Skyscrapers are seen shrouded in fog in Hefei, Anhui province, China
Chinese employees work during heavy fog in Huaibei, eastern Anhui, China
At the Tidal Basin near the Kutz Bridge, Washington, DC, US
Near the Martin Luther King Jr. memorial, Washington, DC, US
Near the Washington Monument, Washington, DC, US
Near the Jefferson Memorial in Washington, DC, US
People walk through heavy fog in Chennai, India
Members of Kolkata Mounted Police take part in a rehearsal parade -Kolkata, India
The Brooklyn Bridge is seen partially in fog New York, US
A person stands on the boardwalk over the river Liffey in Dublin, Ireland
A person cycles through heavy fog in Dublin, Ireland
A seagull starts flight from a railing of Hohenzollernbruecke bridge, Cologne, Germany
Commuters silhouette against the backlight of car headlights- Berlin, Germany