3 February 2015 Last updated at 07:44 ET
A Chinese man wears a mask to protect against pollution as he uses his smartphone on a hazy day outside the Forbidden City 20 November 2014 in Beijing, China
The air in the capital of Beijing did not meet quality standards, according to Chinese authorities
Only eight out of China’s 74 biggest cities passed the government’s basic air quality standards in 2014, the environment ministry has said.
The most polluted cities were in north-eastern Hebei, the province that surrounds the capital Beijing.
Beijing and Shanghai both failed the assessment, which was based on measurements of major pollutants.
China is attempting to cut pollution but the country still relies heavily on coal for its energy needs.
The government shut more than 8,000 coal-burning factories in Hebei last year.
But the BBC’s Celia Hatton in Beijing says like many places in China, the authorities are struggling to balance factory closures with the demands of the country’s slowing economy.
The environment ministry’s statement published on its website (in Chinese) noted that the 2014 result was an improvement over the previous year, where only three cities met the standards.
But it added that “presently, the country’s air pollution situation remains serious”.
