When the air quality is poor, it can make asthma, emphysema, and chronic bronchitis even worse. Meaning, it is able to increase the frequency and intensity of attacks. This is because pollutants can irritate the lungs so that they don't function as well. Poor air quality can also cause digestive issues, chest pain, dizziness, fever, watery eyes and lethargy. There are also some pollutants in the air that can worsen heart disease such as CO. Elderly people, children and people with medical illnesses often have lower immune systems or spend alot of time outside playing making them more likely to catch diseases or make their disease worse from poor air quality,