Abstract
Ten years ago, a survey of lead contamination near highways started in Belgium. Most of the observations, samplings and analyses were devoted to plant materials and soil. Samples were collected in more than twenty different sites: in rural sites, and in a few urban parks or avenues. The first topic was to survey heavy metals dispersion (Pb, Zn, Cd) and the factors affecting lead contamination of roadside environment. A similar study was performed in urban conditions. The efficiency of an experimental green screen has been followed, for its protection and filtering abilities, during seven consecutives years, and it's still operating.
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