It was a Tuesday in early February 2015 when Sylvie Gravel walked into her colleague Paul Makar’s office carrying printouts that would mystify both of them.
The two scientists at Environment and Climate Change Canada were staring at computer model forecasts of ozone gas. Up in the Earth’s atmosphere, the ozone layer helps block harmful ultraviolet radiation. But closer to the surface, the reactive gas has been linked to health problems and smog, so the federal government department monitors it in air quality forecasts.
 

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