“…Acute neurotoxic effects were seen among Swedish workers in a tunnel construction project where NMA-based grouts were used (9). We have previously reported possible genotoxic (10) and neuro toxic (11) effects among Norwegian tunnel workers using NMAbased grouts. Among the Norwegian tunnel workers, we found indications of reversibility of several symptoms, such as skin-irritat ion, pares thesia, and pain in the hands when the workers were examined 16 months postexposure (11).…”