In Nunavut's westernmost region, more than 40 per cent of all babies born in 2009 were later admitted to hospital with lung infections. In the area around western Hudson Bay, the figure was 24 per cent.
And in Nunavik, or Arctic Quebec, nearly half of all newborns were hospitalized.
Over all, lung infections for newborns just months old were 40 times southern rates, Ms. Banerji said.
Just as alarming was the severity of the infection. The research paper documents cases of babies less than six months old spending weeks in intensive care and suffering permanent lung damage.
Some needed CPR. Some needed last-ditch interventions. Some died.
"These are just horribly, horribly sick kids," Ms. Banerji said.
In the worst-afflicted areas, up to one in every 30 children born ends up in intensive care and struggling to breathe.
The reasons are familiar: overcrowded homes, high exposure to cigarette smoke, poor nutrition.
The lung infections are often complicated by other infections such as influenza.