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. 2015 Apr 29;26(4):365–376. doi: 10.1038/jes.2015.14

Table 2. Descriptive statistics for citywide air sampling temporally-adjusted pollutant concentrations and meteorology.

  Summer 2011 Winter 2012 Summer 2012 Winter 2013
PM2.5 (mean, SD, min–max μg/m3) 14.35 (SD 3.97) (1.33–22.71) 12.76 (SD 2.97) (8.02–20.10) 13.94 (SD 2.01) (11.26–22.59) 11.26 (SD 2.01) (8.01–18.92)
BC (mean, SD, min–max abs) 1.64 (SD 0.91) (0.02–4.64) 1.34 (SD 0.53) (0.70–2.72) 1.06 (SD 0.36) (0.61–2.47) 0.93 (SD 0.35) (0.50–2.15)
Temperature (mean, min–max °F) 69.26 (61.9–78.1) 34.07 (19.8–40.7) 76.99 (70.0–82.0) 34.07 (25.1–44.5)
Relative humidity (mean, min–max %) 85.85 (75.5–98.7) 78.55 (69.5–87.7) 61.59 (46.2–79.2) 72.19 (55.3–85.2)
Wind speed (mean, min–max m/s) 1.79 (1.3–2.2) 3.20 (2.3–3.9) 2.66 (2.2–3.5) 4.21 (3.2–5.0)
Wind direction (percenatge of sessions) 33% W 50% SW 33% NW 33% NW
  33% SW 33% W 33% SW 33% W
  17% SE 17% N 17% W 33% SW
  17% NE   17% S  
Inversion presence (percentage of sessions) 50% 2 inversions 50% 3 inversions    
  33% 3 inversions 33% 4 inversions    
  17% 1 inversion 17% 2 inversions