Why is hayfever so bad in Melbourne?

There’s an incredible diversity of plants and pollens across Melbourne coupled with rapidly changing weather patterns, or locals know it: four seasons in one day. Pollen originates from indigenous plants and grasses, from hundreds of thousands of species grown in suburban gardens and by Councils, and blustering winds bring in pollen from South West, and Northern Victorian, farmlands. Just before some thunderstorms particular trees release extreme amounts of pollen.