The number of baseline deaths from respiratory diseases showed a trend of decreasing first and then increasing.
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Value Assessment of Health Losses Caused by PM<sub>2.5</sub> in Changsha City, China.
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The sentences
Through the monthly concentration change of PM 2.5 from December 2013 to December 2017 on a longer time scale, it can be seen that the concentration change of Changsha City is cyclical and demonstrates a decreasing trend year by year.