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. Author manuscript; available in PMC: 2016 Apr 21.
Published in final edited form as: Environ Sci Technol. 2015 Apr 9;49(8):5203–5210. doi: 10.1021/es506095e

Figure 4.

Figure 4

Average carcinogenic potency of measured PAHs, grouped by distance to the closest active natural gas well. The three distance groups are close (n=5), middle (n=12), and far (n=6). Error bars represent one SD. Asterisks indicate significant differences, p <0.05.