Wilmington DE, US: 39.7394, -75.5581
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 25, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 36.0 ppb (28) | 0.28 ppb (3) | N/A | 13.9 μg/m3 (54) | 54.0 | |
| March 25, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | 0.3 ppb (3) | N/A | 13.2 μg/m3 (53) | 53.0 | |
| March 25, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.31 ppb (3) | N/A | 12.1 μg/m3 (50) | 50.0 | |
| March 25, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | 0.31 ppb (3) | N/A | 11.2 μg/m3 (47) | 47.0 | |
| March 25, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 33.0 ppb (25) | 0.31 ppb (3) | N/A | 10.8 μg/m3 (45) | 45.0 | |
| March 25, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 41.0 ppb (32) | 0.26 ppb (3) | N/A | 9.7 μg/m3 (40) | 40.0 | |
| March 25, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 42.0 ppb (32) | N/A | N/A | 8.7 μg/m3 (36) | 36.0 | |
| March 25, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 41.0 ppb (32) | 0.25 ppb (3) | N/A | 7.5 μg/m3 (31) | 32.0 | |
| March 25, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 7.3 μg/m3 (30) | 30.0 | |
| March 25, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.42 ppb (5) | N/A | 8.9 μg/m3 (37) | 37.0 | |
| March 25, 2019, noon | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 4.0 ppb (3) | 0.56 ppb (6) | N/A | 10.2 μg/m3 (42) | 42.0 | |
| March 25, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 1.0 ppb (1) | 0.59 ppb (7) | N/A | 7.9 μg/m3 (33) | 33.0 | |
| March 25, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 0.0 ppb (0) | 0.47 ppb (5) | N/A | 6.7 μg/m3 (28) | 28.0 | |
| March 25, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 6.0 ppb (5) | 0.31 ppb (3) | N/A | 5.2 μg/m3 (22) | 22.0 | |
| March 25, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 22.0 ppb (17) | 0.26 ppb (3) | N/A | 4.6 μg/m3 (19) | 19.0 | |
| March 25, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | 0.23 ppb (3) | N/A | 4.4 μg/m3 (18) | 25.0 | |
| March 25, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 24.0 ppb (18) | 0.27 ppb (3) | N/A | 4.7 μg/m3 (20) | 20.0 | |
| March 25, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 28.0 ppb (22) | 0.26 ppb (3) | N/A | 4.3 μg/m3 (18) | 22.0 | |
| March 25, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 36.0 ppb (28) | 0.23 ppb (3) | N/A | 4.1 μg/m3 (17) | 28.0 | |
| March 25, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | 0.23 ppb (3) | N/A | 3.9 μg/m3 (16) | 32.0 | |
| March 25, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.22 ppb (2) | N/A | 3.7 μg/m3 (15) | 33.0 | |
| March 25, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | 0.22 ppb (2) | N/A | 3.8 μg/m3 (16) | 32.0 | |
| March 25, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 42.0 ppb (32) | 0.24 ppb (3) | N/A | 4.6 μg/m3 (19) | 32.0 | |
| March 24, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 48.0 ppb (37) | 0.21 ppb (2) | N/A | 3.8 μg/m3 (16) | 37.0 | |
| March 24, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 52.0 ppb (40) | 0.18 ppb (2) | N/A | 3.2 μg/m3 (13) | 40.0 | |
| March 24, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 54.0 ppb (42) | 0.18 ppb (2) | N/A | 3.3 μg/m3 (14) | 42.0 | |
| March 24, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 54.0 ppb (42) | 0.2 ppb (2) | N/A | 3.2 μg/m3 (13) | 42.0 | |
| March 24, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 51.0 ppb (39) | 0.19 ppb (2) | N/A | 3.9 μg/m3 (16) | 39.0 | |
| March 24, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 50.0 ppb (38) | 0.18 ppb (2) | N/A | 4.3 μg/m3 (18) | 38.0 | |
| March 24, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.18 ppb (2) | N/A | 4.9 μg/m3 (20) | 38.0 | |
| March 24, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 49.0 ppb (38) | 0.18 ppb (2) | N/A | 5.6 μg/m3 (23) | 38.0 | |
| March 24, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 47.0 ppb (36) | 0.18 ppb (2) | N/A | 5.7 μg/m3 (24) | 36.0 | |
| March 24, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 41.0 ppb (32) | 0.2 ppb (2) | N/A | 5.6 μg/m3 (23) | 32.0 | |
