The pollen count tells us how many grains of pollen are in a cubic meter of air during a 24 hour period. Pollen is a very fine powder released by trees, weeds and grasses. These pollens are carried by the wind from plant to plant. The pollen of some plants is carried from plant to plant by bees and other insects. These plants usually have brightly colored flowers and sweet scents to attract insects. They seldom cause allergic reactions. When conditions are right, plants start to pollinate. Weather affects how much pollen is carried in the air. As a rule, weeds pollinate in late summer and fall. The weed that causes about 75 percent of the fall allergy symptoms is ragweed. Some other weeds that cause allergic reactions are cocklebur, lamb's quarters, plantain, pigweed, and dock. Most pollen is released early in the morning to mid morning. 
Pollen travels best on warm, dry, breezy days and the pollens can travel for hundreds of miles. Pollen counts are lowest during chilly, wet periods.
• Trees pollinate in late winter and spring. Oak, Maple, Ash, Alder, Cedar, Birch, Beech, Sweet Gum, Cottonwood, and Elm are examples of pollens that can trigger allergies.
• Grasses pollinate in late spring and summer. Those that cause allergic reactions include Kentucky bluegrass, Timothy, Johnson, Bermuda, Redtop, Orchard, Rye and Sweet vernal grasses.
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