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By Thursday, we should see another burst of pollen across the region. Maples and elm join the mix this week as Bradford pears pass their peak. Pollen counts will surge with warm dry weather.
A pollen count is a measurement of the number of pollen grains in a given volume of air. Pollen counts, and forecasts of pollen conditions, are routinely produced and reported to the public because high aerial pollen concentration is associated with increased rates of allergic reaction for those with conditions such as hay fever and asthma.
Pro tip: don’t skip your daily allergy medicine.
Allergies are hypersensitivity reactions of the immune system to specific substances called allergens (such as pollen, stings, drugs, or food) that, in most people, result in no symptoms. Trees within the order Fagales possess particularly potent allergens, e.g. the prototypical Bet v 1, the major white birch ( Betula verrucosa - now called B ...
Ambrosia artemisiifolia pollen. Ragweed pollen is a common allergen. A single plant may produce about a billion grains of pollen per season, [11] [12] and the pollen is transported on the wind. It causes about half of all cases of pollen-associated allergic rhinitis in North America, where ragweeds are most abundant and diverse. [8]
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Such maps have been in use since the mid-19th century and are used for research and weather forecasting purposes. Maps using isotherms show temperature gradients, [2] which can help locate weather fronts. Isotach maps, analyzing lines of equal wind speed, [3] on a constant pressure surface of 300 or 250 hPa show where the jet stream is located.
Caused by dander, saliva or urine of dogs, or by dust, pollen or other allergens that have been carried on the fur. [76] Allergy to dogs is present in as much as 10 percent of the population. [76] Insect sting: Hives, wheezing, possible anaphylaxis Possible from bee or wasp stings, or bites from mosquitoes or flies like Leptoconops torrens. Mold