This graph features atmospheric CO2 levels that combine measurements from as far back as 800,000 years up to the present day with an atmospheric temperature overlay option. The graph is customizable and can be resized, printed, or pasted into your website. This is a free service, but we do ask for a donation if you find this useful. This is a project of the 2 Degrees Institute, a non-profit organization.
Changes in past atmospheric carbon dioxide concentrations can
be determined by measuring the composition of air trapped in ice
cores from Antarctica. So far, the Antarctic Vostok and EPICA
Dome C ice cores have provided a composite record of atmospheric
carbon dioxide levels over the past 800,000 years.
Bernhard Bereiter, Sarah Eggleston, Jochen Schmitt, Christoph Nehrbass-Ahles, Thomas F. Stocker, Hubertus Fischer, Sepp Kipfstuhl and Jerome Chappellaz. 2015.
Dr. Pieter Tans NOAA's Earth System Research Laboratory
Dr. James Hansen Columbia University
Dr. Ed Dlugokencky NOAA's Earth System Research Laboratory
Dr. Jeremy Shakun Boston College
A graph for researchers and educators
Real-time and Historical data
CO2 levels are updated daily with data directly from NOAA's science lab on the slopes of Moana Loa volcano on the Big Island of Hawaii. Atmospheric carbon dioxide measurements have been collected here daily since 1959. Pre-1959 data comes from ice core data taken from Antarctica. Historical and current atmospheric temperature can be overlayed on the graph. Learn more about the data sources.
Free CO2 Levels Graph
This interactive graph is free to use on your website. Simply choose your color theme and then copy and paste 2 lines of code. Data and source code is hosted on our servers so you do not have to worry about using up your server's bandwidth. New CO2 measurement data is updated automatically every day and temperature data is updated monthly.
Zoomable and Printable
View atmospheric CO2 levels and/or temperature over a span of thousands of years or zoom to specific time periods. Use your fingers to pinch and zoom on a handheld device or use a mouse with a computer. Export the chart to PNG, JPG, PDF or SVG format with the click of a button or print the chart directly from the web page.
Customizable and Responsive
Choose from 4 color themes to match your website's look and feel. Customize the width and height of your graph or have it fill your entire screen. The carbon dioxide levels graph is responsive and can automatically resize to fit whatever device or screen size it is being viewed on.
Watch this educational video.
Climate data in the ice core record
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Making climate data accessible and user-friendly like this atmospheric CO2 levels graph is a campaign of the 2° Institute (2 Degrees Institute). Its mission is to develop and support strategies that empower people to make the behavioural and lifestyle changes needed to keep our planet from warming by 2° Celsius above pre-industrial levels.