CLEAN : Blue skies in China's capital spark joy scepticism

The video discusses the reduction of PM 2.5 concentration in Beijing and surrounding areas, noting a significant decrease since 2016. Nationally, the reduction is slower, marking the slowest decline in five years. Weather played a crucial role in reducing pollution, contributing to a 30% reduction in December, with actual figures reaching 40% in Beijing. Measures such as converting from coal to gas for heating and restructuring energy sources have also contributed to pollution control. These efforts, while effective, may increase production costs, prompting factories to relocate.

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