Black Hawk (Angus Lane) SD, US: 44.155636, -103.315765
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. 21, 2021, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 5.0 μg/m3 (5) | N/A | 38.0 | |
| Jan. 21, 2021, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 4.9 μg/m3 (5) | N/A | 38.0 | |
| Jan. 21, 2021, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 6.0 μg/m3 (6) | N/A | 38.0 | |
| Jan. 21, 2021, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 7.6 μg/m3 (8) | N/A | 38.0 | |
| Jan. 21, 2021, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 5.2 μg/m3 (5) | N/A | 38.0 | |
| Jan. 21, 2021, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 7.2 μg/m3 (7) | N/A | 37.0 | |
| Jan. 21, 2021, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 12.7 μg/m3 (12) | N/A | 34.0 | |
| Jan. 21, 2021, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (25) | N/A | 7.1 μg/m3 (7) | N/A | 25.0 | |
| Jan. 21, 2021, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (20) | N/A | 4.9 μg/m3 (5) | N/A | 20.0 | |
| Jan. 21, 2021, noon | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (28) | N/A | 5.7 μg/m3 (6) | N/A | 28.0 | |
| Jan. 21, 2021, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (28) | N/A | 6.8 μg/m3 (7) | N/A | 28.0 | |
| Jan. 21, 2021, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (29) | N/A | 6.0 μg/m3 (6) | N/A | 29.0 | |
| Jan. 21, 2021, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (28) | N/A | 5.2 μg/m3 (5) | N/A | 28.0 | |
| Jan. 21, 2021, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (35) | N/A | 5.8 μg/m3 (6) | N/A | 35.0 | |
| Jan. 21, 2021, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (32) | N/A | 2.3 μg/m3 (3) | N/A | 32.0 | |
| Jan. 21, 2021, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 3.4 μg/m3 (4) | N/A | 34.0 | |
| Jan. 21, 2021, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 7.1 μg/m3 (7) | N/A | 34.0 | |
| Jan. 21, 2021, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (25) | N/A | 6.9 μg/m3 (7) | N/A | 25.0 | |
| Jan. 21, 2021, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 7.4 μg/m3 (7) | N/A | 36.0 | |
| Jan. 21, 2021, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (35) | N/A | 8.8 μg/m3 (9) | N/A | 35.0 | |
| Jan. 21, 2021, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (25) | N/A | 19.4 μg/m3 (18) | N/A | 25.0 | |
| Jan. 21, 2021, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (25) | N/A | 18.8 μg/m3 (18) | N/A | 25.0 | |
| Jan. 20, 2021, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (28) | N/A | 11.1 μg/m3 (11) | N/A | 28.0 | |
| Jan. 20, 2021, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 8.7 μg/m3 (9) | N/A | 34.0 | |
| Jan. 20, 2021, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 8.4 μg/m3 (8) | N/A | 37.0 | |
| Jan. 20, 2021, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 9.0 μg/m3 (9) | N/A | 37.0 | |
| Jan. 20, 2021, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 6.7 μg/m3 (7) | N/A | 37.0 | |
| Jan. 20, 2021, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 6.5 μg/m3 (7) | N/A | 38.0 | |
| Jan. 20, 2021, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 9.0 μg/m3 (9) | N/A | 37.0 | |
| Jan. 20, 2021, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 9.0 μg/m3 (9) | N/A | 38.0 | |
| Jan. 20, 2021, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | 9.4 μg/m3 (9) | N/A | 38.0 | |
| Jan. 20, 2021, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (39) | N/A | 6.7 μg/m3 (7) | N/A | 39.0 | |
| Jan. 20, 2021, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (39) | N/A | 4.8 μg/m3 (5) | N/A | 39.0 | |
| Jan. 20, 2021, noon | N/A | N/A | N/A | N/A | N/A | N/A | 44.0 ppb (41) | N/A | 6.5 μg/m3 (7) | N/A | 41.0 | |
| Jan. 20, 2021, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 9.3 μg/m3 (9) | N/A | 37.0 | |
| Jan. 20, 2021, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | 9.0 μg/m3 (9) | N/A | 38.0 | |
| Jan. 20, 2021, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | 4.6 μg/m3 (5) | N/A | 38.0 | |
| Jan. 20, 2021, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | 2.7 μg/m3 (3) | N/A | 38.0 | |
| Jan. 20, 2021, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | 3.3 μg/m3 (4) | N/A | 38.0 | |
| Jan. 20, 2021, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (39) | N/A | 2.5 μg/m3 (3) | N/A | 39.0 | |
| Jan. 20, 2021, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (40) | N/A | 2.6 μg/m3 (3) | N/A | 40.0 | |
