Seattle (Little Saigon) WA, US: 47.597222, -122.319722
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. 22, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 4.0 | |
| Jan. 22, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 22, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 22, 2020, 6 a.m. | 20.1 ppb (19) | 6.6 ppb (6) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 3.0 μg/m3 (12) | 19.0 | |
| Jan. 22, 2020, 5 a.m. | 17.3 ppb (16) | 6.2 ppb (6) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 3.0 μg/m3 (12) | 16.0 | |
| Jan. 22, 2020, 4 a.m. | 22.8 ppb (21) | 8.7 ppb (8) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 3.0 μg/m3 (12) | 21.0 | |
| Jan. 22, 2020, 3 a.m. | 27.1 ppb (25) | 9.5 ppb (9) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 3.0 μg/m3 (12) | 25.0 | |
| Jan. 22, 2020, 2 a.m. | 22.1 ppb (20) | 5.5 ppb (5) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 4.0 μg/m3 (17) | 20.0 | |
| Jan. 22, 2020, 1 a.m. | 21.4 ppb (20) | 6.3 ppb (6) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 2.0 μg/m3 (8) | 20.0 | |
| Jan. 22, 2020, midnight | 29.5 ppb (27) | 10.0 ppb (9) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 2.0 μg/m3 (8) | 27.0 | |
| Jan. 21, 2020, 11 p.m. | 50.0 ppb (46) | 23.6 ppb (22) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 3.0 μg/m3 (12) | 46.0 | |
| Jan. 21, 2020, 10 p.m. | 37.4 ppb (35) | 14.8 ppb (14) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 4.0 μg/m3 (17) | 35.0 | |
| Jan. 21, 2020, 9 p.m. | 35.6 ppb (33) | 17.8 ppb (16) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 5.0 μg/m3 (21) | 33.0 | |
| Jan. 21, 2020, 8 p.m. | 56.0 ppb (52) | 28.0 ppb (26) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 4.0 μg/m3 (17) | 52.0 | |
| Jan. 21, 2020, 7 p.m. | 61.2 ppb (58) | 28.9 ppb (27) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 5.0 μg/m3 (21) | 58.0 | |
| Jan. 21, 2020, 6 p.m. | 31.9 ppb (30) | 11.0 ppb (10) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 2.0 μg/m3 (8) | 30.0 | |
| Jan. 21, 2020, 5 p.m. | 26.0 ppb (24) | 5.5 ppb (5) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 3.0 μg/m3 (12) | 24.0 | |
| Jan. 21, 2020, 4 p.m. | 37.0 ppb (34) | 11.0 ppb (10) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 5.0 μg/m3 (21) | 34.0 | |
| Jan. 21, 2020, 3 p.m. | 54.1 ppb (50) | 20.1 ppb (19) | N/A | 34.0 ppb (31) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 5.0 μg/m3 (21) | 50.0 | |
| Jan. 21, 2020, 2 p.m. | 47.0 ppb (44) | 18.1 ppb (17) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.33 ppb (4) | N/A | 7.0 μg/m3 (29) | 44.0 | |
| Jan. 21, 2020, 1 p.m. | 25.7 ppb (24) | 8.5 ppb (8) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 21, 2020, noon | 41.9 ppb (39) | 19.1 ppb (18) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 6.0 μg/m3 (25) | 39.0 | |
| Jan. 21, 2020, 11 a.m. | 28.4 ppb (26) | 5.7 ppb (5) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 26.0 | |
