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Table 1 Exposure characteristics during city centre walks.

From: Beneficial cardiovascular effects of reducing exposure to particulate air pollution with a simple facemask

  Without Mask With Mask
PM2.5, μg/m3 86
(52 – 120)
140
(77 – 203)
Particle count, number/cm3 24184
(22061 – 26306)
23379
(21350 – 25409)
CO, number of peaks 6.2
(3.2 – 9.3)
3.3
(1.3 – 5.2)
NO2, number of peaks Nil Nil
SO2, number of peaks Nil Nil
Temperature, °c 29.2
(28.6 – 29.8)
28.1
(26.3 – 29.9)
Relative humidity, % 63
(58 – 68)
64
(53 – 74)
  1. Data expressed as mean (95% confidence interval).
  2. P > 0.05 compared to control (without mask) day for all, Student's paired t-test.