Seattle WA, US: 47.568236, -122.308628
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 23, 2019, midnight | N/A | 0.3 ppb (0) | 5.7 ppb (5) | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 38.0 ppb (29) | 0.18 ppb (2) | N/A | 2.2 μg/m3 (9) | 29.0 | |
| March 22, 2019, 11 p.m. | N/A | 0.5 ppb (0) | 4.9 ppb (5) | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 41.0 ppb (32) | 0.18 ppb (2) | N/A | 1.0 μg/m3 (4) | 32.0 | |
| March 22, 2019, 10 p.m. | N/A | 0.6 ppb (1) | 5.7 ppb (5) | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 41.0 ppb (32) | 0.17 ppb (2) | N/A | 3.0 μg/m3 (12) | 32.0 | |
| March 22, 2019, 9 p.m. | N/A | 0.9 ppb (1) | 5.5 ppb (5) | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 40.0 ppb (31) | 0.17 ppb (2) | N/A | 3.6 μg/m3 (15) | 31.0 | |
| March 22, 2019, 8 p.m. | N/A | 1.0 ppb (1) | 4.8 ppb (4) | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 44.0 ppb (34) | 0.16 ppb (2) | N/A | -1.0 μg/m3 (0) | 34.0 | |
| March 22, 2019, 7 p.m. | N/A | 9.0 ppb (8) | 23.2 ppb (21) | 14.0 ppb (13) | N/A | 1.0 ppb (1) | 32.0 ppb (25) | 0.22 ppb (2) | N/A | 4.6 μg/m3 (19) | 25.0 | |
| March 22, 2019, 6 p.m. | N/A | 29.9 ppb (28) | 59.8 ppb (56) | 31.0 ppb (29) | N/A | 2.0 ppb (3) | 14.0 ppb (11) | 0.35 ppb (4) | N/A | 11.9 μg/m3 (50) | 56.0 | |
| March 22, 2019, 5 p.m. | N/A | 63.7 ppb (60) | 98.4 ppb (97) | 36.0 ppb (33) | N/A | 3.0 ppb (4) | 8.0 ppb (6) | 0.42 ppb (5) | N/A | 15.5 μg/m3 (57) | 97.0 | |
| March 22, 2019, 4 p.m. | N/A | 49.8 ppb (46) | 77.5 ppb (75) | 28.0 ppb (26) | N/A | N/A | 11.0 ppb (8) | 0.46 ppb (5) | N/A | 12.5 μg/m3 (51) | 75.0 | |
| March 22, 2019, 3 p.m. | N/A | 24.1 ppb (22) | 48.8 ppb (45) | 26.0 ppb (24) | N/A | N/A | 10.0 ppb (8) | 0.4 ppb (4) | N/A | 8.9 μg/m3 (37) | 45.0 | |
| March 22, 2019, 2 p.m. | N/A | 3.8 ppb (4) | 29.0 ppb (27) | 26.0 ppb (24) | N/A | N/A | 10.0 ppb (8) | 0.32 ppb (4) | N/A | 6.4 μg/m3 (27) | 27.0 | |
| March 22, 2019, 1 p.m. | N/A | 4.8 ppb (4) | 36.9 ppb (34) | 34.0 ppb (31) | N/A | 1.0 ppb (1) | 4.0 ppb (3) | 0.35 ppb (4) | N/A | 8.8 μg/m3 (37) | 37.0 | |
| March 22, 2019, noon | N/A | 19.7 ppb (18) | 56.3 ppb (52) | 38.0 ppb (35) | N/A | 1.0 ppb (1) | 2.0 ppb (2) | 0.38 ppb (4) | N/A | 8.6 μg/m3 (36) | 52.0 | |
| March 22, 2019, 11 a.m. | N/A | 0.1 ppb (0) | 6.6 ppb (6) | 7.0 ppb (6) | N/A | 1.0 ppb (1) | 30.0 ppb (23) | 0.2 ppb (2) | N/A | 3.9 μg/m3 (16) | 23.0 | |
| March 22, 2019, 10 a.m. | N/A | 0.1 ppb (0) | 7.9 ppb (7) | 7.0 ppb (6) | N/A | 1.0 ppb (1) | N/A | 0.21 ppb (2) | N/A | 4.5 μg/m3 (19) | 19.0 | |
| March 22, 2019, 9 a.m. | N/A | 0.1 ppb (0) | 10.9 ppb (10) | 11.0 ppb (10) | N/A | 1.0 ppb (1) | 28.0 ppb (22) | 0.2 ppb (2) | N/A | 3.8 μg/m3 (16) | 22.0 | |
| March 22, 2019, 8 a.m. | N/A | 0.0 ppb (0) | 4.6 ppb (4) | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 38.0 ppb (29) | N/A | N/A | 2.9 μg/m3 (12) | 29.0 | |
| March 22, 2019, 7 a.m. | N/A | 0.1 ppb (0) | 3.2 ppb (3) | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 41.0 ppb (32) | N/A | N/A | 1.5 μg/m3 (6) | 32.0 | |
| March 22, 2019, 6 a.m. | N/A | 0.0 ppb (0) | 3.2 ppb (3) | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 42.0 ppb (32) | 0.17 ppb (2) | N/A | 1.8 μg/m3 (8) | 32.0 | |
| March 22, 2019, 5 a.m. | N/A | 0.2 ppb (0) | 5.5 ppb (5) | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 39.0 ppb (30) | 0.18 ppb (2) | N/A | 1.3 μg/m3 (5) | 30.0 | |
