In January 2014, the vast screen of Tiananmen Square in Beijing, usually used to spread regime propaganda to tourists and citizens, exhibited fiery sunsets and clear blue skies crossed by the crests of the mountains. The long luminous strip was embedded, incongruous and disturbing, in the dense poisoned atmosphere, an ashy blanket capable of devouring the figures of men and things. In those days, the World Health Organization warned the Chinese government with the pollution data, twenty times higher than the recommended threshold.