Narrative:

Climbing through 28;500 feet we received a left duct bleed warning message; we followed the QRH which advised us that if the condition continues for thirty seconds which it did then all bleed sources will be shut down and we will need to follow the procedure for unpressurized flight. I advised ATC of our situation and our need to execute an emergency descent to 10;000 feet. I notified the flight attendants of the situation and our intention to divert. As we descended we heard from the flight attendants that there was now smoke in the cabin. We choose to divert to [a suitable airport] which was about 80 miles away. We notified our company and ATC of our intentions to land and requested emergency services meet us upon landing. After landing and deplaning the passengers the fire department boarded the aircraft and found smoke coming from the overhead panels near the aft lav. Nobody was injured during the event.one thing that both myself and my first officer commented on after the event was that the oxygen masks were dirty and difficult to see through which was a threat. Also my first officer suffered from sinus block during the emergency descent.as a crew I believe we did a great job of course it can always be improved upon. One thing that I would do next time is use speed mode rather than vertical speed during the descent. From the company I would have liked if the oxygen masks were clean. It's a little late for that after we have donned our masks.

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Original NASA ASRS Text

Title: A CRJ-900 flight crew reported receiving a L Bleed Duct warning in climb. The crew executed an emergency descent and diverted to the nearest suitable airport.

Narrative: Climbing through 28;500 feet we received a left duct bleed warning message; We followed the QRH which advised us that if the condition continues for thirty seconds which it did then all bleed sources will be shut down and we will need to follow the procedure for unpressurized flight. I advised ATC of our situation and our need to execute an emergency descent to 10;000 feet. I notified the flight attendants of the situation and our intention to divert. As we descended we heard from the flight attendants that there was now smoke in the cabin. We choose to divert to [a suitable airport] which was about 80 miles away. We notified our company and ATC of our intentions to land and requested emergency services meet us upon landing. After landing and deplaning the passengers the fire department boarded the aircraft and found smoke coming from the overhead panels near the aft lav. Nobody was injured during the event.One thing that both myself and my first officer commented on after the event was that the oxygen masks were dirty and difficult to see through which was a threat. Also my first officer suffered from sinus block during the emergency descent.As a crew I believe we did a great job of course it can always be improved upon. One thing that I would do next time is use speed mode rather than vertical speed during the descent. From the company I would have liked if the oxygen masks were clean. It's a little late for that after we have donned our masks.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.