| March 22, 2019, 4 a.m. | N/A | 0.1 ppb (0) | 4.4 ppb (4) | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 41.0 ppb (32) | 0.21 ppb (2) | N/A | 1.9 μg/m3 (8) | 32.0 | |
| March 22, 2019, 3 a.m. | N/A | 0.3 ppb (0) | 3.2 ppb (3) | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 44.0 ppb (34) | 0.17 ppb (2) | N/A | 1.6 μg/m3 (7) | 34.0 | |
| March 22, 2019, 2 a.m. | N/A | 0.1 ppb (0) | 5.1 ppb (5) | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 42.0 ppb (32) | 0.17 ppb (2) | N/A | 1.7 μg/m3 (7) | 32.0 | |
| March 22, 2019, 1 a.m. | N/A | 0.2 ppb (0) | 3.3 ppb (3) | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.16 ppb (2) | N/A | 1.1 μg/m3 (5) | 33.0 | |
| March 22, 2019, midnight | N/A | N/A | 4.2 ppb (4) | N/A | N/A | 1.0 ppb (1) | 42.0 ppb (32) | 0.17 ppb (2) | N/A | 3.6 μg/m3 (15) | 32.0 | |
| March 21, 2019, 11 p.m. | N/A | N/A | 3.2 ppb (3) | N/A | N/A | N/A | 42.0 ppb (32) | 0.17 ppb (2) | N/A | 0.1 μg/m3 (0) | 32.0 | |
| March 21, 2019, 10 p.m. | N/A | 0.6 ppb (1) | 2.7 ppb (3) | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 43.0 ppb (33) | 0.17 ppb (2) | N/A | 0.1 μg/m3 (0) | 33.0 | |
| March 21, 2019, 9 p.m. | N/A | 0.7 ppb (1) | 3.1 ppb (3) | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 45.0 ppb (35) | 0.16 ppb (2) | N/A | N/A | 35.0 | |
| March 21, 2019, 8 p.m. | N/A | 0.5 ppb (0) | 2.8 ppb (3) | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 45.0 ppb (35) | 0.16 ppb (2) | N/A | 3.7 μg/m3 (15) | 35.0 | |
| March 21, 2019, 7 p.m. | N/A | 0.8 ppb (1) | 3.8 ppb (4) | N/A | N/A | 1.0 ppb (1) | 42.0 ppb (32) | 0.16 ppb (2) | N/A | 4.3 μg/m3 (18) | 32.0 | |
| March 21, 2019, 6 p.m. | N/A | 1.0 ppb (1) | 4.6 ppb (4) | N/A | N/A | 1.0 ppb (1) | 41.0 ppb (32) | 0.2 ppb (2) | N/A | 6.2 μg/m3 (26) | 32.0 | |
| March 21, 2019, 5 p.m. | N/A | 1.4 ppb (1) | 6.3 ppb (6) | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 37.0 ppb (28) | 0.27 ppb (3) | N/A | 6.4 μg/m3 (27) | 28.0 | |
| March 21, 2019, 4 p.m. | N/A | 1.9 ppb (2) | 9.7 ppb (9) | 7.0 ppb (6) | N/A | 1.0 ppb (1) | 33.0 ppb (25) | 0.3 ppb (3) | N/A | 6.9 μg/m3 (29) | 29.0 | |
| March 21, 2019, 3 p.m. | N/A | 3.0 ppb (3) | 18.3 ppb (17) | 16.0 ppb (15) | N/A | 1.0 ppb (1) | 24.0 ppb (18) | 0.27 ppb (3) | N/A | 7.5 μg/m3 (31) | 31.0 | |
| March 21, 2019, 2 p.m. | N/A | 0.6 ppb (1) | 15.3 ppb (14) | 15.0 ppb (14) | N/A | N/A | 25.0 ppb (19) | 0.23 ppb (3) | N/A | 6.6 μg/m3 (28) | 28.0 | |
| March 21, 2019, 1 p.m. | N/A | 1.1 ppb (1) | 19.5 ppb (18) | 18.0 ppb (17) | N/A | N/A | 24.0 ppb (18) | 0.22 ppb (2) | N/A | 5.7 μg/m3 (24) | 24.0 | |
| March 21, 2019, noon | N/A | 0.2 ppb (0) | 22.0 ppb (20) | 22.0 ppb (20) | N/A | 1.0 ppb (1) | 23.0 ppb (18) | 0.24 ppb (3) | N/A | 5.6 μg/m3 (23) | 23.0 | |
| March 21, 2019, 11 a.m. | N/A | 0.1 ppb (0) | 20.8 ppb (19) | 21.0 ppb (19) | N/A | 1.0 ppb (1) | 25.0 ppb (19) | 0.22 ppb (2) | N/A | 6.6 μg/m3 (28) | 28.0 | |
| March 21, 2019, 10 a.m. | N/A | 0.1 ppb (0) | 13.9 ppb (13) | 14.0 ppb (13) | N/A | 1.0 ppb (1) | 33.0 ppb (25) | 0.19 ppb (2) | N/A | 3.8 μg/m3 (16) | 25.0 | |
| March 21, 2019, 9 a.m. | N/A | 0.1 ppb (0) | 13.3 ppb (12) | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 39.0 ppb (30) | 0.19 ppb (2) | N/A | 2.4 μg/m3 (10) | 30.0 | |
| March 21, 2019, 8 a.m. | N/A | 0.1 ppb (0) | 9.3 ppb (9) | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 43.0 ppb (33) | 0.18 ppb (2) | N/A | 7.7 μg/m3 (32) | 33.0 | |
