Table 2 Descriptive statistics of 24-h concentration levels (μg/m³) of pollutants and meteorological data in the Reykjavík capital area during the study period, 2006–2017 and Spearman’s correlation coefficients between daily concentration of pollutant and calendar days through the study period

Mean (SD)

20.5 (19.7)

12.5 (21.8)

20.7 (15.0)

2.51 (13.8)

2.98 (5.2)

5.5 (4.9)

74.9 (10.6)

Summer^a mean (SD)

17.4 (14.9)

10.8 (16.2)

16.2 (9.9)

2.48 (14.1)

2.08 (3.1)

9.1 (3.2)

74.6 (9.8)

Winter^b mean (SD)

23.6 (23.2)

14.2 (26.1)

25.3 (17.6)

2.54 (13.5)

3.90 (6.6)

1.9 (3.4)

75.1 (11.3)

Range

2.4–381

0–423

0–119

0–409

0–96

−10.5-17.7

37–97

Median

15.1

7.0

16.6

1.1

1.2

5.6

77.0

Interquartile range

11.6

8.2

15.8

1.2

2.7

7.9

15.0

Correlation coefficients

−0.17^c

−0.12^c

0.023

0.11^c

0.13^c