Table 1.
Summary of experimental conditions
| # | Batcha | Temperature (°C) | Relative humidity (%) | Air change rate (h−1)b | Number of Butts | Duration, h | Butts removal time, h |
|---|---|---|---|---|---|---|---|
| 1 | B | 20.3 (±0.5) | 49 (±2) | 0.47 | 27 | 44 | 25.4 |
| 2 | A | 25.0 (±0.2) | 48 (±2) | 0.47 | 18 | 123 | Endc |
| 3 | A | 25.1 (±0.2) | 48 (±1) | 0.47 | 18 | 28 | End |
| 4 | A | 25.0 (±0.3) | 48 (±1) | 0.47 | 18 | 49 | End |
| 5 | A | 25.0 (±0.2) | 48 (±1) | 0.47 | 18 | 101 | End |
| 6 | A | 25.0 (±0.1) | 48 (±1.0) | 0.47 | 27 | 27 | End |
| 7 | A | 25.0 (±0.2) | 48 (±1.0) | 0.47 | 27 | 78 | End |
| 8 | A | 25.0 (±0.1) | 48 (±1.0) | 0.47 | 36 | 27 | End |
| 9 | B | 25.0 (±0.2) | 48 (±1.0) | 0.47 | 27 | 80 | 28.4 |
| 10 | C | 30.0 (±0.2) | 47 (±1.) | 0.47 | 27 | 57 | 27.6 |
a
Batch A was purchased on 11/16/2018; batch B was purchased on 05/09/2019; batch C was purchased on 06/18/19.
b
The air change rate in this study is presented to give context on the outdoor air dilution and the local air movement over the cigarette butts.
c
“End” indicates the experiment ended when the butts were removed.