EMB ERJ 145 ER/LR
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Physiological - Other
Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Air Traffic Control Provided Assistance; Flight Crew Diverted; Flight Crew Landed in Emergency Condition; General Maintenance Action
Aircraft
In cruise at flight level 250 smoke began to fill the cockpit. Captain and I observed a burning smell and our eyes were irritated. Our Flight Attendant happened to be on the interphone at the same time and also noticed smoke in the cabin particularly near row 18. We executed the Cabin Fire or Smoke immediate action items and proceeded to the QRH. QRH first directed us to the Air Conditioning Smoke procedure. We closed both engine bleeds and began a descent to 11000. At this point the smoke seemed to stop and slowly dissipated. Cause: Overweight landing: we elected to land 300 pounds over MLDW; Captain and I agreed the risk associated with continuing the flight to burn fuel were greater than landing slightly overweight. Suggestions: The company should determine the source and cause of the smoke.
EMB-145 First Officer reported smoke in cockpit; flight attendants reported smoke in the passenger cabin as well. Flight crew executed an uneventful diversion.