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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, μg/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, μg/m3 16.6 (16.7) 17.5 7.2 44.5
Modeled daily residential PM 2.5
Day of the examination (lag 0), μg/m3 22 (15.5) 11 26.3 42.5
Day before the examination (lag 1), μg/m3 19 (18.3) 7.4 24.2 40.1
Two days before the examination (lag 2), μg/m3 18.6 (20.6) 6.7 18.4 68.9
Average of 48h before the examination, μg/m3 18.8 (18.7) 7.9 20.8 57.8
  1. SD standard deviation, P25 25th percentile, P75 75th percentile, P90 90th percentile