Table 1: Collection sites, air volume, PM 2.5 µm concentration, and extractable organic matter (EOM) of the samples analyzed.

SiteMonthAir volume
(m3) ± S.D.
PM 2.5 µm individual values
(µg/m3)
PM 2.5 µm
(µg/m3) ± S.D.
EOM
(µg/m3)

August1513 ± 3617.51/18.63/13.63/45.0923.71 ± 14.419.66
1September1582 ± 5323.43/43.83/40.24/14.4830.49 ± 13.897.92
October1623 ± 14814.46/13.61/21.73/11.2715.27 ± 4.515.54

August1541 ± 140.19/44.59/44.01/51.7745.14 ± 4.837.76
2September1554 ± 3113.76/34.66/41.58/15.2026.30 ± 13.947.24
October1640 ± 19422.48/36.47/11.74/25.0823.94 ± 10.155.48

August430 ± 6742.38/168.85/35.60/131.3394.54 ± 66.0020.93
3September420 ± 4068.85/167.33/91.55/61.0197.18 ± 48.5221.44
October359 ± 677.15/239.77/75.68/138.33132.73 ± 77.0925.05

1: UERJ; 2: Avenida Brasil; 3: Rebouças tunnel; S.D.: standard deviation; airborne PM 2.5 µm samples were collected for 24 h at sites 1 and 2 and 6 h at site 3. Six-h time filter saturation at site 3.