The so-called APEC Blue skies enjoyed by China's capital have vanished, replaced by the choking smog for which the city is notorious for.
The government had managed to clear Beijing's skies for the Asia Pacific Economic Cooperation summit (APEC) by closing factories and reducing traffic. Just day after the summit ended, high levels of air pollution have returned, dashing hopes the city would hold on to pollution-free skies.
Al Jazeera's Adrian Brown reports from Beijing.
Source: Al Jazeera