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U.S. customs operations gradually resume at Montreal airport after odour disruption

About 20 U.S.-bound flights were canceled after customs halted operations, and the airport increased ventilation while inspectors found no health risk.

  • U.S. Customs and Border Protection temporarily halted preclearance processing at Montréal-Trudeau International Airport after strong fumes from varnish used in interior painting work spread through the area.
  • The morning disruption led to widespread travel delays and forced the cancellation of roughly 20 flights bound for the United States.
  • Border officers began returning to work around midday after local firefighters inspected the space and confirmed the fumes presented no safety or health hazards.
  • Although processing has resumed, airport officials advise travelers heading to the U.S. to confirm their flight status and expect ongoing backlogs as operations stabilize.
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The Toronto StarThe Toronto Star
+20 Reposted by 20 other sources
Lean Left

U.S. customs operations gradually resume at Montreal airport after odour disruption

MONTREAL - U.S. customs operations at Montreal-Trudeau International Airport gradually resumed on Wednesday after they were temporarily suspended earlier in the day, leading to the cancellation of about 20 flights

·Toronto, Canada
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Lean Left

The U.S. Customs temporarily suspended its operations at Montréal-Trudeau Airport due to a "smell of building materials," announced Montreal Airports (MDA) on Wednesday. Many flights to the U.S. are therefore cancelled.

·Montreal, Canada
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  • 60% of the sources lean Left
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Radio-Canada broke the news in Montreal, Canada on Wednesday, July 29, 2026.
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