use of respiratory protection. Cal/OSHA has also defined Short Term Exposure Limits as the maximum TWA exposure during any 15 minute period, provided the daily PEL is not exceeded and Ceiling exposures that shall not be exceeded at any time. Processes with potential airborne hazards that cannot be eliminated by engineering or administrative controls will not be authorized by EH&S until affected employees can be incorporated into UCR’s Respiratory Protection Program. The increasing use of nanomaterials in research labs warrants consideration of the hazards they may pose. As is the case with many new technologies, the health effects of nanomaterials have not been thoroughly investigated. Consequently, the uncertainty surrounding the toxicity of nanomaterials merits a cautious approach when working with them. Reproductive toxins include any chemical that may affect the reproductive capabilities, including chromosomal damage and effects on fetuses . A sensitizer is a substance that causes exposed people to develop an allergic reaction in normal tissue after repeated exposure to the substance. Examples of sensitizers include diazomethane, chromium, nickel,
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