The Air Quality Analyzer is an atmospheric device similar to the Air Analyzer, but it includes a quality classification to the base atmosphere to determine if the air is breathable for humans or not.

In the device inspector, the Air Quality Analyzer shows the atmosphere analysis (Pressure, Temperature, Volume, Mols, and Composition of the surrounding atmosphere) but also a classification if the air is breathable or not:

• Low or Too Low Temperature / High or Too High Temperature
• Low or Too Low Pressure / High or Too High Pressure
  
• Void (no atmosphere in the surrounding area)
• Bad composition / Critical composition (too much CO2 or O2, not enough O2, presence of toxic gases, etc.)

The sensor comes along with a status light which visually shows the result for the colonist in the room.

• Green: OK, the atmosphere is breathable
• Red: bad composition or toxic atmosphere
• Yellow: too hot or over-pressurized atmosphere
• White: low pressure
• Violet: Vacuum (no pressure)
• Blue: Too cold temperature

When the light is continuous, it means that even with the alert, the astronaut can continue to breathe in the room, but a solution must be found at soon as possible.

When the light is blinking, the air quality is bad, the problem corresponding to the color will be affecting the colonist's health and they need to equip a space suit to not die.

The Air Quality Analyzer will define the air quality for the whole area. Every cell of a room will be considered breathable if the air quality analysis result is good. The area considered by the device is limited by airtight objects, like walls and airlocks. So you can separate 2 different atmospheres using an airlock, between a living area, and a greenhouse, for example.

If two or more Air Quality Analyzers are placed in the same area, the nearest is considered by the colonists.

To define the best % of O2, temperature, and pressure ranges, the following diagram can be considered.

Some of the main values are also provided in the following table, where the best range is defined in green.