The importance of employee health, well-being and productivity has increasingly come to the attention of most organisations. More recently there has been an increasing amount of evidence on the importance of indoor environmental quality and its related effects on health. This research has driven the need for better assessment of current conditions and identification of the best methods for improvement. Advancements in technology such as environmental sensing, data processing and big data analytics when combined with research findings can enable organisations to efficiently evaluate spaces and generate recommendations in the real world. The session will demonstrate how IoT and Big Data technology has been applied to reveal issues through using a concrete example of chemical (tVOC) exposure. You will have the opportunity to discuss how data-driven approaches improve understanding of human experiences indoors and impact planning, design and maintenance of indoor spaces.