It is with great delight we welcome you to the 16th Conference of the International Society of Indoor Air Quality & Climate (Indoor Air 2020) at COEX in Seoul, Korea from July 20 to 24, 2020. As fine dust in the atmosphere has become an especially serious social problem in Korea and throughout the world, and as buildings get bigger and more concentrated, the interest in the indoor environment has been growing more than ever. To solve these global issues, the Korean Society for Indoor Environment will have the privilege of hosting Indoor Air 2020 in Korea and plans to go to great lengths to ensure the conference surpasses all expectations.