Table 2 Concentration of contaminant groups in the extracts from PM2.5 (ng/m³)

Polycyclic aromatic compounds

U.S. EPA PAHs (10)*

76.3

13.6

17.1

5.89

other PAHs (29)

44.3

7.14

9.29

3.28

alkylated PAHs (46)

29.7

7.36

5.88

4.98

oxidized PAHs (7)

36.1

11.0

12.8

2.02

N-heterocyclic PAHs (PANHs) (13)

19.9

4.27

3.13

0.46

S-heterocyclic PAHs (PASHs) (8)

9.99

2.27

1.80

0.42

nitrated PAHs (15)

0.38

0.05

0.04

0.02

dinitrated PAHs (3)

0.00097

0.00008

0.00005

0.00005

Hydrocarbon markers

n-alkanes (29)

84.4

89.5

77.4

89.2

UCM (unresolved complex mixture) **

20.1

15.3

9.19

12.7

terpanes (15)

14.8

9.34

5.64

4.14

triterpanes (13)

4.49

3.16

1.49

3.73

steranes (19)

2.24

2.68

0.85

1.76

Sterols

faecal sterols (8)

0.38

0.12

0.17

0.88

phytosterols (5)

1.04

0.20

0.59

1.63

Industrial contaminants

musk compounds (9)

0.01

0.003

0.003

0.06

dialkyl-phthalates (6)

0.75

0.60

0.34

2.08

bisphenol A

0.18

0.09

0.10

0.09

benzophenone

0.24

0.05

0.04

0.04

isomyristate

0.19

0.10

0.07

0.46