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 "entity": {
  "type": "project",
  "id": "oslo-optical-waste-sorting",
  "title": "Optical Waste Sorting by Bag Colour (Haraldrud & Klemetsrud)",
  "canonicalUrl": "https://1001smartcities.org/projects/oslo-optical-waste-sorting/"
 },
 "currentRevisionId": "2026-08-22-evidence-baseline",
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   "id": "2026-08-22-evidence-baseline",
   "createdAt": "2026-08-22T21:02:00Z",
   "effectiveAt": "2026-08-04",
   "changeType": "baseline",
   "summary": "Created the first structured Evidence Passport with 14 claims and 8 source dossiers.",
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     "operation": "add",
     "path": "/evidencePassport",
     "summary": "Added claim-level evidence mapping and source dossiers."
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    {
     "operation": "add",
     "path": "/revisionHistory",
     "summary": "Established a permanent, hash-addressed baseline revision."
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    "asOf": "2026-08-04",
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    "projectState": {
     "status": "live",
     "outcome": "ongoing",
     "evidenceGrade": "official",
     "timeline": {
      "started": 2009,
      "ended": null
     }
    },
    "governance": {
     "operator": "City of Oslo — Renovasjons- og gjenvinningsetaten (REG), using Envac's Optibag optical-sorting technology",
     "actorTypes": [
      "city-government",
      "private"
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    },
    "claims": [
     {
      "id": "clm-8baef75205427b6a",
      "field": "snippet",
      "text": "Since 2009, Oslo residents have sorted food waste into green bags and plastic packaging into purple bags",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-0b9354e350e19301",
       "src-979c40e042782d14"
      ],
      "supportNote": "The waste-industry report states that Oslo had used the coloured plastic-waste bag since 2009 — 'Oslo har benyttet posen siden 2009' — and the city's current sorting page states the present colours: 'I Oslo kildesorterer vi matavfall i grønne poser, plastemballasje i lilla poser, og restavfall i vanlige handleposer' (in Oslo we sort food waste into green bags, plastic packaging into purple bags, and residual waste into ordinary carrier bags).",
      "caveat": "The 2009 date refers to the plastic bag Oslo introduced then, which was blue; the purple bag arrived only in late 2021, so no resident sorted into a purple bag in 2009. The engineering press separately reported that it was 2012 before every Oslo household sorted its waste, so the scheme reached the whole city later than the start date suggests.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
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     {
      "id": "clm-52df51d5dd8fb809",
      "field": "snippet",
      "text": "(blue before 2021)",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-0b9354e350e19301",
       "src-af1351ea936583f1"
      ],
      "supportNote": "The trade report of 15 November 2021 announces the change and describes the outgoing bag as blue: 'De blå såkalte Optibag-posene har lenge vært en kilde til bekymring' (the blue so-called Optibag bags have long been a source of concern). The union magazine, writing in 2016, describes the system then in force: 'I Oslo er det blå poser for plast, grønne for matavfall og vanlige poser for restavfall.'",
      "caveat": "The switch was announced in November 2021 and reached the shops over the following weeks, so blue and purple bags circulated side by side for a time. The city's own Haraldrud plant page still describes plastic packaging as arriving in 'blå/lilla poser' — blue or purple.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-c2d24ae9e5f55b40",
      "field": "snippet",
      "text": "tossing all bag types into one bin picked up by ordinary trucks",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-979c40e042782d14"
      ],
      "supportNote": "The city's sorting page states that all three bags go into the same bin outside the home — 'De tre posene legger du i samme dunk utenfor boligen' — and that after collection they are driven to one of Oslo's sorting plants at Haraldrud or Klemetsrud: 'Etter innsamling blir de kjørt til et av Oslos sorteringsanlegg på Haraldrud og Klemetsrud.'",
      "caveat": "The page confirms the single bin and the single collection round, but it says nothing about the collection vehicles. That the bags are picked up by ordinary refuse trucks rather than by a dedicated fleet is not stated by any listed source.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-23943c59521a2665",
      "field": "snippet",
      "text": "Optical scanners at Haraldrud and Klemetsrud then sort the bags by colour",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-dd49ca430fff08d6",
       "src-bc51e1721db38613"
      ],
      "supportNote": "Both municipal plant pages state that the bags are separated from one another by colour in the optical sorting plants. Haraldrud: 'Posene sorteres fra hverandre etter farge i de optiske sorteringsanleggene.' Klemetsrud: 'Posene sorteres fra hverandre etter farge i det optiske sorteringsanlegget.' Both pages describe the plants as receiving household waste sorted into three fractions.",
