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

Artificial rainfall (cloud seeding) is achieved by dispersing fine particles of ice-nucleating agents into supercooled clouds. Silver iodide (AgI) has a crystal structure similar to ice and thus serves as an effective nucleus for ice-crystal formation at temperatures below 0 °C. Potassium iodide (KI), when used in conjunction with AgI, enhances the dispersion and stability of the seeding material. Once introduced into the cloud layer—typically by aircraft or ground-based flares—these particles induce the formation of ice crystals. As the crystals grow and fall, they melt into raindrops in warmer layers below, producing precipitation that scavenges airborne pollutants and clears the atmosphere.