Daily, Alberto Frigo grades the overall air quality using the following values: 01, 02, 03, 04, 06, 12 corresponding to 0%, 20%, 40%, 60%, 80%, 100% of air pollution. Such daily values are later recreated in a physical context sequentially and for 30 seconds each by a smoke machine; the higher the value, the higher is the intensity of smoke the machine emits. In the physical context then the smoke acts like the incense given out by the priest in a museum, yet it is odorless, translating only visually the level of pollution which Frigo is subjected to.

One month quality of air values and annotations while in northern and southern europe and southern india Set up of the smoking machine in a viewing context Location of the smoke machine inside museum

The recording of the daily air quality started after Frigo spent a year living in Shanghai, China. It was the year preceding the World Expo 2010, and the city was completely under reconstruction for the international event, resulting in a very high level of dust in the air, particularly on his way to work to Tongji University on the other side of town. The generated mist adds a level of mystery in the site as much as many mystical gardens in Chinese cities or as in the installation "Vaporización" by Teresa Margolles.