Seattle WA, US: 47.597222, -122.319722
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 18, 2019, 2 p.m. | 38.4 ppb (36) | 9.3 ppb (9) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 7.0 μg/m3 (29) | 36.0 | |
| March 18, 2019, 1 p.m. | 20.8 ppb (19) | 2.5 ppb (2) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 18, 2019, noon | 23.4 ppb (22) | 7.3 ppb (7) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.33 ppb (4) | N/A | 5.0 μg/m3 (21) | 22.0 | |
| March 18, 2019, 11 a.m. | 12.4 ppb (11) | 1.3 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 18, 2019, 10 a.m. | 10.4 ppb (10) | 0.5 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 18, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 18, 2019, 8 a.m. | 17.0 ppb (16) | 1.1 ppb (1) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 18, 2019, 7 a.m. | 20.7 ppb (19) | 3.3 ppb (3) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 18, 2019, 6 a.m. | 22.3 ppb (21) | 3.8 ppb (4) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 18, 2019, 5 a.m. | 28.6 ppb (26) | 6.8 ppb (6) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 18, 2019, 4 a.m. | 21.4 ppb (20) | 3.1 ppb (3) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 18, 2019, 3 a.m. | 19.5 ppb (18) | 2.0 ppb (2) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| March 18, 2019, 2 a.m. | 38.6 ppb (36) | 13.8 ppb (13) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.69 ppb (8) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 18, 2019, 1 a.m. | 26.7 ppb (25) | 8.6 ppb (8) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.64 ppb (7) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 18, 2019, midnight | 28.9 ppb (27) | 12.8 ppb (12) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.61 ppb (7) | N/A | 6.0 μg/m3 (25) | 27.0 | |
| March 17, 2019, 11 p.m. | 22.0 ppb (20) | 9.7 ppb (9) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.53 ppb (6) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 17, 2019, 10 p.m. | 28.0 ppb (26) | 14.2 ppb (13) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.56 ppb (6) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 17, 2019, 9 p.m. | 25.4 ppb (24) | 12.8 ppb (12) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 17, 2019, 8 p.m. | 19.0 ppb (18) | 9.4 ppb (9) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.38 ppb (4) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 17, 2019, 7 p.m. | 23.1 ppb (21) | 11.8 ppb (11) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 17, 2019, 6 p.m. | 27.8 ppb (26) | 14.5 ppb (13) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 6.0 μg/m3 (25) | 26.0 | |
| March 17, 2019, 5 p.m. | 13.4 ppb (12) | 5.2 ppb (5) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 17, 2019, 4 p.m. | 13.3 ppb (12) | 4.8 ppb (4) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 17, 2019, 3 p.m. | 15.2 ppb (14) | 3.6 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 17, 2019, 2 p.m. | 20.2 ppb (19) | 3.4 ppb (3) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 17, 2019, 1 p.m. | 17.2 ppb (16) | 2.1 ppb (2) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 17, 2019, noon | 15.4 ppb (14) | 3.2 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| March 17, 2019, 11 a.m. | 15.7 ppb (15) | 1.3 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 17, 2019, 10 a.m. | 16.1 ppb (15) | 1.4 ppb (1) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 17, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 17, 2019, 8 a.m. | 20.0 ppb (19) | 2.4 ppb (2) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| March 17, 2019, 7 a.m. | 23.6 ppb (22) | 4.2 ppb (4) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | 17.0 μg/m3 (61) | 61.0 | |