| March 21, 2019, 7 a.m. | N/A | 0.1 ppb (0) | 9.5 ppb (9) | 9.0 ppb (8) | N/A | N/A | 44.0 ppb (34) | 0.2 ppb (2) | N/A | 3.6 μg/m3 (15) | 34.0 | |
| March 21, 2019, 6 a.m. | N/A | 0.1 ppb (0) | 14.6 ppb (14) | 14.0 ppb (13) | N/A | N/A | 38.0 ppb (29) | 0.21 ppb (2) | N/A | 3.1 μg/m3 (13) | 29.0 | |
| March 21, 2019, 5 a.m. | N/A | 0.2 ppb (0) | 9.1 ppb (8) | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 44.0 ppb (34) | 0.2 ppb (2) | N/A | 1.5 μg/m3 (6) | 34.0 | |
| March 21, 2019, 4 a.m. | N/A | 0.3 ppb (0) | 4.6 ppb (4) | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 50.0 ppb (38) | 0.16 ppb (2) | N/A | 1.5 μg/m3 (6) | 38.0 | |
| March 21, 2019, 3 a.m. | N/A | 0.1 ppb (0) | 3.0 ppb (3) | 3.0 ppb (3) | N/A | N/A | 52.0 ppb (40) | 0.17 ppb (2) | N/A | 2.1 μg/m3 (9) | 40.0 | |
| March 21, 2019, 2 a.m. | N/A | 0.2 ppb (0) | 2.6 ppb (2) | 2.0 ppb (2) | N/A | N/A | 53.0 ppb (41) | 0.16 ppb (2) | N/A | 1.0 μg/m3 (4) | 41.0 | |
| March 21, 2019, 1 a.m. | N/A | 0.2 ppb (0) | 2.0 ppb (2) | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 52.0 ppb (40) | 0.14 ppb (2) | N/A | 1.8 μg/m3 (8) | 40.0 | |
| March 21, 2019, midnight | N/A | 0.3 ppb (0) | 2.0 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | 53.0 ppb (41) | 0.15 ppb (2) | N/A | 2.6 μg/m3 (11) | 41.0 | |
| March 20, 2019, 11 p.m. | N/A | 0.3 ppb (0) | 2.0 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | 54.0 ppb (42) | 0.15 ppb (2) | N/A | 0.6 μg/m3 (2) | 42.0 | |
| March 20, 2019, 10 p.m. | N/A | 0.4 ppb (0) | 2.7 ppb (3) | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 52.0 ppb (40) | 0.16 ppb (2) | N/A | 1.1 μg/m3 (5) | 40.0 | |
| March 20, 2019, 9 p.m. | N/A | 6.7 ppb (6) | 22.7 ppb (21) | 16.0 ppb (15) | N/A | 1.0 ppb (1) | 36.0 ppb (28) | 0.25 ppb (3) | N/A | 1.3 μg/m3 (5) | 28.0 | |
| March 20, 2019, 8 p.m. | N/A | 15.7 ppb (15) | 39.8 ppb (37) | 26.0 ppb (24) | N/A | 1.0 ppb (1) | 24.0 ppb (18) | 0.28 ppb (3) | N/A | 5.5 μg/m3 (23) | 37.0 | |
| March 20, 2019, 7 p.m. | N/A | 25.2 ppb (23) | 53.1 ppb (49) | 30.0 ppb (28) | N/A | 1.0 ppb (1) | 18.0 ppb (14) | 0.34 ppb (4) | N/A | 7.8 μg/m3 (32) | 49.0 | |
| March 20, 2019, 6 p.m. | N/A | 18.1 ppb (17) | 43.5 ppb (40) | 27.0 ppb (25) | N/A | 1.0 ppb (1) | 20.0 ppb (15) | 0.44 ppb (5) | N/A | 6.7 μg/m3 (28) | 40.0 | |
| March 20, 2019, 5 p.m. | N/A | 56.3 ppb (52) | 91.2 ppb (90) | 36.0 ppb (33) | N/A | 2.0 ppb (3) | 9.0 ppb (7) | 0.44 ppb (5) | N/A | 7.3 μg/m3 (30) | 90.0 | |
| March 20, 2019, 4 p.m. | N/A | 53.7 ppb (50) | 89.1 ppb (87) | 37.0 ppb (34) | N/A | 2.0 ppb (3) | 8.0 ppb (6) | 0.53 ppb (6) | N/A | 8.0 μg/m3 (33) | 87.0 | |
| March 20, 2019, 3 p.m. | N/A | 39.1 ppb (36) | 74.8 ppb (72) | 37.0 ppb (34) | N/A | 2.0 ppb (3) | 7.0 ppb (5) | 0.43 ppb (5) | N/A | 3.0 μg/m3 (12) | 72.0 | |
| March 20, 2019, 2 p.m. | N/A | 29.5 ppb (27) | 69.0 ppb (66) | 41.0 ppb (38) | N/A | 1.0 ppb (1) | 3.0 ppb (2) | 0.31 ppb (3) | N/A | 7.8 μg/m3 (32) | 66.0 | |
| March 20, 2019, 1 p.m. | N/A | 17.8 ppb (16) | 59.0 ppb (55) | 43.0 ppb (40) | N/A | 1.0 ppb (1) | 3.0 ppb (2) | 0.24 ppb (3) | N/A | 4.3 μg/m3 (18) | 55.0 | |
| March 20, 2019, noon | N/A | 1.4 ppb (1) | 21.7 ppb (20) | 21.0 ppb (19) | N/A | 1.0 ppb (1) | 26.0 ppb (20) | 0.18 ppb (2) | N/A | 2.8 μg/m3 (12) | 20.0 | |
| March 20, 2019, 11 a.m. | N/A | 0.0 ppb (0) | 13.6 ppb (13) | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 35.0 ppb (27) | 0.16 ppb (2) | N/A | 2.1 μg/m3 (9) | 27.0 | |
