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OSHA NIEHS Oil Spill Cleanup Training Tool A& <br />Nitrogen Dioxide (NO,) <br />• Gas with a distinctive reddish -brown color. <br />Health Risks of Nitrogen Dioxide: <br />• Respiratory irritant and is capable of causing pulmonary edema. <br />• A concentration of 50 ppm is moderately irritating to the eyes and nose and <br />may cause pulmonary edema and possibly subacute or chronic lesions in <br />the lungs. <br />• Odor of NO, is first perceptible to most people in the range of 0.11 to 0.22 <br />ppm. <br />• May be a hazard during burning operations! <br />WORKER EDUCATION & TRAINING PROGRAM 45 <br />