Stanton (N Dakota Hwy 31) ND, US: 47.1858, -101.4281
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| April 21, 2021, 4 p.m. | 2.8 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 45.0 ppb (42) | N/A | N/A | 5.2 μg/m3 (22) | 42.0 | |
| April 21, 2021, 3 p.m. | 3.6 ppb (4) | 2.1 ppb (2) | N/A | 2.0 ppb (2) | N/A | 3.0 ppb (5) | 38.0 ppb (36) | N/A | N/A | 5.0 μg/m3 (21) | 36.0 | |
| April 21, 2021, 2 p.m. | 3.2 ppb (4) | 2.0 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 37.0 ppb (35) | N/A | N/A | 4.5 μg/m3 (19) | 35.0 | |
| April 21, 2021, 1 p.m. | 2.9 ppb (3) | 1.8 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 36.0 ppb (34) | N/A | N/A | 4.4 μg/m3 (19) | 34.0 | |
| April 21, 2021, noon | 3.0 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 4.5 μg/m3 (19) | 33.0 | |
| April 21, 2021, 11 a.m. | 3.2 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 3.0 ppb (5) | 33.0 ppb (31) | N/A | N/A | 4.4 μg/m3 (19) | 31.0 | |
| April 21, 2021, 10 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 4.5 μg/m3 (19) | 29.0 | |
| April 21, 2021, 9 a.m. | 2.6 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 4.7 μg/m3 (20) | 28.0 | |
| April 21, 2021, 8 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 5.5 μg/m3 (23) | 28.0 | |
| April 21, 2021, 7 a.m. | 3.1 ppb (3) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 6.4 μg/m3 (27) | 29.0 | |
| April 21, 2021, 6 a.m. | 3.4 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 6.8 μg/m3 (29) | 29.0 | |
| April 21, 2021, 5 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 5.1 μg/m3 (22) | 31.0 | |
| April 21, 2021, 4 a.m. | 2.6 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 4.1 μg/m3 (18) | 33.0 | |
| April 21, 2021, 3 a.m. | 2.4 ppb (3) | 1.5 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 4.3 μg/m3 (18) | 31.0 | |
| April 21, 2021, 2 a.m. | 2.6 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 32.0 ppb (30) | N/A | N/A | 4.7 μg/m3 (20) | 30.0 | |
| April 21, 2021, 1 a.m. | 2.6 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 4.5 μg/m3 (19) | 33.0 | |
| April 21, 2021, midnight | 2.5 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 37.0 ppb (35) | N/A | N/A | 3.6 μg/m3 (16) | 35.0 | |
| April 20, 2021, 11 p.m. | 2.5 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 39.0 ppb (37) | N/A | N/A | 2.7 μg/m3 (12) | 37.0 | |
| April 20, 2021, 10 p.m. | 2.5 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 39.0 ppb (37) | N/A | N/A | 2.3 μg/m3 (10) | 37.0 | |
| April 20, 2021, 9 p.m. | 2.4 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 39.0 ppb (37) | N/A | N/A | 2.1 μg/m3 (9) | 37.0 | |
| April 20, 2021, 8 p.m. | 2.3 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 40.0 ppb (38) | N/A | N/A | 2.2 μg/m3 (10) | 38.0 | |
| April 20, 2021, 7 p.m. | 2.5 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 40.0 ppb (38) | N/A | N/A | 1.8 μg/m3 (8) | 38.0 | |
| April 20, 2021, 6 p.m. | 2.6 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 39.0 ppb (37) | N/A | N/A | 2.0 μg/m3 (9) | 37.0 | |
| April 20, 2021, 5 p.m. | 2.4 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 38.0 ppb (36) | N/A | N/A | 2.3 μg/m3 (10) | 36.0 | |
| April 20, 2021, 4 p.m. | 2.6 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 3.0 μg/m3 (13) | 33.0 | |
