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believe the answer you're looking for has to do with the pressure-altitude-voltage derating related to corona discharge, which increases (gets worse) with higher altitude and peaks at around 80-100,000' Typically this is considered to occur at votlages above 300 V peak, but be sure you are accounting for all transients and internal voltages.
28 Health Effects of Occupational Exposure to Asphalt Because the excitation and emission waveÂ­lengths are not the same for all PACs, two sets of excitation and emission wavelengths were used in seven asphalt paving studies conducted by NIOSH [Almaguer et al.ealth Effects of Occupational Exposure to Asphalt 93 and the mucous membranes of the upper reÂ­spiratory tract (nasal and throat irritation). These health effects, which have been best described in asphalt road pavers [Norseth et al. 1991; Hanley and Miller 1996 a,b; Almaguer et al.