So oxygen does exist on Mars since its atmosphere is made up of 0.13% oxygen.

Is that good news for us?

This created a question for me after reading other answers. Is it enough for bacteria or small things to live? We know that there is frozen water there. Is it possible that maybe something happened to mars a long time ago?

The question is where did the oxygen come from. Oxygen likes to combine with things like silicon to make silicon dioxide or iron to make iron oxide which is why Mars is red but the typical abiotic atmosphere is CO2, some ammonia, and maybe methane. We get our nitrogen from the ammonia that used to be in our atmosphere and our oxygen from the CO2 that used to be in our atmosphere but it took life to make those changes. Did Mars had life in the past to get it's oxygen?

You must have oxygen levels between 19% to 20% just to support life. I would also be concerned what other gases may be present that may pose a immenant hazard. That is why we use a multi-gas meter to check the LEL (lower explosive limit) to see if there are ignitables, combustibles and flammables in the environment you are in.

With that being said, if we had the technology you can build a cheap machine and be able to extract the oxygen for purposes to use in a self contained pod of some sort. It is a bit more complex then you would think. On earth in order to extract oxygen from the air to liquify it you need to first make nitrogen. Nitrogen (LIN) is used in the process of making liquid oxygen (LOX). I know this because I'm in the business of producing liquid cryogenics.

Depends what you want to do with the oxygen, or if you consider esoteric data to be good news.

Mars' atmosphere also contains 1.6% Argon. That's good news if you like Argon.

Cheers!

Yep 0.13% Oxygen with a dose of 95% CO2 and 1.6% Argon, neither which are useful to you.

So unless you like your Oxygen with Argon and CO2, Mars' oxygen isn't sufficient for you.

There is oxygen on Mars, but there is so little oxygen, so we wouldn't be able to breath it, It would be like being on the top of Mount Everest, but worst.

That's not enough oxygen for humans to breathe, so it really doesn't matter much.

No. That is no news for us.