You are feeling numbness and tickling in your extremities - Silent death

[Macciow]

So, basically as the post says, I don't know if it's a mix of things, I'm blacking out of sleepiness and then I collapse and just die, any solution?
Don't know if pressure is the problem have 55kPa N2 and 15kPa O2 in my tug

[Macciow]

Ps. The O2 Alarm is blasting, opened doors and let all the gasses go out of my ship in space and then redocked, made it so that the pressure levels got to 13kPa n2 and 3kPa O2 and it's still blaring and the pump isn't pumping anymore O2, any solutions?

[DNGR_Z0N3_]

Safe level of O2 is 20kPa. Put on your EVA suit. Check the O2 level in the tank, then check the the pump (off/auto/on? Is the pump powered? Is the pump connected to the O2 sensor?), then check the integrity of the envelope you are in (does the room hold pressure?)

[Kitkat Chunky]

I had the same issue, basically I think your oxygen supplies are low.

I had like 17kPa o2 and 50 odd N2, when I returned to the refuel kiosk I had to basically fill the whole bar with 02

it's annoying, because the game gives you no easy estimate of time of o2 on your ship (afaik)

[Tumskunde]

Lack of O2 is a killer yes.
Ship wise, O2 alarm and a pump with O2 tank hooked up set to auto should suffice, make sure there's no holes to vacuum and you should be good, just click on the screws around the edge of the control panel to link devices. Same setup with N2 should work as well.
OKLG and just leave all doors open (I stand in the airlock), it will eventually equalise gas/pressures with the station.
CO2 issues might be rearing their head too as they build up over time, you can dock with OKLG to vent into their atmosphere, but CO2 alarm and a pump with a CO2 tank and scrubber if you can afford/find one will fix that.

Other than that, you can light an Oxygen Candle to provide more O2 in a confined area, or put a spare suit O2 canister down and bash(break) it to do similar.

I usually just suit up at OKLG and leave my suit on while I'm off station, then I don't worry about atmospheric stuff until I'm ready to setup a more final ship.