In this false-color image, the blue and purple show the hole in Earth's protective ozone layer over Antarctica on Oct. 5. Earth's ozone layer is slowly but noticeably healing. NASA via AP hide caption toggle caption NASA via AP Environment The ozone layer is on track to recover in the coming decades, the United Nations says January 10, 2023 • The ozone layer is a thin shield in the stratosphere that protects humans and the environment from harmful levels of the sun's ultraviolet radiation.
