Sentences with phrase «ragweed national»
Not exact matches
Dr. Lewis Ziska, a plant physiologist with the U.S. Department of Agriculture's Crop Systems and Global Change Laboratory, and colleagues at the National Allergy Bureau and Aerobiology Canada, analyzed ragweed pollen counts at ten monitoring stations along a south to north transect, from Texas north to Saskatchewan, Canada, from 1995 to 2009.
https://www.ucsusa.org/
News article describing the results of a study, published Mon 21 - Feb - 2011, in Proceedings of the National Academy of Sciences, looking at ragweed pollen season and local climate changes.