Santa Clarita CA, US: 34.3833, -118.5283
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| May 21, 2019, 1 a.m. | 4.1 ppb (4) | 1.1 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 46.0 ppb (35) | 0.12 ppb (1) | N/A | 1.4 μg/m3 (6) | 35.0 | |
| May 21, 2019, midnight | 3.6 ppb (3) | 1.1 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 48.0 ppb (37) | 0.11 ppb (1) | N/A | 1.4 μg/m3 (6) | 37.0 | |
| May 20, 2019, 11 p.m. | 2.4 ppb (2) | 0.7 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 50.0 ppb (38) | 0.11 ppb (1) | N/A | -0.7 μg/m3 (0) | 38.0 | |
| May 20, 2019, 10 p.m. | 2.8 ppb (3) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 52.0 ppb (40) | 0.12 ppb (1) | N/A | -0.6 μg/m3 (0) | 40.0 | |
| May 20, 2019, 9 p.m. | 2.4 ppb (2) | 0.9 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 52.0 ppb (40) | 0.12 ppb (1) | N/A | -0.6 μg/m3 (0) | 40.0 | |
| May 20, 2019, 8 p.m. | 2.0 ppb (2) | 0.6 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 53.0 ppb (41) | 0.12 ppb (1) | N/A | 0.4 μg/m3 (2) | 41.0 | |
| May 20, 2019, 7 p.m. | 2.1 ppb (2) | 0.8 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 53.0 ppb (41) | 0.13 ppb (1) | N/A | 3.0 μg/m3 (12) | 41.0 | |
| May 20, 2019, 6 p.m. | 1.6 ppb (1) | 0.7 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 52.0 ppb (40) | 0.12 ppb (1) | N/A | 0.2 μg/m3 (1) | 40.0 | |
| May 20, 2019, 5 p.m. | 1.8 ppb (2) | 0.9 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 53.0 ppb (41) | 0.13 ppb (1) | N/A | -3.3 μg/m3 (0) | 41.0 | |
| May 20, 2019, 4 p.m. | 2.3 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 51.0 ppb (39) | 0.13 ppb (1) | N/A | -1.6 μg/m3 (0) | 39.0 | |
| May 20, 2019, 3 p.m. | 5.6 ppb (5) | 1.9 ppb (2) | N/A | 4.0 ppb (4) | N/A | N/A | 42.0 ppb (32) | 0.16 ppb (2) | N/A | -0.3 μg/m3 (0) | 32.0 | |
| May 20, 2019, 2 p.m. | 22.4 ppb (21) | 11.3 ppb (10) | N/A | 11.0 ppb (10) | N/A | N/A | 17.0 ppb (13) | 0.34 ppb (4) | N/A | 0.0 μg/m3 (0) | 21.0 | |
| May 20, 2019, 1 p.m. | 32.2 ppb (30) | 19.0 ppb (18) | N/A | 13.0 ppb (12) | N/A | N/A | 4.0 ppb (3) | 0.43 ppb (5) | N/A | 2.8 μg/m3 (12) | 30.0 | |
| May 20, 2019, noon | 13.5 ppb (12) | 4.0 ppb (4) | N/A | 9.0 ppb (8) | N/A | N/A | 5.0 ppb (4) | 0.23 ppb (3) | N/A | 5.5 μg/m3 (23) | 23.0 | |
| May 20, 2019, 11 a.m. | 4.1 ppb (4) | 0.9 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 13.0 ppb (10) | 0.16 ppb (2) | N/A | 5.7 μg/m3 (24) | 24.0 | |
| May 20, 2019, 10 a.m. | 5.9 ppb (5) | 1.1 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 17.0 ppb (13) | 0.18 ppb (2) | N/A | 2.3 μg/m3 (10) | 13.0 | |
| May 20, 2019, 9 a.m. | 4.2 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 22.0 ppb (17) | 0.16 ppb (2) | N/A | -1.1 μg/m3 (0) | 17.0 | |
| May 20, 2019, 8 a.m. | 5.9 ppb (5) | 1.1 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 21.0 ppb (16) | 0.18 ppb (2) | N/A | 0.9 μg/m3 (4) | 16.0 | |
