The answer to 'dryer vent smells bad' is that a foul odor coming from your dryer vent is usually caused by lint buildup, mold growth, or trapped moisture. This can lead to a musty, mildew-like smell that permeates your laundry room and nearby areas.
Some common symptoms include a strong, unpleasant odor when the dryer is running, visible lint or debris in the vent, and reduced airflow from the vent. To fix this, you'll need to thoroughly clean the dryer vent and surrounding area. This is generally a DIY task, but you may need to call a professional if the vent is difficult to access or the problem persists.