As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMELL OF SMOKE IN COCKPIT AND CABIN DESCENDING THROUGH FL 250 TO 120 FT, NOTED IN CLOUD LAYER. CLEARED ONCE OUT OF CLOUD LAYER. SMELLED LIKE BURNING WOOD. C/W GVI OF AIR CONDITIONING SYSTEM AND PERFORMED OPS CHECK, IAW CRJ 900 AMM 21-51-00-710-801. OPS CHECK GOOD, NO DEFECTS NOTED.