just as much concerned with siting, ventilation, mechanical systems, air sealing, construction practices and building operation as it is with product selection. Nevertheless these concerns with material selection can have a major impact on materials production, especially when there is some attempt to build markets for green products. While the concerns of CMHC, the USs HUD and EPA, for example, seem more adaptive, there are a number of other IAQ initiatives that are consciously intended to expand green production. The LEED building assessment programme is one example. Indoor environmental quality is one its five assessment categories, amounting to 23 percent of its credits. (The other categories are sustainable sites, 22 percent; water efficiency, 8 percent; energy and atmosphere, 27 percent; and materials and resources, 20 percent). Because LEED is deliberately designed to rapidly expand green building practices in North America, it provides a lucrative market for products that meet LEED approval. This is also true for other building evaluation programmeslike the UKs BREEAMand the various eco-labelling programmes like Canadas eco-logo, the USs Green Seal, and the EUs Flower. Another example is the Greenguard Environmental Institute, based in Washington DC, which operates a certification and labeling program for interior products and building materials, and which touts itself as the only worldwide testing program for lowemitting products. It was launched in June 2000, as a Registry of low emitting indoor furnishings and building materials. It provides constantly updated information on newly certified products, like low-VOC paints and non-emitting office furniture, to architects, specification writings, procurement officers, etc. (Greenguard Environmental Institute,