During a two-year installation, the number of observation stations of China’s environmental air quality monitoring network has significantly increased, growing from more than 300 in 2013, when the project was launched, to more than 1,000 in 2015. Scientists have placed these stations in densely populated core urban areas as well as relatively low-density suburbs. With more than three times the number of original stations, there is uncertainty regarding the ability of the much larger network to assess air quality compared to previous data.
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Source: Phys.org