The normal human pulmonary system is made up of a number of components which work together to provide oxygen to the blood stream which is delivered to vital organs and remove waste products including CO2. The system includes the diaphragm, a muscle which through it's downward movement increases the size of the pleural (lung) space, allowing inhalation.
Natural disasters, such as hurricanes and floods, can leave a lot of debris. Some of this debris may be burned during cleanup. Smoke from these outdoor fires is unhealthy for you to breathe. Smoke may cause you to cough. It can cause shortness of breath or tightness in the chest. It also can sting your eyes, nose, or throat.