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The Assessment of Air Quality Through Lichen Indication in Forest Ecosystems. The present paper proposes the Lichens Toxitoleration Scale (LTS) towards different concentration of SO2 in atmosphere. Taking into account the specific diversity, abundance and indicator species toxitoleration there is proposed a scale with 6 gradations for assessing the air quality (further referred as AQGS), which was applied in 62 forest ecosystems. Typically, ecosystems with low polluted air are located at altitudes above 200 m, and those with polluted air – below 200 m. In fact there are exceptions as there are such important factors as distance from the pollution source and direction of prevailing winds. The following paper presents a comparative presentation regarding the application of AQGS and EMEP in the Republic of Moldova.

Keywords: forest ecosystems, lichen indication, air pollution, SO2 emissions, toxitoleration, abundance, evaluation criteria, environmental monitoring.