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        0.150061888482848,
        0.0907382478388899,
        0.255316411752092,
        0.00807017440628898,
        7.8e-07
      ],
      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 1996,
      "steel": 17.992,
      "activity": [
        13.758,
        4.233,
        12.83,
        12.83,
        12.83,
        12.83,
        6593.4
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      "PM2.5": [
        0.084947649316163,
        0.23910034077824,
        0.120049510786278,
        0.0567114048993062,
        0.0765949235256275,
        0.00282456104220114,
        7.8e-07
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      "PM10": [
        0.0970830277899006,
        0.273257532317989,
        0.150061888482848,
        0.0907382478388899,
        0.255316411752092,
        0.00807017440628898,
        7.8e-07
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 1997,
      "steel": 18.501,
      "activity": [
        13.988,
        4.513,
        13.054,
        13.054,
        13.054,
        13.054,
        5691.708
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      "PM2.5": [
        0.084947649316163,
        0.23910034077824,
        0.120049510786278,
        0.0567114048993062,
        0.0765949235256275,
        0.00282456104220114,
        7.8e-07
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      "PM10": [
        0.0970830277899006,
        0.273257532317989,
        0.150061888482848,
        0.0907382478388899,
        0.255316411752092,
        0.00807017440628898,
        7.8e-07
      ],
      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 1998,
      "steel": 17.315,
      "activity": [
        13.426,
        3.889,
        12.746,
        12.746,
        12.746,
        12.746,
        5253.336
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      "PM2.5": [
        0.084947649316163,
        0.23910034077824,
        0.120049510786278,
        0.0567114048993062,
        0.0765949235256275,
        0.00282456104220114,
        7.8e-07
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      "PM10": [
        0.0970830277899006,
        0.273257532317989,
        0.150061888482848,
        0.0907382478388899,
        0.255316411752092,
        0.00807017440628898,
        7.8e-07
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 1999,
      "steel": 16.298,
      "activity": [
        12.633,
        3.662,
        12.139,
        12.139,
        12.139,
        12.139,
        6140.772
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      "PM2.5": [
        0.089031295732288,
        0.127175024099646,
        0.120049510786278,
        0.0567114048993062,
        0.0765949235256275,
        0.00236343660672057,
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      "PM10": [
        0.101750052265472,
        0.14534288468531,
        0.150061888482848,
        0.0907382478388899,
        0.255316411752092,
        0.00675267601920164,
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes",
      "productionReconciliation": {
        "differenceMt": -0.0030000000000001137,
        "note": "Official process tonnages and crude steel total differ; reported values are retained separately, without rescaling or inventing a balancing activity."
      }
    },
    {
      "year": 2000,
      "steel": 15.155,
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        11.551,
        3.604,
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        10.89,
        10.89,
        10.89,
        5673.888
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      "PM2.5": [
        0.0944197218444982,
        0.12230076858773,
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        0.0765949235256275,
        0.00278292695468188,
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      "PM10": [
        0.107908253536569,
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        0.150061888482848,
        0.0907382478388899,
        0.255316411752092,
        0.00795121987051967,
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 2001,
      "steel": 13.543,
      "activity": [
        10.271,
        3.272,
        9.87,
        9.87,
        9.87,
        9.87,
        3439.26
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      "PM2.5": [
        0.0647466604354091,
        0.0969538586760973,
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        0.0567114048993062,
        0.0811517263738045,
        0.00229256666396499,
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      "PM10": [
        0.0739961833547533,
        0.11080440991554,
        0.150061888482848,
        0.0907382478388899,
        0.270505754579348,
        0.00655019046847139,
        7.8e-07
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 2002,
      "steel": 11.667,
      "activity": [
        8.956,
        2.711,
        8.561,
        8.561,
        8.561,
        8.561,
        2309.1156
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      "PM2.5": [
        0.0441906362357355,
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        0.0567114048993062,
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      "PM10": [
        0.050503584269412,
        0.102589581243915,
        0.150061888482848,
        0.0907382478388899,
        0.295084075914735,
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 2003,
      "steel": 13.268,
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        10.63,
        2.638,
        10.228,
        10.228,
        10.228,
        10.228,
        4982.472
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      "PM2.5": [
        0.0844575524949199,
        0.0891577090993605,
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        0.0567114048993062,
        0.0743401967456326,
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      "PM10": [
        0.0965229171370512,
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        0.0907382478388899,
        0.247800655818775,
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 2004,
      "steel": 13.766,
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        10.667,
        3.099,
        10.18,
        10.18,
        10.18,
        10.18,
        5549.148
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      "PM2.5": [
        0.067496039260537,
        0.0885436672585055,
        0.120049510786278,
        0.0549489383279707,
        0.0786867853353766,
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      "PM10": [
        0.0771383305834708,
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        0.0879183013247531,
        0.262289284451255,
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 2005,
      "steel": 13.239,
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        10.55,
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        10.189,
        10.189,
        10.189,
        7178.9652
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        0.0660208347156791,
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      "PM10": [
        0.0754523825322047,
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        0.262052449748744,
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes",
      "productionReconciliation": {
        "differenceMt": -0.002000000000000668,
        "note": "Official process tonnages and crude steel total differ; reported values are retained separately, without rescaling or inventing a balancing activity."
