Does dust agrivate laryngitis?

Possibly. Most inhaled irritants can cause your laryngitis to feel worse. If you're in a very dusty environment or have an allergy to dust mites, this can affect it. If it gets worse, you may want to see your doctor, and be tested for this allergen.
It may. Laryngitis is inflammation of the larynx. Breathing in dry dusty air may aggravate the condition.
Dust laryngitis. It certainly can aggravate laryngitis and can even cause laryngitis.