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. Author manuscript; available in PMC: 2020 Jan 14.
Published in final edited form as: Sci Total Environ. 2017 Mar 10;590-591:843–852. doi: 10.1016/j.scitotenv.2017.02.164

Fig. 2.

Fig. 2

Evolution of reference blood lead levels (BLLs) considered safe by The Centers for Disease Control and Prevention (CDC) over the past six decades (Adapted from Lanphear et al., 2005; ATSDR, 2007; CDC, 2012; Drum, 2016; Raymond and Brown, 2016).