| March 17, 2019, 6 a.m. | 26.8 ppb (25) | 4.9 ppb (5) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.57 ppb (6) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| March 17, 2019, 5 a.m. | 36.9 ppb (34) | 11.7 ppb (11) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.69 ppb (8) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 17, 2019, 4 a.m. | 60.9 ppb (57) | 28.0 ppb (26) | N/A | 33.0 ppb (31) | N/A | N/A | N/A | 0.83 ppb (9) | N/A | 17.0 μg/m3 (61) | 61.0 | |
| March 17, 2019, 3 a.m. | 38.4 ppb (36) | 12.2 ppb (11) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.61 ppb (7) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 17, 2019, 2 a.m. | 24.3 ppb (23) | 3.0 ppb (3) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 17, 2019, 1 a.m. | 21.1 ppb (20) | 3.9 ppb (4) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.36 ppb (4) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 17, 2019, midnight | 44.1 ppb (41) | 18.2 ppb (17) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.69 ppb (8) | N/A | 8.0 μg/m3 (33) | 41.0 | |
| March 16, 2019, 11 p.m. | 47.3 ppb (44) | 22.1 ppb (20) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.6 ppb (7) | N/A | 30.0 μg/m3 (88) | 88.0 | |
| March 16, 2019, 10 p.m. | 46.3 ppb (43) | 26.2 ppb (24) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.61 ppb (7) | N/A | 8.0 μg/m3 (33) | 43.0 | |
| March 16, 2019, 9 p.m. | 39.6 ppb (37) | 21.4 ppb (20) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.61 ppb (7) | N/A | 7.0 μg/m3 (29) | 37.0 | |
| March 16, 2019, 8 p.m. | 63.0 ppb (60) | 38.7 ppb (36) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.63 ppb (7) | N/A | 13.0 μg/m3 (52) | 60.0 | |
| March 16, 2019, 7 p.m. | 69.0 ppb (66) | 44.4 ppb (41) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.59 ppb (7) | N/A | 14.0 μg/m3 (54) | 66.0 | |
| March 16, 2019, 6 p.m. | 67.2 ppb (64) | 43.6 ppb (40) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.72 ppb (8) | N/A | 14.0 μg/m3 (54) | 64.0 | |
| March 16, 2019, 5 p.m. | 84.8 ppb (83) | 55.4 ppb (51) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.76 ppb (8) | N/A | 11.0 μg/m3 (46) | 83.0 | |
| March 16, 2019, 4 p.m. | 65.2 ppb (62) | 41.1 ppb (38) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.64 ppb (7) | N/A | 11.0 μg/m3 (46) | 62.0 | |
| March 16, 2019, 3 p.m. | 21.7 ppb (20) | 5.9 ppb (5) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| March 16, 2019, 2 p.m. | 19.0 ppb (18) | 2.4 ppb (2) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 16, 2019, 1 p.m. | 21.0 ppb (19) | 3.0 ppb (3) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 16, 2019, noon | 22.1 ppb (20) | 2.6 ppb (2) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.36 ppb (4) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 16, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 16, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 16, 2019, 9 a.m. | 16.9 ppb (16) | 2.4 ppb (2) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 16, 2019, 8 a.m. | 16.3 ppb (15) | 1.6 ppb (1) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| March 16, 2019, 7 a.m. | 28.8 ppb (27) | 8.1 ppb (8) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.54 ppb (6) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 16, 2019, 6 a.m. | 23.6 ppb (22) | 3.0 ppb (3) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.46 ppb (5) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 16, 2019, 5 a.m. | 28.1 ppb (26) | 8.4 ppb (8) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.53 ppb (6) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 16, 2019, 4 