Fine dust inflow paths and heating load variation based on field measurement of air tightness in two Korean schools.

As the level of PM2.5 shows a decreasing trend with an increasing wind velocity, the observed level of PM2.5 was high [ 21 ].

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For instance, in the absence of an indoor air source, the I/O ratio displays an increasing trend as the air exchange rate increases, but if the outdoor fine dust concentration is extremely low, a decreasing trend with increasing air exchange rate is observed [ 24 ].

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