| Jan. 21, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 21, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.36 ppb (4) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 21, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.6 ppb (7) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 21, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.49 ppb (5) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 21, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.57 ppb (6) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Jan. 21, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.73 ppb (8) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 21, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.94 ppb (10) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| Jan. 21, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.85 ppb (9) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 21, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.81 ppb (9) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 21, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.65 ppb (7) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 21, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| Jan. 20, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.67 ppb (7) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Jan. 20, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.61 ppb (7) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 20, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.49 ppb (5) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 20, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 20, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.55 ppb (6) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| Jan. 20, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.62 ppb (7) | N/A | 16.0 μg/m3 (59) | 59.0 | |
| Jan. 20, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.57 ppb (6) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| Jan. 20, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.69 ppb (8) | N/A | 17.0 μg/m3 (61) | 61.0 | |
| Jan. 20, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.61 ppb (7) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 20, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.53 ppb (6) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 20, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.54 ppb (6) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 20, 2020, noon | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.57 ppb (6) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 20, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.42 ppb (5) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 20, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 0.0 μg/m3 (0) | 3.0 | |
| Jan. 20, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 8.0 | |
| Jan. 20, 2020, 8 a.m. | 63.3 ppb (60) | 30.2 ppb (28) | N/A | 33.0 ppb (31) | N/A | N/A | N/A | 0.55 ppb (6) | N/A | 5.0 μg/m3 (21) | 60.0 | |
| Jan. 20, 2020, 7 a.m. | 16.8 ppb (16) | 3.1 ppb (3) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 20, 2020, 6 a.m. | 44.8 ppb (41) | 20.5 ppb (19) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.55 ppb (6) | N/A | 7.0 μg/m3 (29) | 41.0 | |
| Jan. 20, 2020, 5 a.m. | 26.6 ppb (25) | 5.9 ppb (5) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 20, 2020, 4 a.m. | 64.2 ppb (61) | 35.1 ppb (32) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.78 ppb (9) | N/A | 10.0 μg/m3 (42) | 61.0 | |
| Jan. 20, 2020, 3 a.m. | 97.8 ppb (97) | 67.2 ppb (64) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.86 ppb (10) | N/A | 17.0 μg/m3 (61) | 97.0 | |
| Jan. 20, 2020, 2 a.m. | 113.7 ppb (102) | 78.1 ppb (76) | N/A | 36.0 ppb (33) | N/A | N/A | N/A | 0.62 ppb (7) | N/A | 11.0 μg/m3 (46) | 102.0 | |
| Jan. 20, 2020, 1 a.m. | 119.1 ppb (103) | 83.6 ppb (81) | N/A | 36.0 ppb (33) | N/A | N/A | N/A | 0.73 ppb (8) | N/A | 9.0 μg/m3 (38) | 103.0 | |
