Recently in Melbourne, Australia, on what was the then hottest day of the year in November, the stifling heat was terminated with a thunderstorm and and sudden, fast winds of up to 91 kilometres per hour. What followed was 8,500 cases of asthma and nine deaths from the ‘thunderstorm asthma’ effect. Heavy rain caused rye grass pollen to absorb moisture and burst, dispersing smaller particles that became trapped in people’s lungs.
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