Artificial way of causing rainfall to reduce air pollution makes use of

Cloud seeding, the artificial method of inducing rainfall (used to reduce air pollution, address drought, etc.), commonly uses silver iodide (AgI) and potassium iodide (KI) as nucleating agents. Silver iodide has a crystalline structure similar to ice, which makes it effective in inducing ice crystal formation in supercooled clouds. Potassium iodide serves as a complementary nucleating agent. Other substances like dry ice and sodium chloride may also be used in certain conditions, but for cold-cloud seeding to reduce pollution, silver iodide and potassium iodide are the standard combination.