One of the most common triggers for are pollen. They are small, light and dry, so the wind can carry them. Pollen counts can vary day-to-day, depending on several factors, including the weather. For example, dry, windy weather spreads pollen quickly. However, heavy rains and humid weather conditions weigh down pollen, keeping it on the ground. In general, plants and trees that pollinate via wind cause the most problems for people with seasonal allergies.
Grass Pollen: There are hundreds of different grass types. However, only some cause allergies. The most common types of grasses that cause allergies include Rye, Bermuda, Johnson, Kentucky, Orchard, Sweet Vernal, Bahia and Timothy. Grasses usually pollinate in the late spring and early summer however depending on where you live, grasses may pollinate across many seasons and could trigger symptoms all year round.
Tree Pollen: When it comes to trees, watch out for white cedar, cypress, pine, olive, birch, oak, elm, maple, ash, alder and hazel. These trees generally pollinate from late winter to the end of spring, depending on where you live.