| March 24, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 32.0 ppb (25) | 0.23 ppb (3) | N/A | 5.9 μg/m3 (25) | 25.0 | |
| March 24, 2019, noon | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 19.0 ppb (15) | 0.3 ppb (3) | N/A | 6.8 μg/m3 (28) | 28.0 | |
| March 24, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 5.0 ppb (4) | 0.4 ppb (4) | N/A | 6.9 μg/m3 (29) | 29.0 | |
| March 24, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 3.0 ppb (2) | 0.33 ppb (4) | N/A | 6.3 μg/m3 (26) | 26.0 | |
| March 24, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 8.0 ppb (6) | 0.31 ppb (3) | N/A | 5.8 μg/m3 (24) | 24.0 | |
| March 24, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 10.0 ppb (8) | 0.28 ppb (3) | N/A | 5.4 μg/m3 (23) | 23.0 | |
| March 24, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 15.0 ppb (12) | 0.29 ppb (3) | N/A | 4.5 μg/m3 (19) | 19.0 | |
| March 24, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 25.0 ppb (19) | 0.24 ppb (3) | N/A | 4.0 μg/m3 (17) | 19.0 | |
| March 24, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 29.0 ppb (22) | 0.23 ppb (3) | N/A | 3.5 μg/m3 (15) | 22.0 | |
| March 24, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | 0.25 ppb (3) | N/A | 3.4 μg/m3 (14) | 25.0 | |
| March 24, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | 0.23 ppb (3) | N/A | 3.7 μg/m3 (15) | 25.0 | |
| March 24, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 34.0 ppb (26) | 0.25 ppb (3) | N/A | 3.3 μg/m3 (14) | 26.0 | |
| March 24, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.21 ppb (2) | N/A | 3.1 μg/m3 (13) | 28.0 | |
| March 24, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.22 ppb (2) | N/A | 2.7 μg/m3 (11) | 28.0 | |
| March 23, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 41.0 ppb (32) | 0.18 ppb (2) | N/A | 2.0 μg/m3 (8) | 32.0 | |
| March 23, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.15 ppb (2) | N/A | 1.9 μg/m3 (8) | 33.0 | |
| March 23, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.15 ppb (2) | N/A | 1.8 μg/m3 (8) | 34.0 | |
| March 23, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.15 ppb (2) | N/A | 1.9 μg/m3 (8) | 34.0 | |
| March 23, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | 0.15 ppb (2) | N/A | 2.1 μg/m3 (9) | 32.0 | |
| March 23, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.13 ppb (1) | N/A | 2.3 μg/m3 (10) | 33.0 | |
| March 23, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.14 ppb (2) | N/A | 2.5 μg/m3 (10) | 34.0 | |
| March 23, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | 0.14 ppb (2) | N/A | 2.9 μg/m3 (12) | 32.0 | |
| March 23, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | 0.14 ppb (2) | N/A | 2.9 μg/m3 (12) | 31.0 | |
| March 23, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.14 ppb (2) | N/A | 2.7 μg/m3 (11) | 27.0 | |
| March 23, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | 0.15 ppb (2) | N/A | 2.9 μg/m3 (12) | 25.0 | |
| March 23, 2019, noon | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | 0.14 ppb (2) | N/A | 2.7 μg/m3 (11) | 25.0 | |
| March 23, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 28.0 ppb (22) | 0.15 ppb (2) | N/A | 2.5 μg/m3 (10) | 22.0 | |
| March 23, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 29.0 ppb (22) | 0.13 ppb (1) | N/A | 2.5 μg/m3 (10) | 22.0 | |
| March 23, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 30.0 ppb (23) | 0.12 ppb (1) | N/A | 2.3 μg/m3 (10) | 23.0 | |
| March 23, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 31.0 ppb (24) | 0.12 ppb (1) | N/A | 2.1 μg/m3 (9) | 24.0 | |
| March 23, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | 0.13 ppb (1) | N/A | 1.8 μg/m3 (8) | 25.0 | |
| March 23, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 33.0 ppb (25) | 0.13 ppb (1) | N/A | 1.4 μg/m3 (6) | 25.0 | |
| March 23, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.13 ppb (1) | N/A | 1.0 μg/m3 (4) | 27.0 | |
| March 23, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.14 ppb (2) | N/A | 1.1 μg/m3 (5) | 28.0 | |
