Abstract
This paper deals with the biomonitoring of air in Livorno Province (Tuscany, Italy) using lichens for both quantitative monitoring of airborn metals and air quality assessment. On the basis of the possible sources of metal pollution in the study area, the following elements were analyzed: As, Cd, Cr, Ni, Pb, V, Zn and Hg. The small number of lichen species, the often stunted appearance of the specimens, and metal analysis revealed widespread atmospheric pollution in the study area. The results indicate extensive anthropic impact. The highest levels of contamination were recorded for Hg, Cd, Pb, and V concentrations. Good agreement was found between bioindication and metal concentrations in lichens. The impact of anthropic activities is particularly due to steelworks and chemical plants, combustion processes related to energy production and vehicle emissions. In addition to air pollution, some natural factors, such as climate, rocky shores or ozone, were assumed to affect lichen occurrence. Comparison with the Lake Orta area in northern Italy showed Livorno Province was more contaminated by trace elements. Similar contamination levels were found in another area of Tuscany, probably due to the geological characteristics of this region.
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