| March 20, 2019, 10 a.m. | N/A | 0.0 ppb (0) | 1.9 ppb (2) | 2.0 ppb (2) | N/A | 1.0 ppb (1) | N/A | 0.14 ppb (2) | N/A | 2.4 μg/m3 (10) | 10.0 | |
| March 20, 2019, 9 a.m. | N/A | 0.0 ppb (0) | 2.2 ppb (2) | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 48.0 ppb (37) | 0.15 ppb (2) | N/A | 0.6 μg/m3 (2) | 37.0 | |
| March 20, 2019, 8 a.m. | N/A | 0.1 ppb (0) | 1.5 ppb (1) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | 50.0 ppb (38) | N/A | N/A | 1.6 μg/m3 (7) | 38.0 | |
| March 20, 2019, 7 a.m. | N/A | 0.1 ppb (0) | 1.3 ppb (1) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | 51.0 ppb (39) | N/A | N/A | 0.3 μg/m3 (1) | 39.0 | |
| March 20, 2019, 6 a.m. | N/A | 0.0 ppb (0) | 1.2 ppb (1) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | 51.0 ppb (39) | 0.14 ppb (2) | N/A | 1.4 μg/m3 (6) | 39.0 | |
| March 20, 2019, 5 a.m. | N/A | 0.1 ppb (0) | 1.8 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | 51.0 ppb (39) | 0.15 ppb (2) | N/A | 1.2 μg/m3 (5) | 39.0 | |
| March 20, 2019, 4 a.m. | N/A | 0.2 ppb (0) | 3.5 ppb (3) | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 49.0 ppb (38) | 0.18 ppb (2) | N/A | 0.5 μg/m3 (2) | 38.0 | |
| March 20, 2019, 3 a.m. | N/A | 0.3 ppb (0) | 4.8 ppb (4) | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 48.0 ppb (37) | 0.17 ppb (2) | N/A | 2.4 μg/m3 (10) | 37.0 | |
| March 20, 2019, 2 a.m. | N/A | 0.3 ppb (0) | 6.3 ppb (6) | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 47.0 ppb (36) | 0.21 ppb (2) | N/A | 1.2 μg/m3 (5) | 36.0 | |
| March 20, 2019, 1 a.m. | N/A | 0.5 ppb (0) | 5.2 ppb (5) | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 48.0 ppb (37) | 0.2 ppb (2) | N/A | 0.6 μg/m3 (2) | 37.0 | |
| March 20, 2019, midnight | N/A | 0.4 ppb (0) | 3.0 ppb (3) | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 51.0 ppb (39) | 0.17 ppb (2) | N/A | 2.3 μg/m3 (10) | 39.0 | |
| March 19, 2019, 11 p.m. | N/A | 0.3 ppb (0) | 2.1 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | 52.0 ppb (40) | 0.16 ppb (2) | N/A | 1.8 μg/m3 (8) | 40.0 | |
| March 19, 2019, 10 p.m. | N/A | 0.3 ppb (0) | 2.2 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | 52.0 ppb (40) | 0.17 ppb (2) | N/A | 1.3 μg/m3 (5) | 40.0 | |
| March 19, 2019, 9 p.m. | N/A | 0.4 ppb (0) | 2.1 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | 52.0 ppb (40) | 0.16 ppb (2) | N/A | 0.5 μg/m3 (2) | 40.0 | |
| March 19, 2019, 8 p.m. | N/A | 0.3 ppb (0) | 2.0 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | 52.0 ppb (40) | 0.15 ppb (2) | N/A | 2.6 μg/m3 (11) | 40.0 | |
| March 19, 2019, 7 p.m. | N/A | 0.3 ppb (0) | 2.0 ppb (2) | N/A | N/A | 1.0 ppb (1) | 52.0 ppb (40) | 0.15 ppb (2) | N/A | -0.1 μg/m3 (0) | 40.0 | |
| March 19, 2019, 6 p.m. | N/A | 28.1 ppb (26) | 58.0 ppb (54) | N/A | N/A | 1.0 ppb (1) | 20.0 ppb (15) | 0.35 ppb (4) | N/A | 5.5 μg/m3 (23) | 54.0 | |
| March 19, 2019, 5 p.m. | N/A | 26.2 ppb (24) | 56.3 ppb (52) | 32.0 ppb (30) | N/A | 2.0 ppb (3) | 16.0 ppb (12) | 0.33 ppb (4) | N/A | 5.5 μg/m3 (23) | 52.0 | |
| March 19, 2019, 4 p.m. | N/A | 50.7 ppb (47) | 86.3 ppb (84) | 37.0 ppb (34) | N/A | 2.0 ppb (3) | 9.0 ppb (7) | 0.39 ppb (4) | N/A | 11.6 μg/m3 (48) | 84.0 | |
| March 19, 2019, 3 p.m. | N/A | 54.7 ppb (51) | 93.4 ppb (92) | 40.0 ppb (37) | N/A | 2.0 ppb (3) | 11.0 ppb (8) | 0.48 ppb (5) | N/A | 5.8 μg/m3 (24) | 92.0 | |
| March 19, 2019, 2 p.m. | N/A | 9.9 ppb (9) | 24.8 ppb (23) | 15.0 ppb (14) | N/A | 1.0 ppb (1) | 36.0 ppb (28) | 0.25 ppb (3) | N/A | 2.6 μg/m3 (11) | 28.0 | |