| March 23, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.14 ppb (2) | N/A | 1.4 μg/m3 (6) | 28.0 | |
| March 23, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 36.0 ppb (28) | 0.15 ppb (2) | N/A | 1.6 μg/m3 (7) | 28.0 | |
| March 23, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.15 ppb (2) | N/A | 1.9 μg/m3 (8) | 27.0 | |
| March 23, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.17 ppb (2) | N/A | 2.5 μg/m3 (10) | 27.0 | |
| March 22, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 36.0 ppb (28) | 0.19 ppb (2) | N/A | 2.8 μg/m3 (12) | 28.0 | |
| March 22, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 39.0 ppb (30) | 0.17 ppb (2) | N/A | 3.9 μg/m3 (16) | 30.0 | |
| March 22, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 39.0 ppb (30) | 0.19 ppb (2) | N/A | 7.0 μg/m3 (29) | 30.0 | |
| March 22, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | 0.18 ppb (2) | N/A | 6.1 μg/m3 (25) | 32.0 | |
| March 22, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | 0.18 ppb (2) | N/A | 7.5 μg/m3 (31) | 32.0 | |
| March 22, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | 0.18 ppb (2) | N/A | 7.3 μg/m3 (30) | 32.0 | |
| March 22, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 41.0 ppb (32) | 0.19 ppb (2) | N/A | 5.8 μg/m3 (24) | 32.0 | |
| March 22, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | 0.21 ppb (2) | N/A | 4.8 μg/m3 (20) | 32.0 | |
| March 22, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | 0.23 ppb (3) | N/A | 5.4 μg/m3 (23) | 32.0 | |
| March 22, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | 0.21 ppb (2) | N/A | 8.3 μg/m3 (35) | 35.0 | |
| March 22, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.22 ppb (2) | N/A | 10.3 μg/m3 (43) | 43.0 | |
| March 22, 2019, noon | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 26.0 ppb (20) | 0.27 ppb (3) | N/A | 5.6 μg/m3 (23) | 23.0 | |
| March 22, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 30.0 ppb (23) | 0.23 ppb (3) | N/A | 2.7 μg/m3 (11) | 23.0 | |
| March 22, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.18 ppb (2) | N/A | 1.1 μg/m3 (5) | 27.0 | |
| March 22, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.16 ppb (2) | N/A | 0.5 μg/m3 (2) | 27.0 | |
| March 22, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 39.0 ppb (30) | 0.16 ppb (2) | N/A | 0.6 μg/m3 (2) | 30.0 | |
| March 22, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 39.0 ppb (30) | 0.16 ppb (2) | N/A | 0.7 μg/m3 (3) | 30.0 | |
| March 22, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.18 ppb (2) | N/A | 1.3 μg/m3 (5) | 28.0 | |
| March 22, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.15 ppb (2) | N/A | 1.1 μg/m3 (5) | 33.0 | |
| March 22, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.16 ppb (2) | N/A | 3.2 μg/m3 (13) | 33.0 | |
| March 22, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.18 ppb (2) | N/A | 4.4 μg/m3 (18) | 33.0 | |
| March 22, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 39.0 ppb (30) | 0.18 ppb (2) | N/A | 4.0 μg/m3 (17) | 30.0 | |
| March 22, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | 0.17 ppb (2) | N/A | 5.2 μg/m3 (22) | 31.0 | |
| March 22, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 41.0 ppb (32) | 0.17 ppb (2) | N/A | 6.1 μg/m3 (25) | 32.0 | |
| March 21, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 41.0 ppb (32) | 0.2 ppb (2) | N/A | 6.3 μg/m3 (26) | 32.0 | |
| March 21, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | 0.2 ppb (2) | N/A | 6.5 μg/m3 (27) | 32.0 | |
| March 21, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 39.0 ppb (30) | 0.24 ppb (3) | N/A | 5.5 μg/m3 (23) | 30.0 | |
| March 21, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | 0.26 ppb (3) | N/A | 6.3 μg/m3 (26) | 29.0 | |
| March 21, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.31 ppb (3) | N/A | 6.9 μg/m3 (29) | 29.0 | |
| March 21, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 36.0 ppb (28) | 0.27 ppb (3) | N/A | 5.5 μg/m3 (23) | 28.0 | |
