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Rapid industrialization and economic development have led to serious pollution in the form of fine particulate matter (PM2.5, particulate matter with a diameter of less than 2.5 μm). In China, PM2.5 has been one of the most debated topics in councils of government and issues of public concern. Terahertz (THz) radiation was employed to measure the PM2.5 in the atmosphere from September 2014 to April...
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