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Fabric

Minecraft Version(s) (Optional)

1.20.1

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So, I had an idea as a kind of challenge with thin air that I've been looking to achieve. Basically I am looking to set thin air to make the world air thin at like Y=90 and below, making lands near sea level have a lower air quality, making it so you'd have to seek higher elevations for safety. The ideas I had for this kind of challenge listed in the title I was wondering if they're feasible. The ideas listed below I was thinking could create an interesting challenge if a special layer of thin air is set and has the ideas below.

Visual fog layer is a visual representation of low quality air, but the fog is very thin so if you look at a creeper hole in the ground that dips just below the Y level, you wouldn't really see it since it's a few layers thick, but if you looked down into a valley or a cave, you'd see over several layers the fog obscuring everything up to a certain point. Think of those images you see in mountainous regions irl where in the morning you see the valleys are obscured with fog and tree tops can be seen poking through.

The time of day idea would be a mechanic that makes it so the air quality would rise and fall between certain Y levels depending on the day. So lets say you have a base up in the trees, and you'd need to wait for day to arrive for the bad air below you to clear up before you can go down and collect some resources, and you'd have to return to higher ground when night approaches.

The time limit for thin air idea would introduce a grace period at the start of the world of a certain number of days before the air quality at the set layers will start to go bad, and you'll have to seek higher ground.

I know these ideas are mainly for this kind of challenge, but some of them if implemented could be for normal use as well like the thin visual fog.