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properties of the nanomaterials. If the sample is in liquid, be sure to consider the hazards of the liquid as well as the nanoparticles. Practice good housekeeping in laboratories where nanomaterials are handled. Follow a graded approach paying attention where dispersible nanomaterials are handled. Insofar as practicable, maintain all working surfaces (i.e., benches, glassware, apparatus, laboratory chemical hoods, support equipment) free of engineered nanoparticle contamination and otherwise limit laboratory personnel exposure to engineered nanoparticles and associated hazards. In areas where engineered nanoparticles might settle, perform precautionary cleaning, for example, by wiping horizontal surfaces with a moistened disposable wipe, no less frequently than at the end of each shift or day. If it is not feasible to duct HEPA-filtered treated exhaust air outside the building, follow the guidance in ANSI Z9.7-2007, American National Standard for Recirculation of Air from Industrial Process Exhaust Systems, and conduct a hazard assessment to identify appropriate engineering controls. Examples of such controls include periodic air monitoring and an accurate

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