Research showing high levels of nitrogen-containing compounds in Beijing's smog should not set off alarm bells, the Environmental Protection Bureau said.
Photo taken on Feb 15, 2013 shows the night scene of the Qianmen Street, a well-know commercial street, in downtown Beijing, capital of China.
Construction of a new subway line will start next month in Beijing to help ease traffic in the Chinese capital.
Fresh smog shrouded Beijing and some other provinces in China early on Sunday, disrupting highway traffic and flights.
Beijing reaped 3.88 billion yuan (617.8 million US dollars) in tourism revenue during this year's seven-day Spring Festival holiday, up 15 percent year on year, local authorities said Friday.
A total of 7.48 million local residents and tourists have visited parks and scenic spots in Beijing during this year's Spring Festival holiday, which began on February 10.
Sales of fireworks and the number of people injured due to fireworks setting off in Beijing have dropped significantly during this year's Spring Festival holiday.
Four days after the massive fireworks displays that marked Lunar New Year's Eve, Beijing's municipal weather bureau has maintained a warning against exercising outdoors due to the city's air pollution.
People skate at the Summer Palace in Beijing on February 11, 2013. The Chinese are on a week-long holiday in celebration of the Chinese New Year, or the Spring Festival which started on February 10 this year according to the Chinese lunar calendar. [Photo/Xinhua]
China's capital of Beijing has set a target of completing environmentally friendly renovations on all its coal-fired heating furnaces by 2015.
Beijing has its own traditions for celebrating the Spring Festival.
China's overcrowded capital saw its streets empty on Saturday, as mass numbers of people are leaving the metropolis to visit their relatives.