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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.