WASHINGTON, Nov. 21, 2016 /PRNewswire-USNewswire/ -- Researchers have adapted an 'off-the-shelf' hazard assessment tool for use with emerging nanomaterials in an effort to better understand threats they may pose to workers, the public and the environment. As described in the peer-reviewed, scientific journal Environmental Health, researchers focused on characterizing nanosilver products already approved for use by the U.S. Environmental Protection Agency (EPA) and currently found in hundreds of products -- and discovered health and environmental hazards not previously considered by EPA during its approval process. The study was coordinated by scientists working together through the environmental health network Coming Clean, and documents the adaptation of the GreenScreen® for Safer Chemicals comparative hazard assessment method. GreenScreen summarizes known - and missing - information on chemical hazards in an accessible, visual format. It also assigns benchmark scores to substances, and now nanomaterials, based on both known and unknown hazard information. This allows for easy hazard comparisons and an informed way to select safer substitutes to guide product manufacturing. To demonstrate the adapted method, researchers analyzed a nanosilver product named AGS-20 which has been approved by EPA for use in textiles, such as blankets, plush toys and undergarments, and then compared those findings with an analysis of another nanosilver product EPA used to fill in missing information on AGS-20 and, finally, bulk-form silver. The comparison shows important human health hazards that appear to have been overlooked in EPA's assessment and approval, along with numerous data gaps where health hazards are likely to exist. This finding creates concern that EPA's approach to regulating the rapidly emerging field of nanomaterials is inadequate, and undermines justification for EPA's decision to fill missing information on AGS-20 with information from other forms of nanosilver--which was done against the recommendation of EPA's Scientific Advisory Panel. It also shows that nanosilver materials, currently in hundreds of consumer products, may be harming workers, the public or the environment despite approval by EPA.