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Indian scientists plan to add substances to clouds above the capital New Delhi in an effort to produce rain to reduce pollution. 

印度科学家计划在首都新德里上空的云层中添加物质，以产生降雨来减少污染。

The 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. 

人工降雨的方法称为人工降雨。 该过程涉及向云中添加不同的化学物质以引起降雨。 当雨从天而降时，水滴会附着在污染颗粒上并将其带到地面。 

New 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. 

新德里被评为世界上空气污染最严重的城市。 报道称，最近几周全市的问题变得更加严重。 

Air 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. 

每年冬季到来之前，城市的空气质量都会下降。 在此期间，冷空气可以捕获许多污染物，包括来自车辆、工业、建筑项目和农业燃烧的气体。 

Scientists expect some clouds over the city around November 20. They hope the clouds will result in heavy rainfall – when sprayed with a salt mixture. 

科学家预计 11 月 20 日左右，该市上空将出现云层。他们希望这些云层在喷洒盐混合物后会带来强降雨。 

The 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. 

该项目由中部城市坎普尔印度理工学院的科学家曼宁德拉·阿格拉瓦尔 (Manindra Agrawal) 领导。 他告诉路透社，盐混合物中将含有碘银，以帮助产生降雨。 它将被喷洒在100平方公里的云层上。 阿格拉瓦尔表示，该项目将耗资约 12 万美元。

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