| Date | Value |
|---|---|
| Sep 25, 2020 00:25 | 0.06 ppm |
| Sep 4, 2020 17:32 | 0.06 ppm |
| Aug 22, 2020 18:08 | 0.03 ppm |
| Aug 15, 2020 20:00 | 0.03 ppm |
| Aug 14, 2020 01:52 | 0.06 ppm |
| Aug 8, 2020 20:14 | 0.06 ppm |
| Jul 29, 2020 20:11 | 0.06 ppm |
| Jul 27, 2020 19:47 | 0.01 ppm |
| Jul 25, 2020 17:39 | 0.06 ppm |
| Jul 18, 2020 17:37 | 0.06 ppm |