Table 2 Exposure characteristics

PM₁₀, μg/m³

314 ± 27

309 ± 30

310 ± 34

165 ± 16

Total Hydrocarbons, ppm

1.0 ± 0.1

0.9 ± 0.1

0.9 ± 0.2

0.9 ± 0.2

NO_x, ppm

3.9 ± 1.0

4.6 ± 1.0

6.1 ± 0.4

7.3 ± 0.5

NO₂, ppm

0.7 ± 0.1

0.3 ± 0.1

0.4 ± 0.1

0.5 ± 0.1

Temp, C

22 ± 1

22 ± 1

22 ± 2

22 ± 1

Relative humidity, %

36 ± 13

33 ± 11

28 ± 11

30 ± 13

Particle number concentration ×10⁵/cm³

n/a

n/a

1.7 ± 3.2

2.2 ± 1.4

EC/OC, ratio*

0.66 ± 0.01

0.64 ± 0.02

n/d

0.43 ± 0.03

Particle bound PAHs, ng/m³

156 ± 16

127 ± 15

n/d

76 ± 24

Semi volatile PAHs, ng/m³

244 ± 81

158 ± 37

n/d

225 ± 167