Real-time and historical CO2 levels

Atmospheric CO2 Levels Graph

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.

Real-time and historical CO2 data combined.

Data Sources


800,000 years ago - 1000 years ago

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.

Credits: Bernhard Bereiter, Sarah Eggleston, Jochen Schmitt, Christoph Nehrbass-Ahles, Thomas F. Stocker, Hubertus Fischer, Sepp Kipfstuhl and Jerome Chappellaz. 2015.

Learn about temperature data sources.


1000 years ago - 1958

Historical CO2 record from the Law Dome DE08, DE08-2, and DSS ice cores

Credits: D.M. Etheridge, L.P. Steele, R.L. Langenfelds, R.J. Francey and the Division of Atmospheric Research, CSIRO, Aspendale, Victoria, Australia

Learn about temperature data sources.

1958 - Present Day

Atmospheric CO2 concentrations (ppm) derived from in situ air measurements at Mauna Loa, Observatory, Hawaii.

Credits: Dr. Pieter Tans (NOAA/ESRL), Dr. Ralph Keeling, S. J. Walker, S. C. Piper and A. F. Bollenbacher (Scripps Institution of Oceanography)

Learn about temperature data sources.

You may enjoy this software for free under a Creative Commons (CC) Attribution-NonCommercial licence.
Getting the Data Right.

Our Team of Scientific Advisors

Dr. Pieter Tans
NOAA's Earth System Research Laboratory

Dr. Jeremy Shakun
Boston College

Dr. Geoff Dutton
NOAA's Earth System Research Laboratory

Dr. Ed Dlugokencky
NOAA's Earth System Research Laboratory

A graph for researchers and educators

Key features

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.

You may enjoy this software for free under a Creative Commons (CC) Attribution-NonCommercial licence.
Watch this educational video.

Climate data in the ice core record

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Contact us

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.

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