      }
    },
    {
      "year": 2006,
      "steel": 13.871,
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        11.203,
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        10.696,
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        0.0841562449788442,
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      "PM10": [
        0.0961785656901076,
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes",
      "productionReconciliation": {
        "differenceMt": -0.002000000000000668,
        "note": "Official process tonnages and crude steel total differ; reported values are retained separately, without rescaling or inventing a balancing activity."
      }
    },
    {
      "year": 2007,
      "steel": 14.317,
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        11.282,
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        0.11014643531873,
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      "PM10": [
        0.125881640364263,
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 2008,
      "steel": 13.521,
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        10.478,
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        10.137,
        10.137,
        8310.57084
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      "PM10": [
        0.125537826332158,
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 2009,
      "steel": 10.079,
      "activity": [
        7.959,
        2.119,
        7.671,
        7.671,
        7.671,
        7.671,
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      "PM2.5": [
        0.0789864864864865,
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      "PM10": [
        0.0902702702702703,
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 2010,
      "steel": 9.709,
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        7.323,
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        0.0642940944959814,
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      "PM10": [
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes",
      "productionReconciliation": {
        "differenceMt": 0.009000000000000341,
        "note": "Official process tonnages and crude steel total differ; reported values are retained separately, without rescaling or inventing a balancing activity."
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    },
    {
      "year": 2011,
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        6.946,
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      "PM10": [
        0.0597986830983322,
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 2012,
      "steel": 9.579,
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        7.525,
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      "PM10": [
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 2013,
      "steel": 11.858,
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      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 2014,
      "steel": 12.033,
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        10.079,
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    },
    {
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    },
    {
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    },
    {
      "year": 2017,
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    },
    {
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    },
    {
      "year": 2019,
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    },
    {
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    },
    {
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        7.8e-07
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      "PM10": [
        0.0535678622485663,
        0.119516042551548,
        0.23966700265719,
        0.0335524382840669,
        0.257964206205649,
        0.005666077320377,
        7.8e-07
      ],
      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 2022,
      "steel": 5.963,
      "activity": [
        4.824,
        1.138,
        4.779,
        4.779,
        4.779,
        4.779,
        2390.69556
      ],
      "PM2.5": [
        0.0440600706125961,
        0.107592319794876,
        0.221253240173369,
        0.0303247995333097,
        0.0890484161191781,
        0.00198312706213195,
        7.8e-07
      ],
      "PM10": [
        0.0503543664143956,
        0.122962651194144,
        0.276566550216711,
        0.0485196792532955,
        0.296828053730594,
        0.005666077320377,
        7.8e-07
      ],
      "precision": "Direct official yearbook tonnages, reported to nearest 1000 tonnes"
    },
    {
      "year": 2023,
      "steel": 5.6,
      "activity": [
        4.457599999999999,
        1.1423999999999999,
        4.5,
        4.5,
        4.5,
        4.5,
        2235.59028
      ],
      "PM2.5": [
        0.0470314305665325,
        0.10495672374799,
        0.193720970950309,
        0.0359610312204328,
        0.0809713968957872,
        0.00198312706213195,
        7.8e-07
      ],
      "PM10": [
        0.0537502063617514,
        0.119950541426275,
        0.242151213687886,
        0.0575376499526924,
        0.269904656319291,
        0.005666077320377,
        7.8e-07
      ],
