Indoor air assessment of Leonardo da Vinci's Last Supper mural

        Leonardo da Vinci's world famous painting The Last Supper is a priceless work, not in any of the world's great museums, but in a humble chapel in Milan, Italy.     It is a large mural, located in the cafeteria of the Church of Our Lady of Grace, written in1945, using a paint of oil and egg color (mixed with organic matter, known as eggs and milk).  Because the pigment was mixed with organic matter, the mural began to fall down fifty years later, and the monastery worked hard to repair it many times.  Milan's weather from the first day of the painting is constantly destroying him, experienced many wars of looting and the erosion of the years, how to preserve this world masterpiece, is left to the world a major problem.

This church restaurant, currently completely sealed, has access to the site only by booking via website or telephone  Indoor and outdoor air pollutants in churches can be considered a key factor in the preservation of the mural. The pigments on the frescoes undergo chemical and physical changes, natural and irreversible degradation through the interaction of materials with the environment. The number of visitors and the length of stay also affect the air quality in the environment. How to calibrate the concentration of pollutant parameters in the environment through the museum's ventilation and air filtration system, as well as the reasonable management of the number of visitors per round, the length of stay per round of visits, is the goal of this trip to Italy.

Homo sapiens' IAQ-Lite indoor air monitor monitors real-time monitoring of particulate matter (PM10, PM2.5, PM1), gas contaminants (NOx, O3, CO2), and provide accurate measurement data to managers to assess the impact of visitors on the indoor environment. Focusing primarily on the CO2 gas that visitors breathe, the introduction of fine particulate matter into the environment is best correlated with ventilation efficiency in museums. The operation of the museum requires strict restrictions and controls on the number and duration of visitors in order to reduce damage to fine frescoes. At the same time increase the rationalization of the entrance, the effective application of air filtration system and ventilation rate, reasonable so that more visitors have the opportunity to see the world's fine. Homo sapiens is committed to indoor environmental air monitoring research, for more world cultural heritage protection to provide a complete indoor air monitoring technology and programs. It also contributes to the global indoor healthy air.