Environmental factors can affect health in multiple ways. For instance, poor air quality can lead to respiratory diseases such as asthma and chronic obstructive pulmonary disease (COPD). Contaminated water sources can result in gastrointestinal infections. Climate change can also exacerbate the spread of vector-borne diseases such as malaria and dengue fever. Moreover, exposure to toxic substances like lead and asbestos can lead to severe, long-term health effects.