Industrial activities that emit bad odors, which has led in recent years the smell of pollution is becoming more relevant, since it is characterized by a type of pollution that can not only produce a health risk to people and animals (toxic emissions) but also creates a nuisance to those affected. all this hs led to increased sensativity in society about this enviromental problem and hence an increase in regulation. the perception of a smell, and its classification as pleasant or upleasant, is very subjective and difficult to determine when it crosses the threshold of tolerable and, therefore, difficult to regulate.
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