Since Neosporin-H is unavailable, you can manage dust-induced nasal irritation effectively with simpler alternatives. For dryness and soothing, apply a thin layer of plain petroleum jelly or use a saline nasal gel or spray to moisturize the nasal passages. If the irritation involves swelling or allergy symptoms, a generic steroid nasal spray, such as fluticasone propionate, can help reduce inflammation. I also highly recommend wearing a protective mask (like an N95) at your workplace to prevent dust inhalation. Please consult a local doctor to get a proper prescription for any steroid spray and to ensure your nasal passage is healthy.