Thunderstorm Asthma has swept across Australia, affecting more and more people every day.
In Melbourne and Victoria, thousands have been hospitalised with serious breathing problems and at least eight people have died.
The illness is believed to be caused by a rare combination of the right weather conditions and pollen in the air.
This is when a storm comes during a time of unusually high around of pollen in the air and high humidity, which causes grains to break up and enter people’s lungs.
The effects of this can be fatal.
The Thunderstorm Asthma outbreak has been called a health emergency by experts.
According to local media, hospitals and ambulance network have been under intense pressure trying to cope with the massive number of patients.
Dr Michael Sutherland, a respiratory physician and allergist, told Victoria newspaper The Age that the sweeping asthma illness was “by far the worst” in world history.
He said any person – regardless of previous breathing issues – who experienced coughing or shortness of breath during the outbreak should seek medical advice.