The authors said their research can be used to estimate the effect of total suspended particulates on other countries and time periods. Their analysis suggests that every additional 100 micrograms of particulate matter per cubic meter in the atmosphere lowers life expectancy at birth by about three years.
The study also noted that there was a large difference in particulate matter between the north and south, but not in other forms of air pollution such as sulfur dioxide and nitrous oxide.
Francesca Dominici, a professor of biostatistics at Harvard School of Public Health who has researched the health effects of fine particulate matter in the U.S., said the study was “fascinating.”
China’s different treatment of north and south allowed researchers to get pollution data that would be impossible in a scientific setting.
Dominici said the quasi-experimental approach was a good approximation of a randomized experiment, “especially in this situation where a randomized experiment is not possible.”
She said she wasn’t surprised by the findings, given China’s high levels of pollution.
“In the U.S. I think it’s pretty much been accepted that even small changes in PM2.5, much, much, much smaller than what they are observing in China, are affecting life expectancy,” said Dominici, who was not involved in the study.
一项新的研究表明由于烧煤引发的严重空气污染将缩短中国北方居民的寿命。研究人员估计,因为呼吸更污浊的空气,上世纪90年代居住于北方的5亿居民要比南部的居民平均少活5年。
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