“A massive Arctic ozone hole opened up over the Northern Hemisphere for the first time this year, an international research team reported Sunday.The hole covered two million square kilometres — about twice the size of Ontario — and allowed high levels of harmful ultraviolet radiation to hit large swaths of northern Canada, Europe and Russia this spring, the 29 scientists say.The discovery of the “unprecedented” hole comes as the Canadian government is moving to cut its ozone monitoring network.”

Link: ‘Unprecedented’ ozone hole opens over Canadian Arctic