Emissions Factors Data Selector

This data selector search allows you to find UK data. Please note that these emissions factors are specifically for the UK only (not including overseas territories and crown dependencies).

Select your data using the fields below. When you choose some of the values, the options in the other fields will automatically update to show only the selections where data is available. This ensures you can always make valid choices and find exactly what you need. However, this is not the case for all values; the following will not have any effect: Start Year, End Year, Pollutant, Source, Fuel Type.

Factors are available back to 1990 for greenhouse gases, 1980 for ammonia and 1970 for all other pollutants.

Please note the following information when selecting criteria for searching emission factors:

• You can select more than one source by holding down the Shift or Ctrl keys during selection
• A user friendly transport emission factor data sheet is available in the Emission factors for transport section of this website
• If some emission factors are missing in this database it is either because the methodology used in the NAEI is not based on the product of emission factors and activity values or the data are confidential