| Jan. 20, 2020, midnight | 98.6 ppb (97) | 66.1 ppb (63) | N/A | 33.0 ppb (31) | N/A | N/A | N/A | 0.84 ppb (9) | N/A | 11.0 μg/m3 (46) | 97.0 | |
| Jan. 19, 2020, 11 p.m. | 83.4 ppb (81) | 50.5 ppb (47) | N/A | 33.0 ppb (31) | N/A | N/A | N/A | 0.62 ppb (7) | N/A | 9.0 μg/m3 (38) | 81.0 | |
| Jan. 19, 2020, 10 p.m. | 87.6 ppb (86) | 58.7 ppb (55) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.7 ppb (8) | N/A | 10.0 μg/m3 (42) | 86.0 | |
| Jan. 19, 2020, 9 p.m. | 64.4 ppb (61) | 38.6 ppb (36) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.53 ppb (6) | N/A | 6.0 μg/m3 (25) | 61.0 | |
| Jan. 19, 2020, 8 p.m. | 21.3 ppb (20) | 8.0 ppb (7) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 2.0 μg/m3 (8) | 20.0 | |
| Jan. 19, 2020, 7 p.m. | 40.5 ppb (38) | 18.1 ppb (17) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | 5.0 μg/m3 (21) | 38.0 | |
| Jan. 19, 2020, 6 p.m. | 80.0 ppb (78) | 49.2 ppb (46) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.56 ppb (6) | N/A | 6.0 μg/m3 (25) | 78.0 | |
| Jan. 19, 2020, 5 p.m. | 58.6 ppb (55) | 34.2 ppb (32) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.6 ppb (7) | N/A | 6.0 μg/m3 (25) | 55.0 | |
| Jan. 19, 2020, 4 p.m. | 44.8 ppb (41) | 20.3 ppb (19) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.54 ppb (6) | N/A | 6.0 μg/m3 (25) | 41.0 | |
| Jan. 19, 2020, 3 p.m. | 30.0 ppb (28) | 10.4 ppb (10) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 3.0 μg/m3 (12) | 28.0 | |
| Jan. 19, 2020, 2 p.m. | 18.6 ppb (17) | 4.5 ppb (4) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | -1.0 μg/m3 (0) | 17.0 | |
| Jan. 19, 2020, 1 p.m. | 17.1 ppb (16) | 4.3 ppb (4) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | -2.0 μg/m3 (0) | 16.0 | |
| Jan. 19, 2020, noon | 17.2 ppb (16) | 3.6 ppb (3) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 1.0 μg/m3 (4) | 16.0 | |
| Jan. 19, 2020, 11 a.m. | 17.9 ppb (17) | 3.0 ppb (3) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.38 ppb (4) | N/A | 2.0 μg/m3 (8) | 17.0 | |
| Jan. 19, 2020, 10 a.m. | 20.4 ppb (19) | 5.1 ppb (5) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 2.0 μg/m3 (8) | 19.0 | |
| Jan. 19, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| Jan. 19, 2020, 8 a.m. | 8.2 ppb (8) | 0.7 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 19, 2020, 7 a.m. | 9.7 ppb (9) | 1.5 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 19, 2020, 6 a.m. | 5.4 ppb (5) | 0.5 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| Jan. 19, 2020, 5 a.m. | 4.9 ppb (5) | 0.6 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 1.0 μg/m3 (4) | 5.0 | |
| Jan. 19, 2020, 4 a.m. | 6.4 ppb (6) | 1.3 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 1.0 μg/m3 (4) | 6.0 | |
| Jan. 19, 2020, 3 a.m. | 13.3 ppb (12) | 1.9 ppb (2) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| Jan. 19, 2020, 2 a.m. | 17.3 ppb (16) | 2.3 ppb (2) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 3.0 μg/m3 (12) | 16.0 | |
| Jan. 19, 2020, 1 a.m. | 26.3 ppb (24) | 7.5 ppb (7) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | 3.0 μg/m3 (12) | 24.0 | |
| Jan. 19, 2020, midnight | 46.3 ppb (43) | 22.2 ppb (21) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.56 ppb (6) | N/A | -1.0 μg/m3 (0) | 43.0 | |
| Jan. 18, 2020, 11 p.m. | 27.4 ppb (25) | 10.4 ppb (10) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 1.0 μg/m3 (4) | 25.0 | |
| Jan. 18, 2020, 10 p.m. | 38.6 ppb (36) | 18.5 ppb (17) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.49 ppb (5) | N/A | 3.0 μg/m3 (12) | 36.0 | |
