Delhi set for artificial rain: What is cloud seeding? How it's done and the science behind it

Delhi is set to attempt artificial rainfall today. This cloud seeding operation aims to clear the city's toxic air. The trial depends on weather conditions in Kanpur. If successful, it could bring much-needed rain to wash out pollutants. This is a joint project by IIT Kanpur and the Delhi Government. It is the fourth attempt to curb severe air pollution.