Average carbon dioxide (CO₂) levels in the atmosphere worldwide from 1959 to 2024 (in parts per million) ×Zoomable Statistic: Select the range in the chart you want to zoom in on. Concentration in parts per million1959196119631965196719691971197319751977197919811983198519871989199119931995199719992001200320...
The oft-quoted desired limit of global temperature increase of 1.5 degrees Centigrade (~3 degrees F) is directly linked to a PPM (part per million) level of greenhouse gases in the atmosphere. There are different estimates of that critical PPM level but many use 450 PPM as the estimate link...
Parts per million (ppm) is a unit typically used to express the concentration of a substance in a solution or mixture. However, ppm can also be used to…
aOxides of carbon, sulfur, and nitrogen are important constituents of the atmosphere and are pollutants at higher levels. Of these, carbon dioxide, CO2, is the most abundant. It is a natural atmospheric constituent, and it is required for plant growth. However, as discussed in Chapter 15, ...
analyzers: GPR-1200MS series GPR-12MS series GPR-1200 series GPR-12 series GPR-1100 series GPR-11 series GPR-1000 GPR-2000 series GPR-20 series GPR-3000 series GPR-30 series GPR-3500MO GPR-35MO Intended Use: Analyze oxygen concentration in a gas mixture in a non-explosive atmosphere. Ma...
Rafi Letzter
CO2 levels over the last 400 million years. The last time CO2 levels were as high as today’s was about 3 million years ago. FOSTER ET AL/DESCENT INTO THE ICEHOUSE Thelast timethe planet had a concentration of 300 to 400 ppm of CO2 in the atmosphere was during the mid-Pliocene, 3 ...