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The combination of summer grass pollen and the confining shape of the hills around Eugene make it "the area of the highest grass pollen counts in the USA (>1,500 pollen grains/m 3 of air)." [ 68 ] These high pollen counts have led to difficulties for some track athletes who compete in Eugene.
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 .
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.
Eugene's allergy season has lengthened significantly since 1970. This week, grass pollen counts rose to their highest levels of the year so far. Eugene ranks among US cities with longest allergy ...
Pollen is produced in abundance and its distribution is typically well understood. A pollen count for a specific layer can be produced by observing the total amount of pollen categorized by type (shape) in a controlled sample of that layer. Changes in plant frequency over time can be plotted through statistical analysis of pollen counts in the ...
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Level III subdivides the continent into 182 ecoregions; of these, 9 lay partly within Oregon's borders. Level IV is a further subdivision of Level III ecoregions. There are 65 Level IV ecoregions in Oregon, [3] many of which continue into adjacent areas in the neighboring states of Washington, Idaho, Nevada, and California.
Oregon has a wide range of temperatures, though the extremes are rare. [3] The highest was recorded on July 29, 1898, in Hermiston, Oregon, and again on August 10, 1898, in both Pendleton, Oregon and Redmond, Oregon, and once more on June 29, 2021, at Pelton Dam. All are east of the Cascades, when the temperature reached 119 °F (48 °C). [6]