TVOC, formaldehyde and ammonia levels in two new blocks of flats

Two new blocks of flats have been built for people with respiratory diseases. A number of points were taken into particular account during the design and construction of the buildings. For example, the project designers and builders were given training in prevention of problems with indoor air, only building materials that had been tested and found to have low emissions were used, and a supply/exhaust ventilation system and a central vacuum-cleaning system were installed. Total volatile organic compound (TVOC) levels and concentrations of formaldehyde and ammonia were measured in one apartment on each of the six floors of both buildings before occupants moved in and after seven months of occupancy. TVOC values had decreased after seven months to the target level of < 200 g/m3. Ammonia and formaldehyde values were at their respective target levels (<30 g/m3) immediately after the buildings were ready for occupancy in building A and in building B after seven months of occupancy