Table 1

Outdoor and indoor PM2.5 (μg/m3) by level of lit cigarettes, raw data (10 s average), Toronto Doorway Study, May to June 2008

Measurement time, minOriginal scaleLog-transformed data*
Mean (SD)MedianMinimum–maximumMean (SD)Minimum–maximum
Background9139.3 (6.6)8.00 to 1481.9 (1.2)−4.6 to 5.0
Outdoor
 0 cigarettes10379.1 (6.9)8.00 to 1551.9 (0.9)−4.6 to 5.0
 1–4 cigarettes75415.2 (17.2)11.00 to 4962.3 (1.1)−4.6 to 6.2
 5+ cigarettes11222.8 (27.8)16.03 to 4342.8 (0.8)1.1 to 6.1
Indoor
 0 cigarettes10376.5 (4.6)5.00 to 591.7 (0.6)−4.6 to 4.1
 1–4 cigarettes7546.3 (4.0)6.00 to 351.7 (0.7)−4.6 to 3.6
 5+ cigarettes1124.7 (3.0)4.02 to 201.4 (0.5)0.7 to 3.0
  • * A value of 0.01 was assigned for zero values of PM2.5.

  • Lit cigarettes meant smoking outside the entrance while measuring PM2.5 inside the entrance.

  • PM2.5, air pollutant particles with a diameter of 2.5 μm or less.