gupea_2077_28926_1 | Manualzz
2018-9-6 · Later, when the techniques were optimised to take better care of dust and gases produced during the cutting and grinding etc., the levels were below or close to 10 µg/m. 3 (378). Workers in Finland replacing mastic sealants in prefabricated houses have also been found to be exposed to PCBs (213). The concentrations of PCB congeners