St. Louis (Buchanan St) MO, US: 38.656449, -90.198548
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 23, 2019, 7 p.m. | 4.7 ppb (4) | 0.8 ppb (1) | 8.3 ppb (8) | 4.0 ppb (4) | N/A | 3.0 ppb (4) | 51.0 ppb (39) | 0.2 ppb (2) | N/A | 11.5 μg/m3 (48) | 48.0 | |
| March 23, 2019, 6 p.m. | 5.7 ppb (5) | 1.6 ppb (1) | 9.4 ppb (9) | 4.0 ppb (4) | N/A | 3.0 ppb (4) | 50.0 ppb (38) | 0.21 ppb (2) | N/A | 7.5 μg/m3 (31) | 38.0 | |
| March 23, 2019, 5 p.m. | 6.1 ppb (6) | 1.7 ppb (2) | 9.2 ppb (9) | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 46.0 ppb (35) | 0.2 ppb (2) | N/A | 5.6 μg/m3 (23) | 35.0 | |
| March 23, 2019, 4 p.m. | 7.7 ppb (7) | 2.6 ppb (2) | 11.0 ppb (10) | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 42.0 ppb (32) | 0.2 ppb (2) | N/A | 5.5 μg/m3 (23) | 32.0 | |
| March 23, 2019, 3 p.m. | 10.7 ppb (10) | 3.4 ppb (3) | 13.4 ppb (12) | 7.0 ppb (6) | N/A | 1.0 ppb (1) | 38.0 ppb (29) | 0.21 ppb (2) | N/A | 5.3 μg/m3 (22) | 29.0 | |
| March 23, 2019, 2 p.m. | 9.7 ppb (9) | 3.0 ppb (3) | 13.0 ppb (12) | 7.0 ppb (6) | N/A | 0.0 ppb (0) | 36.0 ppb (28) | 0.21 ppb (2) | N/A | 5.2 μg/m3 (22) | 28.0 | |
| March 23, 2019, 1 p.m. | 21.6 ppb (20) | 6.1 ppb (6) | 24.7 ppb (23) | 16.0 ppb (15) | N/A | 0.0 ppb (0) | 26.0 ppb (20) | 0.23 ppb (3) | N/A | 7.6 μg/m3 (32) | 32.0 | |
| March 23, 2019, noon | 35.8 ppb (33) | 8.1 ppb (8) | 37.6 ppb (35) | 28.0 ppb (26) | N/A | 0.0 ppb (0) | 15.0 ppb (12) | 0.26 ppb (3) | N/A | 9.1 μg/m3 (38) | 38.0 | |
| March 23, 2019, 11 a.m. | 43.3 ppb (40) | 8.3 ppb (8) | 46.4 ppb (43) | 35.0 ppb (32) | N/A | 0.0 ppb (0) | 8.0 ppb (6) | N/A | N/A | 11.1 μg/m3 (46) | 46.0 | |
| March 23, 2019, 10 a.m. | 27.5 ppb (25) | 1.6 ppb (1) | 30.7 ppb (28) | 26.0 ppb (24) | N/A | 0.0 ppb (0) | 16.0 ppb (12) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 23, 2019, 9 a.m. | 28.5 ppb (26) | 1.0 ppb (1) | 29.2 ppb (27) | 27.0 ppb (25) | N/A | 0.0 ppb (0) | 16.0 ppb (12) | 0.32 ppb (4) | N/A | 6.7 μg/m3 (28) | 28.0 | |
| March 23, 2019, 8 a.m. | 33.1 ppb (31) | 2.1 ppb (2) | 36.7 ppb (34) | 31.0 ppb (29) | N/A | 0.0 ppb (0) | 11.0 ppb (8) | 0.28 ppb (3) | N/A | 8.8 μg/m3 (37) | 37.0 | |
| March 23, 2019, 7 a.m. | 23.1 ppb (21) | 0.6 ppb (1) | 24.0 ppb (22) | 23.0 ppb (21) | N/A | 0.0 ppb (0) | 22.0 ppb (17) | 0.33 ppb (4) | N/A | 4.7 μg/m3 (20) | 22.0 | |
| March 23, 2019, 6 a.m. | 20.4 ppb (19) | 0.8 ppb (1) | 22.6 ppb (21) | 20.0 ppb (19) | N/A | 0.0 ppb (0) | 27.0 ppb (21) | 0.3 ppb (3) | N/A | 9.1 μg/m3 (38) | 38.0 | |
| March 23, 2019, 5 a.m. | 17.5 ppb (16) | 0.7 ppb (1) | 19.3 ppb (18) | 17.0 ppb (16) | N/A | 0.0 ppb (0) | 30.0 ppb (23) | 0.34 ppb (4) | N/A | 10.2 μg/m3 (42) | 42.0 | |
| March 23, 2019, 4 a.m. | 24.2 ppb (22) | 1.4 ppb (1) | 26.2 ppb (24) | 23.0 ppb (21) | N/A | 0.0 ppb (0) | 25.0 ppb (19) | 0.32 ppb (4) | N/A | 8.9 μg/m3 (37) | 37.0 | |
| March 23, 2019, 3 a.m. | 24.3 ppb (23) | 2.0 ppb (2) | 26.8 ppb (25) | 22.0 ppb (20) | N/A | 0.0 ppb (0) | 26.0 ppb (20) | 0.33 ppb (4) | N/A | 10.3 μg/m3 (43) | 43.0 | |
| March 23, 2019, 2 a.m. | 27.4 ppb (25) | 2.2 ppb (2) | 27.8 ppb (26) | 25.0 ppb (23) | N/A | 1.0 ppb (1) | 25.0 ppb (19) | 0.34 ppb (4) | N/A | 9.6 μg/m3 (40) | 40.0 | |
| March 23, 2019, 1 a.m. | 26.4 ppb (24) | 0.9 ppb (1) | 28.6 ppb (26) | 26.0 ppb (24) | N/A | 0.0 ppb (0) | 26.0 ppb (20) | 0.31 ppb (3) | N/A | 7.3 μg/m3 (30) | 30.0 | |
| March 23, 2019, midnight | 15.9 ppb (15) | 0.4 ppb (0) | 18.1 ppb (17) | 16.0 ppb (15) | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.23 ppb (3) | N/A | 7.5 μg/m3 (31) | 31.0 | |
| March 22, 2019, 11 p.m. | 9.1 ppb (8) | 0.7 ppb (1) | 11.9 ppb (11) | 8.0 ppb (7) | N/A | 0.0 ppb (0) | 46.0 ppb (35) | 0.21 ppb (2) | N/A | 5.2 μg/m3 (22) | 35.0 | |