a.m. | 21.4 ppb (20) | 3.1 ppb (3) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.49 ppb (5) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 16, 2019, 3 a.m. | 20.1 ppb (19) | 2.7 ppb (3) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.42 ppb (5) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 16, 2019, 2 a.m. | 13.7 ppb (13) | 1.7 ppb (2) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 16, 2019, 1 a.m. | 22.8 ppb (21) | 7.3 ppb (7) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.46 ppb (5) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 16, 2019, midnight | 32.4 ppb (30) | 13.1 ppb (12) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.53 ppb (6) | N/A | 5.0 μg/m3 (21) | 30.0 | |
| March 15, 2019, 11 p.m. | 48.1 ppb (45) | 22.5 ppb (21) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.56 ppb (6) | N/A | 7.0 μg/m3 (29) | 45.0 | |
| March 15, 2019, 10 p.m. | 58.2 ppb (54) | 30.1 ppb (28) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.71 ppb (8) | N/A | 9.0 μg/m3 (38) | 54.0 | |
| March 15, 2019, 9 p.m. | 93.7 ppb (92) | 56.6 ppb (53) | N/A | 37.0 ppb (34) | N/A | N/A | N/A | 0.67 ppb (7) | N/A | 9.0 μg/m3 (38) | 92.0 | |
| March 15, 2019, 8 p.m. | 84.2 ppb (82) | 54.3 ppb (50) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.66 ppb (7) | N/A | 8.0 μg/m3 (33) | 82.0 | |
| March 15, 2019, 7 p.m. | 80.4 ppb (78) | 56.0 ppb (52) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.66 ppb (7) | N/A | 18.0 μg/m3 (63) | 78.0 | |
| March 15, 2019, 6 p.m. | 138.4 ppb (107) | 104.1 ppb (101) | N/A | 34.0 ppb (31) | N/A | N/A | N/A | 0.72 ppb (8) | N/A | 17.0 μg/m3 (61) | 107.0 | |
| March 15, 2019, 5 p.m. | 120.6 ppb (104) | 90.0 ppb (88) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.65 ppb (7) | N/A | 14.0 μg/m3 (54) | 104.0 | |
| March 15, 2019, 4 p.m. | 65.0 ppb (62) | 43.0 ppb (40) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.59 ppb (7) | N/A | 13.0 μg/m3 (52) | 62.0 | |
| March 15, 2019, 3 p.m. | 138.3 ppb (107) | 102.3 ppb (100) | N/A | 36.0 ppb (33) | N/A | N/A | N/A | 0.85 ppb (9) | N/A | 13.0 μg/m3 (52) | 107.0 | |
| March 15, 2019, 2 p.m. | 68.1 ppb (65) | 41.8 ppb (39) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.66 ppb (7) | N/A | 10.0 μg/m3 (42) | 65.0 | |
| March 15, 2019, 1 p.m. | 47.2 ppb (44) | 20.4 ppb (19) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 7.0 μg/m3 (29) | 44.0 | |
| March 15, 2019, noon | 41.7 ppb (39) | 17.6 ppb (16) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 9.0 μg/m3 (38) | 39.0 | |
| March 15, 2019, 11 a.m. | 25.3 ppb (23) | 6.6 ppb (6) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 15, 2019, 10 a.m. | 20.6 ppb (19) | 3.5 ppb (3) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 15, 2019, 9 a.m. | 30.3 ppb (28) | 5.1 ppb (5) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 15, 2019, 8 a.m. | 33.1 ppb (31) | 4.2 ppb (4) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 15, 2019, 7 a.m. | 40.9 ppb (38) | 12.0 ppb (11) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.54 ppb (6) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 15, 2019, 6 a.m. | 43.1 ppb (40) | 16.3 ppb (15) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 6.0 μg/m3 (25) | 40.0 | |
| March 15, 2019, 5 a.m. | 41.9 ppb (39) | 17.0 ppb (16) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.54 ppb (6) | N/A | 9.0 μg/m3 (38) | 39.0 | |
| March 15, 2019, 4 a.m. | 50.9 ppb (47) | 23.7 ppb (22) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.61 ppb (7) | N/A | 9.0 μg/m3 (38) | 47.0 | |
| March 15, 2019, 3 a.m. | 58.0 ppb (54) | 26.7 ppb (25) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.69 ppb (8) | N/A | 6.0 μg/m3 (25) | 54.0 | |
