Home > Research Information > CAPSS > Emission Source Classification
The CAPSS emission source classification was based on SNAP 97 nomenclature of EMEP/CORINAIR
methodology, developed by the European Environment Agency (EEA). To make the classification
adapted in accordance with domestic reality, the fugitive dust category has been included in data
since 2007, bringing the the total number of first‑level source categories to 12. The biomass
burning category has been included in data since 2011, with the total number being 13.
However, the fugitive dust and biomass burning categories have been included in the national air pollutant
emissions inventory (NEI) since 2015. Locally developed emission factors were primarily
applied to estimate emissions, and then other emission factors, including SNAP 97 (EEA)
and AP‑42 (US EPA), were applied to estimate emissions in CAPSS.
Emission sources of fuel combustion consist of three categories, including energy production (01), non‑industry (02), manufacturing industry (03), and emissions from manufacturing processes are included in the industrial process category (04). Evaporation of gasoline at gas stations and oil storage tanks is under the energy transport and storage category (05) and emissions from painting processes are included in the solvent use category (06). Cars belong to the road transport category (07), while aircraft, ships, construction machinery belong to the non‑road transport category (08). Emissions from the waste disposal category (09) and the agriculture category (10) are also estimated in CAPSS. Fires are considered the other surface‑pollutant source category (11), and dust produced by paved roads and construction sites is classified as the fugitive dust category (12). Lastly, grilled meat and fish and charcoal kilns belong to the biomass burning category (13). The fugitive dust (12) and biomass burning (13) categories have been included in the national air pollutant emissions inventory (NEI) since 2015.