It is composed of microscopic powdery grains which are emitted into the air during pollen season. Pollen Counts measure the amount of airborne allergens present. The counts are reported as grains per cubic meter of air. In the fall, Pollen Counts above 30 are considered high. Although a prolonged rain does effectively wash pollen out of the air, a brief downpour may cause particles that have settled to the ground become airborne.
Excess rainfall fosters the growth of ragweed and mold.
Pets can bring pollen into the home. Ragweed counts are highest in the morning hours. Cutting grass or raking leaves can cause allergy symptoms in the fall because of mold contamination. If you are working in the yard, wear a mask and take a shower, including a shampoo, immediately after you finish your outdoor chores. Letting your laundry air-dry can make your allergies.