Contrary to popular media there is no simple answer to this question. While the website The Endocrine Disruption Exchange (TDEX) offers a comprehensive excel spreadsheet of the products, chemicals, and their health effects, it fails to mention the variety of factors that are important in determining what will make the identified chemical toxic to the public.
Will There Be Wide Spread Health Problems?
There is a general assumption that because of the nature or the toxicity of the chemicals used in natural gas development there will be widespread health issues. To explain why this assumption is wrong, we need to first define the word "toxicity."
Toxicity is defined by the Agency of Toxic Substances and Disease Registry (a federal agency) as the “degree to which a substance is poisonous or can cause injury.” The key word here is “degree,” it is the reason why the answer is simple not. The degree is the “how toxic.”
No Exposure means No Toxicity