Ozone is the high gas layer that shields the planet from burning rays. The ozone layer, a hole in the ozone, ozone depletion.
High up it protects and at ground level it is a pollutant that damages lungs — the same molecule, judged by where it is. The hole over Antarctica is slowly closing after the Montreal Protocol banned the chemicals that caused it, the most successful environmental treaty there is.
1nounozoneA gas that forms a protective layer high in the atmosphere.
“Some old sprays released gases that damaged the ozone above the South Pole.”
ozone is a gas.
Also accepted in games: ozone layer
German Ozon was coined in 1840 from Greek ozein, to smell, for the gas's sharp odour.
Ancient Greek
ὄζον
German
Ozon
English, today
ozone
Built from
From German Ozon, coined 1840 by Christian Friedrich Schönbein, from Ancient Greek ὄζον, neuter participle of ὄζω (“I smell”), in reference to its pungent odour. The “fresh air” sense is from an erroneous former belief that seaweed contains and releases ozone.
Etymology from Wiktionary, CC BY-SA