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Table 2 Description of PM2.5/PM10 and meteorological factors on the days before hospitalization

From: Effect of urban air pollution on CRP and coagulation: a study on inpatients with acute exacerbation of chronic obstructive pulmonary disease

Variable Max 75th Med 25th Min Mean ± SD
The day of consultation
 PM2.5 (μg/m3) 151.00 71.00 47.00 29.00 8.00 51.56 ± 27.89
 PM10 (μg/m3) 144.00 76.00 56.00 38.00 5.00 58.58 ± 26.37
 Temperature (°C) 34.80 27.20 17.05 8.80 1.70 18.18 ± 9.91
 Relative humidity (%) 95.00 80.00 70.00 62.00 28.00 70.85 ± 12.77
The day before consultation
 PM2.5 (μg/m3) 180.00 68.00 43.00 28.00 7.00 52.32 ± 32.93
 PM10 (μg/m3) 171.00 77.00 53.00 35.00 6.00 58.36 ± 29.36
 Temperature (°C) 33.90 26.70 18.10 10.10 − 1.00 17.78 ± 8.87
 Relative humidity (%) 98.00 81.00 73.00 64.00 28.00 71.97 ± 12.92
Two day before consultation
 PM2.5 (μg/m3) 183.00 74.00 39.00 25.00 6.00 52.05 ± 39.78
 PM10 (μg/m3) 185.00 73.00 49.00 34.00 6.00 58.56 ± 35.09
 Temperature (°C) 31.40 23.83 18.55 9.30 2.70 16.93 ± 8.14
 Relative humidity (%) 95.00 79.00 70.00 62.00 38.00 70.80 ± 12.27
  1. CRP, C-reactive protein; PM2.5, Particulate matter smaller than 2.5 µm in diameter; PM10, Particulate matter smaller than 10 µm in diameter