| March 22, 2019, 10 p.m. | 6.6 ppb (6) | 1.2 ppb (1) | 9.1 ppb (8) | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.2 ppb (2) | N/A | 4.7 μg/m3 (20) | 38.0 | |
| March 22, 2019, 9 p.m. | 6.1 ppb (6) | 1.3 ppb (1) | 9.1 ppb (8) | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 50.0 ppb (38) | 0.18 ppb (2) | N/A | 3.1 μg/m3 (13) | 38.0 | |
| March 22, 2019, 8 p.m. | 5.1 ppb (5) | 1.9 ppb (2) | 5.8 ppb (5) | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 50.0 ppb (38) | 0.23 ppb (3) | N/A | 2.0 μg/m3 (8) | 38.0 | |
| March 22, 2019, 7 p.m. | 3.1 ppb (3) | 1.1 ppb (1) | 5.0 ppb (5) | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 51.0 ppb (39) | 0.2 ppb (2) | N/A | 9.5 μg/m3 (40) | 40.0 | |
| March 22, 2019, 6 p.m. | 4.8 ppb (4) | 1.4 ppb (1) | 6.3 ppb (6) | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.21 ppb (2) | N/A | 6.9 μg/m3 (29) | 38.0 | |
| March 22, 2019, 5 p.m. | 2.6 ppb (2) | 0.7 ppb (1) | 4.9 ppb (5) | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.18 ppb (2) | N/A | 7.5 μg/m3 (31) | 36.0 | |
| March 22, 2019, 4 p.m. | 7.2 ppb (7) | 6.9 ppb (6) | 6.7 ppb (6) | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.21 ppb (2) | N/A | 4.6 μg/m3 (19) | 34.0 | |
| March 22, 2019, 3 p.m. | 8.4 ppb (8) | 3.7 ppb (3) | 11.0 ppb (10) | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 40.0 ppb (31) | 0.25 ppb (3) | N/A | 8.4 μg/m3 (35) | 35.0 | |
| March 22, 2019, 2 p.m. | 8.9 ppb (8) | 3.5 ppb (3) | 10.8 ppb (10) | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.22 ppb (2) | N/A | 10.6 μg/m3 (44) | 44.0 | |
| March 22, 2019, 1 p.m. | 16.3 ppb (15) | 6.1 ppb (6) | 16.0 ppb (15) | 10.0 ppb (9) | N/A | 0.0 ppb (0) | 32.0 ppb (25) | 0.3 ppb (3) | N/A | 7.9 μg/m3 (33) | 33.0 | |
| March 22, 2019, noon | 25.4 ppb (24) | 8.4 ppb (8) | 22.5 ppb (21) | 17.0 ppb (16) | N/A | 0.0 ppb (0) | 27.0 ppb (21) | 0.32 ppb (4) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 22, 2019, 11 a.m. | 16.9 ppb (16) | 6.8 ppb (6) | 16.6 ppb (15) | 10.0 ppb (9) | N/A | N/A | 30.0 ppb (23) | 0.31 ppb (3) | N/A | 5.5 μg/m3 (23) | 23.0 | |
| March 22, 2019, 10 a.m. | 7.3 ppb (7) | 0.7 ppb (1) | 8.5 ppb (8) | 7.0 ppb (6) | N/A | N/A | 35.0 ppb (27) | 0.2 ppb (2) | N/A | 3.6 μg/m3 (15) | 27.0 | |
| March 22, 2019, 9 a.m. | 6.9 ppb (6) | 0.1 ppb (0) | 8.3 ppb (8) | 7.0 ppb (6) | N/A | 0.0 ppb (0) | 34.0 ppb (26) | 0.19 ppb (2) | N/A | 2.8 μg/m3 (12) | 26.0 | |
| March 22, 2019, 8 a.m. | 7.0 ppb (6) | 0.2 ppb (0) | 8.1 ppb (8) | 7.0 ppb (6) | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.19 ppb (2) | N/A | 3.3 μg/m3 (14) | 27.0 | |
| March 22, 2019, 7 a.m. | 10.0 ppb (9) | 0.4 ppb (0) | 11.2 ppb (10) | 10.0 ppb (9) | N/A | 0.0 ppb (0) | 33.0 ppb (25) | 0.2 ppb (2) | N/A | 6.2 μg/m3 (26) | 26.0 | |
| March 22, 2019, 6 a.m. | 10.5 ppb (10) | 0.1 ppb (0) | 12.5 ppb (12) | 11.0 ppb (10) | N/A | 0.0 ppb (0) | 33.0 ppb (25) | 0.23 ppb (3) | N/A | 5.0 μg/m3 (21) | 25.0 | |
| March 22, 2019, 5 a.m. | 15.4 ppb (14) | 0.6 ppb (1) | 17.0 ppb (16) | 15.0 ppb (14) | N/A | 0.0 ppb (0) | 30.0 ppb (23) | 0.28 ppb (3) | N/A | 6.1 μg/m3 (25) | 25.0 | |
| March 22, 2019, 4 a.m. | 32.9 ppb (30) | 2.5 ppb (2) | 31.2 ppb (29) | 30.0 ppb (28) | N/A | 0.0 ppb (0) | 15.0 ppb (12) | 0.5 ppb (6) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| March 22, 2019, 3 a.m. | 31.9 ppb (30) | 1.6 ppb (1) | 29.7 ppb (28) | 30.0 ppb (28) | N/A | 0.0 ppb (0) | 13.0 ppb (10) | 0.51 ppb (6) | N/A | 9.4 μg/m3 (39) | 39.0 | |
| March 22, 2019, 2 a.m. | 25.0 ppb (23) | 0.9 ppb (1) | 25.5 ppb (24) | 24.0 ppb (22) | N/A | 0.0 ppb (0) | 20.0 ppb (15) | 0.46 ppb (5) | N/A | 9.7 μg/m3 (40) | 40.0 | |
