喜歡造謠的「外媒」

那麼，為什麼雷暴雨之後容易出現哮喘呢？哈佛大學醫學院刊物有這樣一篇文章：Thunderstorm asthma: Bad weather, allergies, and asthma attacks，解釋雷暴哮喘：

What is thunderstorm asthma?

The term describes an attack of asthma that starts or worsens after a thunderstorm. It can occur in anyone with asthma, but it most often affects people with seasonal allergic rhinitis, which many people know as hay fever or allergies. Heralded by a runny nose, sneezing, and itchy eyes, seasonal allergies are often worst in the spring, summer, or early fall.

Rain tends to lower pollen counts by cleansing the air, and many people find that rainy weather tends to reduce asthma symptoms triggered by allergies. But thunderstorms can make asthma worse because of a unique sequence of events:

Cold downdrafts concentrate air particles, such as pollen and mold

These air particles are swept up into clouds where humidity is high

In the clouds, wind, humidity, and lightning break up the particles to a size that can readily enter the nose, sinuses, and lungs

Wind gusts concentrate these small particles so large amounts can be inhaled.