Microscopic Characterization of Individual Aerosol Particles in a Typical Industrial City and Its Surrounding Rural Areas in China.

Specifically, from U1 to U2, the average concentrations of SO 2 , CO, and NO 2 exhibited a decreasing trend, with values decreasing from 5.6 ± 1.5 μg/m 3 , 1.8 ± 0.4 mg/m 3 , and 76.9 ± 31.4 μg/m 3 to 2.3 ± 0.5 μg/m 3 , 0.5 ± 0.2 mg/m 3 , and 19.1 ± 11.5 μg/m 3 , respectively, i.e., decreases of 58.9%, 72.2%, and 75.2%, respectively.

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