| April 20, 2021, 3 p.m. | 2.9 ppb (3) | 1.8 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 34.0 ppb (32) | N/A | N/A | 3.6 μg/m3 (16) | 32.0 | |
| April 20, 2021, 2 p.m. | 3.0 ppb (3) | 1.8 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 5.7 μg/m3 (24) | 28.0 | |
| April 20, 2021, 1 p.m. | 3.9 ppb (4) | 2.0 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 6.2 μg/m3 (26) | 29.0 | |
| April 20, 2021, noon | 4.1 ppb (4) | 1.7 ppb (2) | N/A | 2.0 ppb (2) | N/A | 3.0 ppb (5) | 31.0 ppb (29) | N/A | N/A | 6.7 μg/m3 (28) | 29.0 | |
| April 20, 2021, 11 a.m. | 3.7 ppb (4) | 1.8 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 6.3 μg/m3 (27) | 31.0 | |
| April 20, 2021, 10 a.m. | 3.0 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 5.6 μg/m3 (24) | 33.0 | |
| April 20, 2021, 9 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 4.3 μg/m3 (18) | 33.0 | |
| April 20, 2021, 8 a.m. | 3.2 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 3.0 ppb (5) | 36.0 ppb (34) | N/A | N/A | 4.3 μg/m3 (18) | 34.0 | |
| April 20, 2021, 7 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 5.5 μg/m3 (23) | 31.0 | |
| April 20, 2021, 6 a.m. | 2.5 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 37.0 ppb (35) | N/A | N/A | 5.7 μg/m3 (24) | 35.0 | |
| April 20, 2021, 5 a.m. | 2.3 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 40.0 ppb (38) | N/A | N/A | 4.4 μg/m3 (19) | 38.0 | |
| April 20, 2021, 4 a.m. | 2.4 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 41.0 ppb (38) | N/A | N/A | 4.4 μg/m3 (19) | 38.0 | |
| April 20, 2021, 3 a.m. | 2.5 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 42.0 ppb (39) | N/A | N/A | 4.1 μg/m3 (18) | 39.0 | |
| April 20, 2021, 2 a.m. | 2.8 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 41.0 ppb (38) | N/A | N/A | 5.9 μg/m3 (25) | 38.0 | |
| April 20, 2021, 1 a.m. | 2.4 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 40.0 ppb (38) | N/A | N/A | 6.5 μg/m3 (28) | 38.0 | |
| April 20, 2021, midnight | 2.4 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 43.0 ppb (40) | N/A | N/A | 6.2 μg/m3 (26) | 40.0 | |
| April 19, 2021, 11 p.m. | 2.4 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 42.0 ppb (39) | N/A | N/A | 5.4 μg/m3 (23) | 39.0 | |
| April 19, 2021, 10 p.m. | 2.4 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 42.0 ppb (39) | N/A | N/A | 5.1 μg/m3 (22) | 39.0 | |
| April 19, 2021, 9 p.m. | 2.4 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 42.0 ppb (39) | N/A | N/A | 5.1 μg/m3 (22) | 39.0 | |
| April 19, 2021, 8 p.m. | 2.3 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 42.0 ppb (39) | N/A | N/A | 3.8 μg/m3 (16) | 39.0 | |
| April 19, 2021, 7 p.m. | 2.2 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 41.0 ppb (38) | N/A | N/A | 3.2 μg/m3 (14) | 38.0 | |
| April 19, 2021, 6 p.m. | 2.2 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 41.0 ppb (38) | N/A | N/A | 3.1 μg/m3 (13) | 38.0 | |
| April 19, 2021, 5 p.m. | 2.2 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 41.0 ppb (38) | N/A | N/A | 3.0 μg/m3 (13) | 38.0 | |
| April 19, 2021, 4 p.m. | 2.3 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 40.0 ppb (38) | N/A | N/A | 3.0 μg/m3 (13) | 38.0 | |
