light colors:
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green: safe, airlock was activated just because someone pressed the airlock button randomly or atmos/engi finished they job already and nobody opened the door yet.
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blue: still safe, but is a warning at beyond that door there may be minor temperature and/or air issues (sleep gas on the hall or minor n2/o2 issues).
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yellow: not safe, the room beyond the door is either cold enough for kill people, lacks enough oxy and/or n2 for support life (or haves “average” dangerous gases like high concentrations of water vapor, tritium and/or freezon) or is straight up spaced.
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red: death inside, the room is heated up enough for kill if not turn into ash whoever even opens the door and/or the room haves plasma inside at may combust into plasma fire at any moment, at this point the airlocks may need to be id locked so only engis can open it.
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dark green: safe? Weh gas inside, you no need to know more.