| March 19, 2019, 1 p.m. | N/A | 0.5 ppb (0) | 7.8 ppb (7) | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 45.0 ppb (35) | 0.17 ppb (2) | N/A | 2.0 μg/m3 (8) | 35.0 | |
| March 19, 2019, noon | N/A | 0.1 ppb (0) | 4.1 ppb (4) | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 47.0 ppb (36) | 0.16 ppb (2) | N/A | 2.0 μg/m3 (8) | 36.0 | |
| March 19, 2019, 11 a.m. | N/A | 0.0 ppb (0) | 1.6 ppb (1) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | 51.0 ppb (39) | 0.14 ppb (2) | N/A | 0.7 μg/m3 (3) | 39.0 | |
| March 19, 2019, 10 a.m. | N/A | 0.1 ppb (0) | 2.9 ppb (3) | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 51.0 ppb (39) | 0.15 ppb (2) | N/A | 2.4 μg/m3 (10) | 39.0 | |
| March 19, 2019, 9 a.m. | N/A | 0.0 ppb (0) | 1.5 ppb (1) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | 52.0 ppb (40) | 0.14 ppb (2) | N/A | 1.2 μg/m3 (5) | 40.0 | |
| March 19, 2019, 8 a.m. | N/A | 0.0 ppb (0) | 1.9 ppb (2) | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 51.0 ppb (39) | 0.15 ppb (2) | N/A | 2.0 μg/m3 (8) | 39.0 | |
| March 19, 2019, 7 a.m. | N/A | 0.0 ppb (0) | 3.9 ppb (4) | 3.0 ppb (3) | N/A | N/A | 46.0 ppb (35) | 0.18 ppb (2) | N/A | 1.6 μg/m3 (7) | 35.0 | |
| March 19, 2019, 6 a.m. | N/A | 0.1 ppb (0) | 3.2 ppb (3) | 3.0 ppb (3) | N/A | N/A | 47.0 ppb (36) | 0.16 ppb (2) | N/A | 2.0 μg/m3 (8) | 36.0 | |
| March 19, 2019, 5 a.m. | N/A | 0.1 ppb (0) | 3.1 ppb (3) | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 49.0 ppb (38) | 0.15 ppb (2) | N/A | 2.2 μg/m3 (9) | 38.0 | |
| March 19, 2019, 4 a.m. | N/A | 0.1 ppb (0) | 4.5 ppb (4) | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 47.0 ppb (36) | 0.17 ppb (2) | N/A | 1.5 μg/m3 (6) | 36.0 | |
| March 19, 2019, 3 a.m. | N/A | 0.1 ppb (0) | 2.7 ppb (3) | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 50.0 ppb (38) | 0.16 ppb (2) | N/A | 2.0 μg/m3 (8) | 38.0 | |
| March 19, 2019, 2 a.m. | N/A | 0.1 ppb (0) | 3.4 ppb (3) | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 50.0 ppb (38) | 0.16 ppb (2) | N/A | 1.2 μg/m3 (5) | 38.0 | |
| March 19, 2019, 1 a.m. | N/A | 0.3 ppb (0) | 3.7 ppb (3) | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 49.0 ppb (38) | 0.16 ppb (2) | N/A | 2.4 μg/m3 (10) | 38.0 | |
| March 19, 2019, midnight | N/A | N/A | 23.6 ppb (22) | N/A | N/A | 1.0 ppb (1) | N/A | 0.23 ppb (3) | N/A | 4.9 μg/m3 (20) | 22.0 | |
| March 18, 2019, 11 p.m. | N/A | 11.0 ppb (10) | 34.8 ppb (32) | 25.0 ppb (23) | N/A | 1.0 ppb (1) | N/A | 0.28 ppb (3) | N/A | 6.2 μg/m3 (26) | 32.0 | |
| March 18, 2019, 10 p.m. | N/A | 12.9 ppb (12) | 35.9 ppb (33) | 24.0 ppb (22) | N/A | 1.0 ppb (1) | N/A | 0.27 ppb (3) | N/A | 5.6 μg/m3 (23) | 33.0 | |
| March 18, 2019, 9 p.m. | N/A | 7.4 ppb (7) | 22.1 ppb (20) | 16.0 ppb (15) | N/A | 1.0 ppb (1) | N/A | 0.24 ppb (3) | N/A | 4.1 μg/m3 (17) | 20.0 | |
| March 18, 2019, 8 p.m. | N/A | 1.3 ppb (1) | 6.1 ppb (6) | 4.0 ppb (4) | N/A | 1.0 ppb (1) | N/A | 0.18 ppb (2) | N/A | 3.2 μg/m3 (13) | 13.0 | |
| March 18, 2019, 7 p.m. | N/A | 12.8 ppb (12) | 26.7 ppb (25) | 14.0 ppb (13) | N/A | 1.0 ppb (1) | N/A | 0.26 ppb (3) | N/A | 3.6 μg/m3 (15) | 25.0 | |
| March 18, 2019, 6 p.m. | N/A | 18.8 ppb (17) | 37.4 ppb (35) | 20.0 ppb (19) | N/A | 1.0 ppb (1) | N/A | 0.28 ppb (3) | N/A | 3.8 μg/m3 (16) | 35.0 | |
| March 18, 2019, 5 p.m. | N/A | 13.0 ppb (12) | 28.4 ppb (26) | 16.0 ppb (15) | N/A | 1.0 ppb (1) | N/A | 0.29 ppb (3) | N/A | 4.0 μg/m3 (17) | 26.0 | |
