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Generating Import Emission Factors from Exiobase

To generate import emission factors from exiobase, run the script generate_import_factors.py

An import factor is created for an environmental flow (e.g., Carbon dioxide) in units of that flow per USD (e.g., kg/USD).

For each year, the following files are generated:

  • US_detail_import_factors_exio_{year}.csv: Single set of import factors for the US by detail sector.
  • US_summary_import_factors_exio_{year}.csv: Single set of import factors for the US by summary sector.
  • Regional_detail_import_factors_exio_{year}.csv: Import factors for each of seven regions, by detail sector,
  • Regional_summary_import_factors_exio_{year}.csv: Import factors for each of seven regions, by summary sector,
  • import_shares_{year}.csv: Provides the contribution to sector imports by country
  • multiplier_df_exio_{year}.csv: Full dataframe with emission factors and contributions by region and sector.

File names are appended with the BEA schema year, e.g., _17sch.

The field in the _import_factors files are defined as

Field Description Example
Sector USEEIO sector code 325111
Year Year of data 2021
Unit Numerator unit for Import factor kg
ReferenceCurrency Denominator unit for Import factor USD
PriceType Price type of ReferenceCurrency Basic
Flowable Name of substance Carbon dioxide
Context Environmental compartment to or from air
FlowUUID ID from FEDEFL b6f010fb-a764-3063-af2d-bcb8309a97b7
FlowAmount Import factor value 0.57
BaseIOLevel BEA IO table basis Detail

The environmental flows fields are the same as those used for USEEIO which are from the Federal LCA Commons Elementary Flow List.

BEA API Access

To make calls to BEA for service imports data (by BEA service category, country, and year), users must first register at https://apps.bea.gov/api/signup/. After doing so, users will be provided with an API key to the provided email. Store this as 'BEA_API_key.yaml' in the API subfolder of the import_factors_exio directory.

Package requirements