| April 19, 2021, 3 p.m. | 2.3 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 38.0 ppb (36) | N/A | N/A | 3.0 μg/m3 (13) | 36.0 | |
| April 19, 2021, 2 p.m. | 2.4 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 38.0 ppb (36) | N/A | N/A | 2.8 μg/m3 (12) | 36.0 | |
| April 19, 2021, 1 p.m. | 2.4 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 38.0 ppb (36) | N/A | N/A | 2.9 μg/m3 (13) | 36.0 | |
| April 19, 2021, noon | 2.6 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 36.0 ppb (34) | N/A | N/A | 3.0 μg/m3 (13) | 34.0 | |
| April 19, 2021, 11 a.m. | 2.4 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 2.7 μg/m3 (12) | 33.0 | |
| April 19, 2021, 10 a.m. | 2.6 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 2.4 μg/m3 (10) | 28.0 | |
| April 19, 2021, 9 a.m. | 2.6 ppb (3) | 1.5 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 29.0 ppb (27) | N/A | N/A | 2.1 μg/m3 (9) | 27.0 | |
| April 19, 2021, 8 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 2.0 μg/m3 (9) | 29.0 | |
| April 19, 2021, 7 a.m. | 2.8 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 2.2 μg/m3 (10) | 31.0 | |
| April 19, 2021, 6 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 2.3 μg/m3 (10) | 33.0 | |
| April 19, 2021, 5 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 36.0 ppb (34) | N/A | N/A | 2.8 μg/m3 (12) | 34.0 | |
| April 19, 2021, 4 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 36.0 ppb (34) | N/A | N/A | 2.3 μg/m3 (10) | 34.0 | |
| April 19, 2021, 3 a.m. | 2.8 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 36.0 ppb (34) | N/A | N/A | 2.2 μg/m3 (10) | 34.0 | |
| April 19, 2021, 2 a.m. | 2.9 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 36.0 ppb (34) | N/A | N/A | 2.3 μg/m3 (10) | 34.0 | |
| April 19, 2021, 1 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 37.0 ppb (35) | N/A | N/A | 2.1 μg/m3 (9) | 35.0 | |
| April 19, 2021, midnight | 2.8 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 38.0 ppb (36) | N/A | N/A | 2.2 μg/m3 (10) | 36.0 | |
| April 18, 2021, 11 p.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 39.0 ppb (37) | N/A | N/A | 2.0 μg/m3 (9) | 37.0 | |
| April 18, 2021, 10 p.m. | 2.7 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 38.0 ppb (36) | N/A | N/A | 2.1 μg/m3 (9) | 36.0 | |
| April 18, 2021, 9 p.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 37.0 ppb (35) | N/A | N/A | 2.5 μg/m3 (11) | 35.0 | |
| April 18, 2021, 8 p.m. | 2.7 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 37.0 ppb (35) | N/A | N/A | 2.6 μg/m3 (11) | 35.0 | |
| April 18, 2021, 7 p.m. | 2.9 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 36.0 ppb (34) | N/A | N/A | 2.9 μg/m3 (13) | 34.0 | |
| April 18, 2021, 6 p.m. | 2.8 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 34.0 ppb (32) | N/A | N/A | 2.6 μg/m3 (11) | 32.0 | |
| April 18, 2021, 5 p.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 32.0 ppb (30) | N/A | N/A | 1.5 μg/m3 (7) | 30.0 | |
| April 18, 2021, 4 p.m. | 2.8 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 0.9 μg/m3 (4) | 33.0 | |
| April 18, 2021, 3 p.m. | 6.5 ppb (7) | 2.6 ppb (3) | N/A | 4.0 ppb (4) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 2.8 μg/m3 (12) | 29.0 | |
