EMB ERJ 145 ER/LR
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Workload; Troubleshooting; Confusion; Distraction
Aircraft Equipment Problem Critical; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Air Traffic Control Provided Assistance; Flight Crew Landed in Emergency Condition; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Diverted
Aircraft
While cruising at FL260 we noticed a strong odor; [a] burning [smell]. We were unable to identify the source. Called the FA (Flight Attendant) to confirm [the] smell in the cabin; and after a few seconds [later] she called back to confirm that it started smelling as well. At this point; we donned masks and [requested priority handling with ATC]; requesting [a] diversion to ZZZ roughly 80 NM away. Ran the QRH; TEST with FA; and notified Dispatch. PA to passengers. Part of the checklist isolates the electrical system which loses the FO (First Officer) NAV (Navigation). So at this point we transfer controls and proceed to land. Taxied to the gate. ARFF (Airport Rescue and Fire Fighting) gave the clear and we deplaned the aircraft. We felt a strong odor in the cockpit [but was] unable to identify the cause. [We responded by] donning masks; checking with FA; [requesting priority handling with ATC] and running [the] QRH. My suggestion is that there should be an automatic email sent to our [Company] email to confirm receipt from safety department.
EMB-145 Captain reported experiencing unusual fumes of an unknown source throughout the aircraft; resulting in a diversion to a suitable airport.