Cancer
Cancer is a disease caused by the transformation of healthy cells into abnormal cells that proliferate excessively. These cells can form a mass known as a "malignant tumor." Cancerous cells tend to detach from the tumor and invade neighboring tissues. They then migrate through the bloodstream and lymphatic vessels to form other tumors, referred to as metastases.
Cancers can result from prolonged exposure to various factors, such as pollutants and particulate matter found in both outdoor and indoor air.