Each season brings with it a different burden of pollen.
In the early spring the trees predominate, and we are already see high levels of tree pollen levels.
The late spring/early summer time is largely due to grass pollen. In the late summer and fall, ragweed and other weeds pollinate.
But we also have to worry about mold, which is a common allergy trigger. Mold counts begin to rise in the spring, and hit their peak in fall.
Image of pollen allergy via Shutterstock.