The sky-high pollen counts and tempests battering Britain could trigger possibly lethal ‘thunder fever’ for millions, it has been warned.

Asthma and hay fever sufferers have been cautioned that soaring pollen checks could join with rising temperatures creating gigantic clouds of allergens.

Individuals have been cautioned to safeguard against potential lethal assaults with the sweltering climate expected to keep pollen levels high until the finish of June.

The Met Office has cautioned of ‘very high’ level of dust crosswise over England and ‘moderate’ in Scotland over the weekend.

The Asthma Society of Ireland (ASI) additionally issued the warning on Friday after research recommends that up to 80 percent of individuals with asthma see an exacerbating of symptoms because of hypersensitivities, revealed the Irish Times.

Dr Marcus Butler, restorative chief of ASI, said: “Managing asthma becomes more difficult over the summer months as the nice weather brings a long and sharp increase in the pollen count.”

Grass-pollen production is expected to hit its peak after indications of an impending European heat wave nicknamed the ‘Saharan Outbreak’.

Airborne allergens expert Max Wiseberg told Daily Star : “The sheer volume of rain we’ve experienced followed by sunshine is likely to create a potential grass pollen crisis in the UK.