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Table 2 Levels of personal exposure to PM 2.5 and Elemental Carbon (EC) during work hours, and of ambient PM 10 on and before the examination days

From: Inhalable particulate matter and mitochondrial DNA copy number in highly exposed individuals in Beijing, China: a repeated-measure study

Time window

Office workers

Truck drivers

 

N

Mean

SD

10pct

25pct

Median

75pct

90pct

N

Mean

SD

10pct

25pct

Median

75pct

90pct

p-value

Personal PM 2.5 (μg/m 3 ) on the examination days, from personal monitors a

 

8 hours

120

94.6

64.9

22.4

48.5

86.2

126.6

183.4

119

126.8

68.8

46.3

73.9

116.8

160.5

213.9

<0.001

Personal EC (μg/m 3 ) on the examination days, from personal monitors a

8 hours

118

13.0

4.0

7.1

10.0

13.2

15.8

18.4

120

17.2

6.6

9.2

12.9

16.7

20.9

26.1

<0.001

Ambient PM 10 (μg/m 3 ) from ambient monitors on the days prior to the examination days

1-day mean

120

121.5

47.8

72.0

82.0

118.0

146.0

186.0

120

119.5

51.2

64.0

82.0

118.0

142.0

188.0

0.76

2-day mean

120

121.6

38.0

74.5

93.0

125.0

146.0

173.0

120

119.3

40.3

66.0

91.0

120.0

144.0

157.0

0.64

5-day mean

120

119.5

26.9

80.7

105.6

119.6

138.0

148.8

120

118.2

25.6

81.0

96.8

119.6

136.8

144.0

0.69

8-day mean

120

119.5

23.0

84.9

101.8

119.9

141.5

146.5

120

120.2

21.5

95.6

102.8

120.4

139.0

146.3

 

0.81

  1. a Measured during the work hours of examination days using lightweight personal monitors.