https://www.eco-business.com/zh-hans/news/delhi-looks-to-artificial-rain-to-clear-airpocalypse-smog/
After Diwali fireworks choke Delhi, authorities plan artificial rain to clear the air.
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https://www.wfae.org/world/2013-01-14/beijings-airpocalypse-spurs-pollution-controls-public-pressure
The air in China's capital has been classified as hazardous to human health for a fifth consecutive day. Environmentalists say it's the worst pollution since...
pollution controlspublic pressurebeijingairpocalypsespurs