# $PPM · Carbon dioxide in the air at Mauna Loa

The monthly mean of carbon dioxide in the air at Mauna Loa Observatory, Hawaii, in parts per million, as NOAA's Global Monitoring Laboratory publishes it: built from daily means and centred on the month. From December 2022 to July 4 2023, after the Mauna Loa eruption, the readings come from Maunakea, 21 miles north; NOAA fills a month with too few days by interpolation and the number is printed as NOAA gives it. Counted from January 2010.

| Field | Value |
| --- | --- |
| Newest complete period | Sep 2026: 426.07 ppm, score 6, Quiet |
| Source | NOAA Global Monitoring Laboratory, Mauna Loa CO2 monthly mean (co2_mm_mlo.csv) (https://gml.noaa.gov/ccgg/trends/data.html) |
| Terms | US government work, made freely available to the public; NOAA asks that it be credited. |
| Cadence | Monthly. NOAA posts a month in the first weeks of the next; the month prints when it is in the file. |
| Grade | reference |
| Rulebook | Rulebook v0.2, 2026-10-04 |

## Settlement

Why this grade: The longest running record of carbon dioxide in the air, from a US government laboratory. NOAA can revise the newest months by a few hundredths; the record keeps the revision.
What it costs to move: Not possible from outside the laboratory.
When the source is late: A month prints when NOAA's file has it and stays open until then. If the file's newest month is more than 45 days past its end, the read fails. A month NOAA never posts is void.
Precision: Parts per million to two decimals, as NOAA prints it.

## As first published, and the proof

Not on-chain yet. The newest complete period goes on-chain with the daily proof at 12:40 UTC.

## Last 30 complete periods

| Period | Level | Change | Band |
| --- | ---: | ---: | --- |
| Sep 2026 | 426.07 ppm |  | Quiet |
| Aug 2026 | 427.55 ppm |  | Quiet |
| Jul 2026 | 429.13 ppm |  | Normal |
| Jun 2026 | 431.43 ppm |  | Normal |
| May 2026 | 432.34 ppm |  | Normal |
| Apr 2026 | 431.12 ppm |  | Normal |
| Mar 2026 | 430.15 ppm |  | Normal |
| Feb 2026 | 429.35 ppm |  | Normal |
| Jan 2026 | 428.62 ppm |  | Quiet |
| Dec 2025 | 427.49 ppm |  | Quiet |
| Nov 2025 | 426.46 ppm |  | Quiet |
| Oct 2025 | 424.87 ppm |  | Quiet |
| Sep 2025 | 424.37 ppm |  | Quiet |
| Aug 2025 | 425.48 ppm |  | Normal |
| Jul 2025 | 427.87 ppm |  | Normal |
| Jun 2025 | 429.61 ppm |  | Normal |
| May 2025 | 430.51 ppm |  | Normal |
| Apr 2025 | 429.64 ppm |  | Normal |
| Mar 2025 | 428.15 ppm |  | Normal |
| Feb 2025 | 427.09 ppm |  | Normal |
| Jan 2025 | 426.65 ppm |  | Normal |
| Dec 2024 | 425.40 ppm |  | Normal |
| Nov 2024 | 423.85 ppm |  | Quiet |
| Oct 2024 | 422.38 ppm |  | Quiet |
| Sep 2024 | 422.03 ppm |  | Quiet |
| Aug 2024 | 422.99 ppm |  | Normal |
| Jul 2024 | 425.55 ppm |  | Normal |
| Jun 2024 | 426.91 ppm |  | Normal |
| May 2024 | 426.90 ppm |  | Normal |
| Apr 2024 | 426.51 ppm |  | Normal |

JSON: https://tickerz.com/api/indices/ppm

## Asked often

**What is the CO2 level at Mauna Loa this month?** The air at Mauna Loa held 426.07 parts per million of carbon dioxide on average in Sep 2026, as NOAA's Global Monitoring Laboratory measures it.

**Where does the $PPM number come from?** Tickerz reads it from NOAA Global Monitoring Laboratory, Mauna Loa CO2 monthly mean (co2_mm_mlo.csv). Monthly. NOAA posts a month in the first weeks of the next; the month prints when it is in the file. Each number is kept as it was first published, with a timestamped proof, and any later revision is shown beside it.

**Can I download the $PPM data?** Yes, free and with no key: the full history as JSON at https://tickerz.com/api/indices/ppm and every period as CSV at https://tickerz.com/api/indices/ppm/history.csv.

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