For breathing difficulties triggered by dust and smoke, you likely need a combination of medications. Daily antihistamines (such as Cetirizine) can control allergy symptoms, but for breathing tightness, a doctor may prescribe a quick-relief bronchodilator inhaler (like Albuterol) to open your airways. If symptoms are frequent, a daily controller corticosteroid inhaler may be necessary. Because breathing difficulty can indicate asthma, it is crucial to consult a physician or pulmonologist for a proper diagnosis and personalized prescription. Please avoid self-medicating, and try to wear an N95 mask when exposed to dust or smoke.