Preheat your air fryer to 400°F (200°C).
Pat the chicken wings thoroughly dry with paper towels to ensure the skin gets maximum crispiness.
In a large mixing bowl, toss the wings with avocado oil, baking powder, sea salt, black pepper, garlic powder, smoked paprika, and cayenne pepper until evenly coated.
Arrange the wings in a single layer in the air fryer basket, making sure they are not touching to allow for proper airflow.
Air fry for 20-25 minutes, flipping the wings halfway through, until the skin is golden brown and very crispy.
While the wings are cooking, whisk together the non-fat Greek yogurt and dried dill in a small ramekin to create a cooling dip.
Once the wings are done, transfer them to a clean bowl and toss with the sugar-free BBQ sauce until every wing is well-glazed.
Serve the hot wings immediately alongside the fresh celery sticks and the prepared yogurt dip.