Is the pollen season the same from year to year?

Not exactly. The beginning and end of the season for each pollen type and its severity (how much pollen is produced) will depend on weather, mainly rainfall, over the previous months or even years. For instance, rainfall over winter and spring determines how much grass will grow (and hence how much pollen will be produced) and current weather (wind direction and temperature) determines how much of this grass pollen will be transported from rural areas into Perth.

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