It is useful because we can breathe it.
Ozone is useful. The oxygen forms again transforms to form ozone.
It is harmful at ozone layer. It is because this leads to depletion of ozone.
The oxygen formed in upper atmosphere is not for breathing. It forms again into ozone by natural phenomenons.
lion are useful and harmful
It is not harmful. Also it is not useful
Oxygen is a vital gas necessary for human and animal survival. It is used by cells in the body to produce energy. However, excessive exposure to pure oxygen can be harmful and toxic, leading to lung damage or even fire hazards in certain conditions.
The changes talking place in our surroundings and which are useful to us are called Useful changes. The changes which are not useful but harmful are called Harmful changes
useful
i think its both harmful and useful
Ozone at ground level is harmful. It is useful in stratosphere as it protects us from harmful UV rays.
useful for dieing (;
It is USeful