| March 15, 2019, 2 a.m. | 55.8 ppb (52) | 28.6 ppb (26) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.64 ppb (7) | N/A | 8.0 μg/m3 (33) | 52.0 | |
| March 15, 2019, 1 a.m. | 40.4 ppb (37) | 19.5 ppb (18) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.62 ppb (7) | N/A | 8.0 μg/m3 (33) | 37.0 | |
| March 15, 2019, midnight | 43.3 ppb (40) | 23.1 ppb (21) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.58 ppb (6) | N/A | 6.0 μg/m3 (25) | 40.0 | |
| March 14, 2019, 11 p.m. | 44.2 ppb (41) | 24.5 ppb (23) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.58 ppb (6) | N/A | 5.0 μg/m3 (21) | 41.0 | |
| March 14, 2019, 10 p.m. | 41.0 ppb (38) | 22.5 ppb (21) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.58 ppb (6) | N/A | 5.0 μg/m3 (21) | 38.0 | |
| March 14, 2019, 9 p.m. | 45.1 ppb (42) | 26.2 ppb (24) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.7 ppb (8) | N/A | 5.0 μg/m3 (21) | 42.0 | |
| March 14, 2019, 8 p.m. | 71.3 ppb (68) | 45.2 ppb (42) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.72 ppb (8) | N/A | 7.0 μg/m3 (29) | 68.0 | |
| March 14, 2019, 7 p.m. | 90.0 ppb (88) | 62.3 ppb (59) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.73 ppb (8) | N/A | 9.0 μg/m3 (38) | 88.0 | |
| March 14, 2019, 6 p.m. | 73.4 ppb (71) | 49.9 ppb (46) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.62 ppb (7) | N/A | 7.0 μg/m3 (29) | 71.0 | |
| March 14, 2019, 5 p.m. | 38.9 ppb (36) | 19.7 ppb (18) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.47 ppb (5) | N/A | 7.0 μg/m3 (29) | 36.0 | |
| March 14, 2019, 4 p.m. | 57.7 ppb (54) | 32.6 ppb (30) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.62 ppb (7) | N/A | 8.0 μg/m3 (33) | 54.0 | |
| March 14, 2019, 3 p.m. | 56.9 ppb (53) | 31.3 ppb (29) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.61 ppb (7) | N/A | 11.0 μg/m3 (46) | 53.0 | |
| March 14, 2019, 2 p.m. | 54.1 ppb (50) | 27.1 ppb (25) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 9.0 μg/m3 (38) | 50.0 | |
| March 14, 2019, 1 p.m. | 41.6 ppb (39) | 16.5 ppb (15) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 9.0 μg/m3 (38) | 39.0 | |
| March 14, 2019, noon | 33.7 ppb (31) | 11.2 ppb (10) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 3.0 μg/m3 (12) | 31.0 | |
| March 14, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 14, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 14, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 14, 2019, 8 a.m. | 8.9 ppb (8) | 1.0 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 14, 2019, 7 a.m. | 15.7 ppb (15) | 2.1 ppb (2) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.33 ppb (4) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 14, 2019, 6 a.m. | 27.9 ppb (26) | 5.8 ppb (5) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 14, 2019, 5 a.m. | 38.4 ppb (36) | 11.3 ppb (10) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.56 ppb (6) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 14, 2019, 4 a.m. | 42.7 ppb (40) | 11.7 ppb (11) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.61 ppb (7) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 14, 2019, 3 a.m. | 33.0 ppb (31) | 5.9 ppb (5) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 14, 2019, 2 a.m. | 95.1 ppb (94) | 51.3 ppb (48) | N/A | 44.0 ppb (41) | N/A | N/A | N/A | 0.74 ppb (8) | N/A | 11.0 μg/m3 (46) | 94.0 | |
| March 14, 2019, 1 a.m. | 81.0 ppb (79) | 46.4 ppb (43) | N/A | 35.0 ppb (32) | N/A | N/A | N/A | 0.75 ppb (8) | N/A | 6.0 μg/m3 (25) | 79.0 | |
| March 14, 2019, midnight | 62.9 ppb (59) | 34.9 ppb (32) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.66 ppb (7) | N/A | 6.0 μg/m3 (25) | 59.0 | |
