The American Society of Heating, Refrigerating and Air-Conditioning Engineers have released a downloadable version of its reference book, The Indoor Air Quality Guide: Best Practices for Design, Construction and Commissioning. The book includes 40 different techniques for achieving enhanced IAQ, and also provides design and construction teams with methods for incorporating IAQ strategies into their projects. The guide can be downloaded free at www.ashrae.org/FreeIAQGuidance