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National Pollutant Release Inventory (NPRI) Emission Estimate Guide for Primary Aluminum Producers

4. Overview of this guide

This manual provides examples of calculations, methods and useful links for estimating emissions of substances listed in the NPRI from many operations associated with the production and primary processing of aluminium.

An Excel spreadsheet was designed to harmonize the reporting methods for various air pollutants produced by certain processes mentioned in this document. The  spreadsheet is based on published default emission factors and appropriate emission factor equations for the substances in parts 1 through 5 of the NPRI. It can be accessed through the links provided in section 7 of this guide. However, this file does not yet contain all the information for estimating releases from all emission sources. In addition, the current version of the spreadsheet does not provide any methodology for estimating releases to land and water bodies or off-site transfers. However, this document is updated annually by the joint working group and users are encouraged to refer to it regularly for the most recent information.

This document contains the emission factors for estimating some substances listed in the NPRI. Some of these factors are taken from the United States Environmental Protection Agency (EPA) document entitled Compilation of Air Pollutant Emission Factors, AP 42, Fifth Edition, Volume I, Chapter 12, section 12.1: Primary Aluminium Production Sources, the EPA WebFIRE application or other sources. This guide also uses emission factors obtained from direct measurement at Canadian aluminium smelters.

In addition, if the facility believes that it has measured data of better quality than those presented in the spreadsheet, it can of course use them instead. There are also other  spreadsheets and guides for estimating releases from fugitive emission sources and internal and external combustion. These tools are available here.

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