{
  "url": "https://gml.noaa.gov/webdata/ccgg/trends/co2/co2_mm_mlo.txt",
  "retrieved_utc": "2026-09-08T17:17:40.045480+00:00",
  "sha256": "206d97b06c0b0750e398bee06ef247f897d8fa2912b743af4bc78c0fe64a660b",
  "bytes": 59538,
  "all_months": 821,
  "subset_1990_2021": 384,
  "quality_negative_rows": 0,
  "last_row": [
    2026.0,
    7.0,
    2026.5417,
    429.12,
    428.83,
    21.0,
    0.59,
    0.25
  ],
  "source_creation": "2026-08-05",
  "analysis_years": [
    1990,
    2021
  ],
  "unit": "ppm dry-air mole fraction",
  "scale": "WMO CO2 X2019 for NOAA data since 1974; verified change log March 2021",
  "attribution": "Data provided by NOAA Global Monitoring Laboratory, Carbon Cycle and Greenhouse Gases group, Boulder, Colorado, USA. Full source includes Scripps data before May 1974; analysis subset uses NOAA period only.",
  "terms": "https://gml.noaa.gov/about/disclaimer.html",
  "documentation": [
    "https://gml.noaa.gov/ccgg/trends/data.html",
    "https://gml.noaa.gov/ccgg/trends/mlo.html",
    "https://gml.noaa.gov/ccgg/trends/trends_log.html",
    "https://gml.noaa.gov/ccgg/about/co2_measurements.html"
  ],
  "product_level": "Calibrated background-air monthly means, adjusted to month center; not raw analyzer outputs.",
  "course_derivative": "1990-2021 rows extracted without changing values; course models are not official NOAA products."
}