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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Environ Res. 2014 Apr 5;131:95–103. doi: 10.1016/j.envres.2014.02.017

Fig. 4. Temporal trends of residential indoor (a) pyrene and (b) Σ8PAHnonvolatile concentrations from 2001 to 2012, stratified by age group.

Fig. 4

Annual arithmetic mean concentrations of indoor PAH levels with 95% confidence interval are presented by age group.