In general, how long you hold your breath is not directly related to lung health. Lung health is mainly determined by chest X-ray or CT examination, pulmonary function tests, breathing rate, and your own symptoms. 1. Lung X-ray or CT examination: It can observe the condition of the airways and inside the lungs, and clarify whether there is inflammation, fluid accumulation, masses, nodules and other lesions. 2. Lung function test: It can evaluate the respiratory function of the test taker and determine the airway obstructive disease, airway restrictive disease and airway hyperresponsive disease. 3. Respiratory rate: According to the respiratory rate, generally 12-20 breaths per minute is the normal range. 4. Symptoms: Observe yourself for symptoms such as coughing, coughing up phlegm, chest tightness, chest pain and wheezing. There are other ways to assist in determining lung health, such as conscious lung discomfort, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, a clear diagnosis, so as not to delay the condition.