The CO2 residence time is far shorter than the time it takes for the particulate matter to filter back out of the atmosphere.
CO2, in the concentrations we enjoy in OUR atmosphere, does nothing but feed the plants.
You know, the foundation of all life on this planet.
Really? Then why do we have 424 ppm of CO2 in the atmosphere at present when we had only 280 ppm at the start of the industrial revolution? The particulate matter from Krakatoa has all filter out, but the CO2 we have been putting into the atmosphere is still there. And you are supposed to be a PhD Geologist? LOL
"The current atmospheric CO2 level is approximately 424 ppm.
As of early March 2026, the daily average atmospheric CO2 concentration measured at the Mauna Loa Observatory in Hawaii is around 424 parts per million (ppm), continuing the long-term upward trend observed since the late 1950s. This level is significantly above the pre-industrial baseline of about 280 ppm and well above the 350 ppm considered a safe threshold for climate stability.
CO2.Earth
+2
Historical Context
Atmospheric CO2 has risen steadily due to human activities, primarily fossil fuel combustion and deforestation. The global average CO2 in 2024 reached 422.8 ppm, marking a record high with an annual increase of 3.75 ppm—the largest one-year rise on record. Seasonal fluctuations occur due to plant growth cycles, with CO2 levels typically peaking in May in the Northern Hemisphere and declining during summer as vegetation absorbs CO2.
Climate.gov
+1
Implications
Current CO2 levels are 50% higher than pre-industrial levels, contributing to global warming, ocean acidification, and climate disruptions. The continued rise in CO2 underscores the urgency of reducing emissions and enhancing carbon sequestration to mitigate climate change impacts.
Climate.gov
+1
Monitoring
CO2 levels are tracked daily at Mauna Loa and other observatories worldwide, providing a real-time signal of the planet’s carbon balance. These measurements are critical for climate research, policy-making, and public awareness.
CO2.Earth
+1
In summary, the current atmospheric CO2 concentration is around 424 ppm, reflecting ongoing human influence on the global carbon cycle and highlighting the need for sustained climate action.
CO2.Earth
Daily CO2 - co2.earth
National Oceanic and Atmospheric Administration
Trends in CO2 - NOAA Global Monitoring Laboratory"