41 , 42 A decreasing trend was observed in ∑ 6 PCB concentrations at 31 of the 32 sites (25 statistically significant), with a median annual change of −10.5% corresponding to a halving time ( t 1/2 ) of 6.2 years.
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Spatial and Temporal Trends of Persistent Organic Pollutants across Europe after 15 Years of MONET Passive Air Sampling.
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The absence of a significant trend for BDE 209 is largely consistent with the findings of Wong et al. 4 Despite the inconsistent trends, the modeled 1-Jan-2019 concentrations are relatively uniform, but approximately 10 times higher than the ∑ 9 PBDE concentrations, with a median of 2.0 pg/m 3 (IQR = 1.1–4.7 pg/m 3 ).