We breathe on a daily basis microparticles that are harmful to our health. These are a mixture of particulate matter (PM) and toxic gases that act in conjunction with biological agents, such as viruses, dust mites, and bacteria. This is not a problem unique to exterior spaces. Our interior spaces also suffer from it. Partially due the air that we introduce from the streets every time we open a door or ventilate. Also, because of construction materials, household appliances, pets, synthetic fibers, and other materials that decay through time and produce pollution. These fine particles, Volatile Organic Compounds, dust, and allergens remain suspended in the air for hours, and natural ventilation is often unable to eliminate them.