As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB A STRONG ACRID ODOR WAS DETECTED WHICH INCREASED IN STRENGTH & SPREAD TO THE CABIN. SOME EYE IRRITATION NOTICED. ODOR BEGAN TO DISSIPATE AFTER LANDING. EMERGENCY DECLARED & LANDING UNEVENTFUL. LANDING UNEVENTFUL. TROUBLE SHOT IAW 21-20-00 & DETERMINED POLLEN TO BE ODOR SOURCE. ACCOMPLISHED PACK BURN OUT IAW CARD 21-92-12. SYS CHECKED NORMAL.