Millions of hayfever sufferers could be at risk of deadly asthma attacks with pollen levels at a 10-year high.
High pollen counts could trigger potentially deadly attacks in sufferers across the UK and a charity has warned sufferers to stay inside this weekend.
And with thunderstorms predicted to hit the UK on Sunday, sufferers have been urged to keep all windows and doors closed as humid weather can combine with pollen to cause attacks.
Colette Harris, Deputy Director of Digital Health at Asthma UK, told the Sun: Pollen levels are sky high at the moment and causing misery for millions of people with asthma.
An estimated 3.3million people in the UK who have asthma say their pollen allergy triggers their asthma so as well as having to deal with classic hay fever symptoms such as itchy eyes, sneezing and a running nose, theyre at risk of a life-threatening asthma attack.
The UK is currently in the grip of a heatwave which has seen temperatures top 30.2C in places.
And the combination of hot weather and low rainfall, along with a wet spring, has meant the pollen count has reached levels not seen since 2008..
Met Office forecaster Steven Keates told Metro.co.uk: Weve got a high pollen count and when you get convection in the atmosphere it can make it worse.
The wind high up in the atmosphere can distribute the pollen around.
It is the highest levels of pollen weve had for 10 years.
The weather has been very good for pollen levels to be high because theres not been a great deal of rain to wash it away, just occasional wet weather.
The pollen count is still very high or high across much of the UK the Met Office has warned, with only parts of Scotland seeing medium or low levels.
Asthma UK says both hot weather and thunderstorms can trigger asthma symptoms in some people and have urged sufferers to take precautions.
It is estimated there are 10 million hayfever sufferers in England, but Scotland has lower hayfever rates because the pollen season is shorter and less intense.
Hay fever is caused by an allergic reaction to pollen in the air, which comes mostly from grasses throughout June and July.
The recent rain to hit the UK has caused grass and trees to grow, fuelling a rise in pollen. Symptoms include itchy eyes, a constant runny nose, headaches and irritating sneezes every summer.
According to Asthma UK, 80% of people with asthma also have a pollen allergy, meaning the threat of a fatal attack is very real during the summer months.