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Table 6 Concentrations of PM10 in indoor (I) and outdoor (O) air of residences and the I/O ratios [18]

From: Indoor Air Pollution and Its Control in China

Residence Sampling times Average concentration of PM10 (mg/m3) I/O ratio
Indoor Outdoor
Without indoor PM source 3 0.093 0.107 0.869
With smoking 3 0.109 0.060 1.817
With cooking 3 0.067 0.060 1.117