Beijing and Delhi: Two cities and two ways of dealing with smogs

When Beijing's air was forecast to reach hazardous levels for three straight days earlier in December, the government issued a smog red alert. The result: Half the city's cars were off the roads within hours, schools were closed and construction sites shut down. Less than three days later, pollution levels had dropped by 30 percent.

Beijing issues first red alert as air pollution hits

Beijing's Municipal Bureau of Environmental Protection warned that severe pollution would cloak the Chinese capital for several days, starting Tuesday morning.

According to the US Embassy in Beijing, the air quality index stood at 250, classed as "very unhealthy" and 10 times higher than World Health Organization recommended levels.

VIDEO: Kerry urges China on regional peace initiative

Kerry spoke in Hanoi after meeting with Vietnam's Foreign Minister and Deputy Prime Minister, Phan Binh Minh.

Bolt confirms will defend world 100m title in Beijing

Bolt, whose season has been disrupted by a leg injury which caused him to pull out of this month’s Paris and Lausanne meetings in the International Association of Athletics Associations’ (IAAF) Diamond League series, told a press conference: “When the Championship comes, if anyone knows anything about me, I will show up.”