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. Author manuscript; available in PMC: 2019 Apr 10.
Published in final edited form as: Sci Total Environ. 2016 Oct 23;576:138–147. doi: 10.1016/j.scitotenv.2016.10.072

Figure 1.

International Agency for Research on Cancer carcinogenicity classification of chemicals in water (n=111), hydraulic fracturing fluids (n=76), hydraulic fracturing wastewater (n=52), and in air (n=29) related to unconventional oil and gas development.1,2

Figure 1.

1 All potential water contaminants were obtained from the U.S. Environmental Protection Agency draft report “Assessment of the Potential Impacts of Hydraulic Fracturing for Oil and Gas on Drinking Water Resources” (2015).

2 All potential air pollutants were abstracted from the scientific literature through systematic review of studies (n=50) including measurement, modeling, or description of potential air pollutants related to unconventional oil and gas development.