Skip to main content

Table 2 Recent exposure to fine (PM2.5) and ultrafine (UFP) particles at the school site

From: Recent exposure to ultrafine particles in school children alters miR-222 expression in the extracellular fraction of saliva

Pollutant indicator

Mean (SD)

P25

P75

P90

Indoor at school during the examination

UFP, #/cm3

10304 (6115)

5577

14081

18852

PM2.5, ÎĽg/m3

4.6 (3.6)

2.2

5.0

10.0

Outdoor at school during the examination

UFP, #/cm3

32134 (21572)

15842

44618

67838

PM2.5, ÎĽg/m3

16.6 (16.7)

17.5

7.2

44.5

Modeled daily residential PM 2.5

Day of the examination (lag 0), ÎĽg/m3

22 (15.5)

11

26.3

42.5

Day before the examination (lag 1), ÎĽg/m3

19 (18.3)

7.4

24.2

40.1

Two days before the examination (lag 2), ÎĽg/m3

18.6 (20.6)

6.7

18.4

68.9

Average of 48h before the examination, ÎĽg/m3

18.8 (18.7)

7.9

20.8

57.8

  1. SD standard deviation, P25 25th percentile, P75 75th percentile, P90 90th percentile