Airborne and urinary N-nitrosamines levels were very low and, in
most cases, below the limit of detection (0.06 g/m3 and 0.1 g/L,
respectively). Conclusions: Although airborne and urinary N-nitrosamines
levels were found to be very low, exposed workers should still be monitored
constantly because some of these substances are known to be genotoxic and
carcinogenic.