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📈 Live CO₂ · Mauna Loa Observatory
423.7
parts per million (ppm)
↑ +3.1 ppm vs last year
Updated monthly · Source: NOAA
1958
CO₂ measurements began
+50%
CO₂ rise since pre-industrial
30+
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Climate science
What is the Mauna Loa Observatory?
Located high on the slopes of a Hawaiian volcano, the Mauna Loa Observatory has been measuring atmospheric CO₂ since 1958. Its remote location and stable air make it the gold standard for tracking global greenhouse gas levels.
Nov 2024 · 3 min read
Experts
Who is Xiye Bastida?
The Mexican-Indigenous activist leading Fridays for Future NYC and championing indigenous voices in climate.
Nov 2024 · 4 min
At home
What’s wrong with indoor gas cookers?
36 million UK homes cook with gas. Here’s what the science says about the health risks.
Sep 2024 · 3 min
CO₂ concentration rising year on year
Atmospheric CO₂ measured at Mauna Loa Observatory, 1960–2024 (ppm)
CO₂ levels: 316 ppm (1960), 326 (1970), 338 (1980), 354 (1990), 369 (2000), 390 (2010), 412 (2020), 424 (2024).
CO₂ concentration (ppm) · Source: NOAA / Mauna Loa Observatory
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What percentage of our time do we spend indoors on average?
A
Around 50%
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