Pollen, a fine or coarse powder seed particles can have an allergic reaction, such as sneezing and coughing. Pollen levels in the grass, mold, trees and weeds suffer counted "hay fever" alert. According to the National Institutes of Health, pollen rain are lower level in the late afternoon or after a soaking.
The American Academy of Allergy, Asthma and Immunology keeps track of daily pollen from grasses, molds, weeds and trees. The AAAAI reports the results on its website. Pollen counts indicate the number of grains of pollen or mold spores per cubic meter.
Grass pollen levels, and counts are shown as one of five concentrations. The concentration absent, low, medium, medium or high. Some days Pollen not reported in a month or season without historic grass allergens counted. Counts are updated three to five times a week.
Grass pollen and other allergens are calculated based on the reported data per cubic meter by all certified counting stations for trees, grasses, weeds and molds. Grass counts from 1 to 4 looks to be low is, 5 to 19 moderate, 20 to 199 are high, and has more than 200 are very high.
Grass pollen is regional and seasonal. Grass pollen levels are also affected by temperature, time and rain. In North America alone there are more than 1,200 species of grass, but only a small percentage of these grasses trigger allergies. The most common grasses that can cause allergies are Bermuda, Johnson, Kentucky bluegrass, orchard, sweet Spring and Timothy grass, according to the National Institutes of Health.
According to a U.S. Food and Drug Administration 2009 report allergy grass pollen seasons are spring and summer. In these pollen seasons are highest in the evening.
Pollen and mold counts of pollen counting the AAAAI aeroallergen the station using a rotorod sampler, a lightweight, portable sampler with extended arm, which holds two cubic rods coated with silicone grease. Each state has. A pollen counting station, which reported its findings to the National Bureau of Allergy AAAAI