People tour at the terrace of Montparnasse Tower in Paris, capital of France, on Dec. 17, 2016. A new peak in air pollution forced Paris authorities to restrict traffic in French capital on Dec. 16 and Dec. 17. Vehicles, heating systems and wood burning have caused smog spike, the country's worst and longest pollution in a decade. (Xinhua/Chen Yichen)
An indication reading "best view of Paris" is seen on a window of Montparnasse Tower in Paris, capital of France, on Dec. 17, 2016. A new peak in air pollution forced Paris authorities to restrict traffic in French capital on Dec. 16 and Dec. 17. Vehicles, heating systems and wood burning have caused smog spike, the country's worst and longest pollution in a decade. (Xinhua/Chen Yichen)