| March 13, 2019, 11 p.m. | 55.7 ppb (52) | 30.3 ppb (28) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.61 ppb (7) | N/A | 8.0 μg/m3 (33) | 52.0 | |
| March 13, 2019, 10 p.m. | 68.4 ppb (65) | 41.2 ppb (38) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.73 ppb (8) | N/A | 11.0 μg/m3 (46) | 65.0 | |
| March 13, 2019, 9 p.m. | 78.7 ppb (76) | 50.4 ppb (47) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.82 ppb (9) | N/A | 11.0 μg/m3 (46) | 76.0 | |
| March 13, 2019, 8 p.m. | 82.2 ppb (80) | 54.2 ppb (50) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.75 ppb (8) | N/A | 12.0 μg/m3 (50) | 80.0 | |
| March 13, 2019, 7 p.m. | 99.9 ppb (99) | 66.1 ppb (63) | N/A | 34.0 ppb (31) | N/A | N/A | N/A | 0.72 ppb (8) | N/A | 14.0 μg/m3 (54) | 99.0 | |
| March 13, 2019, 6 p.m. | 83.2 ppb (81) | 54.0 ppb (50) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.64 ppb (7) | N/A | 14.0 μg/m3 (54) | 81.0 | |
| March 13, 2019, 5 p.m. | 90.2 ppb (89) | 58.8 ppb (55) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.59 ppb (7) | N/A | 13.0 μg/m3 (52) | 89.0 | |
| March 13, 2019, 4 p.m. | 100.9 ppb (100) | 65.6 ppb (62) | N/A | 35.0 ppb (32) | N/A | N/A | N/A | 0.6 ppb (7) | N/A | 14.0 μg/m3 (54) | 100.0 | |
| March 13, 2019, 3 p.m. | 32.0 ppb (30) | 11.5 ppb (11) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 7.0 μg/m3 (29) | 30.0 | |
| March 13, 2019, 2 p.m. | 40.4 ppb (37) | 14.9 ppb (14) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.42 ppb (5) | N/A | 6.0 μg/m3 (25) | 37.0 | |
| March 13, 2019, 1 p.m. | 37.9 ppb (35) | 13.4 ppb (12) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 13, 2019, noon | 66.0 ppb (63) | 39.5 ppb (37) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.57 ppb (6) | N/A | 8.0 μg/m3 (33) | 63.0 | |
| March 13, 2019, 11 a.m. | 38.1 ppb (35) | 18.6 ppb (17) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 6.0 μg/m3 (25) | 35.0 | |
| March 13, 2019, 10 a.m. | 19.7 ppb (18) | 4.4 ppb (4) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 13, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 13, 2019, 8 a.m. | 8.5 ppb (8) | 0.4 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 13, 2019, 7 a.m. | 14.1 ppb (13) | 2.3 ppb (2) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 3.0 μg/m3 (12) | 13.0 | |
| March 13, 2019, 6 a.m. | 9.8 ppb (9) | 1.0 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 13, 2019, 5 a.m. | 14.7 ppb (14) | 3.1 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 13, 2019, 4 a.m. | 15.3 ppb (14) | 1.6 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 13, 2019, 3 a.m. | 30.1 ppb (28) | 5.4 ppb (5) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 4.0 μg/m3 (17) | 28.0 | |
| March 13, 2019, 2 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 | |
| March 13, 2019, 1 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 | |
| March 13, 2019, midnight | 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 | |
| March 12, 2019, 11 p.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 | |
| March 12, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 12, 2019, 9 p.m. | 30.2 ppb (28) | 15.3 ppb (14) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 28.0 | |
| March 12, 2019, 8 p.m. | 47.0 ppb (44) | 24.1 ppb (22) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.42 ppb (5) | N/A | 6.0 μg/m3 (25) | 44.0 | |
| March 12, 2019, 7 p.m. | 85.1 ppb (83) | 57.0 ppb (53) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.6 ppb (7) | N/A | 9.0 μg/m3 (38) | 83.0 | |
| March 12, 2019, 6 p.m. | 78.7 ppb (76) | 48.3 ppb (45) | N/A | 30.0 ppb (28) | N/A | N/A | N/A | 0.49 ppb (5) | N/A | 11.0 μg/m3 (46) | 76.0 | |
