Search results
Results from the WOW.Com Content Network
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 .
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]
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.
For premium support please call: 800-290-4726 more ways to reach us
Pollen mites do not feed on bees, but rather their provisions, and are harmful because they consume the food resources and starve or stunt the developing larvae; there is evidence that pollen mites also directly harm the egg by puncturing it. [1] [2] [3] The common name is somewhat misleading, as pollen mites consume more nectar than pollen.
Oral allergy syndrome (OAS) or pollen-food allergy syndrome (PFAS) is a type of allergy classified by a cluster of allergic reactions in the mouth and throat in response to eating certain (usually fresh) fruits, nuts, and vegetables.
Aerobiology is the study of organic particles and organisms in the atmosphere. The National Pollen and Hayfever Bureau was founded in Rotherham on 21 April 1983. Forecasts for Britain's six million people with hay fever (allergic rhinitis) began from 1 June 1983; it was funded by Fisons Pharmaceuticals. [2]