Current atmospheric CO₂ concentration is approximately 420 parts per million (ppm), which is 0.04%, significantly higher than pre-industrial levels of roughly 280 ppm
factualpending
Evidence Quote
“the current carbon dioxide concentration in the air is about 420 parts per million PPM for short that's roughly 0.0 4%”
Created: 8/11/2026, 1:16:05 AM
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