| March 22, 2019, 1 a.m. | 16.4 ppb (15) | 0.2 ppb (0) | 17.6 ppb (16) | 16.0 ppb (15) | N/A | 0.0 ppb (0) | 30.0 ppb (23) | 0.35 ppb (4) | N/A | 6.9 μg/m3 (29) | 29.0 | |
| March 22, 2019, midnight | 6.6 ppb (6) | 0.2 ppb (0) | 8.0 ppb (7) | 7.0 ppb (6) | N/A | 0.0 ppb (0) | 41.0 ppb (32) | 0.23 ppb (3) | N/A | 1.4 μg/m3 (6) | 32.0 | |
| March 21, 2019, 11 p.m. | 2.2 ppb (2) | 0.2 ppb (0) | 3.7 ppb (3) | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.18 ppb (2) | N/A | 5.6 μg/m3 (23) | 37.0 | |
| March 21, 2019, 10 p.m. | 1.7 ppb (2) | 0.2 ppb (0) | 3.6 ppb (3) | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.18 ppb (2) | N/A | 2.0 μg/m3 (8) | 38.0 | |
| March 21, 2019, 9 p.m. | 2.4 ppb (2) | 0.2 ppb (0) | 3.7 ppb (3) | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.18 ppb (2) | N/A | 4.6 μg/m3 (19) | 38.0 | |
| March 21, 2019, 8 p.m. | 4.4 ppb (4) | 2.4 ppb (2) | 6.2 ppb (6) | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.21 ppb (2) | N/A | 5.2 μg/m3 (22) | 37.0 | |
| March 21, 2019, 7 p.m. | 7.6 ppb (7) | 3.4 ppb (3) | 8.8 ppb (8) | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.21 ppb (2) | N/A | 6.3 μg/m3 (26) | 36.0 | |
| March 21, 2019, 6 p.m. | 3.5 ppb (3) | 1.2 ppb (1) | 5.3 ppb (5) | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.22 ppb (2) | N/A | 7.8 μg/m3 (32) | 36.0 | |
| March 21, 2019, 5 p.m. | 3.6 ppb (3) | 1.1 ppb (1) | 4.6 ppb (4) | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.2 ppb (2) | N/A | 5.1 μg/m3 (21) | 36.0 | |
| March 21, 2019, 4 p.m. | 5.4 ppb (5) | 2.4 ppb (2) | 7.7 ppb (7) | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.23 ppb (3) | N/A | 7.0 μg/m3 (29) | 35.0 | |
| March 21, 2019, 3 p.m. | 4.6 ppb (4) | 1.9 ppb (2) | 7.2 ppb (7) | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 46.0 ppb (35) | 0.23 ppb (3) | N/A | 9.6 μg/m3 (40) | 40.0 | |
| March 21, 2019, 2 p.m. | 5.0 ppb (5) | 1.8 ppb (2) | 7.9 ppb (7) | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.2 ppb (2) | N/A | 10.6 μg/m3 (44) | 44.0 | |
| March 21, 2019, 1 p.m. | 7.1 ppb (7) | 1.9 ppb (2) | 9.8 ppb (9) | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 41.0 ppb (32) | 0.23 ppb (3) | N/A | 6.5 μg/m3 (27) | 32.0 | |
| March 21, 2019, noon | 7.7 ppb (7) | 1.6 ppb (1) | 9.1 ppb (8) | 6.0 ppb (6) | N/A | 0.0 ppb (0) | 39.0 ppb (30) | 0.23 ppb (3) | N/A | 10.8 μg/m3 (45) | 45.0 | |
| March 21, 2019, 11 a.m. | 7.3 ppb (7) | 0.8 ppb (1) | 8.7 ppb (8) | 7.0 ppb (6) | N/A | 0.0 ppb (0) | 39.0 ppb (30) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 21, 2019, 10 a.m. | 3.5 ppb (3) | 0.1 ppb (0) | 5.6 ppb (5) | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 42.0 ppb (32) | N/A | N/A | 4.3 μg/m3 (18) | 32.0 | |
| March 21, 2019, 9 a.m. | 1.9 ppb (2) | 0.1 ppb (0) | 3.8 ppb (4) | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 40.0 ppb (31) | 0.16 ppb (2) | N/A | 4.3 μg/m3 (18) | 31.0 | |
| March 21, 2019, 8 a.m. | 5.6 ppb (5) | 0.4 ppb (0) | 7.4 ppb (7) | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.19 ppb (2) | N/A | 7.9 μg/m3 (33) | 33.0 | |
| March 21, 2019, 7 a.m. | 7.9 ppb (7) | 0.5 ppb (0) | 9.6 ppb (9) | 7.0 ppb (6) | N/A | 0.0 ppb (0) | 33.0 ppb (25) | 0.22 ppb (2) | N/A | 10.1 μg/m3 (42) | 42.0 | |
| March 21, 2019, 6 a.m. | 8.6 ppb (8) | 0.1 ppb (0) | 10.8 ppb (10) | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 34.0 ppb (26) | 0.23 ppb (3) | N/A | 8.5 μg/m3 (35) | 35.0 | |
| March 21, 2019, 5 a.m. | 8.4 ppb (8) | 0.2 ppb (0) | 10.7 ppb (10) | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 35.0 ppb (27) | 0.24 ppb (3) | N/A | 10.6 μg/m3 (44) | 44.0 | |
