U.S. Customs and Border Protection suspended operations for several hours on Wednesday, July 29, 2026, at Montréal-Trudeau International Airport after a strong odour associated with varnish from nearby construction materials was detected. The disruption temporarily halted processing of U.S.-bound passengers.
Approximately 20 flights departing for the United States were cancelled due to the suspension. Passengers were warned to expect delays as U.S. Customs gradually resumed operations. Montréal-Trudeau Airport advised travelers to verify their flight status with their airline prior to arriving at the airport to mitigate disruption.
Official Response and Health Safety
Airport representatives stated that ventilation was increased in the affected areas following the
odour incident. The Montreal Fire Department inspected the site and confirmed the odour did not pose a health risk. Efforts to restore full U.S. Customs operations were ongoing, with officials thanking passengers for their patience during the delay.
Context of Airport Redevelopment
Montréal-Trudeau International Airport is undergoing a $10 billion redevelopment project involving extensive construction work. The odour originated from varnish used in painting applications linked to this major infrastructure transformation, projected to continue over the next decade as the airport expands and upgrades its facilities.
