But it is not always visible in an obvious problem in a similar way to the other people. The effect of contact with fine particles can lead to more serious illnesses which occur in the longer term. Epidemiological studies have shown associations between 10PM concentrations and increased mortality and hospitalisation for heart and respiratory diseases. In fact, it has been included by the International Agency for Research on Cancer (IARC) among the group 1 carcinogens, that is, agents definitely carcinogenic for humans. The studies also show that in Europe No.1 cause of annual deaths are recorded for more than 500,000 people because of air pollution and the numbers concerning Italy are alarming: 90,000 premature deaths and 1,500 deaths per million inhabitants, of which 1,116 only for PM 2.5. Bacteria Microbes such as bacteria and viruses are attached to the floor and wall. Odor Amine smoke, gasoline smell, second-hand smoke and other residues generated by the pollution. Particulate matter (PM 10) Larger microscopic particles, up to 10 microns, are suspended in the air we breathe. They include dust, mold spores and pollen. Nitrogen dioxide and other oxidising gases These potentially harmful gases are released into the air in the presence of combustion, for example from gas stoves and car exhaust systems. Formaldehyde (HCHO) and Benzene A common pollutant in indoor environments. It can be issued for years from furniture, floors, and glues. Harmful substances such as formaldehyde and benzene are generated in interiors such as cushion leather covers etc. Particulates (PM 2.5) Microscopic particles up to 2.5 microns in size are suspended in the air we breathe. They include smoke, bacteria, and allergens. Volatile Organic Compounds VOCs are generally potentially harmful odors. They are found in cleaning products, paints, and furniture.