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People with the condition typically avoid reminders of the traumatic event. “One of the problems with PTSD is, you pull inward,” said Dr. John Markowitz.

“The age at which someone starts their periods is kind of a barometer of how they're doing in general,” says Lauren Houghton, an assistant professor at epidemiology at Columbia University.

Along with exacerbating asthma, air pollution can spark new onset airway disease, says Matt Perzanowski, an associate professor of environmental health sciences at Columbia University.