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In 2006, he founded the Institute of Public and Environmental Affairs (IPE) – a non-profit environmental research organisation based in Beijing.

But significant improvements have been seen in water quality over the years, with more than 90 per cent of water at national control sections now being graded as “excellent”, “good” or “fair”, according to Ma.

Research also shows that, from 2015 to 2022, the average annual level of PM2.5 – particles in the air measuring less than 2.5 micrometres and a key indicator of air pollution – fell by around 35.6 per cent nationwide.

This reduction is similar in scale to the improvements achieved by the United States across three decades under the Clean Air Act.