What are normal levels for PCBs ppb. tHANX?
Answer:
PCBs are completely synthetic substances, so their "normal" environmental level is zero.
NIOSH recommends (REL) is less than 1 microgram per cubic meter of air for arochlor based on a 40-hour workweek.
PCBs in PPB levels can be dangerous
water contains PCBs in concentrations at around 0.05ppb
wastewater contains about 1 ppb PCBs
air is generally not heavy with PCBs. Air is the most dangerous because we breathe a lot of it everyday and a little concentration times a lot of the substance can be bad.
be careful of PCBs in flame-retardant clothing and coatings, very heavy concentration of PCBs
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