| March 21, 2019, 4 a.m. | 9.1 ppb (8) | 0.1 ppb (0) | 11.6 ppb (11) | 9.0 ppb (8) | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.28 ppb (3) | N/A | 7.7 μg/m3 (32) | 32.0 | |
| March 21, 2019, 3 a.m. | 11.1 ppb (10) | 0.2 ppb (0) | 13.4 ppb (12) | 11.0 ppb (10) | N/A | 0.0 ppb (0) | 33.0 ppb (25) | 0.34 ppb (4) | N/A | 9.9 μg/m3 (41) | 41.0 | |
| March 21, 2019, 2 a.m. | 12.1 ppb (11) | 0.2 ppb (0) | 13.2 ppb (12) | 12.0 ppb (11) | N/A | 1.0 ppb (1) | 32.0 ppb (25) | 0.48 ppb (5) | N/A | 9.8 μg/m3 (41) | 41.0 | |
| March 21, 2019, 1 a.m. | 13.1 ppb (12) | 0.7 ppb (1) | 13.9 ppb (13) | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 33.0 ppb (25) | 0.29 ppb (3) | N/A | 9.2 μg/m3 (38) | 38.0 | |
| March 21, 2019, midnight | 6.4 ppb (6) | 0.3 ppb (0) | 8.2 ppb (8) | 6.0 ppb (6) | N/A | 0.0 ppb (0) | 41.0 ppb (32) | 0.25 ppb (3) | N/A | 3.9 μg/m3 (16) | 32.0 | |
| March 20, 2019, 11 p.m. | 3.6 ppb (3) | 0.1 ppb (0) | 5.6 ppb (5) | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.23 ppb (3) | N/A | 8.0 μg/m3 (33) | 35.0 | |
| March 20, 2019, 10 p.m. | 4.1 ppb (4) | 0.2 ppb (0) | 6.0 ppb (6) | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.22 ppb (2) | N/A | 10.1 μg/m3 (42) | 42.0 | |
| March 20, 2019, 9 p.m. | 3.4 ppb (3) | 0.2 ppb (0) | 5.4 ppb (5) | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.22 ppb (2) | N/A | 12.2 μg/m3 (50) | 50.0 | |
| March 20, 2019, 8 p.m. | 5.6 ppb (5) | 1.5 ppb (1) | 6.5 ppb (6) | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.24 ppb (3) | N/A | 10.1 μg/m3 (42) | 42.0 | |
| March 20, 2019, 7 p.m. | 3.7 ppb (3) | 0.8 ppb (1) | 6.3 ppb (6) | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.25 ppb (3) | N/A | 11.9 μg/m3 (50) | 50.0 | |
| March 20, 2019, 6 p.m. | 5.9 ppb (5) | 1.3 ppb (1) | 8.2 ppb (8) | 5.0 ppb (5) | N/A | 3.0 ppb (4) | 43.0 ppb (33) | 0.28 ppb (3) | N/A | 18.9 μg/m3 (65) | 65.0 | |
| March 20, 2019, 5 p.m. | 7.7 ppb (7) | 2.9 ppb (3) | 6.9 ppb (6) | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 46.0 ppb (35) | 0.24 ppb (3) | N/A | 19.4 μg/m3 (66) | 66.0 | |
| March 20, 2019, 4 p.m. | 6.3 ppb (6) | 1.6 ppb (1) | 7.9 ppb (7) | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.27 ppb (3) | N/A | 17.3 μg/m3 (61) | 61.0 | |
| March 20, 2019, 3 p.m. | 11.0 ppb (10) | 1.8 ppb (2) | 13.3 ppb (12) | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 43.0 ppb (33) | 0.25 ppb (3) | N/A | 10.7 μg/m3 (45) | 45.0 | |
| March 20, 2019, 2 p.m. | 15.6 ppb (14) | 2.9 ppb (3) | 18.5 ppb (17) | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 38.0 ppb (29) | 0.25 ppb (3) | N/A | 11.3 μg/m3 (47) | 47.0 | |
| March 20, 2019, 1 p.m. | 20.5 ppb (19) | 2.5 ppb (2) | 23.5 ppb (22) | 18.0 ppb (17) | N/A | 1.0 ppb (1) | 32.0 ppb (25) | 0.25 ppb (3) | N/A | 6.7 μg/m3 (28) | 28.0 | |
| March 20, 2019, noon | 20.1 ppb (19) | 2.0 ppb (2) | 21.5 ppb (20) | 18.0 ppb (17) | N/A | 2.0 ppb (3) | 31.0 ppb (24) | 0.25 ppb (3) | N/A | 11.4 μg/m3 (48) | 48.0 | |
| March 20, 2019, 11 a.m. | 14.9 ppb (14) | 0.6 ppb (1) | 17.4 ppb (16) | 14.0 ppb (13) | N/A | N/A | 35.0 ppb (27) | 0.23 ppb (3) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 20, 2019, 10 a.m. | 9.1 ppb (8) | 0.1 ppb (0) | 11.4 ppb (11) | 9.0 ppb (8) | N/A | N/A | 41.0 ppb (32) | 0.2 ppb (2) | N/A | 11.4 μg/m3 (48) | 48.0 | |
| March 20, 2019, 9 a.m. | 5.8 ppb (5) | 0.1 ppb (0) | 8.1 ppb (8) | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 45.0 ppb (35) | 0.19 ppb (2) | N/A | 13.1 μg/m3 (52) | 52.0 | |
| March 20, 2019, 8 a.m. | 7.2 ppb (7) | 0.1 ppb (0) | 9.6 ppb (9) | 7.0 ppb (6) | N/A | 3.0 ppb (4) | 44.0 ppb (34) | 0.19 ppb (2) | N/A | 13.5 μg/m3 (53) | 53.0 | |
