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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 1.

Figure 1

Average PAH concentrations grouped by distance to the closest active natural gas well. a. Sum of 62 PAHs, b. benzo[a]pyrene, and c. phenanthrene. Error bars represent one SD. Asterisks indicate significant differences, p <0.05. The three distance groups are close (n=5), middle (n=12), and far (n=6), defined in the text.