Atmospheric CO₂ Levels Reach New High in April 2026

In April 2026, atmospheric carbon dioxide levels at NOAA's Mauna Loa Observatory averaged 431.12 parts per million (ppm), marking a new record high since measurements began in 1958. This represents an increase from under 320 ppm recorded at the start of the observations.

Climate scientist Zachary Labe of Climate Central commented on the new record, stating, "It's just another sign that carbon dioxide continues to increase in our atmosphere as our planet continues to warm." He added, "For many climate scientists, this is just 'here it is again, another record in the wrong direction.'"

Labe explained that atmospheric CO₂ levels typically peak in April each year due to the release of greenhouse gases from decaying plants after winter. Some of this CO₂ is reabsorbed by plants during the growing season in warmer months. However, NOAA's data indicate a concerning trend, with the average monthly CO₂ levels steadily increasing over time.

Although atmospheric CO₂ levels have continued to rise, the United States experienced a reduction in emissions in 2023 and 2024. This trend reversed in 2025, partially due to increased electricity demand from artificial intelligence data centers. Despite this, Labe noted reasons for optimism as the adoption of renewable energy sources, such as solar and wind, continues to expand.