SO 2 exhibited an increasing trend with the values in the secondary response stage 1.7 times higher than the SF.
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Characterization of the aerosol chemical composition during the COVID-19 lockdown period in Suzhou in the Yangtze River Delta, China.
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The sentences
The proportions of SO 4 2− shown a decreasing trend with values of 25.5% and 15.1% in the lockdown and secondary response stage despite the slight variation of its concentrations (2.5 and 2.4 μg/m 3 ).