Travellers who pass through the five major U.S. airports that still allow indoor smoking in designated public rooms face a hidden health hazard, the U.S. Centers for Disease Control and Prevention said.
A study by the federal health agency found that second-hand smoke levels directly outside public smoking areas were five times higher than the levels in smoke-free airports.
The airports are: Hartsfield- Jackson Atlanta International, Washington Dulles International, McCarran International in Las Vegas, Denver International and Salt Lake City International. They account for 15 per cent of U.S. air travel, the agency said.
