Credit: Dan Jaffe/University of Washington Bothell
Top: The June 2015 measurement of ozone at the summit of Mount Bachelor (red dot) was significantly higher than any of the previous measurements. Middle: Differences from average ozone levels in June 2015, when "the blob" was creating unusual conditions along the West Coast. The star shows the location of Mount Bachelor Observatory. Bottom: Typical June ozone concentration across the U.S.