Noun
picogram (plural picograms)
A unit of mass equal to 0.000 000 000 001 grams. Symbol: pg
A 1000 Bq/m 3 (relatively high) concentration corresponds to 0.17 picogram per cubic meter. Source: Internet
Atmospheric concentrations of PCBs tend to be lowest in rural areas, where they are typically in the picogram per cubic meter range, higher in suburban and urban areas, and highest in city centres, where they can reach 1 ng /m³ or more. Source: Internet