| March 20, 2019, 7 a.m. | 4.7 ppb (4) | 0.1 ppb (0) | 7.0 ppb (6) | 5.0 ppb (5) | N/A | 3.0 ppb (4) | 46.0 ppb (35) | 0.19 ppb (2) | N/A | 8.4 μg/m3 (35) | 35.0 | |
| March 20, 2019, 6 a.m. | 9.3 ppb (9) | 0.1 ppb (0) | 11.8 ppb (11) | 9.0 ppb (8) | N/A | 2.0 ppb (3) | 43.0 ppb (33) | 0.19 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 20, 2019, 5 a.m. | 9.2 ppb (9) | 0.1 ppb (0) | 11.9 ppb (11) | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 42.0 ppb (32) | 0.2 ppb (2) | N/A | 10.4 μg/m3 (43) | 43.0 | |
| March 20, 2019, 4 a.m. | 10.1 ppb (9) | 0.2 ppb (0) | 12.5 ppb (12) | 10.0 ppb (9) | N/A | 1.0 ppb (1) | 42.0 ppb (32) | 0.21 ppb (2) | N/A | 7.4 μg/m3 (31) | 32.0 | |
| March 20, 2019, 3 a.m. | 7.4 ppb (7) | 0.2 ppb (0) | 9.8 ppb (9) | 7.0 ppb (6) | N/A | 2.0 ppb (3) | 45.0 ppb (35) | 0.23 ppb (3) | N/A | 6.7 μg/m3 (28) | 35.0 | |
| March 20, 2019, 2 a.m. | 13.0 ppb (12) | 0.3 ppb (0) | 15.9 ppb (15) | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 42.0 ppb (32) | 0.23 ppb (3) | N/A | 9.8 μg/m3 (41) | 41.0 | |
| March 20, 2019, 1 a.m. | 20.6 ppb (19) | 0.6 ppb (1) | 23.0 ppb (21) | 20.0 ppb (19) | N/A | 1.0 ppb (1) | 34.0 ppb (26) | 0.31 ppb (3) | N/A | 14.6 μg/m3 (56) | 56.0 | |
| March 20, 2019, midnight | 22.5 ppb (21) | 0.7 ppb (1) | 26.4 ppb (24) | 22.0 ppb (20) | N/A | 1.0 ppb (1) | 33.0 ppb (25) | 0.29 ppb (3) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 19, 2019, 11 p.m. | 16.4 ppb (15) | 1.8 ppb (2) | 19.6 ppb (18) | 15.0 ppb (14) | N/A | 1.0 ppb (1) | 41.0 ppb (32) | 0.23 ppb (3) | N/A | 7.1 μg/m3 (30) | 32.0 | |
| March 19, 2019, 10 p.m. | 10.3 ppb (10) | 1.2 ppb (1) | 12.9 ppb (12) | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 46.0 ppb (35) | 0.23 ppb (3) | N/A | 6.3 μg/m3 (26) | 35.0 | |
| March 19, 2019, 9 p.m. | 18.2 ppb (17) | 3.6 ppb (3) | 18.9 ppb (18) | 15.0 ppb (14) | N/A | 2.0 ppb (3) | 44.0 ppb (34) | 0.24 ppb (3) | N/A | 12.1 μg/m3 (50) | 50.0 | |
| March 19, 2019, 8 p.m. | 10.2 ppb (9) | 2.1 ppb (2) | 14.0 ppb (13) | 8.0 ppb (7) | N/A | 2.0 ppb (3) | 46.0 ppb (35) | 0.21 ppb (2) | N/A | 7.3 μg/m3 (30) | 35.0 | |
| March 19, 2019, 7 p.m. | 9.4 ppb (9) | 2.1 ppb (2) | 11.3 ppb (10) | 7.0 ppb (6) | N/A | 2.0 ppb (3) | 46.0 ppb (35) | 0.21 ppb (2) | N/A | 5.2 μg/m3 (22) | 35.0 | |
| March 19, 2019, 6 p.m. | 7.3 ppb (7) | 1.7 ppb (2) | 9.8 ppb (9) | 6.0 ppb (6) | N/A | 2.0 ppb (3) | 47.0 ppb (36) | 0.2 ppb (2) | N/A | 7.5 μg/m3 (31) | 36.0 | |
| March 19, 2019, 5 p.m. | 6.2 ppb (6) | 2.0 ppb (2) | 9.5 ppb (9) | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 47.0 ppb (36) | 0.2 ppb (2) | N/A | 7.0 μg/m3 (29) | 36.0 | |
| March 19, 2019, 4 p.m. | 8.8 ppb (8) | 2.5 ppb (2) | 10.9 ppb (10) | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 44.0 ppb (34) | 0.2 ppb (2) | N/A | 0.0 μg/m3 (0) | 34.0 | |
| March 19, 2019, 3 p.m. | 12.8 ppb (12) | 3.6 ppb (3) | 16.3 ppb (15) | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 38.0 ppb (29) | 0.23 ppb (3) | N/A | N/A | 29.0 | |
| March 19, 2019, 2 p.m. | 24.4 ppb (23) | 7.4 ppb (7) | 29.4 ppb (27) | 17.0 ppb (16) | N/A | 1.0 ppb (1) | 31.0 ppb (24) | 0.24 ppb (3) | N/A | 10.4 μg/m3 (43) | 43.0 | |
| March 19, 2019, 1 p.m. | 49.0 ppb (45) | 14.7 ppb (14) | 52.8 ppb (49) | 34.0 ppb (31) | N/A | 1.0 ppb (1) | 17.0 ppb (13) | 0.32 ppb (4) | N/A | 10.4 μg/m3 (43) | 49.0 | |
| March 19, 2019, noon | 68.4 ppb (65) | 26.9 ppb (25) | 73.3 ppb (71) | 41.0 ppb (38) | N/A | 1.0 ppb (1) | 9.0 ppb (7) | 0.42 ppb (5) | N/A | 15.9 μg/m3 (58) | 71.0 | |
