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                                    Fig. 4.3 Type of lichen: Evernia prunastri, globally sensitive to air pollutionSource: D. Bou%u00ebvin for Nemeton, CC BY 4.0Fig. 4.4 Type of lichen: Xanthoria parietina, high tolerance to air pollutionSource: D. Bou%u00ebvin for Nemeton, CC BY 4.01644 Frugal Project Documentation

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