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The three pollen seasons: Trees, grass and weeds A birch tree in the spring forms pollen seen here. Pollen can be broken down in to three categories depending on where it comes from - tree, grass ...
For example, within the City of Chicago region, 2010 statistics show most common street tree species is white ash at 6.2%. Along with third ranked green type at 4.9%, ashes combine to make up 11% percent of the city's street trees, with an overall population of 13,648,044 million standing ashes within Cook County alone.
European ash in flower Narrow-leafed ash (Fraxinus angustifolia) shoot with leaves. Fraxinus (/ ˈ f r æ k s ɪ n ə s /), commonly called ash, is a genus of plants in the olive and lilac family, Oleaceae, [4] and comprises 45–65 species of usually medium-to-large trees, most of which are deciduous trees, although some subtropical species are evergreen trees.
Fraxinus greggii, the littleleaf ash or Gregg's ash, is a species of flowering plant in the family Oleaceae, native to Texas and Mexico. [2] [3] A xerophytic shrub or scrubby tree reaching 6 m (20 ft), it is suitable for screens and containers. [4] [5] There is a cultivar, 'Libby Davison'. [6]
Tree pollen is expected to be the worst in the Pacific Northwest this year. For allergy sufferers living in this region, limiting the amount of time spent outside this spring may be a good idea.
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.
Pollen.com estimates show that Columbia had a high pollen count of 10.4 on Monday and 10.6 on Tuesday. It’s pollen count rating system ranges from 0-2.4 on the low end to 9.7-12 on the high end.
Fraxinus latifolia is a medium-sized deciduous tree that can grow to heights of 20–25 metres (65–80 feet) in height, with a trunk diameter of 40–75 centimetres (16–30 inches) in its 100−150-year average life span. [4]