| March 19, 2019, 11 a.m. | 54.5 ppb (51) | 15.4 ppb (14) | 59.0 ppb (55) | 39.0 ppb (36) | N/A | 1.0 ppb (1) | 10.0 ppb (8) | N/A | N/A | 10.7 μg/m3 (45) | 55.0 | |
| March 19, 2019, 10 a.m. | 32.1 ppb (30) | 1.3 ppb (1) | 35.4 ppb (33) | 31.0 ppb (29) | N/A | 1.0 ppb (1) | 17.0 ppb (13) | N/A | N/A | 9.8 μg/m3 (41) | 41.0 | |
| March 19, 2019, 9 a.m. | 24.4 ppb (23) | 0.3 ppb (0) | 26.9 ppb (25) | 24.0 ppb (22) | N/A | 1.0 ppb (1) | 23.0 ppb (18) | 0.23 ppb (3) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 19, 2019, 8 a.m. | 27.9 ppb (26) | 0.2 ppb (0) | 30.8 ppb (29) | 28.0 ppb (26) | N/A | 0.0 ppb (0) | 19.0 ppb (15) | 0.24 ppb (3) | N/A | 7.6 μg/m3 (32) | 32.0 | |
| March 19, 2019, 7 a.m. | 36.4 ppb (34) | 2.0 ppb (2) | 37.6 ppb (35) | 34.0 ppb (31) | N/A | 0.0 ppb (0) | 13.0 ppb (10) | 0.27 ppb (3) | N/A | 7.9 μg/m3 (33) | 35.0 | |
| March 19, 2019, 6 a.m. | 39.2 ppb (36) | 4.9 ppb (5) | 41.5 ppb (38) | 34.0 ppb (31) | N/A | 0.0 ppb (0) | 14.0 ppb (11) | 0.31 ppb (3) | N/A | 5.7 μg/m3 (24) | 38.0 | |
| March 19, 2019, 5 a.m. | 32.6 ppb (30) | 3.6 ppb (3) | 32.7 ppb (30) | 29.0 ppb (27) | N/A | 0.0 ppb (0) | 18.0 ppb (14) | 0.32 ppb (4) | N/A | 8.7 μg/m3 (36) | 36.0 | |
| March 19, 2019, 4 a.m. | 34.8 ppb (32) | 3.9 ppb (4) | 38.6 ppb (36) | 31.0 ppb (29) | N/A | 0.0 ppb (0) | 17.0 ppb (13) | 0.33 ppb (4) | N/A | 11.7 μg/m3 (49) | 49.0 | |
| March 19, 2019, 3 a.m. | 43.1 ppb (40) | 3.4 ppb (3) | 46.6 ppb (43) | 40.0 ppb (37) | N/A | 1.0 ppb (1) | 10.0 ppb (8) | 0.36 ppb (4) | N/A | 14.9 μg/m3 (56) | 56.0 | |
| March 19, 2019, 2 a.m. | 34.5 ppb (32) | 3.2 ppb (3) | 36.4 ppb (34) | 31.0 ppb (29) | N/A | 0.0 ppb (0) | 17.0 ppb (13) | 0.32 ppb (4) | N/A | 7.2 μg/m3 (30) | 34.0 | |
| March 19, 2019, 1 a.m. | 29.0 ppb (27) | 2.5 ppb (2) | 30.5 ppb (28) | 27.0 ppb (25) | N/A | 0.0 ppb (0) | 25.0 ppb (19) | 0.29 ppb (3) | N/A | 7.5 μg/m3 (31) | 31.0 | |
| March 19, 2019, midnight | 16.1 ppb (15) | 0.9 ppb (1) | 18.5 ppb (17) | 15.0 ppb (14) | N/A | 1.0 ppb (1) | 36.0 ppb (28) | 0.24 ppb (3) | N/A | 6.0 μg/m3 (25) | 28.0 | |
| March 18, 2019, 11 p.m. | 6.5 ppb (6) | 0.6 ppb (1) | 8.5 ppb (8) | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 46.0 ppb (35) | 0.19 ppb (2) | N/A | 6.4 μg/m3 (27) | 35.0 | |
| March 18, 2019, 10 p.m. | 4.6 ppb (4) | 0.8 ppb (1) | 6.4 ppb (6) | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 49.0 ppb (38) | 0.18 ppb (2) | N/A | 2.3 μg/m3 (10) | 38.0 | |
| March 18, 2019, 9 p.m. | 6.3 ppb (6) | 1.7 ppb (2) | 8.1 ppb (8) | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.18 ppb (2) | N/A | 4.7 μg/m3 (20) | 37.0 | |
| March 18, 2019, 8 p.m. | 9.0 ppb (8) | 3.5 ppb (3) | 10.6 ppb (10) | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.2 ppb (2) | N/A | 6.6 μg/m3 (28) | 36.0 | |
| March 18, 2019, 7 p.m. | 7.2 ppb (7) | 2.6 ppb (2) | 9.1 ppb (8) | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 47.0 ppb (36) | 0.19 ppb (2) | N/A | 4.6 μg/m3 (19) | 36.0 | |
| March 18, 2019, 6 p.m. | 8.3 ppb (8) | 3.1 ppb (3) | 9.3 ppb (9) | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.2 ppb (2) | N/A | 6.8 μg/m3 (28) | 35.0 | |
| March 18, 2019, 5 p.m. | 13.0 ppb (12) | 4.6 ppb (4) | 16.1 ppb (15) | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 40.0 ppb (31) | 0.21 ppb (2) | N/A | 13.5 μg/m3 (53) | 53.0 | |
| March 18, 2019, 4 p.m. | 12.9 ppb (12) | 4.7 ppb (4) | 17.8 ppb (16) | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 38.0 ppb (29) | 0.21 ppb (2) | N/A | 10.9 μg/m3 (45) | 45.0 | |
| March 18, 2019, 3 p.m. | 13.7 ppb (13) | 5.8 ppb (5) | 16.7 ppb (15) | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 36.0 ppb (28) | 0.24 ppb (3) | N/A | 11.1 μg/m3 (46) | 46.0 | |
