About this manual

National Pollutant Inventory (NPI) Emission Estimation Technique (EET) manuals provide guidance to assist facility reporters to report emissions and transfers of NPI substances to the NPI. This manual describes the procedures and recommended approaches to estimating emissions and transfers from the Oil and Gas industry.

Emissions and transfers from field development and normal operation activities are reportable to the NPI if the relevant reporting thresholds for NPI substances are exceeded. Emissions and transfers associated with oil and gas exploration are not currently required to be reported.

First published in February 1999
Version 1.2 - February 2010
Version 2.0 - July 2013

Emission estimation techniques used in the manuals

Estimates of emissions of NPI-listed substances to air, water and land should be reported for each substance that triggers a threshold. The reporting list and detailed information on thresholds are contained in the NPI Guide at the front of this Industry Handbook. In general, there are four types of emission estimation technique (EET) that may be used to estimate emissions from a facility.

The four types described in the NPI Guide are:

• sampling or direct measurement
• mass balance
• fuel analysis or other engineering calculations
• emission factors