      "precision": "Reconstructed from rounded World Steel Association totals and process shares; not exact process tonnage"
    },
    {
      "year": 2024,
      "steel": 4.0,
      "activity": [
        2.8680000000000003,
        1.1320000000000001,
        3.0,
        3.0,
        3.0,
        3.0,
        1376.48808
      ],
      "PM2.5": [
        0.0480995845810333,
        0.0877422199476781,
        0.179863102455976,
        0.0234778315268505,
        0.0865450039940219,
        0.00198312706213195,
        7.8e-07
      ],
      "PM10": [
        0.0549709538068952,
        0.100276822797346,
        0.22482887806997,
        0.0375645304429608,
        0.28848334664674,
        0.00566607732037699,
        7.8e-07
      ],
      "precision": "Reconstructed from rounded World Steel Association totals and process shares; not exact process tonnage"
    }
  ],
  "pending": [
    {
      "year": 2025,
      "missing": [
        "flaring",
        "PM2.5:0",
        "PM2.5:1",
        "PM2.5:2",
        "PM2.5:3",
        "PM2.5:4",
        "PM2.5:5",
        "PM2.5:6",
        "PM10:0",
        "PM10:1",
        "PM10:2",
        "PM10:3",
        "PM10:4",
        "PM10:5",
        "PM10:6"
      ]
    }
  ],
  "latestFactorYear": 2024,
  "latestProductionEdition": 2026,
  "adapterLimitations": [
    {
      "edition": 2007,
      "url": "https://worldsteel.org/wp-content/uploads/2007-World-Steel-in-Figures.pdf",
      "reason": "Country tonnage header order not extractable; process total retained, without inferring years from publication year"
    }
  ],
  "historicalGap": "National reconstruction covers 1981-2024: paper workbook snapshot 1981-1989, retained verified official snapshot 1990-2024. Factory-map history is now a sourced, non-exhaustive 1981-2024 reconstruction; see plant-map-sources.json for intervals, approximate locations, exclusions and named gaps.",
  "productionPolicy": "Direct reported tonnages take priority over products of rounded totals and shares. Newer verified same-year editions resolve ties. SSY2025 is subscription-only; no purchase performed.",
  "historicalWorkbookSegment": {
    "years": [
      1981,
      1989
    ],
    "document": "User-supplied Figures.xlsx, paper calculation snapshot",
    "sha256": "45f03543159eb3020dfba07859f1ef5573bdd8ac7d34206f15a5fe6c9cf4eb5f",
    "inputCells": {
      "crudeSteel": "Fig.7!B5:B13",
      "routeProduction": "Fig.7!D5:E13",
      "pigIron": "Fig.7!C5:C13",
      "flaringTJNet": "Fig.7!G5:G13",
      "PM10Factors": "Fig.7!J5:P13",
      "PM25Factors": "Fig.8!J5:P13"
    },
    "verification": "Recomputed activity - factor for all seven groups; matches cached Fig.7/8 source emissions and total, and all seven Fig.10 route quantities within 1e-9.",
    "provenance": "Paper workbook snapshot, not newly fetched official web data. WSA production and NAEI factors/flaring are the upstream sources cited by the paper. Original workbook is not distributed.",
    "join": "1981-1989 workbook snapshot followed by unchanged official 1990-2024; source-version discontinuity is possible. Cross-period LMDI describes these joined inputs, not a harmonized inventory revision."
  },
  "overlap1990": {
    "year": 1990,
    "decision": "Retain current verified official row unchanged. Workbook 1990 is comparison only, never appended.",
    "paper": {
      "steel": 17.8,
      "activity": [
        13.169,
        4.672,
        12.319,
        12.319,
        12.319,
        12.319,
        6482.916
      ],
      "PM10": [
        0.0970830277899006,
        0.273257532317989,
        0.150061888482848,
        0.0907382478388899,
        0.255316411752092,
        0.00807017440628898,
        7.8e-07
      ],
      "PM2.5": [
        0.084947649,
        0.239100341,
        0.120049511,
        0.056711405,
        0.076594924,
        0.002824561,
        7.8e-07
      ]
    },
    "retainedOfficial": {
      "steel": 17.841,
      "activity": [
        13.169,
        4.672,
        12.319,
        12.319,
        12.319,
        12.319,
        6482.916
      ],
      "PM10": [
        0.0970830277899006,
        0.273257532317989,
        0.150061888482848,
        0.0907382478388899,
        0.255316411752092,
        0.00807017440628898,
        7.8e-07
      ],
      "PM2.5": [
        0.084947649316163,
        0.23910034077824,
        0.120049510786278,
        0.0567114048993062,
        0.0765949235256275,
        0.00282456104220114,
        7.8e-07
      ]
    },
    "PM10": {
      "paperReconstructedKt": 8.771278492667431,
      "retainedOfficialReconstructedKt": 8.771278492667431,
      "officialMinusPaperKt": 0.0,
      "paperNationalIntensityKgPerT": 0.4927684546442377,
      "officialNationalIntensityKgPerT": 0.4916360345646225
    },
    "PM2.5": {
      "paperReconstructedKt": 5.396695417232,
      "retainedOfficialReconstructedKt": 5.3966954111622805,
      "officialMinusPaperKt": -6.069719837853427e-09,
      "paperNationalIntensityKgPerT": 0.3031851357995506,
      "officialNationalIntensityKgPerT": 0.30248839253193655
    },
    "productionDifferenceMt": {
      "steel": 0.04100000000000037,
      "BOF": 0.0,
      "EAF": 0.0,
      "pigIron": 0.0
    }
  },
  "official1990OnwardSHA256": "c8210a0b6eeedd43d800bb9a7e090d5a02c14631a8ad2dba691e1cf705d76706"
}