| April 18, 2021, 2 p.m. | 3.7 ppb (4) | 1.8 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 4.4 μg/m3 (19) | 28.0 | |
| April 18, 2021, 1 p.m. | 3.3 ppb (4) | 1.8 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 28.0 ppb (26) | N/A | N/A | 4.4 μg/m3 (19) | 26.0 | |
| April 18, 2021, noon | 3.2 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 34.0 ppb (32) | N/A | N/A | 3.7 μg/m3 (16) | 32.0 | |
| April 18, 2021, 11 a.m. | 3.0 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 3.6 μg/m3 (16) | 33.0 | |
| April 18, 2021, 10 a.m. | 3.0 ppb (3) | 1.5 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 3.5 μg/m3 (15) | 33.0 | |
| April 18, 2021, 9 a.m. | 3.2 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 36.0 ppb (34) | N/A | N/A | 3.8 μg/m3 (16) | 34.0 | |
| April 18, 2021, 8 a.m. | 3.1 ppb (3) | 1.5 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 38.0 ppb (36) | N/A | N/A | 4.0 μg/m3 (17) | 36.0 | |
| April 18, 2021, 7 a.m. | 3.2 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 36.0 ppb (34) | N/A | N/A | 3.7 μg/m3 (16) | 34.0 | |
| April 18, 2021, 6 a.m. | 3.3 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 40.0 ppb (38) | N/A | N/A | 3.8 μg/m3 (16) | 38.0 | |
| April 18, 2021, 5 a.m. | 3.3 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 43.0 ppb (40) | N/A | N/A | 3.9 μg/m3 (17) | 40.0 | |
| April 18, 2021, 4 a.m. | 3.6 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 44.0 ppb (41) | N/A | N/A | 3.9 μg/m3 (17) | 41.0 | |
| April 18, 2021, 3 a.m. | 3.7 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 45.0 ppb (42) | N/A | N/A | 4.0 μg/m3 (17) | 42.0 | |
| April 18, 2021, 2 a.m. | 4.0 ppb (4) | 1.5 ppb (2) | N/A | 2.0 ppb (2) | N/A | 3.0 ppb (5) | 47.0 ppb (44) | N/A | N/A | 4.3 μg/m3 (18) | 44.0 | |
| April 18, 2021, 1 a.m. | 3.8 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 4.0 ppb (6) | 46.0 ppb (43) | N/A | N/A | 3.9 μg/m3 (17) | 43.0 | |
| April 18, 2021, midnight | 3.2 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 49.0 ppb (46) | N/A | N/A | 3.8 μg/m3 (16) | 46.0 | |
| April 17, 2021, 11 p.m. | 3.2 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 50.0 ppb (47) | N/A | N/A | 3.7 μg/m3 (16) | 47.0 | |
| April 17, 2021, 10 p.m. | 3.5 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 51.0 ppb (48) | N/A | N/A | 3.9 μg/m3 (17) | 48.0 | |
| April 17, 2021, 9 p.m. | 3.8 ppb (4) | 1.7 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 52.0 ppb (49) | N/A | N/A | 4.2 μg/m3 (18) | 49.0 | |
| April 17, 2021, 8 p.m. | 3.9 ppb (4) | 1.7 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 50.0 ppb (47) | N/A | N/A | 3.9 μg/m3 (17) | 47.0 | |
| April 17, 2021, 7 p.m. | 4.3 ppb (5) | 1.7 ppb (2) | N/A | 3.0 ppb (3) | N/A | 2.0 ppb (3) | 48.0 ppb (45) | N/A | N/A | 4.1 μg/m3 (18) | 45.0 | |
| April 17, 2021, 6 p.m. | 6.2 ppb (6) | 2.2 ppb (3) | N/A | 4.0 ppb (4) | N/A | 5.0 ppb (8) | 46.0 ppb (43) | N/A | N/A | 6.7 μg/m3 (28) | 43.0 | |
| April 17, 2021, 5 p.m. | 7.6 ppb (8) | 2.7 ppb (3) | N/A | 5.0 ppb (5) | N/A | 7.0 ppb (10) | 43.0 ppb (40) | N/A | N/A | 6.7 μg/m3 (28) | 40.0 | |
| April 17, 2021, 4 p.m. | 5.8 ppb (6) | 2.3 ppb (3) | N/A | 4.0 ppb (4) | N/A | 6.0 ppb (9) | 42.0 ppb (39) | N/A | N/A | 5.8 μg/m3 (25) | 39.0 | |
