Rare ozone hole opens over Arctic -- and it's big

Cold temperatures and a strong polar vortex allowed chemicals to gnaw away at the protective ozone layer in the north. Cold temperatures and a strong polar vortex allowed chemicals to gnaw away at the protective ozone layer in the north.
Author(s): Alexandra Witze Author Affiliations: Rare ozone hole opens over Arctic -- and it's big A vast ozone hole -- probably the biggest on record in the north -- has [...]