349.37 ppm CO₂

Born when atmospheric CO₂ at Mauna Loa was 349.37 ppm.

Most recent measurement: 432.34 ppm (May 2026) — about 83 ppm higher than when I was born.

Source: NOAA Global Monitoring Laboratory, Mauna Loa monthly mean CO₂. Pre-1974 measurements by C. David Keeling, Scripps Institution of Oceanography. Data fetched and embedded at build time.

Further reading: NOAA — CO₂ trends, NASA — Carbon Dioxide, Wikipedia — CO₂ in the atmosphere.