This OECD Emission Scenario Document (ESD) is intended to provide information on the sources, use patterns, and potential release pathways of chemicals used in hydraulic fracturing. The document presents standard approaches for estimating the environmental releases of and occupational exposures to chemicals used in hydraulic fracturing.

The scope of the ESD only applies to chemicals used during hydraulic fracturing activities for oil and gas wells. This ESD does not consider the manufacture and formulation of hydraulic fracturing chemicals, or the use of chemicals in well development prior to petroleum/gas production.

While OECD ESDs traditionally focus on the potential releases of chemicals from industrial processes, this document also assesses the potential occupational exposures to hydraulic fracturing fluid additives. Worker exposure information is included in this document.