Dust particle characteristics in general office environment

Experimentally studies the distribution characteristics of the indoor dust particles and the ratio of the indoor to outdoor particle concentrations (I/O). The results indicate that the indoor and outdoor particles are mainly smaller particles, with those of 1.0 to 3.0 μm in diameter accounting for 46.70% and 45.06% of the TSP of indoor and outdoor respectively; the I/O value of TSP is in the range of 0.61 to 0.72, and the I/O value of PM10 is in the range of 0.64 to 0.74; the I/O value reduces with the increase of the diameter and is in the range of 0.406 to 0.995, and the variation trend is that the I/O value drops sharply with smaller diameter and then appears a gentle decline, which is different from that on natural ventilation conditions.