| Date | Value |
|---|---|
| Oct 29, 2019 00:46 | 1600 ppm |
| Aug 26, 2019 17:30 | 1600 ppm |
| Jul 21, 2019 21:01 | 1600 ppm |
| Jul 8, 2019 01:21 | 1600 ppm |
| Jun 30, 2019 22:10 | 1600 ppm |
| Jun 30, 2019 18:13 | 1600 ppm |
| Jun 27, 2019 17:26 | 1400 ppm |
| Jun 27, 2019 00:43 | 1600 ppm |
| Jun 23, 2019 19:51 | 1600 ppm |
| Jun 23, 2019 17:44 | 1600 ppm |
| Jun 19, 2019 21:08 | 1600 ppm |