| Jan. 20, 2021, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (39) | N/A | 6.8 μg/m3 (7) | N/A | 39.0 | |
| Jan. 20, 2021, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 9.0 μg/m3 (9) | N/A | 38.0 | |
| Jan. 20, 2021, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 11.5 μg/m3 (11) | N/A | 36.0 | |
| Jan. 20, 2021, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (30) | N/A | 9.2 μg/m3 (9) | N/A | 30.0 | |
| Jan. 20, 2021, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (30) | N/A | 14.2 μg/m3 (14) | N/A | 30.0 | |
| Jan. 19, 2021, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (33) | N/A | 9.3 μg/m3 (9) | N/A | 33.0 | |
| Jan. 19, 2021, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 4.4 μg/m3 (5) | N/A | 34.0 | |
| Jan. 19, 2021, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 0.9 μg/m3 (1) | N/A | 36.0 | |
| Jan. 19, 2021, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 0.6 μg/m3 (1) | N/A | 36.0 | |
| Jan. 19, 2021, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 2.0 μg/m3 (2) | N/A | 37.0 | |
| Jan. 19, 2021, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 4.2 μg/m3 (4) | N/A | 36.0 | |
| Jan. 19, 2021, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (35) | N/A | 5.4 μg/m3 (5) | N/A | 35.0 | |
| Jan. 19, 2021, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (33) | N/A | 4.3 μg/m3 (4) | N/A | 33.0 | |
| Jan. 19, 2021, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (31) | N/A | 4.1 μg/m3 (4) | N/A | 31.0 | |
| Jan. 19, 2021, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (33) | N/A | 5.7 μg/m3 (6) | N/A | 33.0 | |
| Jan. 19, 2021, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 5.7 μg/m3 (6) | N/A | 36.0 | |
| Jan. 19, 2021, noon | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 1.7 μg/m3 (2) | N/A | 37.0 | |
| Jan. 19, 2021, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 0.6 μg/m3 (1) | N/A | 37.0 | |
| Jan. 19, 2021, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (35) | N/A | 2.9 μg/m3 (3) | N/A | 35.0 | |
| Jan. 19, 2021, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 2.9 μg/m3 (3) | N/A | 34.0 | |
| Jan. 19, 2021, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (32) | N/A | 1.4 μg/m3 (2) | N/A | 32.0 | |
| Jan. 19, 2021, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 1.8 μg/m3 (2) | N/A | 34.0 | |
| Jan. 19, 2021, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 1.7 μg/m3 (2) | N/A | 34.0 | |
| Jan. 19, 2021, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | -0.5 μg/m3 (0) | N/A | 36.0 | |
| Jan. 19, 2021, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | -0.5 μg/m3 (0) | N/A | 38.0 | |
| Jan. 19, 2021, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 2.3 μg/m3 (3) | N/A | 37.0 | |
| Jan. 19, 2021, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 3.2 μg/m3 (3) | N/A | 36.0 | |
| Jan. 19, 2021, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 3.2 μg/m3 (3) | N/A | 36.0 | |
| Jan. 19, 2021, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 4.6 μg/m3 (5) | N/A | 36.0 | |
| Jan. 18, 2021, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 7.8 μg/m3 (8) | N/A | 36.0 | |
| Jan. 18, 2021, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (32) | N/A | 11.7 μg/m3 (11) | N/A | 32.0 | |
| Jan. 18, 2021, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 10.0 μg/m3 (10) | N/A | 34.0 | |
| Jan. 18, 2021, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (30) | N/A | 11.9 μg/m3 (12) | N/A | 30.0 | |
| Jan. 18, 2021, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (32) | N/A | 9.0 μg/m3 (9) | N/A | 32.0 | |
| Jan. 18, 2021, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (30) | N/A | 5.3 μg/m3 (5) | N/A | 30.0 | |
| Jan. 18, 2021, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (29) | N/A | 3.6 μg/m3 (4) | N/A | 29.0 | |
| Jan. 18, 2021, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (30) | N/A | 3.2 μg/m3 (3) | N/A | 30.0 | |
| Jan. 18, 2021, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (33) | N/A | 1.3 μg/m3 (2) | N/A | 33.0 | |
| Jan. 18, 2021, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 0.5 μg/m3 (1) | N/A | 34.0 | |
| Jan. 18, 2021, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (33) | N/A | 3.2 μg/m3 (3) | N/A | 33.0 | |
| Jan. 18, 2021, noon | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (35) | N/A | 5.9 μg/m3 (6) | N/A | 35.0 | |
| Jan. 18, 2021, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (35) | N/A | 5.3 μg/m3 (5) | N/A | 35.0 | |
