Highlights

•    Soil-originated airborne particles may hamper the indoor air quality in schools.
•    Particle mass and number concentrations were measured by direct-reading instruments.
•    The elemental and carbon composition of the dust were investigated.
•    Shoeless course in schools reduced particle mass concentration significantly.
•    Shoeless course can enhance the IAQ and comfort in the premises.

iStock, RyanJLane

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