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gThe article focuses on the challenges and opportunities in the field of nanoscale environmental science and technology. The technical and popular literature is chock-full of discoveries of novel physical, chemical, and biological properties associated with materials whose dimensions are in the nanoscale domain. Insofar as environmental applications are concerned, nanomaterials offer the promise of novel materials and processes exhibiting enhanced reactivity toward targeted contaminants, better mobility in environmental media, and easier deployment.