| March 21, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 28.0 ppb (22) | 0.32 ppb (4) | N/A | 5.6 μg/m3 (23) | 23.0 | |
| March 21, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | 0.25 ppb (3) | N/A | 6.2 μg/m3 (26) | 26.0 | |
| March 21, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 34.0 ppb (26) | 0.23 ppb (3) | N/A | 6.3 μg/m3 (26) | 26.0 | |
| March 21, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 31.0 ppb (24) | 0.26 ppb (3) | N/A | 7.2 μg/m3 (30) | 30.0 | |
| March 21, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 31.0 ppb (24) | 0.28 ppb (3) | N/A | 6.7 μg/m3 (28) | 28.0 | |
| March 21, 2019, noon | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 30.0 ppb (23) | 0.26 ppb (3) | N/A | 7.6 μg/m3 (32) | 32.0 | |
| March 21, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 29.0 ppb (22) | 0.25 ppb (3) | N/A | 8.3 μg/m3 (35) | 35.0 | |
| March 21, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | 0.22 ppb (2) | N/A | 7.6 μg/m3 (32) | 32.0 | |
| March 21, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.22 ppb (2) | N/A | 7.1 μg/m3 (30) | 30.0 | |
| March 21, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.19 ppb (2) | N/A | 6.9 μg/m3 (29) | 29.0 | |
| March 21, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 39.0 ppb (30) | 0.18 ppb (2) | N/A | 6.8 μg/m3 (28) | 30.0 | |
| March 21, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | 0.18 ppb (2) | N/A | 6.3 μg/m3 (26) | 31.0 | |
| March 21, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | 0.18 ppb (2) | N/A | 6.0 μg/m3 (25) | 31.0 | |
| March 21, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | 0.2 ppb (2) | N/A | 6.0 μg/m3 (25) | 32.0 | |
| March 21, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.2 ppb (2) | N/A | 5.7 μg/m3 (24) | 34.0 | |
| March 21, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.2 ppb (2) | N/A | 5.6 μg/m3 (23) | 33.0 | |
| March 21, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.18 ppb (2) | N/A | 5.2 μg/m3 (22) | 34.0 | |
| March 21, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.18 ppb (2) | N/A | 5.2 μg/m3 (22) | 33.0 | |
| March 20, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 46.0 ppb (35) | 0.18 ppb (2) | N/A | 4.9 μg/m3 (20) | 35.0 | |
| March 20, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 46.0 ppb (35) | 0.21 ppb (2) | N/A | 4.8 μg/m3 (20) | 35.0 | |
| March 20, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.22 ppb (2) | N/A | 4.7 μg/m3 (20) | 36.0 | |
| March 20, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.21 ppb (2) | N/A | 4.7 μg/m3 (20) | 37.0 | |
| March 20, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 51.0 ppb (39) | 0.17 ppb (2) | N/A | 5.1 μg/m3 (21) | 39.0 | |
| March 20, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 46.0 ppb (35) | 0.2 ppb (2) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| March 20, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 26.0 ppb (20) | 0.35 ppb (4) | N/A | 19.9 μg/m3 (67) | 67.0 | |
| March 20, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 10.0 ppb (8) | 0.49 ppb (5) | N/A | 25.9 μg/m3 (80) | 80.0 | |
| March 20, 2019, noon | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 2.0 ppb (2) | 0.79 ppb (9) | N/A | 25.9 μg/m3 (80) | 80.0 | |
| March 20, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 1.0 ppb (1) | 0.81 ppb (9) | N/A | 20.1 μg/m3 (67) | 67.0 | |
| March 20, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 1.0 ppb (1) | 0.51 ppb (6) | N/A | 18.2 μg/m3 (63) | 63.0 | |
| March 20, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 8.0 ppb (6) | 0.33 ppb (4) | N/A | 16.4 μg/m3 (59) | 59.0 | |
| March 20, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 6.0 ppb (5) | 0.33 ppb (4) | N/A | 15.7 μg/m3 (58) | 58.0 | |
| March 20, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 8.0 ppb (6) | 0.3 ppb (3) | N/A | 14.6 μg/m3 (56) | 56.0 | |
| March 20, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 17.0 ppb (13) | 0.28 ppb (3) | N/A | 13.5 μg/m3 (53) | 53.0 | |
| March 20, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 12.0 ppb (9) | 0.3 ppb (3) | N/A | 12.6 μg/m3 (51) | 51.0 | |
