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Table 2 The coefficient of Spearman rank correlation between daily air pollutants and weather conditions in Lanzhou, 2014–2019

From: Acute effects of fine particulate matter (PM2.5) on hospital admissions for cardiovascular diseases in Lanzhou, China: a time-series study

  PM2.5 PM10 SO2 NO2 O38h CO Temperature Relative humidity
PM2.5 1.000 0.86* 0.67* 0.47* − 0.32* 0.72* − 0.45* − 0.08*
PM10   1.000 0.60* 0.46* − 0.14* 0.58* − 0.32* − 0.32*
SO2    1.000 0.51* − 0.38* 0.81* − 0.57* − 0.19*
NO2     1.000 0.05* 0.58* − 0.22* − 0.11*
O38h      1.000 − 0.38* 0.64* − 0.23*
CO       1.000 − 0.48* 0.01
Temperature        1.000 0.026
Relative humidity         1.000
  1. *P < 0.05