| Jan. 18, 2020, 9 p.m. | 27.2 ppb (25) | 11.0 ppb (10) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 1.0 μg/m3 (4) | 25.0 | |
| Jan. 18, 2020, 8 p.m. | 22.8 ppb (21) | 8.1 ppb (8) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 3.0 μg/m3 (12) | 21.0 | |
| Jan. 18, 2020, 7 p.m. | 39.2 ppb (36) | 19.7 ppb (18) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 5.0 μg/m3 (21) | 36.0 | |
| Jan. 18, 2020, 6 p.m. | 72.0 ppb (69) | 42.5 ppb (39) | N/A | 30.0 ppb (28) | N/A | N/A | N/A | 0.58 ppb (6) | N/A | 6.0 μg/m3 (25) | 69.0 | |
| Jan. 18, 2020, 5 p.m. | 23.5 ppb (22) | 9.3 ppb (9) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 5.0 μg/m3 (21) | 22.0 | |
| Jan. 18, 2020, 4 p.m. | 12.1 ppb (11) | 1.8 ppb (2) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 2.0 μg/m3 (8) | 11.0 | |
| Jan. 18, 2020, 3 p.m. | 9.5 ppb (9) | 1.4 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | -1.0 μg/m3 (0) | 9.0 | |
| Jan. 18, 2020, 2 p.m. | 6.6 ppb (6) | 0.5 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | -3.0 μg/m3 (0) | 6.0 | |
| Jan. 18, 2020, 1 p.m. | 6.7 ppb (6) | 0.2 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | -1.0 μg/m3 (0) | 6.0 | |
| Jan. 18, 2020, noon | 4.2 ppb (4) | 0.1 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 0.0 μg/m3 (0) | 4.0 | |
| Jan. 18, 2020, 11 a.m. | 4.6 ppb (4) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | 4.0 | |
| Jan. 18, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | N/A | |
| Jan. 18, 2020, 9 a.m. | 7.2 ppb (7) | 0.6 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| Jan. 18, 2020, 8 a.m. | 9.5 ppb (9) | 1.5 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | -2.0 μg/m3 (0) | 9.0 | |
| Jan. 18, 2020, 7 a.m. | 10.1 ppb (9) | 2.4 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 1.0 μg/m3 (4) | 9.0 | |
| Jan. 18, 2020, 6 a.m. | 11.1 ppb (10) | 1.4 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 18, 2020, 5 a.m. | 11.4 ppb (11) | 1.0 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 18, 2020, 4 a.m. | 11.9 ppb (11) | 1.8 ppb (2) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 2.0 μg/m3 (8) | 11.0 | |
| Jan. 18, 2020, 3 a.m. | 15.0 ppb (14) | 1.9 ppb (2) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 1.0 μg/m3 (4) | 14.0 | |
| Jan. 18, 2020, 2 a.m. | 17.6 ppb (16) | 2.4 ppb (2) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 2.0 μg/m3 (8) | 16.0 | |
| Jan. 18, 2020, 1 a.m. | 32.7 ppb (30) | 8.1 ppb (8) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.46 ppb (5) | N/A | 3.0 μg/m3 (12) | 30.0 | |
| Jan. 18, 2020, midnight | 51.9 ppb (48) | 20.5 ppb (19) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.56 ppb (6) | N/A | 2.0 μg/m3 (8) | 48.0 | |
| Jan. 17, 2020, 11 p.m. | 60.5 ppb (57) | 29.7 ppb (28) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | 3.0 μg/m3 (12) | 57.0 | |
| Jan. 17, 2020, 10 p.m. | 47.2 ppb (44) | 21.4 ppb (20) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 4.0 μg/m3 (17) | 44.0 | |
| Jan. 17, 2020, 9 p.m. | 46.8 ppb (43) | 22.5 ppb (21) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.42 ppb (5) | N/A | 6.0 μg/m3 (25) | 43.0 | |
| Jan. 17, 2020, 8 p.m. | 46.5 ppb (43) | 21.6 ppb (20) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 10.0 μg/m3 (42) | 43.0 | |
| Jan. 17, 2020, 7 p.m. | 51.7 ppb (48) | 32.3 ppb (30) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 5.0 μg/m3 (21) | 48.0 | |
