Indices of atmospheric purity and fluoride pollution pattern in Arvida, Quebec

摘要: Indices of atmospheric purity (IAP) 42 sites located in all directions from the aluminum factory at Arvida and spread out about 250-km2 area, were determined on basis phytosociology epiphytes Populus balsamifera. These index values ranging 0 to 103 arranged into six groups investigated area was accordingly delineated IAP zones represent areas with different levels fluoride pollution. A relative picture approximate limits contamination is obtained by accumulation Parmelia sulcata thalli transplanted various area.