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Table 2 Mean Concentrations of pollutants during the 2-h walk in the two visits

From: The effects of facemasks on airway inflammation and endothelial dysfunction in healthy young adults: a double-blind, randomized, controlled crossover study

Pollutants Concentration (Min-Max, SD)
PM2.5, μg/m3 204.0 (101.0–326.6, 58.5)
CO, ppm 3.6 (1.5–6.1, 1.3)
O3, ppb 5.4 (0.1–36.1, 8.2)
SO2, ppb 37.2 (14.0–69.0, 15.1)
NO, ppb 65.5 (30.0–290.0, 51.2)
NOx, ppb 122 (46.5–563.5, 57.4)
Temperature, °C 0.3 (−2–3,1.56)
Relative Humidity,% 58.3 (38–81,16.6)
  1. PM2.5 particulate matter with aerodynamic diameter less than 2.5 μm, CO carbon monoxide, O3 ozone, SO2 sulfur dioxide, NO nitric oxide, NOx nitrogen oxides