Table 4

Waterpipe café parameters and ventilation rates

VenueArea (m2); ceiling height (m)Volume (m3)Ave. occupantsAve. person/100 m2Ave. # active waterpipes (AAW)CO2 indoors—outdoors (ppm)Vo=G/(Cs-Co) ventilation rate per personEst. (AWP) %Ds W density (AAW/100 m3)Ds/Vo Ventilation adj. W density
WP1164;3.86233622.012860−384=4765000/476=11331.90.18
WP2131;2.7354544121740−358=3825000/382=13395.90.45
WP3110;4.27471433924844−417=4275000/427=12565.10.44
WP4112;3.05340383417840−498=3425000/342=154550.34
WP570;6.0422131971563−430=11335000/1133=4561.70.39
WP6227;2.9804165.774.2648−379=2695000/269=19260.50.03
CIG A5800;4.526 1004187.2143*539−349=1905000/187=2610*0.160.01
CIG B5800;4.526 1005289.1050*493−325=1685000/168=309*0.190.01
  • *Cigarettes instead of waterpipes.

  • AAW, average active waterpipes (ie, average number of active waterpipes during the period of visit); AWP, active waterpipe percentage (ie, average active waterpipes/occupants)×100 waterpipe Ds is AAW/100 m3; CIG, cigarette smoking venues; Co, the CO2 level outdoor; Cs, the CO2 level in the building; Ds, w density (ie, AAW/100 m3); G, 5000 ppm-L/s-person, (the generation rate of CO2 for a sedentary person); Vo, ventilation rate per person; Vo, G/(Cs-Co); W, waterpipe; WP, waterpipes cafe.