| Jan. 17, 2020, 6 p.m. | 31.9 ppb (30) | 12.8 ppb (12) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 4.0 μg/m3 (17) | 30.0 | |
| Jan. 17, 2020, 5 p.m. | 52.2 ppb (48) | 27.2 ppb (25) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 8.0 μg/m3 (33) | 48.0 | |
| Jan. 17, 2020, 4 p.m. | 84.0 ppb (82) | 52.4 ppb (49) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.6 ppb (7) | N/A | 6.0 μg/m3 (25) | 82.0 | |
| Jan. 17, 2020, 3 p.m. | 45.3 ppb (42) | 17.5 ppb (16) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 5.0 μg/m3 (21) | 42.0 | |
| Jan. 17, 2020, 2 p.m. | 88.6 ppb (87) | 57.2 ppb (53) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.66 ppb (7) | N/A | 7.0 μg/m3 (29) | 87.0 | |
| Jan. 17, 2020, 1 p.m. | 47.3 ppb (44) | 21.3 ppb (20) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 5.0 μg/m3 (21) | 44.0 | |
| Jan. 17, 2020, noon | 22.1 ppb (20) | 4.7 ppb (4) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 17, 2020, 11 a.m. | 19.1 ppb (18) | 1.0 ppb (1) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 17, 2020, 10 a.m. | 19.6 ppb (18) | 2.0 ppb (2) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 4.0 μg/m3 (17) | 18.0 | |
| Jan. 17, 2020, 9 a.m. | 19.9 ppb (18) | 2.5 ppb (2) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 4.0 μg/m3 (17) | 18.0 | |
| Jan. 17, 2020, 8 a.m. | 13.9 ppb (13) | 0.5 ppb (0) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 17, 2020, 7 a.m. | 32.9 ppb (30) | 7.6 ppb (7) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.46 ppb (5) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 17, 2020, 6 a.m. | 28.8 ppb (27) | 9.3 ppb (9) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 17, 2020, 5 a.m. | 18.1 ppb (17) | 1.5 ppb (1) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 17, 2020, 4 a.m. | 25.2 ppb (23) | 3.2 ppb (3) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 4.0 μg/m3 (17) | 23.0 | |
| Jan. 17, 2020, 3 a.m. | 35.5 ppb (33) | 8.1 ppb (8) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 5.0 μg/m3 (21) | 33.0 | |
| Jan. 17, 2020, 2 a.m. | 78.3 ppb (76) | 37.3 ppb (35) | N/A | 41.0 ppb (38) | N/A | N/A | N/A | 0.57 ppb (6) | N/A | 6.0 μg/m3 (25) | 76.0 | |
| Jan. 17, 2020, 1 a.m. | 36.3 ppb (34) | 16.6 ppb (15) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.33 ppb (4) | N/A | 6.0 μg/m3 (25) | 34.0 | |
| Jan. 17, 2020, midnight | 60.6 ppb (57) | 29.5 ppb (27) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.51 ppb (6) | N/A | 6.0 μg/m3 (25) | 57.0 | |
| Jan. 16, 2020, 11 p.m. | 55.1 ppb (51) | 27.8 ppb (26) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.51 ppb (6) | N/A | 5.0 μg/m3 (21) | 51.0 | |
| Jan. 16, 2020, 10 p.m. | 49.1 ppb (45) | 27.3 ppb (25) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 5.0 μg/m3 (21) | 45.0 | |
| Jan. 16, 2020, 9 p.m. | 47.2 ppb (44) | 26.8 ppb (25) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 7.0 μg/m3 (29) | 44.0 | |
| Jan. 16, 2020, 8 p.m. | 57.4 ppb (54) | 32.3 ppb (30) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 9.0 μg/m3 (38) | 54.0 | |
| Jan. 16, 2020, 7 p.m. | 44.9 ppb (42) | 23.1 ppb (21) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 6.0 μg/m3 (25) | 42.0 | |
| Jan. 16, 2020, 6 p.m. | 24.3 ppb (23) | 8.6 ppb (8) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 3.0 μg/m3 (12) | 23.0 | |
| Jan. 16, 2020, 5 p.m. | 26.7 ppb (25) | 9.6 ppb (9) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 2.0 μg/m3 (8) | 25.0 | |
