At the same time, no socio-economic category is immune from negative environmental conditions. For example, even the highest-end housing units can be regularly exposed to high levels of air pollution since they tend to be located on high traffic axes or have easy access to transport flows, as it is the case in Rome (Cesaroni et al., Generally speaking, according to the International Energy Agency, the European Commission estimated the cost of environmental pollution, taking into consideration health costs alone, to vary between EUR 440 and EUR 1 250 billion (European Commission, 2013). In the United States, the Environmental Protection Agency estimated that complying w'ith existing standards would cost USD 65 billion, but would bring potential economic revenue of USD 2 trillion (US EPA, 2011).