Preheat the air fryer: Set to 390°F (200°C) for about 3 minutes.
A hot basket helps achieve crisp edges.
Prep the asparagus: Snap off woody ends. Toss spears with 1 tablespoon olive oil, a pinch of salt, and black pepper. Set aside.
Season the salmon: Pat fillets dry.
Rub with 1 tablespoon olive oil, then season with salt, pepper, paprika, minced garlic, and lemon zest. If using Dijon, spread a thin layer on top before seasoning.
Arrange in the basket: Lightly spray the basket or use a parchment liner with holes. Place salmon skin-side down on one side.
Add asparagus on the other side in a single layer.
Air fry: Cook for 7–9 minutes, depending on thickness of salmon and asparagus. Thicker fillets (1 inch or more) may need 10–11 minutes.
Check for doneness: Salmon should flake easily with a fork and reach 125–130°F in the thickest part for medium (or 145°F if you prefer well-done). Asparagus should be tender with lightly crisp tips.
Finish and serve: Squeeze fresh lemon juice over everything.
Add chopped herbs if you like. Serve with extra lemon wedges.