About 1.9 million American adults either develop asthma or experience worsening of symptoms in the workplace. “Work-related asthma is associated with increased disability, mortality, and adverse social and economic outcomes,” explained the lead author of the report, Jacek Mazurek, who is also the lead research epidemiologist at the division of respiratory disease studies from the U.S. National Institute for Occupational Safety and Health, in a press release.