Earth’s ozone layer blocks most harmful UV-B sunlight
High in the stratosphere, a thin veil of ozone molecules absorbs the bulk of the Sun’s UV-B rays — the wavelengths that burn skin and damage DNA most efficiently.
Without that filter, life on land would face a harsher radiation budget. The famous “ozone hole” over Antarctica showed how fragile the shield can be when chemistry goes wrong.
Protecting ozone is planetary healthcare. Sunscreen helps you; international limits on ozone-eating chemicals help everyone under the same blue sky.
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