| April 17, 2021, 3 p.m. | 4.7 ppb (5) | 2.0 ppb (2) | N/A | 3.0 ppb (3) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 6.8 μg/m3 (29) | 33.0 | |
| April 17, 2021, 2 p.m. | 4.9 ppb (5) | 2.1 ppb (2) | N/A | 3.0 ppb (3) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 7.6 μg/m3 (32) | 32.0 | |
| April 17, 2021, 1 p.m. | 4.5 ppb (5) | 1.9 ppb (2) | N/A | 3.0 ppb (3) | N/A | 2.0 ppb (3) | 32.0 ppb (30) | N/A | N/A | 7.4 μg/m3 (31) | 31.0 | |
| April 17, 2021, noon | 4.6 ppb (5) | 1.7 ppb (2) | N/A | 3.0 ppb (3) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 7.3 μg/m3 (31) | 31.0 | |
| April 17, 2021, 11 a.m. | 4.3 ppb (5) | 1.6 ppb (2) | N/A | 3.0 ppb (3) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 7.6 μg/m3 (32) | 32.0 | |
| April 17, 2021, 10 a.m. | 4.2 ppb (4) | 1.6 ppb (2) | N/A | 3.0 ppb (3) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 6.8 μg/m3 (29) | 29.0 | |
| April 17, 2021, 9 a.m. | 4.3 ppb (5) | 1.6 ppb (2) | N/A | 3.0 ppb (3) | N/A | 2.0 ppb (3) | 29.0 ppb (27) | N/A | N/A | 7.3 μg/m3 (31) | 31.0 | |
| April 17, 2021, 8 a.m. | 4.2 ppb (4) | 1.6 ppb (2) | N/A | 3.0 ppb (3) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 17, 2021, 7 a.m. | 4.1 ppb (4) | 1.6 ppb (2) | N/A | 3.0 ppb (3) | N/A | 2.0 ppb (3) | 28.0 ppb (26) | N/A | N/A | 7.5 μg/m3 (32) | 32.0 | |
| April 17, 2021, 6 a.m. | 3.6 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 7.6 μg/m3 (32) | 32.0 | |
| April 17, 2021, 5 a.m. | 3.7 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 8.3 μg/m3 (35) | 35.0 | |
| April 17, 2021, 4 a.m. | 3.4 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 32.0 ppb (30) | N/A | N/A | 6.4 μg/m3 (27) | 30.0 | |
| April 17, 2021, 3 a.m. | 3.2 ppb (4) | 1.5 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 32.0 ppb (30) | N/A | N/A | 6.3 μg/m3 (27) | 30.0 | |
| April 17, 2021, 2 a.m. | 3.2 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 32.0 ppb (30) | N/A | N/A | 6.4 μg/m3 (27) | 30.0 | |
| April 17, 2021, 1 a.m. | 3.2 ppb (4) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 6.4 μg/m3 (27) | 29.0 | |
| April 17, 2021, midnight | 3.1 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 6.1 μg/m3 (26) | 29.0 | |
| April 16, 2021, 11 p.m. | 3.1 ppb (3) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 29.0 ppb (27) | N/A | N/A | 6.5 μg/m3 (28) | 28.0 | |
| April 16, 2021, 10 p.m. | 3.1 ppb (3) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 4.3 μg/m3 (18) | 29.0 | |
| April 16, 2021, 9 p.m. | 3.1 ppb (3) | 1.6 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 4.9 μg/m3 (21) | 29.0 | |
| April 16, 2021, 8 p.m. | 3.4 ppb (4) | 1.7 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 5.9 μg/m3 (25) | 28.0 | |
| April 16, 2021, 7 p.m. | 3.3 ppb (4) | 1.7 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 5.6 μg/m3 (24) | 28.0 | |
| April 16, 2021, 6 p.m. | 3.4 ppb (4) | 1.7 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 29.0 ppb (27) | N/A | N/A | 4.8 μg/m3 (20) | 27.0 | |
| April 16, 2021, 5 p.m. | 3.5 ppb (4) | 1.7 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 5.4 μg/m3 (23) | 28.0 | |
| April 16, 2021, 4 p.m. | 3.8 ppb (4) | 1.7 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 28.0 ppb (26) | N/A | N/A | 6.8 μg/m3 (29) | 29.0 | |