| March 20, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 14.0 ppb (11) | 0.3 ppb (3) | N/A | 12.3 μg/m3 (51) | 51.0 | |
| March 20, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 2.0 ppb (2) | 0.45 ppb (5) | N/A | 15.7 μg/m3 (58) | 58.0 | |
| March 20, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 2.0 ppb (2) | 0.44 ppb (5) | N/A | 14.7 μg/m3 (56) | 56.0 | |
| March 20, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 15.0 ppb (12) | 0.43 ppb (5) | N/A | 9.6 μg/m3 (40) | 40.0 | |
| March 20, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 36.0 ppb (28) | 0.24 ppb (3) | N/A | 7.9 μg/m3 (33) | 33.0 | |
| March 19, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | 0.27 ppb (3) | N/A | 7.4 μg/m3 (31) | 31.0 | |
| March 19, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.24 ppb (3) | N/A | 7.5 μg/m3 (31) | 34.0 | |
| March 19, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.23 ppb (3) | N/A | 6.4 μg/m3 (27) | 35.0 | |
| March 19, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.23 ppb (3) | N/A | 6.0 μg/m3 (25) | 34.0 | |
| March 19, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.19 ppb (2) | N/A | 5.9 μg/m3 (25) | 35.0 | |
| March 19, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.16 ppb (2) | N/A | 5.4 μg/m3 (23) | 35.0 | |
| March 19, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.15 ppb (2) | N/A | 5.4 μg/m3 (23) | 33.0 | |
| March 19, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | 0.19 ppb (2) | N/A | 7.1 μg/m3 (30) | 30.0 | |
| March 19, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | 0.17 ppb (2) | N/A | 5.8 μg/m3 (24) | 31.0 | |
| March 19, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 39.0 ppb (30) | 0.18 ppb (2) | N/A | 5.1 μg/m3 (21) | 30.0 | |
| March 19, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.24 ppb (3) | N/A | 6.4 μg/m3 (27) | 27.0 | |
| March 19, 2019, noon | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 20.0 ppb (15) | 0.39 ppb (4) | N/A | 8.8 μg/m3 (37) | 37.0 | |
| March 19, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 6.0 ppb (5) | 0.5 ppb (6) | N/A | 10.6 μg/m3 (44) | 44.0 | |
| March 19, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 13.0 ppb (10) | 0.34 ppb (4) | N/A | 10.4 μg/m3 (43) | 43.0 | |
| March 19, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 18.0 ppb (14) | 0.26 ppb (3) | N/A | 12.3 μg/m3 (51) | 51.0 | |
| March 19, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 20.0 ppb (15) | 0.23 ppb (3) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| March 19, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 13.0 ppb (10) | 0.25 ppb (3) | N/A | 15.4 μg/m3 (57) | 57.0 | |
| March 19, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 23.0 ppb (18) | 0.25 ppb (3) | N/A | 17.2 μg/m3 (61) | 61.0 | |
| March 19, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 21.0 ppb (16) | 0.26 ppb (3) | N/A | 15.3 μg/m3 (57) | 57.0 | |
| March 19, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 13.0 ppb (10) | 0.33 ppb (4) | N/A | 15.4 μg/m3 (57) | 57.0 | |
| March 19, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 8.0 ppb (6) | 0.4 ppb (4) | N/A | 15.7 μg/m3 (58) | 58.0 | |
| March 19, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 9.0 ppb (7) | 0.39 ppb (4) | N/A | 13.5 μg/m3 (53) | 53.0 | |
| March 19, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 21.0 ppb (16) | 0.37 ppb (4) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| March 19, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 26.0 ppb (20) | 0.33 ppb (4) | N/A | 12.5 μg/m3 (51) | 51.0 | |
| March 18, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 31.0 ppb (24) | 0.25 ppb (3) | N/A | 10.2 μg/m3 (42) | 42.0 | |
| March 18, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.25 ppb (3) | N/A | 9.7 μg/m3 (40) | 40.0 | |
| March 18, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 36.0 ppb (28) | 0.28 ppb (3) | N/A | 9.2 μg/m3 (38) | 38.0 | |
| March 18, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.27 ppb (3) | N/A | 7.5 μg/m3 (31) | 31.0 |