The ventilation rates in occupiable spaces are based on the absence of which factor?

The ventilation rates in occupiable spaces are established based on the assumption that smoking is not present. This is significant because smoking generates a range of harmful pollutants and particulates that can severely degrade indoor air quality. As a result, the presence of smokers in an environment requires a higher ventilation rate to adequately dilute and remove these harmful substances, ensuring a healthier atmosphere for occupants.

When designing ventilation systems, it is crucial to aim for air quality that meets health and comfort standards. If smoking is a factor in an environment, the ventilation requirements increase substantially to account for the additional contaminants produced. This is why the default calculations for ventilation do not consider smoking as a factor; these calculations assume a smoke-free atmosphere, aligning with efforts to promote public health and safety in indoor settings.