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Table 2 Concentrations (mean ± SD) of measured pollutants

From: A controlled trial of acute effects of human exposure to traffic particles on pulmonary oxidative stress and heart rate variability

Environmental measurements

Unfiltered rides

HEPA-filtered rides

 

Mean

SD

Median

Mean

SD

Median

Air inside vehicle cabin

      

Particle Number (cm−3)

41,350

12,678

40,806

44,411

16,115

40,063

PM2.5 (μg/m3)

11.7

6.3

10.7

12.2

6.2

10.3

BC (μg/m3)

6.1

3.6

5.5

6.2

2.5

6.2

CO (ppm)

1.1

0.4

1.1

1.3

0.4

1.2

NO2 (ppb)

26

9

26

26

11

24

Temp °C

24.5

2.9

24.2

23.6

2.4

23.8

RH%

25

10

28

27

10

28

Air inside respirator facepiece

    

Particle number (cm−3)

37,999

9,545

37,928

3.5

4.1

2.2

PM2.5 (μg/m3)

9.1

4.8

8.2

1.4

0.6

1.3

  1. Abbreviations: HEPA High-Efficiency Particulate Air.
  2. Pollutant measurements were made in the vehicle cabin air and inside the facepiece of the respirator (particle number and PM2.5 only) during all rides under both unfiltered and filtered conditions.