To knock out everyone, all I have to do is lower it some more ... to half sea-level pressure, say.

At nearly sea-level pressure I was in no danger from hypoxia; the trick was to avoid too much oxygen.

If we were at sea-level pressure, you'd be sweltering by now.

Following a drop in sea-level pressure over the next day, a depression formed in this area.

"We are passing through a phase of excess oxygen, of higher sea-level pressure," Nebogipfel said.

I do not expect that the unit of atmosphere has to be redefined, after all, sea-level atmospheric pressure is just an agreed upon reference value.

D9) What causes each hurricane to have a different maximum wind speed for that given minimum sea-level pressure?

The air pressure in an aircraft, in flight, is about 50% of sea-level pressure.

But he was still in an airlock at sea-level pressure.

For humans, the latter was more than made up by the sea-level pressure, twice their standard.