Frederick MD, US: 39.42276, -77.37519
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| May 26, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | N/A | 22.0 | |
| May 26, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | N/A | 23.0 | |
| May 26, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | N/A | N/A | 18.0 | |
| May 26, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | N/A | 22.0 | |
| May 26, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | N/A | 22.0 | |
| May 25, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | N/A | N/A | 33.0 | |
| May 25, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | N/A | 35.0 | |
| May 25, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | N/A | 41.0 | |
| May 25, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 56.0 ppb (43) | N/A | N/A | N/A | 43.0 | |
| May 25, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 60.0 ppb (46) | N/A | N/A | N/A | 46.0 | |
| May 25, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 58.0 ppb (45) | N/A | N/A | N/A | 45.0 | |
| May 25, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 56.0 ppb (43) | N/A | N/A | N/A | 43.0 | |
| May 25, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 52.0 ppb (40) | N/A | N/A | N/A | 40.0 | |
| May 25, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | N/A | 36.0 | |
| May 25, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | N/A | N/A | 32.0 | |
| May 25, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | N/A | 30.0 | |
| May 25, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | N/A | 27.0 | |
| May 25, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | N/A | 21.0 | |
| May 25, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | N/A | N/A | 12.0 | |
| May 25, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | N/A | 10.0 | |
| May 25, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | N/A | 10.0 | |
| May 25, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | N/A | N/A | 9.0 | |
| May 25, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | N/A | 11.0 | |
| May 25, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | N/A | N/A | 12.0 | |
| May 25, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | N/A | 10.0 | |
| May 25, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | N/A | 11.0 | |
| May 25, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | N/A | N/A | 12.0 | |
| May 25, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | N/A | 25.0 | |
| May 25, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | N/A | N/A | 33.0 | |
| May 24, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 46.0 ppb (35) | N/A | N/A | N/A | 35.0 | |
| May 24, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | N/A | 41.0 | |
| May 24, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | N/A | N/A | 42.0 | |
| May 24, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | N/A | N/A | 42.0 | |
| May 24, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | N/A | 41.0 | |
| May 24, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | N/A | 41.0 | |
| May 24, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | N/A | 41.0 | |
| May 24, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 52.0 ppb (40) | N/A | N/A | N/A | 40.0 | |
| May 24, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | N/A | N/A | 39.0 | |
| May 24, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | N/A | N/A | 38.0 | |
| May 24, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | N/A | 36.0 | |
| May 24, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 46.0 ppb (35) | N/A | N/A | N/A | 35.0 | |
| May 24, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | N/A | N/A | 37.0 | |
| May 24, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | N/A | N/A | 38.0 | |
| May 24, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | N/A | N/A | 38.0 | |
| May 24, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | N/A | 35.0 | |
| May 24, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | N/A | N/A | 33.0 | |
| May 24, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | N/A | 30.0 | |
| May 24, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | N/A | 27.0 | |
| May 24, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | N/A | 20.0 | |
| May 24, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | N/A | 18.0 | |
| May 24, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | N/A | 19.0 | |
| May 24, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | N/A | 24.0 | |
| May 24, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | N/A | 27.0 | |
| May 23, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | N/A | 30.0 | |
| May 23, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | N/A | 29.0 | |
| May 23, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | N/A | 31.0 | |
| May 23, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | N/A | 30.0 | |
| May 23, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | N/A | N/A | 32.0 | |
| May 23, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 52.0 ppb (40) | N/A | N/A | N/A | 40.0 | |
| May 23, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | N/A | N/A | 42.0 | |
| May 23, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | N/A | 36.0 | |
| May 23, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | N/A | 31.0 | |
| May 23, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | N/A | 26.0 | |
| May 23, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | N/A | 25.0 | |
| May 23, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | N/A | 23.0 | |
| May 23, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | N/A | 23.0 | |
| May 23, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | N/A | 24.0 | |
| May 23, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | N/A | 22.0 | |
| May 23, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | N/A | 23.0 | |
| May 21, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | N/A | 28.0 | |
| May 21, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | N/A | 25.0 | |
| May 21, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | N/A | 23.0 | |
| May 21, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | N/A | 23.0 | |
| May 21, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | N/A | 25.0 | |
| May 21, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | N/A | 26.0 | |
| May 21, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | N/A | 25.0 | |
| May 21, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | N/A | 25.0 | |
| May 21, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | N/A | 27.0 | |
| May 21, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | N/A | 28.0 | |
| May 21, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | N/A | 28.0 | |
| May 21, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | N/A | N/A | 32.0 | |
| May 21, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | N/A | N/A | 32.0 | |
| May 21, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 46.0 ppb (35) | N/A | N/A | N/A | 35.0 | |
| May 21, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | N/A | 36.0 | |
| May 21, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | N/A | N/A | 38.0 | |
