Aluminum Production
Monitoring Checklist

v>EPA

United States
Environmental Protection
Agency

Subpart F, Greenhouse Gas Reporting Program

What Must Be Monitored?

Measure these parameters annually (unless otherwise noted).

Perfluoromethane (CF4) Emissions from Each Prebake and Soderberg Cell
If estimating CF4 Emissions from anode effect duration:

~

~

Anode effect minutes per cell-day
(monthly) (AE-Mins/cell-day)

Anode effect frequency (AE/cell-day)

~	Aluminum production (monthly)
(metric tons)

~	Anode effect duration (minutes)

If estimating CF4 Emissions from overvoltage:

~

~

Aluminum production (monthly)
(metric tons)

Potline overvoltage (mV/cell day)

~	Anode effect overvoltage factor
(kg CF4/metric ton Al)/(mV/cell
day)

~	Current efficiency (%)

Process CO2 Emissions from Anode Consumption During Electrolysis for Prebake Cells, If Not
Using a CEMS:	

~ Net annual prebaked anode

consumption per metric ton A1
(metric tons C/metric tons Al)

~

Aluminum production (metric tons)

~	Sulfur content in baked anode
(percent weight)

~	Ash content in baked anode
(percent weight)

Process CO2 Emissions from Anode Consumption During Electrolysis for Prebake Cells, If Using a
CEMS:

~ Net annual prebaked anode

consumption per metric ton Al (metric
tons C/metric tons Al)

~ CO2 emissions, as calculated by

operating and maintaining a CEMS
according to the Tier 4 methodology in
98.33(a) (4)

~

Aluminum production (metric tons)

Aluminum Production Monitoring Checklist
Greenhouse Gas Reporting Program

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40 CFR 98, subpart F
February 2018

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Process CO2 Emissions from Anode Consumption During Electrolysis for Soderberg Cells, If Not

Using a CEMS:

~

Paste consumption (metric ton/metric
ton Al)

~

Ash content of pitch (percent weight)

~

Aluminum production (metric tons)

~

Hydrogen content of pitch (percent
weight)

~

Emissions of cyclohexane soluble
matter (kg/metric ton Al)

~

Sulfur content in calcined coke (percent
weight)

~

Binder content of paste (percent weight)

~

Ash content in calcined coke (percent
weight)

~

Sulfur content of pitch (percent weight)

~

Carbon in skimmed dust from
Soderberg cells (metric ton C/metric
ton Al)

Process CO2 Emissions from Anode Consumption During Electrolysis for Soderberg Cells, If Using
a CEMS:

~

Paste consumption (metric ton/metric
ton Al)

~

Aluminum production (metric tons)

~

CO2 emissions, as calculated by
operating and maintaining a CEMS
according to the Tier 4 methodology in
98.33(a) (4)





CO2 Emissions from Anode Baking of Prebake Cells

i - Pitch Volatiles Consumption:

~

Initial weight of green anodes
(metric tons)

~

Annual baked anode production
(metric tons)

~

Annual hydrogen content in
green anodes (metric tons)

~

Annual waste tar collected (metric tons)

CO2 Emissions from Anode Baking of Prebake Cells

1 - Bake Furnace Packing Material:

~

Annual packing coke consumption
(metric tons/metric ton baked anode)

~

Sulfur content in packing coke
(percent weight)

~

Annual baked anode production
(metric tons)

~

Ash content in packing coke
(percent weight)

Other:







|—| Smelter specific slope coefficients (or

overvoltage emission factors), if applicable

Note: Sources may use either smelter-specific values from annual measurements of parameters
needed to complete the equations in §98.63 (e.g., sulfur, ash, and hydrogen contents, and carbon in
skimmed dust from Soderberg cells) or the default values shown in Table F-2 of subpart F.

Aluminum Production Monitoring Checklist
Greenhouse Gas Reporting Program

Page 2 of 3

40 CFR 98, subpart F
February 2018

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See also the information sheet for Aluminum Production (EPA-430-F-09-029R) at:
https://www.epa.gov/ghgreporting/subpart-f-information-sheet.

This document is provided solely for informational purposes. It does not provide legal advice, have
legally binding effect, or expressly or implicitly create, expand, or limit any legal rights, obligations,
responsibilities, expectations, or bene fits in regard to any person. This information is intended to assist
reporting facilities/owners in understanding key provisions of the Greenhouse Gas Reporting Program.

Aluminum Production Monitoring Checklist
Greenhouse Gas Reporting Program

Page 3 of 3

40 CFR 98, subpart F
February 2018

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