Abstract

Around 90% of the time, people around the world spend their time in different indoor settings. In addition to the penetration of pollutants into the outside air, various activities like heating, cooling, cooking, and emissions from building materials and products produce contaminants in indoor environments. The fact that people spend the majority of their lives inside has a significant impact on their health and productivity. Peer-reviewed IAQ studies that specifically cover the relationship between the internal characteristics of various types of building environments with IAQ still do not have a comprehensive evaluation to help understand the progress and limitations of IAQ research worldwide, despite the two decades of IAQ research from various perspectives. As a result, this review of scientific studies highlights IAQ research trends and gaps by presenting a wide range of pollutants found in both residential and commercial indoor environments. In addition, we were able to evaluate the various IAQs in buildings located in various nations and regions through literature data analysis, reflecting the current global scientific understanding of IAQ. By establishing indoor air regulations that take into account all sources of indoor contaminant in order to create healthy and sustainable building environments; this review has the potential to benefit building professionals.