| March 18, 2019, 2 p.m. | 17.0 ppb (16) | 6.1 ppb (6) | 22.1 ppb (20) | 11.0 ppb (10) | N/A | 1.0 ppb (1) | 30.0 ppb (23) | 0.21 ppb (2) | N/A | 10.1 μg/m3 (42) | 42.0 | |
| March 18, 2019, 1 p.m. | 31.1 ppb (29) | 10.6 ppb (10) | 33.3 ppb (31) | 20.0 ppb (19) | N/A | 1.0 ppb (1) | 22.0 ppb (17) | 0.29 ppb (3) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 18, 2019, noon | 78.6 ppb (76) | 40.1 ppb (37) | 93.8 ppb (92) | 38.0 ppb (35) | N/A | 0.0 ppb (0) | 7.0 ppb (5) | 0.93 ppb (10) | N/A | 16.2 μg/m3 (59) | 92.0 | |
| March 18, 2019, 11 a.m. | 71.4 ppb (69) | 32.4 ppb (30) | 82.4 ppb (80) | 39.0 ppb (36) | N/A | N/A | 3.0 ppb (2) | 0.65 ppb (7) | N/A | 10.9 μg/m3 (45) | 80.0 | |
| March 18, 2019, 10 a.m. | 63.4 ppb (60) | 24.2 ppb (22) | 76.8 ppb (74) | 39.0 ppb (36) | N/A | N/A | 2.0 ppb (2) | 0.52 ppb (6) | N/A | 10.2 μg/m3 (42) | 74.0 | |
| March 18, 2019, 9 a.m. | 49.5 ppb (46) | 11.7 ppb (11) | 59.2 ppb (56) | 38.0 ppb (35) | N/A | 0.0 ppb (0) | 2.0 ppb (2) | 0.48 ppb (5) | N/A | 10.8 μg/m3 (45) | 56.0 | |
| March 18, 2019, 8 a.m. | 48.2 ppb (45) | 12.3 ppb (11) | 58.0 ppb (54) | 36.0 ppb (33) | N/A | 0.0 ppb (0) | 2.0 ppb (2) | 0.57 ppb (6) | N/A | 7.9 μg/m3 (33) | 54.0 | |
| March 18, 2019, 7 a.m. | 49.9 ppb (46) | 14.5 ppb (13) | 55.8 ppb (52) | 35.0 ppb (32) | N/A | 0.0 ppb (0) | 2.0 ppb (2) | 0.62 ppb (7) | N/A | 7.4 μg/m3 (31) | 52.0 | |
| March 18, 2019, 6 a.m. | 49.5 ppb (46) | 13.2 ppb (12) | 56.2 ppb (52) | 36.0 ppb (33) | N/A | 0.0 ppb (0) | 2.0 ppb (2) | 0.55 ppb (6) | N/A | 12.5 μg/m3 (51) | 52.0 | |
| March 18, 2019, 5 a.m. | 39.3 ppb (36) | 5.4 ppb (5) | 41.8 ppb (39) | 34.0 ppb (31) | N/A | 0.0 ppb (0) | 6.0 ppb (5) | 0.47 ppb (5) | N/A | 6.3 μg/m3 (26) | 39.0 | |
| March 18, 2019, 4 a.m. | 26.0 ppb (24) | 0.8 ppb (1) | 30.6 ppb (28) | 25.0 ppb (23) | N/A | 0.0 ppb (0) | 15.0 ppb (12) | 0.4 ppb (4) | N/A | 8.5 μg/m3 (35) | 35.0 | |
| March 18, 2019, 3 a.m. | 14.3 ppb (13) | 0.2 ppb (0) | 15.3 ppb (14) | 14.0 ppb (13) | N/A | 0.0 ppb (0) | 30.0 ppb (23) | 0.29 ppb (3) | N/A | 5.9 μg/m3 (25) | 25.0 | |
| March 18, 2019, 2 a.m. | 13.2 ppb (12) | 0.5 ppb (0) | 14.0 ppb (13) | 13.0 ppb (12) | N/A | 0.0 ppb (0) | 32.0 ppb (25) | 0.29 ppb (3) | N/A | 3.0 μg/m3 (12) | 25.0 | |
| March 18, 2019, 1 a.m. | 15.2 ppb (14) | 0.1 ppb (0) | 16.7 ppb (15) | 15.0 ppb (14) | N/A | 1.0 ppb (1) | 31.0 ppb (24) | 0.23 ppb (3) | N/A | 7.3 μg/m3 (30) | 30.0 | |
| March 18, 2019, midnight | 5.5 ppb (5) | 0.5 ppb (0) | 7.2 ppb (7) | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.19 ppb (2) | N/A | 4.9 μg/m3 (20) | 33.0 | |
| March 17, 2019, 11 p.m. | 1.9 ppb (2) | 0.1 ppb (0) | 3.5 ppb (3) | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.17 ppb (2) | N/A | 6.4 μg/m3 (27) | 37.0 | |
| March 17, 2019, 10 p.m. | 1.5 ppb (1) | 0.2 ppb (0) | 3.4 ppb (3) | 1.0 ppb (1) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.17 ppb (2) | N/A | 7.7 μg/m3 (32) | 37.0 | |
| March 17, 2019, 9 p.m. | 1.1 ppb (1) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.16 ppb (2) | N/A | 5.7 μg/m3 (24) | 38.0 | |
| March 17, 2019, 8 p.m. | 1.6 ppb (1) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.17 ppb (2) | N/A | 4.8 μg/m3 (20) | 37.0 | |
| March 17, 2019, 7 p.m. | 1.1 ppb (1) | 0.2 ppb (0) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | 46.0 ppb (35) | 0.17 ppb (2) | N/A | 3.4 μg/m3 (14) | 35.0 | |
| March 17, 2019, 6 p.m. | 2.1 ppb (2) | 0.4 ppb (0) | 3.7 ppb (3) | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 46.0 ppb (35) | 0.17 ppb (2) | N/A | 4.3 μg/m3 (18) | 35.0 | |
| March 17, 2019, 5 p.m. | 2.4 ppb (2) | 0.7 ppb (1) | 4.6 ppb (4) | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.17 ppb (2) | N/A | 1.5 μg/m3 (6) | 34.0 | |
