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Heavy air pollution reduces life expectancy, a new study has found, ringing an alarm for policymakers looking to create their future energy roadmap.

The research, published in the Proceedings of the National Academy of Sciences, a US multidisciplinary scientific serial, said on Tuesday that air pollution from burning coal caused people in northern China to live an average of 5.5 years less than the people living in the south. Coal burning has been providing heat to the north for decades.

"The study gives a clear answer to the link between life expectancy and air pollution," said Li Hongbin, an economics professor at Tsinghua University School of Economics and Management in Beijing who collaborated with researchers in China, the US and Israel on the study.

The study analyzed the total suspended particulate matter and deaths in 90 cities across China from 1981 to 2000, finding a sharp difference in mortality rates on either side of the Huaihe River, which is the border giving people living north of the line free heating in winter.

"With the heating policy, the northern areas have been exposed to more pollution than the southern areas, which makes the study possible," Li said, adding that low rates of migration during this period were also key to the study.

Air pollution in the north from burning coal was 55 percent higher than in the south between 1981 and 2000, while life expectancies were 5.5 years lower on average across all age ranges.

The researchers said the difference in life expectancies was due mainly to increased deaths caused by diseases related to air quality, such as heart disease, strokes, lung cancer and respiratory illnesses.

Their analysis estimated that every additional 100 milligrams of total suspended particulate matter per cubic meter in the atmosphere lowers life expectancy at birth by about three years.

Total suspended particulate matter includes large particles and PM 2.5 - particles with diameters of less than 2.5 micrometers - which are of great health concern because they can penetrate deep into the lungs. However, the researchers lacked the data to analyze those tiny particles separately.

"The real situation might be worse than the study showed, because PM 2.5 can be more harmful to health," Li added.

Gan Quan, senior project officer of the International Union Against Tuberculosis and Lung Disease, said the study was necessary in helping authorities become aware of the impact of air pollution and to adjust policies.

"We need such research to give a clear link between air pollution and life expectancy," Gan said.

Li agreed, adding that the study wasn't meant as a comment on the coal-heating policy, but to let the results show that the Chinese government should make an effort to fight air pollution.

（中國(guó)日?qǐng)?bào)網(wǎng)英語(yǔ)點(diǎn)津 Helen 編輯）

About the broadcaster:

Nelly Min is an editor at China Daily with more than 10 years of experience as a newspaper editor and photographer. She has worked at major newspapers in the U.S., including the Los Angeles Times and the Detroit Free Press. She is also fluent in Korean.