| May 20, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | N/A | N/A | 39.0 | |
| May 20, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | N/A | N/A | 42.0 | |
| May 20, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | N/A | N/A | 42.0 | |
| May 20, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | N/A | 41.0 | |
| May 20, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | N/A | N/A | 39.0 | |
| May 20, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 52.0 ppb (40) | N/A | N/A | N/A | 40.0 | |
| May 20, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 50.0 ppb (38) | N/A | N/A | N/A | 38.0 | |
| May 20, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | N/A | N/A | 37.0 | |
| May 20, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | N/A | 36.0 | |
| May 20, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 44.0 ppb (34) | N/A | N/A | N/A | 34.0 | |
| May 20, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | N/A | 31.0 | |
| May 20, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | N/A | 28.0 | |
| May 20, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | N/A | 24.0 | |
| May 20, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | N/A | 18.0 | |
| May 20, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | N/A | 23.0 | |
| May 20, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | N/A | N/A | 32.0 | |
| May 20, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 44.0 ppb (34) | N/A | N/A | N/A | 34.0 | |
| May 20, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | N/A | 30.0 | |
| May 20, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | N/A | 26.0 | |
| May 20, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | N/A | N/A | 32.0 | |
| May 20, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | N/A | N/A | 32.0 | |
| May 20, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 50.0 ppb (38) | N/A | N/A | N/A | 38.0 | |
| May 20, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | N/A | 36.0 | |
| May 20, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | N/A | N/A | 37.0 | |
| May 19, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | N/A | N/A | 39.0 | |
| May 19, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 52.0 ppb (40) | N/A | N/A | N/A | 40.0 | |
| May 19, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | N/A | 41.0 | |
| May 19, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | N/A | 41.0 | |
| May 19, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | N/A | N/A | 42.0 | |
| May 19, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | N/A | N/A | 42.0 | |
| May 19, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 57.0 ppb (44) | N/A | N/A | N/A | 44.0 | |
| May 19, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | N/A | N/A | 39.0 | |
| May 19, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | N/A | N/A | 37.0 | |
| May 19, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | N/A | 35.0 | |
| May 19, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | N/A | N/A | 33.0 | |
| May 19, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | N/A | 22.0 | |
| May 19, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | N/A | 13.0 | |
| May 19, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | N/A | 13.0 | |
| May 19, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | N/A | N/A | 12.0 | |
| May 19, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | N/A | N/A | 12.0 | |
| May 19, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | N/A | 10.0 | |
| May 19, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | N/A | 11.0 | |
| May 19, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | N/A | N/A | 12.0 | |
| May 19, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | N/A | 14.0 | |
| May 19, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | N/A | 20.0 | |
| May 19, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | N/A | 23.0 | |
| May 19, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | N/A | 25.0 | |
| May 19, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | N/A | 35.0 | |
| May 18, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | N/A | 41.0 | |
| May 18, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | N/A | 36.0 | |
| May 18, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | N/A | N/A | 42.0 | |
| May 18, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 59.0 ppb (45) | N/A | N/A | N/A | 45.0 | |
| May 18, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 58.0 ppb (45) | N/A | N/A | N/A | 45.0 | |
| May 18, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 57.0 ppb (44) | N/A | N/A | N/A | 44.0 | |
| May 18, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | N/A | N/A | 42.0 | |
| May 18, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | N/A | N/A | 38.0 | |
| May 18, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 46.0 ppb (35) | N/A | N/A | N/A | 35.0 | |
| May 18, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | N/A | N/A | 33.0 | |
| May 18, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | N/A | 29.0 | |
| May 18, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | N/A | 22.0 | |
| May 18, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | N/A | 13.0 | |
| May 18, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | N/A | N/A | 8.0 | |
| May 18, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | N/A | 10.0 | |
| May 18, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | N/A | 11.0 | |
| May 18, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | N/A | N/A | 12.0 | |
| May 18, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | N/A | N/A | 15.0 | |
| May 18, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | N/A | 22.0 | |
| May 18, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | N/A | 26.0 | |
| May 18, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | N/A | N/A | 33.0 | |
| May 18, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | N/A | 35.0 | |
| May 18, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | N/A | 35.0 | |
| May 18, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | N/A | 36.0 | |
| May 17, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | N/A | 41.0 | |
| May 17, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | N/A | N/A | 42.0 | |
| May 17, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | N/A | N/A | 42.0 | |
| May 17, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | N/A | N/A | 42.0 | |
| May 17, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 57.0 ppb (44) | N/A | N/A | N/A | 44.0 | |
| May 17, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 57.0 ppb (44) | N/A | N/A | N/A | 44.0 | |
| May 17, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 56.0 ppb (43) | N/A | N/A | N/A | 43.0 | |
| May 17, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 50.0 ppb (38) | N/A | N/A | N/A | 38.0 | |
| May 17, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | N/A | 31.0 | |
| May 17, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | N/A | 22.0 | |
| May 17, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | N/A | 14.0 |