"The Chinese government must take emergency measures to curb nationwide air pollution," Greenpeace said.
Some 92 percent of Chinese cities failed to reach the national standard in 2013, with 32 of them double the national standard while the top 10 were three times the standard.
North Chinese cities, especially those in Hebei Province, suffered the most serious pollution. Seven of the top 10 most polluted cities are in Hebei, led by Xingtai and Shijiazhuang. Both are important industrial cities.
Xingtai's annual PM2.5 density reached 155.2 micrograms per square meter.
The air in China's central and west cities, such as Xi'an in Shaanxi Province, Zhenzhou in Henan and Wuhan in Hebei, was also highly polluted last year, Greenpeace said.
China is to spend 5 billion yuan (US$818 million) to curb air pollution in north China and aims to slash PM2.5 density by 25 percent in the region within five years.
The fund, mainly to reward effective measures taken by regional governments, will be used to improve the air in Beijing and Tianjin, Inner Mongolia Autonomous Region and Hebei, Shanxi and Shandong provinces, according to the Ministry of Finance.
Hebei will be one of the campaign's major targets.
Haikou in Hainan Island had the best air quality among the 74 cities, with an annual PM2.5 density of 25.6, followed by Lhasa in Tibet and Xiamen in southeast Fujian Province.
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