| March 18, 2019, 4 p.m. | N/A | 5.2 ppb (5) | 16.1 ppb (15) | 11.0 ppb (10) | N/A | 1.0 ppb (1) | N/A | 0.25 ppb (3) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 18, 2019, 3 p.m. | N/A | 3.9 ppb (4) | 16.7 ppb (15) | 13.0 ppb (12) | N/A | 1.0 ppb (1) | N/A | 0.26 ppb (3) | N/A | 4.1 μg/m3 (17) | 17.0 | |
| March 18, 2019, 2 p.m. | N/A | 2.1 ppb (2) | 22.1 ppb (20) | 20.0 ppb (19) | N/A | 1.0 ppb (1) | N/A | 0.28 ppb (3) | N/A | 4.3 μg/m3 (18) | 20.0 | |
| March 18, 2019, 1 p.m. | N/A | 0.2 ppb (0) | 11.9 ppb (11) | 12.0 ppb (11) | N/A | 1.0 ppb (1) | N/A | 0.22 ppb (2) | N/A | 3.8 μg/m3 (16) | 16.0 | |
| March 18, 2019, noon | N/A | 0.1 ppb (0) | 8.5 ppb (8) | 8.0 ppb (7) | N/A | 1.0 ppb (1) | N/A | 0.2 ppb (2) | N/A | 4.8 μg/m3 (20) | 20.0 | |
| March 18, 2019, 11 a.m. | N/A | 0.1 ppb (0) | 7.1 ppb (7) | 6.0 ppb (6) | N/A | 1.0 ppb (1) | N/A | 0.19 ppb (2) | N/A | 5.2 μg/m3 (22) | 22.0 | |
| March 18, 2019, 10 a.m. | N/A | 0.1 ppb (0) | 7.9 ppb (7) | 7.0 ppb (6) | N/A | 1.0 ppb (1) | N/A | 0.2 ppb (2) | N/A | 5.2 μg/m3 (22) | 22.0 | |
| March 18, 2019, 9 a.m. | N/A | 0.1 ppb (0) | 8.4 ppb (8) | 7.0 ppb (6) | N/A | 1.0 ppb (1) | N/A | 0.19 ppb (2) | N/A | 4.7 μg/m3 (20) | 20.0 | |
| March 18, 2019, 8 a.m. | N/A | 0.3 ppb (0) | 11.7 ppb (11) | 10.0 ppb (9) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | 5.7 μg/m3 (24) | 24.0 | |
| March 18, 2019, 7 a.m. | N/A | 0.2 ppb (0) | 12.9 ppb (12) | 12.0 ppb (11) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | 6.4 μg/m3 (27) | 27.0 | |
| March 18, 2019, 6 a.m. | N/A | 4.0 ppb (4) | 33.0 ppb (31) | 29.0 ppb (27) | N/A | 1.0 ppb (1) | N/A | 0.3 ppb (3) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 18, 2019, 5 a.m. | N/A | 0.2 ppb (0) | 15.6 ppb (14) | 14.0 ppb (13) | N/A | 1.0 ppb (1) | N/A | 0.28 ppb (3) | N/A | 9.3 μg/m3 (39) | 39.0 | |
| March 18, 2019, 4 a.m. | N/A | 0.4 ppb (0) | 13.3 ppb (12) | 12.0 ppb (11) | N/A | 1.0 ppb (1) | N/A | 0.26 ppb (3) | N/A | 7.5 μg/m3 (31) | 31.0 | |
| March 18, 2019, 3 a.m. | N/A | 0.3 ppb (0) | 15.6 ppb (14) | 15.0 ppb (14) | N/A | 1.0 ppb (1) | N/A | 0.3 ppb (3) | N/A | 9.9 μg/m3 (41) | 41.0 | |
| March 18, 2019, 2 a.m. | N/A | 0.4 ppb (0) | 17.7 ppb (16) | 17.0 ppb (16) | N/A | 1.0 ppb (1) | N/A | 0.31 ppb (3) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 18, 2019, 1 a.m. | N/A | 2.2 ppb (2) | 19.0 ppb (18) | 17.0 ppb (16) | N/A | 1.0 ppb (1) | N/A | 0.28 ppb (3) | N/A | 6.8 μg/m3 (28) | 28.0 | |
| March 18, 2019, midnight | N/A | 2.6 ppb (2) | 13.0 ppb (12) | 10.0 ppb (9) | N/A | 1.0 ppb (1) | N/A | 0.25 ppb (3) | N/A | 5.5 μg/m3 (23) | 23.0 | |
| March 17, 2019, 11 p.m. | N/A | 2.2 ppb (2) | 9.6 ppb (9) | 7.0 ppb (6) | N/A | 1.0 ppb (1) | N/A | 0.23 ppb (3) | N/A | 4.3 μg/m3 (18) | 18.0 | |
| March 17, 2019, 10 p.m. | N/A | 3.1 ppb (3) | 10.4 ppb (10) | 7.0 ppb (6) | N/A | 1.0 ppb (1) | N/A | 0.24 ppb (3) | N/A | 6.4 μg/m3 (27) | 27.0 | |
| March 17, 2019, 9 p.m. | N/A | 3.5 ppb (3) | 10.4 ppb (10) | 7.0 ppb (6) | N/A | 1.0 ppb (1) | N/A | 0.22 ppb (2) | N/A | 5.2 μg/m3 (22) | 22.0 | |
| March 17, 2019, 8 p.m. | N/A | 4.4 ppb (4) | 12.0 ppb (11) | 7.0 ppb (6) | N/A | 1.0 ppb (1) | N/A | 0.22 ppb (2) | N/A | 5.2 μg/m3 (22) | 22.0 | |
| March 17, 2019, 7 p.m. | N/A | 4.6 ppb (4) | 12.7 ppb (12) | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 26.0 ppb (20) | 0.23 ppb (3) | N/A | 6.3 μg/m3 (26) | 26.0 | |
