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Donald Redelmeier, a Sunnybrook Research Institute doctor, revealed in a recent press release that adults who sustain concussions have a three times greater chance for suicide if the injury is sustained on a weekday up to four times more if it occurs over the weekend. One explanation for this could be that people suffer more injuries doing physical activities over the weekend than they do during the week.

Suicide may be linked to air pollution, according to new research that finds spikes in completed suicides in the days following peak pollution levels.The research took place in Utah, part of the United States' western "suicide belt." Suicide is the 10th-leading cause of death in the United States; in Utah, it is the eighth. Though the notion that suicide and air quality could be linked may not seem intuitive, similar studies in South Korea, Taiwan and Canada have also linked the two.