%0 Journal Article %T Evaluating Environmental Factors through a BL-Algebra %A Enrico Fischetti %J Asian Journal of Fuzzy and Applied Mathematics %D 2016 %X In this paper a method for environmental evaluation based on type-2 fuzzy sets and a BL-algebra defined therein is illustrated. Introduced by L. Zadeh in 1975, fuzzy sets allow to represent imprecise knowledge in a simple and effective way by carrying out algebraic computations on linguistic elements. In this evaluation model every environmental indicator (security, facilities, environment, social impact, and so on) is a type-2 fuzzy set. This approach has been utilized both to rank the quality of life in some Italian cities and then the environmental quality of four sites for a domestic airport near Reykjavik. As regards the Italian cities this approach produces results similar to those obtained by statistical methods but one gets a linguistic classification of cities and not a numerical one. Also as regards the sites for the airport, the results are similar but the linguistic expressivity is greatly enhanced %K [BL-Algebras %K Type-2 fuzzy sets %K Quality of life %K Environmental evaluation.] %U https://www.ajouronline.com/index.php/AJFAM/article/view/3775