| March 17, 2019, 6 p.m. | N/A | 4.3 ppb (4) | 11.8 ppb (11) | 7.0 ppb (6) | N/A | 1.0 ppb (1) | 23.0 ppb (18) | 0.24 ppb (3) | N/A | 4.9 μg/m3 (20) | 20.0 | |
| March 17, 2019, 5 p.m. | N/A | 2.7 ppb (3) | 8.3 ppb (8) | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 24.0 ppb (18) | 0.22 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 17, 2019, 4 p.m. | N/A | 2.6 ppb (2) | 9.2 ppb (9) | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 21.0 ppb (16) | 0.22 ppb (2) | N/A | 7.7 μg/m3 (32) | 32.0 | |
| March 17, 2019, 3 p.m. | N/A | 2.6 ppb (2) | 12.2 ppb (11) | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 15.0 ppb (12) | 0.25 ppb (3) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 17, 2019, 2 p.m. | N/A | 1.0 ppb (1) | 16.8 ppb (16) | 15.0 ppb (14) | N/A | 1.0 ppb (1) | 12.0 ppb (9) | 0.26 ppb (3) | N/A | 9.4 μg/m3 (39) | 39.0 | |
| March 17, 2019, 1 p.m. | N/A | 0.2 ppb (0) | 11.8 ppb (11) | 10.0 ppb (9) | N/A | N/A | 16.0 ppb (12) | 0.25 ppb (3) | N/A | 10.4 μg/m3 (43) | 43.0 | |
| March 17, 2019, noon | N/A | 0.2 ppb (0) | 11.1 ppb (10) | 10.0 ppb (9) | N/A | N/A | 15.0 ppb (12) | 0.25 ppb (3) | N/A | 8.6 μg/m3 (36) | 36.0 | |
| March 17, 2019, 11 a.m. | N/A | 0.1 ppb (0) | 12.9 ppb (12) | 12.0 ppb (11) | N/A | 2.0 ppb (3) | 18.0 ppb (14) | 0.25 ppb (3) | N/A | 8.5 μg/m3 (35) | 35.0 | |
| March 17, 2019, 10 a.m. | N/A | 0.1 ppb (0) | 15.5 ppb (14) | 14.0 ppb (13) | N/A | 2.0 ppb (3) | 17.0 ppb (13) | 0.28 ppb (3) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 17, 2019, 9 a.m. | N/A | 0.2 ppb (0) | 13.5 ppb (12) | 12.0 ppb (11) | N/A | 1.0 ppb (1) | 19.0 ppb (15) | 0.27 ppb (3) | N/A | 10.8 μg/m3 (45) | 45.0 | |
| March 17, 2019, 8 a.m. | N/A | 0.3 ppb (0) | 15.5 ppb (14) | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 17.0 ppb (13) | 0.3 ppb (3) | N/A | 13.4 μg/m3 (53) | 53.0 | |
| March 17, 2019, 7 a.m. | N/A | 0.2 ppb (0) | 16.5 ppb (15) | 15.0 ppb (14) | N/A | N/A | 17.0 ppb (13) | 0.33 ppb (4) | N/A | 12.3 μg/m3 (51) | 51.0 | |
| March 17, 2019, 6 a.m. | N/A | 0.6 ppb (1) | 17.8 ppb (16) | 15.0 ppb (14) | N/A | N/A | 17.0 ppb (13) | 0.33 ppb (4) | N/A | 10.9 μg/m3 (45) | 45.0 | |
| March 17, 2019, 5 a.m. | N/A | 1.4 ppb (1) | 26.6 ppb (25) | 24.0 ppb (22) | N/A | 1.0 ppb (1) | 11.0 ppb (8) | 0.38 ppb (4) | N/A | 13.9 μg/m3 (54) | 54.0 | |
| March 17, 2019, 4 a.m. | N/A | 4.5 ppb (4) | 40.0 ppb (37) | 36.0 ppb (33) | N/A | 1.0 ppb (1) | 4.0 ppb (3) | 0.37 ppb (4) | N/A | 9.8 μg/m3 (41) | 41.0 | |
| March 17, 2019, 3 a.m. | N/A | 0.3 ppb (0) | 21.6 ppb (20) | 21.0 ppb (19) | N/A | 1.0 ppb (1) | 21.0 ppb (16) | 0.37 ppb (4) | N/A | 8.3 μg/m3 (35) | 35.0 | |
| March 17, 2019, 2 a.m. | N/A | 0.4 ppb (0) | 20.1 ppb (19) | 20.0 ppb (19) | N/A | 1.0 ppb (1) | 22.0 ppb (17) | 0.28 ppb (3) | N/A | 5.3 μg/m3 (22) | 22.0 | |
| March 17, 2019, 1 a.m. | N/A | 1.8 ppb (2) | 18.9 ppb (18) | 18.0 ppb (17) | N/A | N/A | 22.0 ppb (17) | 0.26 ppb (3) | N/A | 5.3 μg/m3 (22) | 22.0 | |
| March 17, 2019, midnight | N/A | 1.8 ppb (2) | 13.8 ppb (13) | 12.0 ppb (11) | N/A | N/A | 32.0 ppb (25) | 0.21 ppb (2) | N/A | 4.4 μg/m3 (18) | 25.0 | |
| March 16, 2019, 11 p.m. | N/A | 2.9 ppb (3) | 13.6 ppb (13) | 11.0 ppb (10) | N/A | N/A | 33.0 ppb (25) | 0.2 ppb (2) | N/A | 3.9 μg/m3 (16) | 25.0 | |
| March 16, 2019, 10 p.m. | N/A | 3.3 ppb (3) | 12.1 ppb (11) | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 34.0 ppb (26) | 0.22 ppb (2) | N/A | 4.4 μg/m3 (18) | 26.0 | |
