Descriptive statistics and PM2.5 concentration for venues measured at different time points
| Venue | Day of week | Time of day | Device number | Volume (m3) | ECIG use observed | Active ECIG users | Active ECIG user density* | Mean PM2.5 (μg/m3) | Median PM2.5 (μg/m3) |
|---|---|---|---|---|---|---|---|---|---|
| ECIG event room | |||||||||
| Thursday (pre-event) | 12:58–13:28 | 1 | 4023 | Yes | 0 | 0 | 2.09 | 1.92 | |
| Thursday (pre-event) | 12:58–13:28 | 2 | 4023 | Yes | 0 | 0 | 3.19 | 3.20 | |
| Friday (event day 1) | 14:54–15:15 | 1 | 4023 | Yes | 61† | 1.52 | 786.81 | 769.60 | |
| Friday (event day 1) | 18:31–19:02 | 1 | 4023 | Yes | 86† | 2.14 | 689.88 | 703.04 | |
| Saturday (event day 2) | 14:45–15:15 | 2 | 4023 | Yes | 59† | 1.47 | 869.12 | 818.88 | |
| Saturday (event day 2) | 15:17–15:48 | 1 | 4023 | Yes | 66† | 1.64 | 556.17 | 584.64 | |
| Saturday (event day 2) | 18:00–18:30 | 1 | 4023 | Yes | 76† | 1.89 | 409.78 | 384.00 | |
| Saturday (event day 2) | 18:30–19:00 | 2 | 4023 | Yes | 76† | 1.9 | 330.97 | 311.68 | |
| Sunday (post-event) | 12:45–13:15 | 1 | 2827‡ | Yes | 0 | 0 | 12.85 | 12.80 | |
| Sunday (post-event) | 12:45–13:15 | 2 | 2827‡ | Yes | 0 | 0 | 15.82 | 15.52 | |
| Hotel restaurant 1 | |||||||||
| Thursday (pre-event) | 13:42–14:27 | 1 | 596 | Yes | 2 | 0.34 | 1.72 | 1.60 | |
| Thursday (pre-event) | 13:42–14:27 | 2 | 596 | Yes | 2 | 0.34 | 2.49 | 2.56 | |
| Friday (event day 1) | 19:14–20:07 | 1 | 596 | No | 0 | 0 | 4.92 | 4.80 | |
| Hotel restaurant 2 | |||||||||
| Friday (event day 1) | 20:21–20:51 | 1 | 942 | No | 0 | 0 | 5.89 | 5.76 | |
*Active ECIG users per 100 m3.
†Total number of individuals in the room used for active ECIG user count. Hotel restaurant 1 was located in the same building as the ECIG event room. Hotel restaurant 2 was located in a nearby hotel.
‡Room configuration changed from previous readings (divider present).
ECIG, electronic cigarette; PM2.5, particulate matter measuring <2.5 μm.