A history of the planet's O2 levels since 1991

Atmospheric Oxygen Levels Graph

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

Key features

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.

Data Sources

Getting the Data Right.

Our Team of Scientific Advisors

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

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