Media release – AirHealth, 4 October 2024

Increased rainfall signals a strong grass pollen season ahead for Tasmania

Experts are advising Tasmanians to be prepared for a potentially strong summer pollen season in parts of the state.

AirHealth and the University of Tasmania’s Menzies Institute for Medical Research, who jointly operate the AirRater Service, are predicting grass pollen levels will be higher than seen in recent years this spring and summer. Grass pollen is the primary trigger for respiratory allergies, including hay fever and asthma.

The Bureau of Meteorology is predicting above median rainfall for eastern Tasmania this spring. Coupled with enhanced soil moisture levels, grass growth may surge as warmer weather sets in, leading to more grass pollen in the air.

High and extreme pollen days pose significant health challenges for those with hay fever and asthma, making it important for Tasmanians with these conditions to stay alert throughout the season.

Dr. Grant Williamson from the University of Tasmania highlights the significance of the upcoming season: “The variability in this year’s weather patterns means that some regions in Tasmania could see higher pollen levels than usual, especially if wet conditions continue. It’s important for people with hay fever and asthma to be prepared and stay informed about the pollen levels in their specific areas.”

Dr Edwin Lampugnani, Chief Operating and Scientific Officer at AirHealth, commented: “Our advice to Tasmanians is to be ready and use available tools like the AirRater app to stay informed about current environmental conditions, including pollen levels. Knowing the conditions allows you to make better decisions, helping to reduce your pollen exposure during daily activities,” he said.

National Asthma Council Australia Director and respiratory physician Professor Peter Wark said the best defence that those with allergies and asthma can have as they head into pollen season is good day to day control of their asthma.

“Most people with asthma over the age of six years should be using a preventer to keep their asthma under control. A blue reliever inhaler (puffer) does not stop the inflammation that causes asthma and will not prevent an asthma attack.

“Now is the time to check in with your GP and make sure you are on the best treatment to control your asthma and know what to do during a spring thunderstorm or asthma emergency.

“Even people with hay fever, who have never had asthma, should see their GP if they experience worsening asthma symptoms like breathlessness, wheezing and tightness in the chest,” he said.

Current Conditions and Predictions

Tasmania experienced significant rainfall this winter, particularly in the southeast and central regions, leading to increased soil moisture levels compared to 2023. Root zone soil moisture is a crucial factor for healthy grass growth and subsequent pollen production.

Looking ahead, the forecast rainfall distribution is critical. The Bureau of Meteorology is predicting eastern Tasmania will receive above-median rainfall over the next three months, and these areas may maintain or even improve their soil moisture levels. This will further support grass growth and increase the likelihood of higher pollen levels. In contrast, western Tasmania is predicted to experience below-median rainfall and may see declining soil moisture levels, potentially reducing grass growth and pollen production in this region.

What to Expect This Season

Given the current conditions and forecasts, the 2024 Tasmanian grass pollen season is expected to vary across regions:

  • Eastern Tasmania is likely to experience higher pollen levels, and more days of severe and extreme pollen, due to favourable conditions like above-median rainfall and higher soil moisture levels.
  • Western Tasmania is likely to experience a lighter pollen season.

Several factors could influence the outcome of the pollen season:

  • Rainfall: If the predicted above-median rainfall occurs, it could enhance grass growth and lead to higher pollen levels. However, if the rainfall doesn’t eventuate, grass growth may be reduced, resulting in a lighter pollen season.
  • Soil moisture: Monitoring soil moisture levels is essential, as it impacts grass growth and flowering. Extended dry or windy periods reduce soil moisture.