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Table 2 Daily averages of exposure in the two study centers during the study waves (mean ± standard deviation)

From: Birch pollen, air pollution and their interactive effects on airway symptoms and peak expiratory flow in allergic asthma during pollen season – a panel study in Northern and Southern Sweden

 

Wave

Gothenburg

Umeå

NO x (µg/m 3 )

1 (Pollen season)

25.6 ± 14.7

9.2 ± 5.0

2 (Control season)

28.9 ± 18.3

37.5 ± 30.7

3 (Pollen season)

28.7 ± 19.0

14.6 ± 6.6

O 3 (µg/m 3 )

1 (Pollen season)

66.0 ± 12.3

63.5 ± 7.7

2 (Control season)

52.0 ± 15.7

40.0 ± 19.4

3 (Pollen season)

53.9 ± 13.8

86.8 ± 29.0

PM 2.5 (µg/m 3 )

1 (Pollen season)

9.0 ± 6.3

3.7 ± 2.7*

2 (Control season)

6.9 ± 4.3

2.1 ± 1.3

3 (Pollen season)

7.1 ± 3.9

4.6 ± 2.6

Pollen (grains per m3)

1 (Pollen season)

180 ± 254

43 ± 49

2 (Control season)

-

-

3 (Pollen season)

176 ± 221

231 ± 270

Temperature (°C)

1 (Pollen season)

9.1 ± 1.9

1.0 ± 4.2

2 (Control season)

7.5 ± 3.5

10.0 ± 3.6

3 (Pollen season)

10.8 ± 4.4

5.9 ± 5.0

Relative humidity (%)

1 (Pollen season)

72.5 ± 11.0

75.1 ± 11.2

2 (Control season)

85.5 ± 6.9

95.1 ± 6.8

3 (Pollen season)

64.7 ± 12.9

68.9 ± 12.6