Thunderstorms can trigger respiratory problems by causing particles of pollen that are normally too big to enter the airways to explode. Thunderstorm asthma is triggered when there is a sudden change in weather conditions. The movement from a hot a windy day where there is an increased pollen load in the air to an incoming storm front which adds a lot of moisture to the air, will cause pollens to absorb the moisture and burst. This releases thousands of tiny allergen particles which are then inhaled by people and can trigger asthma attacks.  
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