High oxygen level on Cambria - yellow atmosphere outline

Normal oxygen level on paradise Venus - blue atmosphere outline

Low oxygen level on almost unterraformed Mercury - red atmosphere outline

For human life to survive you need 18-24% of the air to be breathable O2 (Earth's atmosphere has about 21% or 210,000 parts-per-million). Any less and you'll suffocate, any more and you'll get oxygen toxicity. From orbit, too little oxygen will make the atmosphere look red, too much will be yellow, and blue will be just right.

Terraforming[edit | edit source]

Oxygen requires a minimum amount of atmospheric pressure before it can begin to accumulate.

Habitability for plants and microbes to grow on a planets surface requires a ratio of 100,000 to 320,000 ppm. Habitability for animals and humans outside of a Hab building is a narrower range between 180,000 and 240,000 ppm. The oxygen range in which a world is habitable for humans is really quite narrow. You will need to pay more attention to oxygen than to the other stats when trying to keep a world habitable.

If your world's oxygen falls below 180,000 ppm, the atmosphere will look red. If it goes over 240,000 ppm, the atmosphere will look yellow. If your oxygen levels are between those points, the atmosphere will look blue.

You can't have more than 1,000,000 ppm oxygen on your world, because that's 100% of the atmosphere.

Certain biosphere genes & species can also influence your oxygen levels.

The highest oxygen percentage record of the random planets is SUFUGOL, (999,161 ppm).


Governors[edit | edit source]

The governors Lola Faradova, Justus Black and Rex Jansson have effects that can help your facilities reduce your world's oxygen levels faster.

The governors Rafael Francisco Nogueira, John Neherua and Rebecca Freyja O'Rourke have effects that can help your facilities increase your world's oxygen levels faster.

Buildings[edit | edit source]

Building Effects
O2 Filter -Oxygen
Carbon Fixer -Oxygen, +Pressure
Hydro Generator -Oxygen, -Water
Oxygen Plant +Oxygen
CyanoVats +Oxygen, -Pressure
Kelp Farm +Oxygen, -Pressure, +Biomass/Oxygen
Solar Shade -Temperature, -Biomass/Oxygen, -Credits
Orbital Mirror +Temperature, -Water, -Biomass/Oxygen
Biofixture Lab -Pressure, +Biomass/Oxygen
AtmoGen Suite +Pressure, +Oxygen
Pocket Mine +Pressure, +Oxygen
Electrolysis Plant -Water, +Oxygen
Comet Sling +Water, -Biomass/Oxygen
Hab Complex +Habitats, +Oxygen
Hab Dome +Habitats, +Water, +Biomass/Oxygen
Transit Network +Population, -Biomass/Oxygen

Note: If the player is playing with the Biosphere function, then whenever a building is supposed to produce biomass, it now produces oxygen instead.

Temperature Cooling Plant · Aerostat Platform · Solar Shade · Heating Cluster · Borehole · Orbital Mirror
Pressure Sequestration Plant · Biofixture Lab · Hydrogen Processor · Thermal Dust · AtmoGen Suite · Pocket Mine
Oxygen O2 Filter · Carbon Fixer · Hydro Generator · Oxygen Plant · CyanoVats · Kelp Farm
Water GeoCistern · Electrolysis Plant · Ice Launcher · Cloud Seeder · Aquifer Network · Comet Sling
Biomass Algae Colony · Kelp Forest · Coral Reef · Soil Farm · Grass Farm · Forest Stand
Biosphere Tidal Enclave · Deep-Sea Collective · Reef Institute · Automated Nursery · Ecosimulator · Zoological Society
Population Hab Unit · Hab Complex · Hab Dome · Children's Creche · Transit Network · Spaceport
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