New Delhi, Nov. 6 -- Ahead of the pollution season in the city, trial runs for cloud seeding were carried out again this year, said officials from IIT Kanpur and the Delhi government. The tests were run in early October to gather fresh data on meteorological conditions, outline flight paths and the study the possible impact of silver iodide on reducing pollutants in the area. Cloud-seeding is a weather modification technique that improves a cloud's ability to produce rain. Silver iodide (AgI) and other compounds are introduced to initiate microphysical changes in the cloud, encouraging the formation of ice crystals or raindrops. The government undertook multiple such trials last winter,firing off chemical flares containing silver iodide an...