In addition, intensity–duration–frequency of high PM2.5 concentration (lasts over 90 μg/m 3 in 2 h) showed an increasing trend [ 8 ].
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A Study on the Preliminary Plan for Environmental Health in Seoul, Korea.
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In addition, intensity–duration–frequency of high PM2.5 concentration (lasts over 90 μg/m 3 in 2 h) showed an increasing trend [ 8 ].