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. 2023 May 16;23:897. doi: 10.1186/s12889-023-15853-y

Table 3.

Exposure description and correlation matrix of air pollutants at the local authority level (N = 391 local authorities)

Pearson’s correlation coefficient
NO2 (µg/m3) SO2 (µg/m3) PM10 (µg/m3) PM2.5 (µg/m3) Mean SD Median Interquartile range
NO2 (µg/m3) 1.00 12.99 7.08 11.71 8.18
SO2 (µg/m3) 0.50 1.00 1.57 0.93 1.37 0.90
PM10 (µg/m3) 0.77 0.38 1.00 14.06 3.19 14.43 4.26
PM2.5 (µg/m3) 0.81 0.42 0.97 1.00 9.42 2.35 9.62 3.23

Strong correlations with correlation coefficient ≥ 0.70 are highlighted in bold