Abstract
I investigated the fungi on the surface of concrete walls in the indoor or semi-indoor environment. On the wall of a semi-indoor underground parking lot, Cladosporium was most frequently detected, and very slow-growing fungus identified as Devriesia was sometimes detected. Aspergillus and Engyodontium were often detected as dominant species on concrete walls where the environment is likely to be humid and condensation occurs. When the spore scattering properties were examined on the concrete wall where the propagation of Cladosporium was confirmed, no scattering occurred with a slight wind (wind velocity; 2-3 m/s), but scattering was observed due to water spraying or physical rubbing event. The number of fungi on the concrete wall increased in summer when the difference between the wall surface temperature and the air temperature increased. In the removal of fungi on the concrete walls, washing with alcohol or hypochlorous acid based detergent was more effective in elimination and the effects continued longer than washing with water. Antifungal effect on the fungi by some fungicides was recognized even after 3 years of treatment, but it was confirmed that the effect faded after 6 years.
