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Delhi uses cloud seeding for rain and pollution control

Manjinder Singh Sirsa, the Environment Minister in Delhi's capital territory, said that authorities began to seed clouds in the city on Tuesday in order to bring artificial rain in and reduce pollution levels. The city has been struggling with poor air quality for several days.

This method aims to increase rainfall by adding chemical particles around the water droplets that form in clouds.

This is the first attempt in the Indian capital. Although cloud seeding has been used by several countries to increase rain and improve air quality, or to water crops during a drought, it was not until now that the technique had been tried. Studies have shown mixed results on the effectiveness of cloud-seeding.

Sirsa stated that the Indian Institute of Technology believed rainfall could occur anywhere between 15 minutes and four hours after the seeding procedure, in any amount.

He said that if the trials are successful, then a long-term strategy will be implemented until February.

Images shared by IIT-Kanpur show substances being released as flares are attached to an airplane while it is flying in a cloudy atmosphere.

Delhi and the surrounding areas are susceptible to pollution each winter, as the cold, heavy air traps dust from construction, vehicle emissions and smoke from fires in crops, causing respiratory problems for many of Delhi's 20 million residents.

According to the Central Pollution Control Board (CPCB), an air quality index between 0 and 50 is considered 'good.' The air quality in the city remained'very bad' on Tuesday afternoon with a reading 304.

Manindra Agrawal is a scientist from IIT-Kanpur. She said that artificial rain caused by cloud seeding could reduce pollution by up to 50%. However, it may be necessary to repeat the process.

"If it rains pollution will come down (but) it'll rise again because... the source hasn't gone." "Whenever there is cloud cover, you have to repeat the procedure," he said. (Reporting and editing by YPrajesh, Kim Coghill, and Sakshi Dayal)

(source: Reuters)