Air pollution: Particulate matter, ozone, nitrogen dioxide, and sulfur dioxide are common pollutants linked to respiratory and cardiovascular diseases. Water contamination: Pollutants like heavy metals (e.g., lead, mercury), pesticides, and industrial chemicals can contaminate drinking water sources, leading to various health issues. Chemical exposures: Exposure to toxic chemicals such as asbestos, benzene, and formaldehyde can increase the risk of cancers and other chronic diseases. Climate change: Changes in climate can influence the spread of infectious diseases, increase the incidence of heat-related illnesses, and exacerbate chronic conditions.