Controlling Pollutant Pathways

Mouse over the picture above to see messages which are referenced in more detail below.

(Hot Spot over the stairs and encompassing the smoke, but not the person.)

Remember...“Pollutants may travel up stairwells and elevator shafts into occupied spaces.”
The smoker in this picture may think that smoking in the stairwell has the same effect as smoking outside. But pollutants can migrate from lower floors to upper floors through stairwells and elevator shafts.
It is not unusual, for example, to find the high concentration of soil gases such as radon not only in the basement, but also and at the op of the elevator shaft or stairwell.
Stairwells should be kept clean and free of pollution sources.