For carbon dioxide: 

• Fuel combustion" refers to fossil fuel combustion and non-energy/feedstock use (IPCC category 1A);
• Fugitive" refers to flaring and venting of associated gas in oil and gas production (IPCC category 1B); 
• Industry" refers to cement production (IPCC category 2); and 
• Others" refers direct emissions from tropical forest fires plus 10% of biofuel combustion emissions, which is the fraction assumed to be produced unsustainably (IPCC category 5). 

For methane: 

• Energy" comprises production, handling, transmission and combustion of fossil fuels and biofuels (IPCC category 1A and 1B); 
• Agriculture" comprises animals, animal waste, rice production, agricultural waste burning (non-energy, on-site) and savannah burning (IPCC category 4); 
• Waste" comprises landfills, wastewater treatment, human wastewater disposal and waste incineration (non-energy) (IPCC category 6); 
• Others" include industrial process emissions and tropical and temperate forest fires (IPCC categories 2 and 5). 

For nitrous oxide: 

• Energy" comprises combustion of fossil fuels and biofuels (IPCC category 1A and 1B); 
• Agriculture" comprises fertiliser use (synthetic and animal manure), animal waste management, agricultural waste burning (non-energy, on-site) and savannah burning (IPCC category 4); 
• Waste" comprises human sewage discharge and waste incineration (non-energy) (IPCC category 6); "Others" include industrial process emissions, N2O usage and tropical and temperate forest fires (IPCC categories 2, 3 and 5). 

For carbon monoxide, nitrogen oxides, NMVOC and sulphur dioxide:

• Fuel combustion" refers to fossil fuel combustion and evaporation of NMVOC in road transport (part of IPCC category 1A);
• Biofuel combustion" refers to traditional biofuels as well as to wood waste, paper, ethanol, etc. (part of IPCC category 1A);
• Fugitive" comprises flaring and venting of associated gas in oil and gas production, handling / transmission losses of oil and charcoal production (IPCC category 1B); 
• Industry" refers to non-combustion industrial processes, excluding solvent use (IPCC category 2);
• Solvent use" refers to solvent use in industry and non-industry sectors (IPCC category 3);
• Agriculture" comprises agricultural waste burning (non-energy, on-site) and savannah burning (IPCC category 4); 
• Waste" comprises waste incineration (non-energy) (uncontrolled residential burning and controlled non-residential burning) and hazardous waste handling  (IPCC category 6); 
• Others" comprises tropical forest fires and temperate forest fires (IPCC category 5A). 

For HFCs:

• HCFC-22 manufacture (by-product emissions) (IPCC category 2E)
• HFC usage (refrigeration,  fire extinguishers, semiconductor manufacturing, miscellaneous use) (IPCC categories 2E and 2F) 

For PFCs:

• Primary aluminium production (by-product emissions) (IPCC category 2C)
• HFC usage in semiconductor manufacturing (IPCC category 2E)
• PFC usage (semiconductor manufacture, refrigeration, fire extinguishers, aerosols, foam blowing, accelerators (high energy physics), solvents, miscellaneous) (IPCC category 2F) 

For SF6:

• Electrical equipment Manufacture (OEM) (manufacture, on-site erection of GIS (Gas Insulated Switchgear), circuit breakers etc.) (IPCC category 2F)
• Electrical equipment use (maintenance/leakage of GIS (Gas Insulated Switchgear), circuit breakers etc.), in accelerators (high energy physics) and unknown applications through sales to utilities (IPCC category 2F)
• Magnesium industry  (primary production and die casting) (IPCC category 2C)
• Semiconductor manufacture (IPCC category 2F)
• Adiabatic property applications (use in car tires, soles of sport shoes, etc.) (IPCC category 2F)
• Miscellaneous use (soundproof windows, aluminium degassing, other use excluding Russia and China) (IPCC categories 2C and 2F)
• Miscellaneous use by Russia and China (IPCC categories 2C and 2F) 

This grouping basically follows the definition of IPCC source categories 1 to 6:

Fossil fuel (EDGAR category 'F'):

• Fossil fuel combustion (IPCC 1A)
• Fossil fuel production, handling, transmission and distribution (IPCC 1B)
• Energy transformation of fossil fuels (coke ovens, oil refineries) (IPCC 1B)
• CO2 from non-energy/feedstock use of energy carriers (IPCC 1A or 2 , 3, 6) 

Biofuel (EDGAR category 'B'):

• Combustion of fuelwood, charcoal, vegetal waste and other non-commercial biomass fuels (IPCC 1A)
• Combustion of wood/wood waste in industry and power generation (for energy purposes) (IPCC 1A)
• Production of charcoal (IPCC 1B) 

Industrial processes (EDGAR category 'I'):

• Non-combustion processes in industry (IPCC 2)
• Solvent use in all sectors (IPCC 3) 

Agriculture (EDGAR category 'L'):

• Animal breeding: enteric fermentation and animal waste handling) (IPCC 4A and 4B, respectively)
• Arable land: fertiliser use (synthetic and animal waste used as fertiliser) (IPCC 4D)
• Rice cultivation (IPCC 4C)
• Other crops (N-fixing crops, crop residues on/in soil, histosoils) (IPCC 4D)
• Agricultural waste burning (field burning) (IPCC 4F)
• Savannah burning (IPCC 4E)
• Indirect N2O sources (IPCC 4D) 

Biomass burning (EDGAR category 'L'):

• Deforestation (IPCC 5)
• Temperate vegetation fires (IPCC 5) 

Waste handling (EDGAR category 'W'):

• Landfills (IPCC 6A)
• Waste water treatment (IPCC 6B)
• Human waste water disposal (IPCC 6B)
• Waste incineration (uncontrolled residential burning, controlled non-energy burning) (IPCC 6C)
• Hazardous waste handling (IPCC 6D) 

Production and use of halocarbons and other fluorinated gases (EDGAR category 'H'):

• Production of halocarbons (CFCs, halons, HCFCs, methyl bromide, etc.) and other F-gases (IPCC 2E)
• By-product emissions from HCFC-22 manufacture (IPCC category 2E) 
• By-product emissions from primary aluminium production (IPCC category 2C)
• Use of halocarbons and other F-gases in all sectors (HFCs, PFCs, SF6)  (IPCC categories 2C and 2F) 

Other (EDGAR category 'F'):

• Fossil fuel fires
  

For a detailed definition of the corresponding IPCC categories see the following documents available on the web:

• IPCC 1997 Inventory Guidelines, Vol 1, Reporting Instructions, Ch. 1 
• IPCC 1996 Revised Guidelines for National Greenhouse Gas Inventories: Reporting Instructions
• UNFCCC Common Reporting Format Guidelines