| Date | Value |
|---|---|
| May 16, 2019 19:35 | 5 ppm |
| May 13, 2019 05:00 | 12.1 ppm |
| Apr 15, 2019 07:23 | 14.1 ppm |
| Mar 18, 2019 08:23 | 13.8 ppm |
| Feb 18, 2019 08:23 | 4.2 ppm |
| Jan 27, 2019 05:00 | 5 ppm |
| Jun 4, 2018 07:45 | 0.01 ppm |
| May 10, 2018 09:09 | 1 ppm |
| Apr 29, 2018 09:32 | 1 ppm |
| Apr 20, 2018 07:57 | 0.01 ppm |
| Apr 12, 2018 14:41 | 0.00 ppm |
| Apr 8, 2018 04:03 | 0.00 ppm |
| Apr 2, 2018 07:30 | 0.00 ppm |
| Mar 21, 2018 16:10 | 5 ppm |
| Mar 21, 2018 11:18 | 4.6 ppm |