Hi..., Most cases of acute bronchitis resolve without medical treatment in two weeks... . Bronchitis usually results from a viral infection, so antibiotics aren't effective. .. Use a humidifier. Warm, moist air helps relieve coughs and loosens mucus in your airways.... Consider a face mask outside. If cold air aggravates your cough and causes shortness of breath, put on a cold-air face mask before you go outside... Consult Physician...