| April 16, 2021, 3 p.m. | 4.0 ppb (4) | 1.7 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 28.0 ppb (26) | N/A | N/A | 9.4 μg/m3 (40) | 40.0 | |
| April 16, 2021, 2 p.m. | 4.5 ppb (5) | 1.7 ppb (2) | N/A | 3.0 ppb (3) | N/A | 2.0 ppb (3) | 26.0 ppb (25) | N/A | N/A | 10.1 μg/m3 (43) | 43.0 | |
| April 16, 2021, 1 p.m. | 5.0 ppb (5) | 1.7 ppb (2) | N/A | 3.0 ppb (3) | N/A | 2.0 ppb (3) | 25.0 ppb (24) | N/A | N/A | 11.5 μg/m3 (48) | 48.0 | |
| April 16, 2021, noon | 5.5 ppb (6) | 1.6 ppb (2) | N/A | 4.0 ppb (4) | N/A | 3.0 ppb (5) | 26.0 ppb (25) | N/A | N/A | 15.2 μg/m3 (58) | 58.0 | |
| April 16, 2021, 11 a.m. | 6.1 ppb (6) | 1.6 ppb (2) | N/A | 5.0 ppb (5) | N/A | 4.0 ppb (6) | 23.0 ppb (22) | N/A | N/A | 19.8 μg/m3 (68) | 68.0 | |
| April 16, 2021, 10 a.m. | 5.9 ppb (6) | 1.6 ppb (2) | N/A | 4.0 ppb (4) | N/A | 4.0 ppb (6) | 23.0 ppb (22) | N/A | N/A | 18.7 μg/m3 (65) | 65.0 | |
| April 16, 2021, 9 a.m. | 5.6 ppb (6) | 1.6 ppb (2) | N/A | 4.0 ppb (4) | N/A | 3.0 ppb (5) | 26.0 ppb (25) | N/A | N/A | 18.0 μg/m3 (64) | 64.0 | |
| April 16, 2021, 8 a.m. | 5.4 ppb (6) | 1.5 ppb (2) | N/A | 4.0 ppb (4) | N/A | 3.0 ppb (5) | 28.0 ppb (26) | N/A | N/A | 16.2 μg/m3 (60) | 60.0 | |
| April 16, 2021, 7 a.m. | 5.5 ppb (6) | 1.6 ppb (2) | N/A | 4.0 ppb (4) | N/A | 4.0 ppb (6) | 29.0 ppb (27) | N/A | N/A | 14.1 μg/m3 (56) | 56.0 | |
| April 16, 2021, 6 a.m. | 5.3 ppb (5) | 1.6 ppb (2) | N/A | 4.0 ppb (4) | N/A | 3.0 ppb (5) | 28.0 ppb (26) | N/A | N/A | 13.8 μg/m3 (55) | 55.0 | |
| April 16, 2021, 5 a.m. | 5.3 ppb (5) | 1.6 ppb (2) | N/A | 4.0 ppb (4) | N/A | 3.0 ppb (5) | 30.0 ppb (28) | N/A | N/A | 13.4 μg/m3 (54) | 54.0 | |
| April 16, 2021, 4 a.m. | 5.8 ppb (6) | 1.6 ppb (2) | N/A | 4.0 ppb (4) | N/A | 4.0 ppb (6) | 30.0 ppb (28) | N/A | N/A | 14.6 μg/m3 (57) | 57.0 | |
| April 16, 2021, 3 a.m. | 6.0 ppb (6) | 1.6 ppb (2) | N/A | 4.0 ppb (4) | N/A | 4.0 ppb (6) | 30.0 ppb (28) | N/A | N/A | 15.5 μg/m3 (59) | 59.0 | |
| April 16, 2021, 2 a.m. | 4.6 ppb (5) | 1.6 ppb (2) | N/A | 3.0 ppb (3) | N/A | 2.0 ppb (3) | 32.0 ppb (30) | N/A | N/A | 13.9 μg/m3 (55) | 55.0 | |
| April 16, 2021, 1 a.m. | 5.7 ppb (6) | 1.6 ppb (2) | N/A | 4.0 ppb (4) | N/A | 4.0 ppb (6) | 30.0 ppb (28) | N/A | N/A | 13.8 μg/m3 (55) | 55.0 | |
| April 16, 2021, midnight | 6.1 ppb (6) | 1.8 ppb (2) | N/A | 4.0 ppb (4) | N/A | 5.0 ppb (8) | 30.0 ppb (28) | N/A | N/A | 14.1 μg/m3 (56) | 56.0 | |
| April 15, 2021, 11 p.m. | 5.9 ppb (6) | 1.9 ppb (2) | N/A | 4.0 ppb (4) | N/A | 5.0 ppb (8) | 31.0 ppb (29) | N/A | N/A | 12.5 μg/m3 (52) | 52.0 | |
| April 15, 2021, 10 p.m. | 5.1 ppb (5) | 2.0 ppb (2) | N/A | 3.0 ppb (3) | N/A | 4.0 ppb (6) | 30.0 ppb (28) | N/A | N/A | 15.1 μg/m3 (58) | 58.0 | |
| April 15, 2021, 9 p.m. | 4.7 ppb (5) | 2.1 ppb (2) | N/A | 3.0 ppb (3) | N/A | 4.0 ppb (6) | 32.0 ppb (30) | N/A | N/A | 7.4 μg/m3 (31) | 31.0 | |
| April 15, 2021, 8 p.m. | 3.2 ppb (4) | 1.7 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 34.0 ppb (32) | N/A | N/A | 5.6 μg/m3 (24) | 32.0 | |
| April 15, 2021, 7 p.m. | 3.2 ppb (4) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 6.1 μg/m3 (26) | 31.0 | |
| April 15, 2021, 6 p.m. | 3.1 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 6.4 μg/m3 (27) | 31.0 | |
