Over the years, there have been many important contributions directed towards improving IAQ in buildings, including Standard 62.1 and other publications (EPA and NIOSH 1991; SMACNA 2007). In addition, ASHRAE, the International Society for Indoor Air Quality and Climate (ISIAQ) and other organizations have held conferences that have advanced knowledge and practice related to IAQ. While these efforts have been extremely valuable, the building community still lacked a comprehensive and practical resource on achieving good IAQ for the building professionals who design, construct and commission buildings. To meet this longstanding need, ASHRAE teamed with several key organizations to develop the newly published Indoor Air Quality Guide. This article presents a short summary of the guide, including its development, format and content.