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Beijing Smog Reaches Peak Levels Stifling City

Beijing suffered its worst air pollution of the year on Monday.

. A man wearing a mask walks past the China Central Television (CCTV) building during a heavily polluted day in Beijing on Nov. 30, 2015.

Beijing suffered its worst air pollution of the year on Monday, with monitoring sites throughout the city reporting extremely hazardous levels of pollutants.

City authorities issued a rare orange alert, the second highest of four danger levels.

Kim Kyung-Hoon / Reuters

. Pedestrians wear masks as they make their way through Beijing on Nov. 30.

Kim Kyung-Hoon / Reuters

. A mother helps her child get up on a viewing deck of a tourist tower as smog is seen over parts of Beijing on Nov. 29.

Visibility was cut to several hundred yards, as buildings receded into thick smog.

Rolex Dela Pena / EPA

. A woman wears a mask on a polluted day in Beijing on Nov. 30.

Fred Dufour / AFP - Getty Images

. People pass by Tiananmen Square during heavy pollution on Nov. 30.

Kevin Frayer / Getty Images

. Motorists ride on a street shrouded in smog in Beijing on Nov. 30. Beijing issued an orange alert for heavy smog, the highest level this year. Authorities in the Chinese capital warned of 'severe pollution' and advised the capital's 20 million inhabitants to stay indoors.

How Hwee Young / EPA

. A couple wears protective masks as they walk outside the Forbidden City on Nov. 30 in Beijing.

Kevin Frayer / Getty Images

. Buses and cars cause heavy traffic on roads in Beijing on Nov. 30.

Andy Wong / AP

. A baby is held inside a vehicle stranded on a highway between Beijing and Hebei province, China, that is closed due to smog on Nov. 30.

Damir Sagolj / Reuters

. People walk past the giant portrait of late Chinese Chairman Mao Zedong, at the Tiananmen Gate in Beijing on Nov. 30.

Kim Kyung-Hoon / Reuters

. Pedestrians and police cross the street at a crosswalk at Tiananmen Square in Beijing on Nov. 30.

Kim Kyung-Hoon / Reuters

. An official wears a mask due to the pollution in Beijing on Nov. 30.

Fred Dufour / AFP - Getty Images

. A couple wearing face masks talk at bus station on Nov. 30 in Beijing, China.

Lintao Zhang / Getty Images