Well, the air in China is mostly not safe to breathe in, since the air is full of PM 2.5 particles which are unhealthy for your body. To make things worse, only 3 cities out of 73 passed air quality standards, which means wherever you go you will most likely see smog in the sky.
NO
Yes
China airline from Taiwan is not safe, please do not compare air china to china airline , they are complete different airline.
It is ceartainly safe to breathe, assuming that the rest is normal air.
by filtering the air
It may not be safe because of the harmful chemicals that are in it and also because of how much it is holding or consumes.
Nothing much. Exhaled air has about 4% less oxygen in it compared to regular air, but it's still perfectly safe, if a bit smelly, to breathe.
It depends on what area you are in. Like if you are in China, there are many people there is a lot of factories there.
They breathe air with lungs.
They do breathe air.
Betta fish breathe air....yes... that's right... they breathe air. They breathe air because they have an organ by their gills that is called the Labyrinth's Organ which allows them to breathe air. They breathe air by coming up to the surface of the water. Then they gather air in their mouths and hold their breath underwater.
Yes, cheetahs do breathe air.
The air you breathe out is denser.