| March 17, 2019, 4 p.m. | 1.5 ppb (1) | 0.4 ppb (0) | 3.9 ppb (4) | 1.0 ppb (1) | N/A | 0.0 ppb (0) | 41.0 ppb (32) | 0.17 ppb (2) | N/A | 6.9 μg/m3 (29) | 32.0 | |
| March 17, 2019, 3 p.m. | 1.5 ppb (1) | 0.3 ppb (0) | 3.7 ppb (3) | 1.0 ppb (1) | N/A | 0.0 ppb (0) | 38.0 ppb (29) | 0.17 ppb (2) | N/A | 4.7 μg/m3 (20) | 29.0 | |
| March 17, 2019, 2 p.m. | 2.2 ppb (2) | 0.4 ppb (0) | 4.4 ppb (4) | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.17 ppb (2) | N/A | 4.3 μg/m3 (18) | 28.0 | |
| March 17, 2019, 1 p.m. | 3.5 ppb (3) | 0.4 ppb (0) | 5.3 ppb (5) | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 38.0 ppb (29) | 0.17 ppb (2) | N/A | 3.3 μg/m3 (14) | 29.0 | |
| March 17, 2019, noon | 5.2 ppb (5) | 0.2 ppb (0) | 6.7 ppb (6) | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 36.0 ppb (28) | 0.19 ppb (2) | N/A | 3.7 μg/m3 (15) | 28.0 | |
| March 17, 2019, 11 a.m. | 5.9 ppb (5) | 0.2 ppb (0) | 7.2 ppb (7) | 6.0 ppb (6) | N/A | 0.0 ppb (0) | 35.0 ppb (27) | N/A | N/A | 4.3 μg/m3 (18) | 27.0 | |
| March 17, 2019, 10 a.m. | 9.0 ppb (8) | 0.2 ppb (0) | 9.9 ppb (9) | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 33.0 ppb (25) | N/A | N/A | 4.5 μg/m3 (19) | 25.0 | |
| March 17, 2019, 9 a.m. | 7.1 ppb (7) | 0.1 ppb (0) | 8.4 ppb (8) | 7.0 ppb (6) | N/A | 0.0 ppb (0) | 33.0 ppb (25) | 0.2 ppb (2) | N/A | 4.6 μg/m3 (19) | 25.0 | |
| March 17, 2019, 8 a.m. | 11.9 ppb (11) | 0.3 ppb (0) | 13.9 ppb (13) | 12.0 ppb (11) | N/A | 1.0 ppb (1) | 30.0 ppb (23) | 0.21 ppb (2) | N/A | 3.7 μg/m3 (15) | 23.0 | |
| March 17, 2019, 7 a.m. | 11.5 ppb (11) | 0.1 ppb (0) | 13.6 ppb (13) | 12.0 ppb (11) | N/A | 1.0 ppb (1) | 32.0 ppb (25) | 0.19 ppb (2) | N/A | 7.5 μg/m3 (31) | 31.0 | |
| March 17, 2019, 6 a.m. | 9.7 ppb (9) | 0.3 ppb (0) | 11.2 ppb (10) | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 36.0 ppb (28) | 0.19 ppb (2) | N/A | 6.1 μg/m3 (25) | 28.0 | |
| March 17, 2019, 5 a.m. | 15.0 ppb (14) | 0.2 ppb (0) | 16.4 ppb (15) | 15.0 ppb (14) | N/A | 0.0 ppb (0) | 31.0 ppb (24) | 0.2 ppb (2) | N/A | 5.4 μg/m3 (23) | 24.0 | |
| March 17, 2019, 4 a.m. | 7.3 ppb (7) | 0.1 ppb (0) | 8.9 ppb (8) | 7.0 ppb (6) | N/A | 1.0 ppb (1) | 38.0 ppb (29) | 0.2 ppb (2) | N/A | 5.4 μg/m3 (23) | 29.0 | |
| March 17, 2019, 3 a.m. | 23.2 ppb (21) | 0.3 ppb (0) | 25.4 ppb (24) | 23.0 ppb (21) | N/A | 1.0 ppb (1) | 28.0 ppb (22) | 0.24 ppb (3) | N/A | 9.1 μg/m3 (38) | 38.0 | |
| March 17, 2019, 2 a.m. | 26.5 ppb (25) | 0.8 ppb (1) | 27.6 ppb (26) | 26.0 ppb (24) | N/A | 1.0 ppb (1) | 23.0 ppb (18) | 0.35 ppb (4) | N/A | 8.6 μg/m3 (36) | 36.0 | |
| March 17, 2019, 1 a.m. | 34.5 ppb (32) | 2.1 ppb (2) | 38.1 ppb (35) | 32.0 ppb (30) | N/A | 0.0 ppb (0) | 13.0 ppb (10) | 0.36 ppb (4) | N/A | 6.2 μg/m3 (26) | 35.0 | |
| March 17, 2019, midnight | 8.4 ppb (8) | 0.2 ppb (0) | 11.0 ppb (10) | 8.0 ppb (7) | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.22 ppb (2) | N/A | 6.0 μg/m3 (25) | 28.0 | |
| March 16, 2019, 11 p.m. | 3.5 ppb (3) | 0.1 ppb (0) | 4.6 ppb (4) | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.19 ppb (2) | N/A | 2.7 μg/m3 (11) | 35.0 | |
| March 16, 2019, 10 p.m. | 1.9 ppb (2) | 0.2 ppb (0) | 3.3 ppb (3) | 2.0 ppb (2) | N/A | 0.0 ppb (0) | N/A | 0.16 ppb (2) | N/A | 1.5 μg/m3 (6) | 6.0 | |
| March 16, 2019, 9 p.m. | 1.8 ppb (2) | 0.5 ppb (0) | 3.0 ppb (3) | 1.0 ppb (1) | N/A | 0.0 ppb (0) | N/A | 0.17 ppb (2) | N/A | 2.7 μg/m3 (11) | 11.0 | |
| March 16, 2019, 8 p.m. | 1.4 ppb (1) | 0.3 ppb (0) | 2.6 ppb (2) | 1.0 ppb (1) | N/A | 0.0 ppb (0) | N/A | 0.15 ppb (2) | N/A | 4.7 μg/m3 (20) | 20.0 |