As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE CREW REPORTED FUMES IN THE COCKPIT. AN EMERGENCY WAS DECLARED, THE FLIGHT RETURNED TO DEPARTURE AIRPORT AND LANDED WITHOUT FURTHER INCIDENT. THE ODOR WAS ATTRIBUTED TO INGESTION OF ANTI-ICING FLUID THAT HAD BEEN APPLIED PRIOR TO THE DEPARTURE.