Weed pollen is at or near peak levels. In particular, we are seeing high levels of chenopod weed pollens (which include Kochia, Russian Thistle, Lambs Quarter and Careless Weed) along with moderate sage pollen. Grass pollen is lower but still present. Alternaria and Cladosporium mold also remain moderate to high. Tree pollen is done for the year. 

Pollen count conducted by Dr. David Scott at the Allergy & Asthma Center of Western Colorado on August 19, 2016.

On the left is ragweed pollen with mold in the background from our July 28th sample. Unlike most other places in the United States, the Grand Valley grows relatively little ragweed. Our most significant pollens this time of year are the Chenopod family of weed pollens, including Kochia, Russian Thistle and Lamb's Quarter. 

(Above) Grass pollen (center) surrounded by various types of mold spores from our June 24th sample. 

Here you can see local grass pollen in action. This video was captured May 30th, 2016, from the bank of the Colorado River near downtown Grand Junction. 

Oak pollen from May 19th. This likely originated from scrub oak, blowing all of the way from the Grand Mesa or Uncompahgre Plateau to downtown Grand Junction.

Some of the first grass pollen of the year that showed up May 3rd, 2016. Earlier than we had expected!
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