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Table 2 Characteristics of described epidemics of thunderstorm-associated asthma

From: Meteorological conditions, climate change, new emerging factors, and asthma and related allergic disorders. A statement of the World Allergy Organization

There is a link between asthma epidemics and thunderstorms.
The epidemics related to thunderstorms are limited to seasons when there are high atmospheric concentrations of airborne allergenic pollens.
There is a close temporal association between the start of the thunderstorms and the onset of epidemics.
There are not high levels of gaseous and particulate components of air pollution during thunderstorm-related asthma outbreaks.
Subjects with pollen allergy who stay indoors with windows closed during thunderstorm are not affected.
There is a major risk for subjects who are not optimally treated for asthma; but subjects with pollen-induced allergic rhinitis and without prior asthma are also at risk.