Green maintenance and operations products can improve indoor air quality, reduce the use of water and other natural resources and increase energy efficiency. Since there are thousands of products used in maintenance, repair and operations, it is important for purchasers to understand which types of environmental claims are credible. This guide contains some suggested environmental questions for suppliers of MRO products and equipment that can be asked in the RFP/RFI process to determine if a supplier can support your interest in greening the supply chain.