The False Positive in Bioindicators of Air Pollution    (View PDF)

W. David Hacker and Howard S. Neufeld

Abstract: Yellow-poplar {Liriodendron tulipifera) seedlings were fumigated with a gradient of ozone to determine what effect ozone has on the species. The fumigated seedlings displayed physical symptoms of ozone injury but a large number of the individuals from the charcoal-filtered treatment showed physical symptoms of ozone when indeed no ozone was present. This is an indication that what appears to be ozone damage on yellow-poplar may not be caused by ozone.

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https://doi.org/10.48044/jauf.1992.048