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. Author manuscript; available in PMC: 2015 Feb 1.
Published in final edited form as: Environ Int. 2013 Dec 4;63:173–181. doi: 10.1016/j.envint.2013.11.007

Figure 2.

Figure 2

Indoor / Outdoor PAH Concentration Ratios. Box show 25th, 50th, and 75th percentile; the whiskers show 5th and the 95th percentiles. The symbols, Ο and *, represent measurements that are >1.5– and >3–fold of the interquartile range.