Atmo - O2 Overhaul
By S1nderion
Community Rating
Features
• New O2 and CO2 drains add a layer of strategy to combat and traversal. • Regeneration-based adjustments means open-ended exploration without timers. • No persistent script overhead, all effects are in-engine. • Compatible with everything.
Configuration
Atmo can be configured to run under either of the following conditions: • Anytime a Spacesuit and Helmet are equipped and shown [Default]. • Only when in non-breathable atmosphere.
Mechanics
Please note that all mechanics are only active when Atmo is running.
O2 Management
As O2 depletes, O2 Recovery Rate is reduced by up to 60%. If O2 falls below 10%, Sprinting Speed is reduced by 20% and Jump Height is reduced by 60%. Using a Boost Pack will drain a small amount of O2.
Rebreather Overload
The Rebreather Overload state is entered anytime O2 Recovery Rate is too low to restore O2. A Chronomark Notification and Status Effect will warn the player when this happens.
CO2 Management
CO2 Recovery Rate is reduced by 60%. Getting hit by enemies triggers a small increase in CO2. Accumulate CO2 over time while performing strenuous activities like running, sprinting, or sneaking. Accumulate a portion of CO2 instantly when sliding or mantling. The Regulated Breathing effect from Heliox prevents CO2 Accumulation.
Heliox
Heliox is a Chem that instantly restores some Oxygen and grants Regulated Breathing for a while. It is added to the game via scripted injection and can be looted, crafted, or bought from vendors.
Installation
Atmo can be installed anytime. It will begin running whenever conditions are met.
Compatibility
Atmo is generally compatible with everything. It is however redundant with O2 Reserve systems like Real O2 or Realistic Oxygen Meter.
Release notes
Xbox
-
3Add Chronomark HUD notification when O2 Recovery Rate reaches 0%
Adjust Heliox description and effect names
Add Regulated Breathing status effect to menu -
2Increase CO2 regeneration reduction to -60%
Decrease CO2 buildup from running
Add CO2 buildup when running with weapons out
Add Heliox item and crafting recipe -
1Initial Creations release.
Playstation
-
3Add Chronomark HUD notification when O2 Recovery Rate reaches 0%
Adjust Heliox description and effect names
Add Regulated Breathing status effect to menu -
2Increase CO2 regeneration reduction to -60%
Decrease CO2 buildup from running
Add CO2 buildup when running with weapons out
Add Heliox item and crafting recipe -
1Initial Creations release.
PC
-
3Add Chronomark HUD notification when O2 Recovery Rate reaches 0%
Adjust Heliox description and effect names
Add Regulated Breathing status effect to menu -
2Increase CO2 regeneration reduction to -60%
Decrease CO2 buildup from running
Add CO2 buildup when running with weapons out
Add Heliox item and crafting recipe -
1Initial Creations release.
Additional Screenshots Available
This mod has 6 additional screenshots available on the official Bethesda.net page.
View All Screenshots on Bethesda.netYouTube Videos
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Mod Information
- Published
- Jun 24, 2026
- Last Updated
- Aug 04, 2026
- Platforms
- Playstation, PC, Xbox
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