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The most important factor of a planet's atmosphere is simply having one. Specifically, having air pressure similar to Earth's 100,000 pascals (Pa) at sea level. From orbit, your planet's atmospheric pressure will affect the visibility of the air above the surface: too thin and it will be invisible, too thick and it will be opaque.

Terraforming[]

A minimum amount of Pressure is necessary to build a supply of Oxygen (1 Pa) and water (600 Pa).

Changing Pressure also affects accumulation of Temperature. "Atmosphere Thinning" causes loss of heat, while "Atmosphere Thickening" causes increase of heat. Increasing Pressure will create the status of Temperature that is "Retained by Atmosphere". That is the greenhouse effect. The Temperature increases by 0.046 mK for every pascal.
The state of Water is affected by Pressure. At less than 600 Pa, all water is held as vapor or ice even though the temperature is not at the full ice or vapor point. When 600 Pa is breached (and the temperature is within the liquid range (between 200,500 and 399,500 mK)), a percentage of the vapor/ice will turn into liquid water instantly, which can destroy every outpost and city that happens to be below the sealevel.

Habitability for plants and microbes to grow on a planets surface requires an atmospheric pressure of 10,000 to 190,000 Pa. Habitability for animals and humans outside of a Habitation building is a narrower range between the 50,000 and 150,000 Pa.

Pressure affects the look of your world
Pressure (Pa) Effect on world
>0 Clouds start forming, but cannot be seen
until Pressure is higher.
>42,000 The atmosphere outline can be seen.
>110,000 Clouds start to turn opaque and expand.
150,000 The atmosphere outline is at it's thickest
- Above that point, it fades.
>190,000 The atmosphere outline cannot be seen.
>200,000 The surface is hidden by the clouds.

Governors[]

Frank M. Srikar, Ayzia Aoyama and Nubia Matiba have effects that can help your facilities reduce your world's pressure levels faster.

Elle De León, Yusuf Mardin and David Munoz have effects that can help your facilities increase your world's pressure levels faster.

Buildings[]

Building Effects
Decreasing
Sequestration Plant -Pressure
Biofixture Lab -Pressure, +Biomass (Biomass only), +Oxygen (Biospheres only)
Hydrogen Processor -Pressure, +Temperature, +Water
Increasing
Thermal Dust +Pressure
AtmoGen Suite +Pressure, +Oxygen
Pocket Mine +Pressure, +Oxygen, +Credits
Secondary
Borehole +Temperature, +Pressure
Carbon Fixer -Oxygen, +Pressure
CyanoVats +Oxygen, -Pressure
Kelp Farm +Oxygen, -Pressure
Ice Launcher -Water, -Pressure
Aquifer Network +Water, +Pressure
Spaceport +Population, +Pressure, +Credits
Buildings
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 Oxygen 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 Habitation Unit · Habitation Complex · Habitation Dome · Children's Creche · Transit Network · Spaceport
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