Which of the following are used in cloud seeding for artificial rainfall to reduce air pollution?

Cloud seeding is a weather modification technique used to induce artificial rainfall. The most commonly used chemicals are silver iodide (AgI) and potassium iodide (KI), along with dry ice (solid CO₂). Silver iodide has a crystalline structure similar to that of ice, which makes it an excellent ice nucleus around which water droplets can condense and grow into raindrops. Potassium iodide serves a similar nucleation function. These substances are dispersed into clouds via aircraft or ground generators to enhance precipitation, which can help wash down particulate pollutants and reduce air pollution.