Grey clustering evaluation of plateau underground working environment based on index pretreatment

Equivalent oxygen concentration,thermal comfort effective temperature,air quality index and dust concentration were selected as indexes from three aspects including respiratory physiology,thermal comfort and toxicology for grey clustering estimation of plateau underground working environment.Clustering weights were determined by using the fuzzy consistent matrix to reduce the influent of subjective factors.Due to considering the special case of plateau regions,this method can draw a more comprehensive and objective conclusion.