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Table 2 Hourly mean concentration of air pollutants

From: Effect of hourly concentration of particulate matter on peak expiratory flow in hospitalized children: A panel study

   Morning Noon Evening Night
   (6 a.m. through 7 a.m.) (12 p.m. through 1 p.m.) (6 p.m. through 7 p.m.) (12 a.m. through 1 a.m.)
   Mean (SD) Mean (SD) Mean (SD) Mean (SD)
PM2.5 (μg/m3) 24.0 (17.6) 26.9 (21.4) 30.0 (22.0) 25.8 (17.6)
Ox (ppb) 8.3 (6.8) 23.3 (12.3) 13.1 (9.0) 9.1 (7.6)
NO2 (ppb) 24.0 (9.4) 22.2 (16.0) 32.6 (12.8) 28.3 (12.1)
Temperature (°C) 10.1 (5.6) 15.9 (5.0) 14.2 (4.6) 11.6 (5.1)
  1. PM2.5: Particulate matter with a 50% cut-off of aerodynamic diameter ≤2.5 μm
  2. NO2: Nitrogen dioxide
  3. Ox: Photochemical oxidants