| Jan. 18, 2021, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 4.4 μg/m3 (5) | N/A | 34.0 | |
| Jan. 18, 2021, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 3.7 μg/m3 (4) | N/A | 34.0 | |
| Jan. 18, 2021, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (33) | N/A | 4.0 μg/m3 (4) | N/A | 33.0 | |
| Jan. 18, 2021, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 4.9 μg/m3 (5) | N/A | 36.0 | |
| Jan. 18, 2021, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 2.0 μg/m3 (2) | N/A | 34.0 | |
| Jan. 18, 2021, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (29) | N/A | 1.1 μg/m3 (2) | N/A | 29.0 | |
| Jan. 18, 2021, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (32) | N/A | 3.4 μg/m3 (4) | N/A | 32.0 | |
| Jan. 18, 2021, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (25) | N/A | 5.3 μg/m3 (5) | N/A | 25.0 | |
| Jan. 18, 2021, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (26) | N/A | 7.3 μg/m3 (7) | N/A | 26.0 | |
| Jan. 18, 2021, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (32) | N/A | 6.7 μg/m3 (7) | N/A | 32.0 | |
| Jan. 18, 2021, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 6.9 μg/m3 (7) | N/A | 36.0 | |
| Jan. 17, 2021, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 7.4 μg/m3 (7) | N/A | 34.0 | |
| Jan. 17, 2021, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (30) | N/A | 5.7 μg/m3 (6) | N/A | 30.0 | |
| Jan. 17, 2021, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 2.1 μg/m3 (2) | N/A | 34.0 | |
| Jan. 17, 2021, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (35) | N/A | -1.8 μg/m3 (0) | N/A | 35.0 | |
| Jan. 17, 2021, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | -2.7 μg/m3 (0) | N/A | 38.0 | |
| Jan. 17, 2021, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | -3.2 μg/m3 (0) | N/A | 38.0 | |
| Jan. 17, 2021, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | -3.5 μg/m3 (0) | N/A | 38.0 | |
| Jan. 17, 2021, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | 0.4 μg/m3 (1) | N/A | 38.0 | |
| Jan. 17, 2021, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 3.6 μg/m3 (4) | N/A | 38.0 | |
| Jan. 17, 2021, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | 2.2 μg/m3 (3) | N/A | 38.0 | |
| Jan. 17, 2021, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | 0.9 μg/m3 (1) | N/A | 38.0 | |
| Jan. 17, 2021, noon | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | -0.5 μg/m3 (0) | N/A | 38.0 | |
| Jan. 17, 2021, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | -1.6 μg/m3 (0) | N/A | 38.0 | |
| Jan. 17, 2021, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | -2.5 μg/m3 (0) | N/A | 37.0 | |
| Jan. 17, 2021, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | -0.9 μg/m3 (0) | N/A | 37.0 | |
| Jan. 17, 2021, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 1.4 μg/m3 (2) | N/A | 36.0 | |
| Jan. 17, 2021, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 1.5 μg/m3 (2) | N/A | 37.0 | |
| Jan. 17, 2021, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 0.5 μg/m3 (1) | N/A | 37.0 | |
| Jan. 17, 2021, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 2.2 μg/m3 (3) | N/A | 37.0 | |
| Jan. 17, 2021, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 4.4 μg/m3 (5) | N/A | 37.0 | |
| Jan. 17, 2021, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 2.5 μg/m3 (3) | N/A | 37.0 | |
| Jan. 17, 2021, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 1.4 μg/m3 (2) | N/A | 37.0 | |
| Jan. 17, 2021, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 1.1 μg/m3 (2) | N/A | 37.0 | |
| Jan. 17, 2021, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 1.9 μg/m3 (2) | N/A | 38.0 | |
| Jan. 16, 2021, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (32) | N/A | 3.1 μg/m3 (3) | N/A | 32.0 | |
| Jan. 16, 2021, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (31) | N/A | 2.1 μg/m3 (2) | N/A | 31.0 | |
| Jan. 16, 2021, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 3.1 μg/m3 (3) | N/A | 36.0 | |
| Jan. 16, 2021, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 5.7 μg/m3 (6) | N/A | 37.0 | |
| Jan. 16, 2021, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 4.1 μg/m3 (4) | N/A | 38.0 | |
| Jan. 16, 2021, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 2.6 μg/m3 (3) | N/A | 38.0 | |
| Jan. 16, 2021, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 4.0 μg/m3 (4) | N/A | 38.0 | |
| Jan. 16, 2021, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 5.7 μg/m3 (6) | N/A | 37.0 | |
