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Science 16 June 1972:
Vol. 176. no. 4040, pp. 1237 - 1238
DOI: 10.1126/science.176.4040.1237
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Articles

Lead and Mercury Burden of Urban Woody Plants

William H. Smith 1

1 School of Forestry, Yale University, New Haven, Connecticut 06511

For six New Havent woody plant species, the mean lead concentrations for tissue produced in the preceding growing season exceeded most lead concentrations determined for trees in areas with geologic lead deposits or adjacent to primary highways. Preliminary estimates indicate that some New Haven plants have slightly higher than natural amounts of mercury. The burden of lead and the difficulty in removing it by washing suggest a potential for pathological significance.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)