Parameters

Concentrations recorded inside the classrooms (I)

Concentrations recorded outside the classrooms (O)

Test

Values recommended by WHO

Ratio

Mean ± SD

Mean ± SD

p value

24 hours

I/O

PM2.5 (µg/m³)

60.104 ± 54.918

50.595 ± 33.667

0.125

15

1.188

[15.90 - 513.80]

[12.40 - 222.50]

PM10 (µg/m³)

84.834 ± 77.572

75.335 ± 49.796

0.638

45

1.126

[22.30 - 719.60]

[17.30 - 311.80]