This graph displays earth's atmospheric oxygen levels from 1991 up to the present. 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.
An atmospheric oxygen graph for researchers and educators
Real-time and Historical data
Atmospheric O2 levels are updated automatically when new data becomes available. Air samples are collected at a network of stations around the world and processed at the renowned Scripps Institution of Oceanography at La Jolla, California. Learn more about the data sources.
Free Oxygen 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 O2 measurement data is updated automatically as soon as the data becomes available.
Zoomable and Printable
View atmospheric oxygen levels over it's entire measurement span or zoom in 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 oxygen graph is responsive and can automatically resize to fit whatever device or screen size it is being viewed on.
An inventory of Earth's oxygen levels.
Scripps O2 Program
Changes in atmospheric oxygen levels are measured at the Scripps Institution of Oceanography at La Jolla, California under the Scripps O2 Program. Since 1991, air samples have been collected on a consistent basis from stations around the world to provide a global and hemispheric perspective on oxygen variability. The Scripps O2 Program is under the direction of Professor Ralph Keeling.
The Scripps Institute report oxygen measurements as changes in the O2/N2 ratio of air relative to a reference. They compute:
where (O2/N2)sample is the O2/N2 mole ratio of an air sample and (O2/N2)reference is the O2/N2 mole ratio of their reference. Their reference is based on tanks of air pumped in the mid 1980s which are stored at the Scripps Institute laboratory in La Jolla, California.
Dr. Pieter Tans NOAA's Earth System Research Laboratory
Dr. James Hansen Columbia University
Dr. Geoff Dutton NOAA's Earth System Research Laboratory
Dr. Jeremy Shakun Boston College
Stay in touch to receive data product offerings and climate campaigns
Sign-up to the 2° Institute Newsletter.
donate, volunteer, help.
Making climate data accessible and user-friendly like this atmospheric oxygen 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.