| Jan. 16, 2021, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 6.7 μg/m3 (7) | N/A | 38.0 | |
| Jan. 16, 2021, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 4.6 μg/m3 (5) | N/A | 37.0 | |
| Jan. 16, 2021, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 3.5 μg/m3 (4) | N/A | 37.0 | |
| Jan. 16, 2021, noon | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 5.7 μg/m3 (6) | N/A | 37.0 | |
| Jan. 16, 2021, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 8.2 μg/m3 (8) | N/A | 36.0 | |
| Jan. 16, 2021, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (36) | N/A | 1.3 μg/m3 (2) | N/A | 36.0 | |
| Jan. 16, 2021, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (34) | N/A | 11.4 μg/m3 (11) | N/A | 34.0 | |
| Jan. 16, 2021, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (25) | N/A | 25.3 μg/m3 (24) | N/A | 25.0 | |
| Jan. 16, 2021, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (13) | N/A | 30.1 μg/m3 (28) | N/A | 28.0 | |
| Jan. 16, 2021, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (13) | N/A | 28.8 μg/m3 (27) | N/A | 27.0 | |
| Jan. 16, 2021, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (15) | N/A | 35.8 μg/m3 (34) | N/A | 34.0 | |
| Jan. 16, 2021, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (22) | N/A | 29.9 μg/m3 (28) | N/A | 28.0 | |
| Jan. 16, 2021, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (25) | N/A | 12.6 μg/m3 (12) | N/A | 25.0 | |
| Jan. 16, 2021, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (24) | N/A | 26.9 μg/m3 (25) | N/A | 25.0 | |
| Jan. 16, 2021, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 25.0 | |
| Jan. 15, 2021, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 8.0 μg/m3 (8) | N/A | 38.0 | |
| Jan. 15, 2021, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | 3.9 μg/m3 (4) | N/A | 38.0 | |
| Jan. 15, 2021, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (39) | N/A | 4.9 μg/m3 (5) | N/A | 39.0 | |
| Jan. 15, 2021, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (39) | N/A | 4.6 μg/m3 (5) | N/A | 39.0 | |
| Jan. 15, 2021, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (39) | N/A | 4.3 μg/m3 (4) | N/A | 39.0 | |
| Jan. 15, 2021, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (39) | N/A | 5.8 μg/m3 (6) | N/A | 39.0 | |
| Jan. 15, 2021, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (39) | N/A | 3.1 μg/m3 (3) | N/A | 39.0 | |
| Jan. 15, 2021, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | 2.9 μg/m3 (3) | N/A | 38.0 | |
| Jan. 15, 2021, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | 5.3 μg/m3 (5) | N/A | 38.0 | |
| Jan. 15, 2021, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | 5.3 μg/m3 (5) | N/A | 38.0 | |
| Jan. 15, 2021, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 2.4 μg/m3 (3) | N/A | 38.0 | |
| Jan. 15, 2021, noon | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (37) | N/A | 1.5 μg/m3 (2) | N/A | 37.0 | |
| Jan. 15, 2021, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 3.3 μg/m3 (4) | N/A | 38.0 | |
| Jan. 15, 2021, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (38) | N/A | 6.4 μg/m3 (6) | N/A | 38.0 | |
| Jan. 15, 2021, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 8.8 μg/m3 (9) | N/A | 38.0 | |
| Jan. 15, 2021, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 5.2 μg/m3 (5) | N/A | 38.0 | |
| Jan. 15, 2021, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 5.8 μg/m3 (6) | N/A | 38.0 | |
| Jan. 15, 2021, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 9.6 μg/m3 (9) | N/A | 38.0 | |
| Jan. 15, 2021, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 7.7 μg/m3 (8) | N/A | 38.0 | |
| Jan. 15, 2021, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 9.6 μg/m3 (9) | N/A | 38.0 | |
| Jan. 15, 2021, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 15.5 μg/m3 (15) | N/A | 38.0 | |
| Jan. 15, 2021, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (38) | N/A | 18.1 μg/m3 (17) | N/A | 38.0 | |
| Jan. 15, 2021, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 47.5 μg/m3 (44) | N/A | 44.0 | |
| Jan. 15, 2021, midnight | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 52.3 μg/m3 (49) | N/A | 49.0 | |
| Jan. 14, 2021, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 μg/m3 (34) | N/A | 34.0 | |
| Jan. 14, 2021, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 25.6 μg/m3 (24) | N/A | 24.0 | |
| Jan. 14, 2021, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 46.3 μg/m3 (43) | N/A | 43.0 |