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In many cases, facilities engage in multiple processes that generate greenhouse gas emissions. In those cases, a facility would be included in all industry groups to which it belongs. For example, a refinery who also produced hydrogen would be included in both the "refineries" industry grouping and also under "Chemicals - Hydrogen Production". For an explanation as to how emissions from this facility are aggregated to totals for each industry grouping see the Data Caveats for Certain Sources and Processes Calculating GHG Totals by Industry section.
You will also notice that there are several industry subclasses listed in our data set that do not match any of the 32 specific GHG emissions processes listed in the regulationdirect emissions source categories finalized by EPA. All of these facilities which appear in groupings such as "Metals - Other Metals" only reported greenhouse gas emissions associated with the combustion of fossil fuels in 2010 and 2011. Some of these facilities such as "Other Petroleum and Natural Gas Systems" reported emissions from other processes for the first time in 2011. EPA decided to classify these facilities into industry groups based on their North American Industry Classification System (NAICS) code. All facilities were required to report this code to EPA. The table below shows which NAICS codes were mapped to each of these industry groupings. Note that in the table numbers shown as "X" can be any number.
You will also notice that there are several industry subclasses listed in our data set that do not match any of the 43 specific GHG emissions processes listed in the regulation. All of these facilities which appear in groupings such as "Other - Food Processing" and "Metals - Other Metals" only reported greenhouse gas emissions associated with the combustion of fossil fuels in 2010 and 2011. EPA decided to classify these facilities into industry groups based on their North American Industry Classification System (NAICS) code. All facilities were required to report this code to EPA. The table below shows which NAICS codes were mapped to each of these industry groupings.
Note that in the table numbers shown as "X" can be any number.
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