Most pollen allergies in the spring come from trees, which can start pollinating as early as January depending on where you live.
Ragweed is the main pollen nemesis in the fall, reaching peak level in September. Fall is also mold season. Mold develops on wet leaves and soil.
Dry, hot days are not good for allergies. Pollen from grass is the main offender in the summer, and molds can grow quickly if you live where it gets hot and humid.
Outdoor pollen levels are usually low when it turns cold, but all that time spent indoors makes things worse if you have dust, mildew, or pet dander allergies.
Year-round allergies are always lurking, but tend to flare up during the winter. When it’s cold outside, you spend more time inside. Windows that are locked shut, fireplaces, and heating vents that are not fully cleaned create excess dust and poor overall indoor air quality.
Pet dander allergens are year-round as well, and also tend to flare up during the winter months, when walks and trips outside get much shorter. Pets scatter their dander everywhere they go, and keeping your home as dander-free as possible can be a lot to keep up with.