Health / First Aid

Thunderstorm Asthma

Thunderstorm Asthma is a significant seasonal health concern in Victoria, and it’s important that we understand what it is, when it can occur, and how to respond. Awareness and preparation help us support students, staff and families during high-risk weather conditions. 

What is Thunderstorm Asthma? 

Thunderstorm asthma is a sudden increase in asthma symptoms triggered by a specific type of thunderstorm. These storms cause large amounts of pollen, particularly grass pollen to be swept up into the air, where they break into tiny particles that are easy to inhale. This can lead to breathing difficulties, even in people who have never had asthma before. 

When are we at risk? 

Thunderstorm asthma is most likely to happen during spring and early summer on days when: 

• Grass pollen counts are high, and 

• A storm front is approaching, especially with strong wind gusts before the rain. 

The risk period in Victoria usually peaks from October to December. 

You can check daily forecasts on the VicEmergency Thunderstorm Asthma Forecast webpage: 

https://www.emergency.vic.gov.au/prepare/#thunderstorm-asthma-forecast  

Who is most at risk? 

You may be at high risk for thunderstorm asthma if you: 

• Have asthma 

• Have hay fever, especially due to grass pollen 

• Experience hay fever symptoms even if you have never been diagnosed with asthma 

• Have poorly controlled asthma or don’t use preventer medication as described.