| March 12, 2019, 5 p.m. | 74.5 ppb (72) | 43.4 ppb (40) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 8.0 μg/m3 (33) | 72.0 | |
| March 12, 2019, 4 p.m. | 92.0 ppb (90) | 51.6 ppb (48) | N/A | 40.0 ppb (37) | N/A | N/A | N/A | 0.46 ppb (5) | N/A | 11.0 μg/m3 (46) | 90.0 | |
| March 12, 2019, 3 p.m. | 64.4 ppb (61) | 31.5 ppb (29) | N/A | 33.0 ppb (31) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 11.0 μg/m3 (46) | 61.0 | |
| March 12, 2019, 2 p.m. | 26.3 ppb (24) | 2.9 ppb (3) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 12, 2019, 1 p.m. | 29.2 ppb (27) | 5.6 ppb (5) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 6.0 μg/m3 (25) | 27.0 | |
| March 12, 2019, noon | 40.0 ppb (37) | 16.1 ppb (15) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 7.0 μg/m3 (29) | 37.0 | |
| March 12, 2019, 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 (4) | 4.0 | |
| March 12, 2019, 10 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 | |
| March 12, 2019, 9 a.m. | 48.0 ppb (44) | 13.2 ppb (12) | N/A | 35.0 ppb (32) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 5.0 μg/m3 (21) | 44.0 | |
| March 12, 2019, 8 a.m. | 23.1 ppb (21) | 6.0 ppb (6) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 12, 2019, 7 a.m. | 19.0 ppb (18) | 3.5 ppb (3) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 12, 2019, 6 a.m. | 37.1 ppb (34) | 11.6 ppb (11) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 12, 2019, 5 a.m. | 58.4 ppb (55) | 21.5 ppb (20) | N/A | 37.0 ppb (34) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 8.0 μg/m3 (33) | 55.0 | |
| March 12, 2019, 4 a.m. | 42.6 ppb (39) | 15.1 ppb (14) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 5.0 μg/m3 (21) | 39.0 | |
| March 12, 2019, 3 a.m. | 31.6 ppb (29) | 13.4 ppb (12) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 5.0 μg/m3 (21) | 29.0 | |
| March 12, 2019, 2 a.m. | 25.8 ppb (24) | 10.8 ppb (10) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 4.0 μg/m3 (17) | 24.0 | |
| March 12, 2019, 1 a.m. | 29.7 ppb (28) | 12.2 ppb (11) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.36 ppb (4) | N/A | 5.0 μg/m3 (21) | 28.0 | |
| March 12, 2019, midnight | 29.7 ppb (28) | 13.2 ppb (12) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 5.0 μg/m3 (21) | 28.0 | |
| March 11, 2019, 11 p.m. | 60.4 ppb (57) | 29.2 ppb (27) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.62 ppb (7) | N/A | 4.0 μg/m3 (17) | 57.0 | |
| March 11, 2019, 10 p.m. | 54.4 ppb (50) | 27.5 ppb (25) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.59 ppb (7) | N/A | 5.0 μg/m3 (21) | 50.0 | |
| March 11, 2019, 9 p.m. | 71.2 ppb (68) | 40.7 ppb (38) | N/A | 30.0 ppb (28) | N/A | N/A | N/A | 0.68 ppb (8) | N/A | 9.0 μg/m3 (38) | 68.0 | |
| March 11, 2019, 8 p.m. | 53.9 ppb (50) | 25.4 ppb (24) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.55 ppb (6) | N/A | 10.0 μg/m3 (42) | 50.0 | |
| March 11, 2019, 7 p.m. | 67.7 ppb (65) | 39.8 ppb (37) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.61 ppb (7) | N/A | 7.0 μg/m3 (29) | 65.0 | |
| March 11, 2019, 6 p.m. | 88.4 ppb (87) | 47.9 ppb (44) | N/A | 40.0 ppb (37) | N/A | N/A | N/A | 0.67 ppb (7) | N/A | 8.0 μg/m3 (33) | 87.0 | |
| March 11, 2019, 5 p.m. | 93.8 ppb (92) | 51.8 ppb (48) | N/A | 42.0 ppb (39) | N/A | N/A | N/A | 0.58 ppb (6) | N/A | 8.0 μg/m3 (33) | 92.0 | |
| March 11, 2019, 4 p.m. | 108.1 ppb (101) | 68.0 ppb (65) | N/A | 40.0 ppb (37) | N/A | N/A | N/A | 0.61 ppb (7) | N/A | 12.0 μg/m3 (50) | 101.0 | |
| March 11, 2019, 3 p.m. | 134.1 ppb (106) | 91.4 ppb (90) | N/A | 43.0 ppb (40) | N/A | N/A | N/A | 0.77 ppb (9) | N/A | 14.0 μg/m3 (54) | 106.0 |