Proposed Rule: Mandatory Reporting of Greenhouse Gases
Under the proposed Mandatory Reporting of Greenhouse Gases (GHGs) rule, owners or
operators of facilities that contain ammonia manufacturing units (as defined below) would
report emissions from ammonia manufacturing processes and all other source categories located
at the facility for which methods are defined in the rule. Owners or operators would collect
emission data; calculate GHG emissions; and follow the specified procedures for quality
assurance, missing data, recordkeeping, and reporting.
How Is This Source Category Defined?
Under the proposal, the ammonia manufacturing source category consists of process units in which
ammonia is produced either by steam reforming or gasification of a hydrocarbon feedstock.
What GHGs Would Be Reported?
The proposal calls for ammonia manufacturing facilities to report the following emissions:
•	 Carbon dioxide (CO2) process emissions from each ammonia manufacturing unit.
•	 CO2, nitrous oxide (N2O), and methane (CH4) emissions from fuel combustion at each ammonia
manufacturing unit and any other stationary fuel combustion units at the facility by following the
requirements of 40 CFR part 98, subpart C (General Stationary Fuel Combustion Sources). The
information sheet on general stationary fuel combustion sources summarizes the proposal for
calculating and reporting emissions from these units.
•	 CO2 collected and either used on site or transferred off site, following the requirements of 40
CFR part 98, subpart PP (Suppliers of Carbon Dioxide).
In addition, each facility would report GHG emissions for any other source categories for which
calculation methods are provided in other subparts of the rule.
How Would GHG Emissions Be Calculated?
Under the proposal, facilities would use one of two methods to calculate CO2 process emissions, as
•	 Ammonia manufacturing units with certain types of continuous emissions monitors (CEMS) in
place would report using the