| Date | Value |
|---|---|
| Feb 19, 2021 20:04 | 0.06 ppm |
| Jan 20, 2021 00:08 | 0.05 ppm |
| Jan 16, 2021 00:00 | 0.07 ppm |
| Jan 15, 2021 14:33 | 0.12 ppm |
| Jan 13, 2021 22:50 | 0.00 ppm |
| Jan 9, 2021 14:59 | 0.00 ppm |
| Jan 3, 2021 14:45 | 0.00 ppm |
| Dec 29, 2020 18:47 | 0.25 ppm |
| Dec 19, 2020 13:47 | 0.00 ppm |
| Dec 12, 2020 14:29 | 0.25 ppm |
| Dec 7, 2020 23:25 | 0.25 ppm |
| Dec 2, 2020 23:15 | 0.50 ppm |