A “pollen bomb” of toxic pollution is expected to hit Scotland this week.
Millions of asthma sufferers are being urged to take precautions to avoid potentially fatal attacks.
Rising temperatures will see trees spew out irritant pollen as a cloud of traffic smog and factory fumes blows in from France.
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When pollen and pollution levels rise at the same time, they create a deadly cocktail of irritants.
Pollution attaches to pollen, forming supercharged allergy particles which are more likely to hit people in built-up areas.
Sonia Munde, head of services at Asthma UK, said: “A deadly pollen bomb is due to hit this week, putting people with asthma at risk of a potentially life-threatening asthma attack.
“About 3.3 million people with asthma are affected.”
