| Date | Value |
|---|---|
| May 3, 2020 15:24 | 0.04 ppm |
| Apr 30, 2020 18:39 | 0.06 ppm |
| Apr 29, 2020 02:22 | 0.00 ppm |
| Apr 22, 2020 23:06 | 0.02 ppm |
| Apr 20, 2020 18:02 | 0.04 ppm |
| Apr 19, 2020 15:27 | 0.04 ppm |
| Apr 17, 2020 15:22 | 0.01 ppm |
| Apr 16, 2020 20:29 | 0.03 ppm |
| Apr 14, 2020 16:17 | 0.00 ppm |
| Apr 13, 2020 19:13 | 0.01 ppm |
| Apr 12, 2020 18:16 | 0.00 ppm |