'Thunderstorm asthma' kills 4 people in Australia
Four people were killed and over 2,000 others experienced breathing difficulties after a rare outbreak of 'Thunderstorm asthma' hit Australia on Monday. Thunderstorm asthma occurs when a storm hits during a period of unusually high rye grass pollen. During thunderstorms, rye grass absorbs water from atmosphere, breaks into thousand pieces and goes straight to the lungs, triggering asthma attacks.