The problem with pollens and mold
Pollen, a microscopic reproductive cell released by trees, grass and weeds, is carried easily by the wind. As soon as plants begin to bloom and pollinate, spring allergy season is officially underway.
Trees pollinate months before grasses and weeds and earlier in warmer climates. For example, in the Northeast and upper Midwest, the tree allergy season generally begins in March or early April, while the tree pollen season can begin as early as January (or even December) in hot climates.
Grass is the next to pollinate. In the West and along the Gulf Coast, this typically begins during March. In the Southeast, it's not until April, and in the North, not until May.
Weeds are the last to pollinate. For most of the nation, this starts in June or July. However, it can begin as soon as April in the West and in Florida. In late summer to early fall, ragweed is a particular annoyance for many, affecting about 75 percent of allergy sufferers.
Mold spores, which grow in places such as damp soil, dead leaves and rotting wood, also can be a nuisance to those who suffer from seasonal allergies. Like pollen, mold spores are carried easily by the wind once airborne. Though always present, these spores increase in number as the temperature rises. "While there's not really a defined peak for outdoor molds, late summer to early fall would tend to be times when they might cause greater problems," Dr. Li says.
Pollen, a microscopic reproductive cell released by trees, grass and weeds, is carried easily by the wind. As soon as plants begin to bloom and pollinate, spring allergy season is officially underway.
Trees pollinate months before grasses and weeds and earlier in warmer climates. For example, in the Northeast and upper Midwest, the tree allergy season generally begins in March or early April, while the tree pollen season can begin as early as January (or even December) in hot climates.
Grass is the next to pollinate. In the West and along the Gulf Coast, this typically begins during March. In the Southeast, it's not until April, and in the North, not until May.
Weeds are the last to pollinate. For most of the nation, this starts in June or July. However, it can begin as soon as April in the West and in Florida. In late summer to early fall, ragweed is a particular annoyance for many, affecting about 75 percent of allergy sufferers.
Mold spores, which grow in places such as damp soil, dead leaves and rotting wood, also can be a nuisance to those who suffer from seasonal allergies. Like pollen, mold spores are carried easily by the wind once airborne. Though always present, these spores increase in number as the temperature rises. "While there's not really a defined peak for outdoor molds, late summer to early fall would tend to be times when they might cause greater problems," Dr. Li says.
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