More than two dozen countries, such as Jamaica, the Dominican Republic and Mexico, require airlines to spray insecticides on flights that arrive from Canada. "There is no such thing as a non-toxic pesticide," said researcher Chris van Netten, a professor emeritus with the University of British Columbia's school of population and public health. She now brings a mask with her when flying to destinations she knows require spraying. However, passengers won't see that link if they book through third party websites like Khunaysir did when she booked her Air Canada flight. Twenty-seven countries require Canadian airlines to spray.

Source: CBC News April 15, 2019 00:00 UTC