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Pollen forecasts are a very useful way to help combat hay fever and other allergies. This is a prediction of the amount of pollen grains that will be present in the air over the next few days. Forecasts are usually performed by local news and weather stations and include local pollens and allergens.
A forecast is performed by looking at a number of different weather conditions and factoring a knowledge of the plant pollinating characteristics in the local area each season.
There are three main factors that affect the forecast from day to day and each season:
Pollen counts and forecasts should be used as a primary means of allergen avoidance both indoors and outside. When allergen levels are high, you need to take extra care to stay indoors and limit your time outside.
Staying inside permanently is clearly not an option. However, you can take several steps to limit your exposure on days when you know the pollen levels are going to be very high. See Tips on Allergen Avoidance