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epa08056458 A thick haze engulfs the Forbidden City in Beijing, China, 09 December 2019. The PM 2.5 air quality index measuring fine particle air pollution in Beijing reached around 250 on 09 December. A China delegation is currently attending the United Nations Climate Summit (COP25) in Spain. The Asian giant is hoping to establish itself as the new global leader in the fight against climate change, following the United States' withdrawal from the Paris Agreement signed in 2015. (KEYSTONE/EPA/ROMAN PILIPEY)