Ozone layer exist above the earth about ______?

Ozone layer exist above the earth about ______?

اوزون کی تہہ زمین کے اوپر ______ تقریباً موجود ہے؟
Explanation

The ozone layer exists about 30 km above the Earth's surface.

It is located in the stratosphere.

It plays a crucial role in blocking harmful ultraviolet radiation from the Sun.