Indian Cloud-seeding Project Aims to Produce Rain to Clear Pollution
2023-11-23
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1Indian scientists plan to add substances to clouds above the capital New Delhi in an effort to produce rain to reduce pollution.
2The method to artificially produce rain is called cloud seeding.
3The process involves adding different chemicals to clouds to cause rain.
4When rain falls from the sky, water droplets can attach to pollution particles and bring them down to the ground.
5New Delhi has been rated the city with the most air pollution in the world.
6Reports say the problem has worsened across the city in recent weeks.
7Air quality decreases in the city ahead of winter each year.
8During this time, cold air can trap many pollutants, including gases from vehicles, industry, building projects and agricultural burning.
9Scientists expect some clouds over the city around November 20.
10They hope the clouds will result in heavy rainfall - when sprayed with a salt mixture.
11The project is being led by Manindra Agrawal, a scientist at the Indian Institute of Technology in the central city of Kanpur.
12He told Reuters news agency the salt mixture will include silver iodine to help produce rain.
13It is to be sprayed on clouds over a 100 square kilometer area.
14Agrawal said the project will cost about $120,000.
15The local government in New Delhi, a city of 20 million people, has already closed schools, stopped building activities, and said it will place restrictions on vehicle use to control pollution.
16The air quality index in the city was 506 on November 9.
17This level is considered "hazardous" by IQAir, a Swiss company that describes itself as an "air quality solutions" business.
18Gufran Beig is head of the Indian government's air-quality measuring agency SAFAR.
19He told Reuters the city needs heavy and widespread rain to wash away the pollutants.
20Beig added that light rain could worsen the situation.
21The SAFAR head said current airflow is carrying smoke from crop burning in the states of Punjab and Haryana to Delhi.
22This smoke adds to the city's existing pollution sources.
23"So, unless a huge pressure is established by intense rain, this chain of transport from Punjab to Delhi will not be broken," Beig said.
24About 38 percent of pollution in the capital has been caused by stubble burning in Punjab and Haryana, a recent government statement said.
25Farmers carry out stubble burning to clear material left behind from rice harvests so they can plant other crops.
26Indian officials directed leaders in both states to "take effective actions" to identify and limit stubble burning, the statement added.
27Officials in New Delhi are seeking approval for the project from the Supreme Court, Reuters reported.
28Several countries have used cloud seeding in an effort to produce rain, improve air quality and water crops in times of extreme dryness.
29These include Mexico, the United States, China, Indonesia and Malaysia.
30I'm Bryan Lynn.
1Indian scientists plan to add substances to clouds above the capital New Delhi in an effort to produce rain to reduce pollution. 2The method to artificially produce rain is called cloud seeding. The process involves adding different chemicals to clouds to cause rain. When rain falls from the sky, water droplets can attach to pollution particles and bring them down to the ground. 3New Delhi has been rated the city with the most air pollution in the world. Reports say the problem has worsened across the city in recent weeks. 4Air quality decreases in the city ahead of winter each year. During this time, cold air can trap many pollutants, including gases from vehicles, industry, building projects and agricultural burning. 5Scientists expect some clouds over the city around November 20. They hope the clouds will result in heavy rainfall - when sprayed with a salt mixture. 6The project is being led by Manindra Agrawal, a scientist at the Indian Institute of Technology in the central city of Kanpur. He told Reuters news agency the salt mixture will include silver iodine to help produce rain. It is to be sprayed on clouds over a 100 square kilometer area. Agrawal said the project will cost about $120,000. 7The local government in New Delhi, a city of 20 million people, has already closed schools, stopped building activities, and said it will place restrictions on vehicle use to control pollution. 8The air quality index in the city was 506 on November 9. This level is considered "hazardous" by IQAir, a Swiss company that describes itself as an "air quality solutions" business. 9Gufran Beig is head of the Indian government's air-quality measuring agency SAFAR. He told Reuters the city needs heavy and widespread rain to wash away the pollutants. Beig added that light rain could worsen the situation. 10The SAFAR head said current airflow is carrying smoke from crop burning in the states of Punjab and Haryana to Delhi. This smoke adds to the city's existing pollution sources. "So, unless a huge pressure is established by intense rain, this chain of transport from Punjab to Delhi will not be broken," Beig said. 11About 38 percent of pollution in the capital has been caused by stubble burning in Punjab and Haryana, a recent government statement said. Farmers carry out stubble burning to clear material left behind from rice harvests so they can plant other crops. Indian officials directed leaders in both states to "take effective actions" to identify and limit stubble burning, the statement added. 12Officials in New Delhi are seeking approval for the project from the Supreme Court, Reuters reported. 13Several countries have used cloud seeding in an effort to produce rain, improve air quality and water crops in times of extreme dryness. These include Mexico, the United States, China, Indonesia and Malaysia. 14I'm Bryan Lynn. 15Reuters reported this story. Bryan Lynn adapted the report for VOA Learning English. 16____________________________________________ 17Words in This Story 18artificial - adj. not natural, but made by people 19salt -n. a word for one of many chemical combinations of two elements; sodium chloride 20stubble - n. small pieces of dried plant stems left behind in a field after it has been cut