      "caveat": "Neither plant page gives the year its line opened, and no listed source dates Haraldrud to 2009 or Klemetsrud to 2012. The union magazine says Oslo got its optical sorting plant in 2010, and the engineering press says only that by 2012 every Oslo household was sorting its waste.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-b6cc4bd4e6b001f7",
      "field": "snippet",
      "text": "food goes to biogas, plastic to recycling, residual waste to district heating",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      ],
      "supportNote": "The city page traces all three streams. Food waste: 'Det blir sendt til Oslos biogassanlegg på Nes på Romerike', where it becomes biogas and bio-fertiliser. Plastic: 'De lilla posene blir sendt til gjenvinningsanlegg i Europa (det meste til Sverige, og noe til Tyskland)', where it is granulated and sold as feedstock for new plastic. Residual waste: 'Restavfallet går til energigjenvinning her i Oslo. Det betyr at vi brenner avfallet og bruker varmen til å produsere fjernvarme.'",
      "caveat": "Norway has no plant of its own for recycling plastic, so the purple bags are exported; the city page names Sweden and Germany as the destinations and does not report how much of the exported plastic actually becomes new material.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-2c809ca4341544b0",
      "field": "snippet",
      "text": "Combined capacity: 150,000 tonnes a year.",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      ],
      "supportNote": "The union magazine reports the figure as a combined one: 'Anleggene er fordelt på tre linjer, to på Haraldrud og en på Klemetsrud. De kan til sammen sortere 150 000 tonn husholdningsavfall i året' — the plants are spread over three lines, two at Haraldrud and one at Klemetsrud, and together they can sort 150,000 tonnes of household waste a year.",
      "caveat": "This is a stated capacity from October 2016, not a measured throughput, and the source counts three sorting lines where the entry names two plants. The engineering press reported in 2014 that 132,000 tonnes of Oslo's waste was actually being sorted optically.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-ba131b7a1a81cfa0",
      "field": "impact",
      "text": "Oslo's own climate agency reports",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-cb903bc90cb82a4a"
      ],
      "supportNote": "The page is published by Klimaetaten, the City of Oslo's climate agency, and relays the waste agency's own audit: '2023 var sist gang Renovasjon- og gjenvinningsetaten (REG) i Oslo gikk gjennom avfallet til oslofolk. Da ble et fast utvalg avfallsposer åpnet og alt avfall analysert' — in 2023 REG last went through residents' waste, opening a fixed sample of bags and analysing everything in them.",
      "caveat": "The climate agency is passing on the waste agency REG's picking analysis rather than reporting measurements of its own. Both are arms of the City of Oslo, which also runs the sorting plants, so this is the operator reporting on itself.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     },
     {
      "id": "clm-a674fe70276255eb",
      "field": "impact",
      "text": "in the most recent published data (2023, released March 2025)",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-cb903bc90cb82a4a"
      ],
      "supportNote": "The page carries the publication line '3 March, 2025' and states that 2023 was the last time REG went through residents' waste. It closes by looking forward to the next analysis — 'Vi krysser fingrene for at vi har blitt enda flinkere til neste avfallsanalyse!' — confirming that the 2023 study was the newest at the time of writing.",
      "caveat": "The page establishes that 2023 was the most recent analysis as of March 2025. Whether a newer analysis has appeared since is not covered by any listed source.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-52eda76682b4e046",
      "field": "impact",
      "text": "only about a third of the 16.3 kg of plastic packaging each resident threw away that year",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "The page states it twice, in words and as a rate: 'Ifølge avfallsanalysen er kun en tredjedel av plastemballasjen sortert i riktig pose. Altså den lilla. Sorteringsgraden i lilla pose er på 33 prosent' — according to the waste analysis only a third of plastic packaging is sorted into the right bag, namely the purple one; the sorting rate for the purple bag is 33 per cent.",
      "caveat": "The share is measured on the plastic packaging thrown away, not on the number of residents who sort it correctly, and it comes from a sample of opened bags rather than from total collected tonnages.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-91704c60eb618436",
      "field": "impact",
      "text": "roughly half of all food waste still ends up in ordinary residual-waste bags",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "The page names the half outright: 'For eksempel havner halvparten av matavfallet i restavfallsposen, noe som betyr at vi går glipp av verdifullt matavfall som kan omgjøres til biodrivstoff for kjøretøy og økologisk sertifisert gjødsel' — half the food waste ends up in the residual-waste bag, so valuable material that could become vehicle biofuel and certified organic fertiliser is lost. It adds that an average residual bag is more than 60 per cent waste that belonged elsewhere.",