| April 15, 2021, 5 p.m. | 3.1 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 8.8 μg/m3 (37) | 37.0 | |
| April 15, 2021, 4 p.m. | 3.4 ppb (4) | 1.7 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 13.0 μg/m3 (53) | 53.0 | |
| April 15, 2021, 3 p.m. | 3.6 ppb (4) | 1.7 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 17.1 μg/m3 (62) | 62.0 | |
| April 15, 2021, 2 p.m. | 3.5 ppb (4) | 1.7 ppb (2) | N/A | 2.0 ppb (2) | N/A | 2.0 ppb (3) | 29.0 ppb (27) | N/A | N/A | 14.3 μg/m3 (56) | 56.0 | |
| April 15, 2021, 1 p.m. | 2.8 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 10.1 μg/m3 (43) | 43.0 | |
| April 15, 2021, noon | 2.6 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 9.6 μg/m3 (40) | 40.0 | |
| April 15, 2021, 11 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 30.0 ppb (28) | N/A | N/A | 10.9 μg/m3 (46) | 46.0 | |
| April 15, 2021, 10 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 9.3 μg/m3 (39) | 39.0 | |
| April 15, 2021, 9 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 32.0 ppb (30) | N/A | N/A | 7.8 μg/m3 (33) | 33.0 | |
| April 15, 2021, 8 a.m. | 2.7 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 7.7 μg/m3 (33) | 33.0 | |
| April 15, 2021, 7 a.m. | 2.6 ppb (3) | 1.5 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 34.0 ppb (32) | N/A | N/A | 6.9 μg/m3 (29) | 32.0 | |
| April 15, 2021, 6 a.m. | 2.6 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 32.0 ppb (30) | N/A | N/A | 6.4 μg/m3 (27) | 30.0 | |
| April 15, 2021, 5 a.m. | 2.5 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 32.0 ppb (30) | N/A | N/A | 7.2 μg/m3 (31) | 31.0 | |
| April 15, 2021, 4 a.m. | 2.5 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 31.0 ppb (29) | N/A | N/A | 6.5 μg/m3 (28) | 29.0 | |
| April 15, 2021, 3 a.m. | 2.4 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 32.0 ppb (30) | N/A | N/A | 5.4 μg/m3 (23) | 30.0 | |
| April 15, 2021, 2 a.m. | 2.4 ppb (3) | 1.5 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 4.0 μg/m3 (17) | 31.0 | |
| April 15, 2021, 1 a.m. | 2.4 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 3.8 μg/m3 (16) | 31.0 | |
| April 15, 2021, midnight | 2.4 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 3.6 μg/m3 (16) | 31.0 | |
| April 14, 2021, 11 p.m. | 2.3 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 33.0 ppb (31) | N/A | N/A | 3.4 μg/m3 (15) | 31.0 | |
| April 14, 2021, 10 p.m. | 2.3 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 34.0 ppb (32) | N/A | N/A | 3.2 μg/m3 (14) | 32.0 | |
| April 14, 2021, 9 p.m. | 2.4 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 3.8 μg/m3 (16) | 33.0 | |
| April 14, 2021, 8 p.m. | 2.3 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 35.0 ppb (33) | N/A | N/A | 3.4 μg/m3 (15) | 33.0 | |
| April 14, 2021, 7 p.m. | 2.2 ppb (3) | 1.6 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 36.0 ppb (34) | N/A | N/A | 3.2 μg/m3 (14) | 34.0 | |
| April 14, 2021, 6 p.m. | 2.3 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 36.0 ppb (34) | N/A | N/A | 3.1 μg/m3 (13) | 34.0 | |
| April 14, 2021, 5 p.m. | 2.2 ppb (3) | 1.7 ppb (2) | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (3) | 37.0 ppb (35) | N/A | N/A | 3.2 μg/m3 (14) | 35.0 |