Waterpipe café parameters and ventilation rates
| Venue | Area (m2); ceiling height (m) | Volume (m3) | Ave. occupants | Ave. person/100 m2 | Ave. # active waterpipes (AAW) | CO2 indoors—outdoors (ppm) | Vo=G/(Cs-Co) ventilation rate per person | Est. (AWP) % | Ds W density (AAW/100 m3) | Ds/Vo Ventilation adj. W density |
|---|---|---|---|---|---|---|---|---|---|---|
| WP1 | 164;3.8 | 623 | 36 | 22.0 | 12 | 860−384=476 | 5000/476=11 | 33 | 1.9 | 0.18 |
| WP2 | 131;2.7 | 354 | 54 | 41 | 21 | 740−358=382 | 5000/382=13 | 39 | 5.9 | 0.45 |
| WP3 | 110;4.27 | 471 | 43 | 39 | 24 | 844−417=427 | 5000/427=12 | 56 | 5.1 | 0.44 |
| WP4 | 112;3.05 | 340 | 38 | 34 | 17 | 840−498=342 | 5000/342=15 | 45 | 5 | 0.34 |
| WP5 | 70;6.0 | 422 | 13 | 19 | 7 | 1563−430=1133 | 5000/1133=4 | 56 | 1.7 | 0.39 |
| WP6 | 227;2.9 | 804 | 16 | 5.77 | 4.2 | 648−379=269 | 5000/269=19 | 26 | 0.5 | 0.03 |
| CIG A | 5800;4.5 | 26 100 | 418 | 7.21 | 43* | 539−349=190 | 5000/187=26 | 10* | 0.16 | 0.01 |
| CIG B | 5800;4.5 | 26 100 | 528 | 9.10 | 50* | 493−325=168 | 5000/168=30 | 9* | 0.19 | 0.01 |
*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.