The regulatory movement towards the rating of real estate in respect of its environmental impact and sustainability is now one of the most important issues facing Portuguese developers and property owners. The pursuit of efficiency and improvement is, from the health point of view, one of the first steps to take in this direction. With this in mind, many policies have been implemented and are anticipated to help better protect public health by preventing or reducing exposure to pollutants with risks to human health, namely breathing dysfunctions, lung cancer, asthma and other allergies.