The answer to 'why is my dryer vent odor' is that a smelly dryer vent is typically caused by a buildup of lint, dust, and debris in the vent or ductwork. This can lead to mold, mildew, and other unpleasant odors. Common symptoms include a musty or burning smell coming from the dryer, reduced airflow, and longer drying times.
The best solution is to regularly clean the dryer vent and ductwork. This involves disconnecting the vent from the dryer, using a vent brush or vacuum hose to remove any lint and debris, and checking for any blockages or damage to the vent. If the odor persists or you're unable to fully clean the vent, it's best to call a professional dryer vent cleaning service to ensure the issue is properly resolved.