Class of Nanomaterial

• Engineered Nanomaterials Manufactured materials with engineered structure between approximately 1 nm and 100 nm.
• Incidental Nanomaterials Materials with a structure between approximately 1 nm and 100 nm that are produced as a by-product of a process. For instance, welding fume and diesel emission particulates would be considered incidental nanomaterials.
• Natural Nanomaterials Materials with a structure between approximately 1 nm and 100 nm that are a result of natural processes. Some particles arising from volcanic emissions, sea spray, and atmospheric gas-to-particle conversion would be considered natural nanomaterials.
• Generic Research that is applicable to the EH&S implications of all nanomaterials, irrespective of class.