| Jan. 16, 2020, 4 p.m. | 12.1 ppb (11) | 1.5 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 2.0 μg/m3 (8) | 11.0 | |
| Jan. 16, 2020, 3 p.m. | 10.3 ppb (10) | 0.4 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 1.0 μg/m3 (4) | 10.0 | |
| Jan. 16, 2020, 2 p.m. | 9.5 ppb (9) | 1.0 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 2.0 μg/m3 (8) | 9.0 | |
| Jan. 16, 2020, 1 p.m. | 10.2 ppb (9) | 0.4 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| Jan. 16, 2020, noon | 12.2 ppb (11) | 1.3 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | -1.0 μg/m3 (0) | 11.0 | |
| Jan. 16, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | N/A | |
| Jan. 16, 2020, 10 a.m. | 2.9 ppb (3) | 0.2 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 16, 2020, 9 a.m. | 2.9 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 16, 2020, 8 a.m. | 2.5 ppb (2) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 1.0 μg/m3 (4) | 4.0 | |
| Jan. 16, 2020, 7 a.m. | 2.2 ppb (2) | 0.1 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| Jan. 16, 2020, 6 a.m. | 3.1 ppb (3) | 0.2 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 1.0 μg/m3 (4) | 4.0 | |
| Jan. 16, 2020, 5 a.m. | 3.5 ppb (3) | 0.3 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | -2.0 μg/m3 (0) | 3.0 | |
| Jan. 16, 2020, 4 a.m. | 3.9 ppb (4) | 0.6 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 0.0 μg/m3 (0) | 4.0 | |
| Jan. 16, 2020, 3 a.m. | 5.2 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 0.0 μg/m3 (0) | 5.0 | |
| Jan. 16, 2020, 2 a.m. | 4.9 ppb (5) | 0.8 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | -2.0 μg/m3 (0) | 5.0 | |
| Jan. 16, 2020, 1 a.m. | 7.0 ppb (6) | 1.7 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | -1.0 μg/m3 (0) | 6.0 | |
| Jan. 16, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | N/A | |
| Jan. 15, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 4.0 | |
| Jan. 15, 2020, 10 p.m. | 12.3 ppb (11) | 3.5 ppb (3) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| Jan. 15, 2020, 9 p.m. | 11.7 ppb (11) | 3.2 ppb (3) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 2.0 μg/m3 (8) | 11.0 | |
| Jan. 15, 2020, 8 p.m. | 20.0 ppb (19) | 5.8 ppb (5) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.36 ppb (4) | N/A | 1.0 μg/m3 (4) | 19.0 | |
| Jan. 15, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 4.0 | |
| Jan. 15, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 8.0 | |
| Jan. 15, 2020, 5 p.m. | 34.8 ppb (32) | 11.7 ppb (11) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | -1.0 μg/m3 (0) | 32.0 | |
| Jan. 15, 2020, 4 p.m. | 24.4 ppb (23) | 5.1 ppb (5) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.38 ppb (4) | N/A | -2.0 μg/m3 (0) | 23.0 | |
| Jan. 15, 2020, 3 p.m. | 10.6 ppb (10) | 0.9 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 2.0 μg/m3 (8) | 10.0 | |
| Jan. 15, 2020, 2 p.m. | 24.8 ppb (23) | 9.0 ppb (8) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 5.0 μg/m3 (21) | 23.0 | |
| Jan. 15, 2020, 1 p.m. | 21.8 ppb (20) | 8.5 ppb (8) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.36 ppb (4) | N/A | 4.0 μg/m3 (17) | 20.0 | |
| Jan. 15, 2020, noon | 9.9 ppb (9) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 0.0 μg/m3 (0) | 9.0 | |
| Jan. 15, 2020, 11 a.m. | 7.8 ppb (7) | 1.5 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 1.0 μg/m3 (4) | 7.0 | |
| Jan. 15, 2020, 10 a.m. | 10.1 ppb (9) | 2.4 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 2.0 μg/m3 (8) | 9.0 |