Figure : ragweed-pollen-season-lengthens

Ragweed Pollen Season Lengthens

Figure 3.4

U.S. Department of Agriculture
Lewis H. Ziska

This figure appears in chapter 3 of the The Impacts of Climate Change on Human Health in the United States: A Scientific Assessment report.

Ragweed pollen season length has increased in central North America between 1995 and 2011 by as much as 11 to 27 days in parts of the United States and Canada, in response to rising temperatures. Increases in the length of this allergenic pollen season are correlated with increases in the number of days before the first frost. The largest increases have been observed in northern cities. (Figure source: Melillo et al. 2014. Photo credit: Lewis Ziska, USDA).dd5b893d-4462-4bb3-9205-67b532919566

Copyright protected. Obtain permission from the original figure source.

The time range for this figure is January 01, 1995 (00:00 AM) to December 31, 2011 (23:59 PM).

This figure was created on May 01, 2014.

The spatial range for this figure is 30° to 52° latitude, and 89° to 106° longitude.

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