{"id":"https://openalex.org/keywords/source-apportionment","display_name":"source apportionment","description":"Source apportionment is the estimation of the contributions of different sources to measured environmental pollutants, commonly using chemical composition and statistical methods.","display_name_alternatives":["apportionment of pollution sources","contaminant source apportionment","pollutant source apportionment","pollution source apportionment"],"ids":{"openalex":"https://openalex.org/keywords/source-apportionment","wikidata":null},"primary_topic":{"id":"https://openalex.org/T10075","display_name":"Atmospheric chemistry and aerosols","score":0.3804,"subfield":{"id":"https://openalex.org/subfields/1902","display_name":"Atmospheric Science"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10075","display_name":"Atmospheric chemistry and aerosols","score":0.3804,"subfield":{"id":"https://openalex.org/subfields/1902","display_name":"Atmospheric Science"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10139","display_name":"Heavy metals in environment","score":0.1731,"subfield":{"id":"https://openalex.org/subfields/2310","display_name":"Pollution"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10122","display_name":"Toxic Organic Pollutants Impact","score":0.1613,"subfield":{"id":"https://openalex.org/subfields/2307","display_name":"Health, Toxicology and Mutagenesis"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"works_count":34803,"cited_by_count":844768,"works_api_url":"https://api.openalex.org/works?filter=keywords.id:keywords/source-apportionment","updated_date":"2026-10-22T04:07:25","created_date":"2026-09-30T00:00:00"}
