When is pollen season
There are different seasons for different types of pollen. In spring, around April and May, birch trees release their pollen, affecting around 25 per cent of people who have allergic rhinitis.
Their pollen season lasts about four weeks and the highest pollen counts are recorded on warm, dry days with a mild breeze.
Grass pollen proliferates in May and until the middle of August. Grass pollen is thought to affect around 90 per cent of people with hay fever or allergic rhinitis.
Other types of pollen that are around in summer include nettle pollen in July and other weed pollen, which tend to be at their highest in August. Mould spores are also released during the late summer months when harvesting starts.
In autumn, the weather cools and humidity increases. As a result, there’s an increase in airborne mould spores. In outdoor areas like gardens, there are types of mould and fungi which some people are allergic to. At this time of year, you can find mould spores indoors in house dust, ripe fruit and in houseplant soil.
In winter, there may also be some tree pollen around from early flowering hazel, willow and alder trees - this is most likely to be in February and March.
Timings differ slightly in different areas of the UK. The height above sea level you are at also affects the amount of pollen in the air, and exact timings change from year to year depending on the weather and other factors.