The pollen season. Each plant has a period of pollination which varies little from year to year. Grasses follow next in the cycle, beginning pollination in May and continuing until mid-July. Weeds usually pollinate in late summer and early fall. Molds are parasitic, microscopic plants without stems, roots or leaves.
Mold spores float in the air like pollen.
Outdoors, molds can be found in soil, on vegetation and on rotting wood. Indoors, molds are in basements, bathrooms, refrigerators, garbage containers and places where water tends to collect. Avoid vaporizers and humidifiers, since they encourage mold and dust mite growth. Use bleach to clean showers, tubs and sinks on a regular basis. Inspect the shower curtain for mold.