Abstract
The sulphur dioxide in the air can be estimated qualitatively by studying the lichens growing on trees. A ten-point scale has been constructed and used in pilot surveys in England and Wales, south-east England and the city of Leicester.
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HAWKSWORTH, D., ROSE, F. Qualitative Scale for estimating Sulphur Dioxide Air Pollution in England and Wales using Epiphytic Lichens. Nature 227, 145–148 (1970). https://doi.org/10.1038/227145a0
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DOI: https://doi.org/10.1038/227145a0
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