      "caveat": "The figure is stated as a round half, with no tonnage or percentage behind it, and it rests on the same 2023 sample of opened bags rather than on total collected volumes.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-94829eed9fa540e7",
      "field": "lesson",
      "text": "a 2021 national bag-colour standard",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "The trade report states that a national labelling system for source separation had been introduced in which plastic waste is colour-coded purple, and that Oslo's new bag followed it: 'Siden den gang er det innført et nasjonalt merkesystem for kildesortering, der plastavfall er fargekodet lilla. Det blir også løsningen for Oslos nye plastavfallspose.' The report is dated 15 November 2021 and describes Oslo's switch as starting that week.",
      "caveat": "The report dates Oslo's own switch to November 2021 but does not say in which year the national colour standard was set; it describes the standard as already in place by then, so 2021 is the year Oslo followed it rather than a documented year for the standard itself.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-b64b76d812f7f076",
      "field": "lesson",
      "text": "repeated information campaigns still leave most residents putting plastic in the wrong bag",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "The climate-agency page reports the shortfall — 'Det betyr at to tredeler plastemballasje ikke blir sortert ut. Dette havner i restavfallet, faktisk over ti kilo plast per innbygger' (two thirds of plastic packaging is not sorted out and ends up in residual waste, more than ten kilos per resident) — and says that according to REG source separation in Oslo has stood still in recent years. The union magazine describes the city's chosen instrument as persuasion: 'Kommunen er mest opptatt av å gi folk informasjon og motivasjon, og å hjelpe til med tilrettelegging på kjøkkenet', with home visits and, as a last resort, a fee for households that do not sort.",
      "caveat": "The sources measure the share of plastic that ends up in the wrong bag, not the share of residents who put it there, and neither counts the information campaigns or tests whether they changed behaviour.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
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      "field": "lesson",
      "text": "this is a distinct system from the Klemetsrud waste-to-energy plant next door",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "The city keeps a separate page for the sorting plant, 'Klemetsrud utsorteringsanlegg', which receives source-separated household waste and separates the bags by colour; its listed contact is the waste and recycling agency REG. The sorting page names a different operator for the energy plant: 'Renovasjons- og gjenvinningsetaten driver Haraldrudanlegget, mens Hafslund driver Klemetsrudanlegget. Det er Hafslund som driver fjernvarmeproduksjonen' — REG runs the Haraldrud plant while Hafslund runs the Klemetsrud one and the district-heating production.",
      "caveat": "The engineering press describes the optical line as sited at the incineration plant itself — 'Det optiske sorteringsanlegget på forbrenningsanlegget til Oslo kommune' — so the two are co-located on one site rather than neighbouring addresses. What separates them is the process and the operator, not the distance.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-802ed9fb43a4956a",
      "field": "lesson",
      "text": "one recovers materials from bags, the other burns what's left",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      "supportNote": "The city page describes exactly this division: 'Der blir de grønne og lilla posene skilt vekk basert på posefargene, og sendt videre til materialgjenvinning. Restavfallet går gjennom anleggene og til forbrenning' — the green and purple bags are separated out on the basis of bag colour and sent on to material recovery, while the residual waste passes through the plants and goes to incineration.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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      "id": "src-dd49ca430fff08d6",
      "title": "City of Oslo — Haraldrud sorting facility (Renovasjons- og gjenvinningsetaten)",
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       "value": "Official municipal page: current bag fractions, colours, and that bags are separated by colour in the optical sorting plants.",
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      "title": "City of Oslo — how to sort waste at source (Hvordan kildesortere i Oslo)",
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       "value": "Official page for the second (2012) optical sorting line, distinct from the Klemetsrud waste-to-energy/CCS plant.",
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      "title": "Fagforbundet (Norwegian trade-union magazine) — 'Søppelsortering – et klimavennlig dugnadsprosjekt'",
      "url": "https://www.fagforbundet.no/a/284745/for-tillitsvalgte/nyheter-for-tillitsvalgte/soppelsortering---et-klimavennlig-dugnadsprosjekt/",
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      "title": "Teknisk Ukeblad (TU.no) — 'Verdens største optiske sorteringsanlegg'",
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