According to D'Amato et al (2007), the characteristics of described epidemics of thunderstorm-associated asthma can be summarized as follows:

1. A link exists between asthma epidemics and thunderstorm.
2. Epidemics related to thunderstorm are dependent on seasons when there are high atmospheric concentrations of airborne allergenic pollens.
3. The start of the thunderstorm has a close temporal association with the onset of epidemics.
4. Subjects with pollen allergy, who stay indoors with closed windows during thunderstorm, are not usually affected.
5. Subjects who are not under correct anti-asthma treatment are at a major risk whilst subjects with allergic rhinitis and those without previous asthma can experience severe bronchoconstriction (constriction of the bronchial air passages).

Precautions to take in the event of a thunderstorm

1. Watch out and listen closely for weather reports.
2. Be aware that thunderstorms could trigger your asthma.
3. Increase you preventer inhaler, in consultation with your doctor or nurse, and seek medical attention if you experience an extreme attack.
4. Keep a close eye on your condition either by taking regular peak flow readings or recording your symptoms.

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