These symptoms can make it difficult for you to concentrate or sleep properly. If you have hay fever symptoms all year round, you may also be allergic to house dustmites, pet hair and moulds. This is called perennial allergic rhinitis.

In Melbourne,  Hayfever Symptoms mainly occurs on warm days in spring and early summer when strong winds from the north or west increase the amount of grass pollen to more than 50 grains/m3 of air that is breathed. Levels of 600 grass pollen grains/m3 of air occur in very wet years. Pollen from ryegrass is the main culprit identified in causing hay fever. Ryegrass produces over 0.5 t/ha of pollen particularly laden with the types of proteins that cause allergic responses in susceptible people. Ryegrass is found in lawns and turf used in home gardens, roadside verges, parks, sporting fields and tracks. Pollen from a range of other grasses, weeds and trees also contributes to allergic reactions. In addition, non-pollen causes, such as fungal spores and house dust mites may also cause such reactions.

(source Australia Government, Department of the Environment)