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“I don’t like to be alarmist,” said Katherine Keyes, a professor of epidemiology at Columbia University. “But I think at this point, it’s pretty alarming.”

Remembering members of the Columbia University Irving Medical Center community who died last year.

Marianthi-Anna Kioumourtzoglou, a professor of environmental health sciences at Columbia University, said that while the lower-cost sensors were not perfect, they could provide valuable information.