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Table 2 Comparison of ambient AP levels measured at the college and Bayview Sites

From: Exposure to air pollution near a steel plant is associated with reduced heart rate variability: a randomised crossover study

  College site Bayview site
Pollutant Mean (SD) IQR Mean(SD) IQR
CO (ppm) 0.42 (0.11) 0.20 1.24 (1.63)* 0.60
NO (ppb) 1.69 (1.2) 1.30 7.02 (4.16)* 4.90
NO2 (ppb) 4.6 (2.8) 2.90 6.89 (3.64)* 4.60
NOx (ppb) 6.29 (3.66) 2.95 13.74 (6.97)* 8.70
O3 (ppb) 32.44 (7.62) 8.90 29.66 (6.53)* 9.90
SO2 (ppb) 1.78 (2.56) 1.60 8.05 (10.58)* 14.20
PM2.5 (μg/m3) 11.67 (6.61) 8.20 13.01 (6.87)* 9.90
UFP (particles/cm3) 6960 (4261) 5560 14654 (13664)* 19648
  1. Mean values are the mean for the participant specific exposure averaged over the hours of the five days that each individual participant spent breathing ambient air at the specified site. Pollutant levels were significantly different between the College and Bayview sites (* = p < 0.05)
  2. Mean temperature at College 23.4 °C (SD 4.1 °C); mean relative humidity 56.0% (SD 15.1%)
  3. Mean temperature at Bayview 23.4 °C (SD 4.1 °C); mean relative humidity 55.9% (SD 14.3%)