| Date | Value |
|---|---|
| Sep 25, 2020 00:02 | 0.15 ppm |
| Sep 12, 2020 20:56 | 0.05 ppm |
| Sep 4, 2020 17:05 | 0.01 ppm |
| Aug 22, 2020 17:51 | 0.15 ppm |
| Aug 14, 2020 01:52 | 0.05 ppm |
| Aug 8, 2020 20:02 | 0.00 ppm |
| Aug 3, 2020 03:14 | 0.15 ppm |
| Jul 31, 2020 01:50 | 0.05 ppm |
| Jul 29, 2020 20:11 | 0.05 ppm |
| Jul 27, 2020 19:28 | 0.00 ppm |
| Jul 18, 2020 16:58 | 0.00 ppm |