Ozone depletion describes two related events observed since the late 1970s: a steady lowering of about four percent in the total amount of ozone in Earth's atmosphere (the ozone layer), and a much larger springtime decrease in stratospheric ozone around Earth's polar regions.
Penipisan ozon menggambarkan dua fenomena berbeda namun saling terkait yang diamati sejak akhir 1970-an: penurunan jumlah total ozon di stratosfer Bumi (lapisan ozon) sekitar empat persen, serta penurunan ozon stratosferik yang jauh lebih besar di sekitar daerah kutub bumi pada musim semi.