| March 16, 2019, 9 p.m. | N/A | 5.8 ppb (5) | 18.2 ppb (17) | 12.0 ppb (11) | N/A | 1.0 ppb (1) | 30.0 ppb (23) | 0.23 ppb (3) | N/A | 5.5 μg/m3 (23) | 23.0 | |
| March 16, 2019, 8 p.m. | N/A | 6.0 ppb (6) | 18.8 ppb (17) | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 27.0 ppb (21) | 0.26 ppb (3) | N/A | 8.8 μg/m3 (37) | 37.0 | |
| March 16, 2019, 7 p.m. | N/A | 13.5 ppb (12) | 30.9 ppb (29) | 17.0 ppb (16) | N/A | 1.0 ppb (1) | 18.0 ppb (14) | 0.3 ppb (3) | N/A | 10.1 μg/m3 (42) | 42.0 | |
| March 16, 2019, 6 p.m. | N/A | 27.2 ppb (25) | 49.4 ppb (46) | 22.0 ppb (20) | N/A | 1.0 ppb (1) | 12.0 ppb (9) | 0.37 ppb (4) | N/A | 11.6 μg/m3 (48) | 48.0 | |
| March 16, 2019, 5 p.m. | N/A | 26.5 ppb (25) | 50.1 ppb (46) | 24.0 ppb (22) | N/A | 1.0 ppb (1) | 9.0 ppb (7) | 0.39 ppb (4) | N/A | 12.6 μg/m3 (51) | 51.0 | |
| March 16, 2019, 4 p.m. | N/A | 9.6 ppb (9) | 24.7 ppb (23) | 15.0 ppb (14) | N/A | 1.0 ppb (1) | 14.0 ppb (11) | 0.32 ppb (4) | N/A | 6.7 μg/m3 (28) | 28.0 | |
| March 16, 2019, 3 p.m. | N/A | 3.4 ppb (3) | 16.4 ppb (15) | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 11.0 ppb (8) | 0.29 ppb (3) | N/A | 8.4 μg/m3 (35) | 35.0 | |
| March 16, 2019, 2 p.m. | N/A | 1.4 ppb (1) | 16.9 ppb (16) | 15.0 ppb (14) | N/A | 1.0 ppb (1) | 9.0 ppb (7) | 0.3 ppb (3) | N/A | 10.9 μg/m3 (45) | 45.0 | |
| March 16, 2019, 1 p.m. | N/A | 0.4 ppb (0) | 14.8 ppb (14) | 14.0 ppb (13) | N/A | 1.0 ppb (1) | 9.0 ppb (7) | 0.29 ppb (3) | N/A | 10.1 μg/m3 (42) | 42.0 | |
| March 16, 2019, noon | N/A | 0.6 ppb (1) | 16.3 ppb (15) | 15.0 ppb (14) | N/A | 1.0 ppb (1) | 11.0 ppb (8) | 0.29 ppb (3) | N/A | 9.1 μg/m3 (38) | 38.0 | |
| March 16, 2019, 11 a.m. | N/A | 0.2 ppb (0) | 14.3 ppb (13) | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 16.0 ppb (12) | 0.27 ppb (3) | N/A | 8.6 μg/m3 (36) | 36.0 | |
| March 16, 2019, 10 a.m. | N/A | 0.0 ppb (0) | 11.4 ppb (11) | 10.0 ppb (9) | N/A | 1.0 ppb (1) | N/A | 0.26 ppb (3) | N/A | 7.1 μg/m3 (30) | 30.0 | |
| March 16, 2019, 9 a.m. | N/A | 0.2 ppb (0) | 13.8 ppb (13) | 12.0 ppb (11) | N/A | 1.0 ppb (1) | 19.0 ppb (15) | 0.29 ppb (3) | N/A | 8.7 μg/m3 (36) | 36.0 | |
| March 16, 2019, 8 a.m. | N/A | 0.3 ppb (0) | 17.6 ppb (16) | 16.0 ppb (15) | N/A | 1.0 ppb (1) | 17.0 ppb (13) | N/A | N/A | 9.5 μg/m3 (40) | 40.0 | |
| March 16, 2019, 7 a.m. | N/A | 2.8 ppb (3) | 26.1 ppb (24) | 23.0 ppb (21) | N/A | 1.0 ppb (1) | 13.0 ppb (10) | N/A | N/A | 8.9 μg/m3 (37) | 37.0 | |
| March 16, 2019, 6 a.m. | N/A | 0.1 ppb (0) | 15.6 ppb (14) | 15.0 ppb (14) | N/A | 1.0 ppb (1) | 21.0 ppb (16) | 0.29 ppb (3) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 16, 2019, 5 a.m. | N/A | 0.2 ppb (0) | 16.9 ppb (16) | 16.0 ppb (15) | N/A | 1.0 ppb (1) | 20.0 ppb (15) | 0.33 ppb (4) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 16, 2019, 4 a.m. | N/A | 0.4 ppb (0) | 16.0 ppb (15) | 14.0 ppb (13) | N/A | 1.0 ppb (1) | 23.0 ppb (18) | 0.29 ppb (3) | N/A | 6.4 μg/m3 (27) | 27.0 | |
| March 16, 2019, 3 a.m. | N/A | 0.2 ppb (0) | 13.3 ppb (12) | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 27.0 ppb (21) | 0.27 ppb (3) | N/A | 7.8 μg/m3 (32) | 32.0 | |
| March 16, 2019, 2 a.m. | N/A | 0.1 ppb (0) | 11.4 ppb (11) | 11.0 ppb (10) | N/A | 1.0 ppb (1) | 29.0 ppb (22) | 0.26 ppb (3) | N/A | 5.5 μg/m3 (23) | 23.0 | |
| March 16, 2019, 1 a.m. | N/A | 1.0 ppb (1) | 12.3 ppb (11) | 11.0 ppb (10) | N/A | 1.0 ppb (1) | 31.0 ppb (24) | 0.24 ppb (3) | N/A | 5.4 μg/m3 (23) | 24.0 |