Abstract
The odor threshold levels for UDMH and NO2 have been generally quoted at 6 to 14 parts per million (ppm) for UDMH and 5 ppm for NO2. The value for UDMH is twelve to twenty-eight times the threshold limit value. Seven years of field experience by personnel of this section have indicated that the actual odor thresholds are considerably below these values. Since odor threshold levels are used by safety and operating personnel at Cape Kennedy as an indication of exposure, it was considered appropriate to evaluate this field experience. On the basis of these data and the results of some controlled studies, it was concluded that the actual odor thresholds are 0.5 ppm or less for NO2 and less than 0.3 ppm for UDMH.