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Certain studies have determined specific conifers, which can be found in urban and industrial areas can be used to monitor the degree of air pollution being used for passive biomonitoring processes. The needles and bark of conifers taken from the industrial and urban areas of the Jiu Valley, mercury, chromium) and arsenic, after acid mineralization of the samples of pine bark (Pinus sp.), spruce (Picea Abies) and thuja (Thuja Occidentalis) and those taken from these conifers in the urban area and in the vicinity o...