also expected.
There is a risk of air pollution across parts of Wales tomorrow due to Saharan dust.
The Department for Food, Agriculture and Rural Affairs (Defra) has issued moderate-level alerts for most of Wales.
Health experts have issued emergency warnings to people with asthma and other conditions to stay indoors and avoid exercise.
Asthma UK warned of a “perfect storm” of conditions as Britain prepares for a blast of hot air which could send thermometers to 17C.
Director of advice, Andrew Proctor, said: “People with asthma need to take extra care.
“We are facing a perfect storm of asthma triggers, with air pollution and weather changes increasing the risk of potentially fatal asthma attacks for millions of people with the condition.
“Two thirds of people with asthma find that air pollution makes their asthma worse, and even more tell us that changes in the winter weather can trigger asthma attacks.
“If air pollution or cold weather makes your asthma worse, do check forecasts and carry your reliever inhaler with you at all times.”
Forecasters say the weather across Wales will be milder over Christmas, potentially the mildest on record.
Toxic smog is a type of air pollution which can be caused by natural or man-made pollution.
Blood rain is believed to be caused by red dust suspended in the water or by the presence of micro-organisms.
see-http://www.walesonline.co.uk/news/wales-news/toxic-smog-blood-rain-set-10607431
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