| May 20, 2019, 7 a.m. | 4.2 ppb (4) | 0.7 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 29.0 ppb (22) | 0.16 ppb (2) | N/A | -0.1 μg/m3 (0) | 22.0 | |
| May 20, 2019, 6 a.m. | 3.7 ppb (3) | 0.7 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 31.0 ppb (24) | 0.16 ppb (2) | N/A | -1.3 μg/m3 (0) | 24.0 | |
| May 20, 2019, 5 a.m. | 2.9 ppb (3) | 0.8 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 39.0 ppb (30) | 0.12 ppb (1) | N/A | -0.3 μg/m3 (0) | 30.0 | |
| May 20, 2019, 4 a.m. | 2.8 ppb (3) | 0.9 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 42.0 ppb (32) | 0.12 ppb (1) | N/A | 0.4 μg/m3 (2) | 32.0 | |
| May 20, 2019, 3 a.m. | 1.8 ppb (2) | 0.8 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 46.0 ppb (35) | 0.11 ppb (1) | N/A | 0.9 μg/m3 (4) | 35.0 | |
| May 20, 2019, 2 a.m. | 2.1 ppb (2) | 1.1 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 46.0 ppb (35) | 0.12 ppb (1) | N/A | 3.3 μg/m3 (14) | 35.0 | |
| May 20, 2019, 1 a.m. | 2.3 ppb (2) | 1.5 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 46.0 ppb (35) | 0.09 ppb (1) | N/A | 4.3 μg/m3 (18) | 35.0 | |
| May 20, 2019, midnight | 1.6 ppb (1) | 0.7 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 47.0 ppb (36) | 0.09 ppb (1) | N/A | 5.0 μg/m3 (21) | 36.0 | |
| May 19, 2019, 11 p.m. | 1.7 ppb (2) | 0.7 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 49.0 ppb (38) | 0.09 ppb (1) | N/A | 4.3 μg/m3 (18) | 38.0 | |
| May 19, 2019, 10 p.m. | 1.9 ppb (2) | 0.8 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 51.0 ppb (39) | 0.09 ppb (1) | N/A | 1.8 μg/m3 (8) | 39.0 | |
| May 19, 2019, 9 p.m. | 3.7 ppb (3) | 1.5 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 48.0 ppb (37) | 0.11 ppb (1) | N/A | 2.1 μg/m3 (9) | 37.0 | |
| May 19, 2019, 8 p.m. | 4.9 ppb (5) | 1.8 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | 45.0 ppb (35) | 0.13 ppb (1) | N/A | 7.5 μg/m3 (31) | 35.0 | |
| May 19, 2019, 7 p.m. | 5.3 ppb (5) | 1.9 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | 42.0 ppb (32) | 0.13 ppb (1) | N/A | 1.7 μg/m3 (7) | 32.0 | |
| May 19, 2019, 6 p.m. | 4.3 ppb (4) | 1.8 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | 43.0 ppb (33) | 0.14 ppb (2) | N/A | -4.5 μg/m3 (0) | 33.0 | |
| May 19, 2019, 5 p.m. | 4.7 ppb (4) | 1.9 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | 44.0 ppb (34) | 0.13 ppb (1) | N/A | 1.4 μg/m3 (6) | 34.0 | |
| May 19, 2019, 4 p.m. | 5.0 ppb (5) | 1.4 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | 43.0 ppb (33) | 0.15 ppb (2) | N/A | 2.2 μg/m3 (9) | 33.0 | |
| May 19, 2019, 3 p.m. | 3.9 ppb (4) | 0.8 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 42.0 ppb (32) | 0.15 ppb (2) | N/A | 1.9 μg/m3 (8) | 32.0 | |
| May 19, 2019, 2 p.m. | 3.5 ppb (3) | 0.8 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 43.0 ppb (33) | 0.14 ppb (2) | N/A | 3.5 μg/m3 (15) | 33.0 | |
| May 19, 2019, 1 p.m. | 3.2 ppb (3) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 41.0 ppb (32) | 0.14 ppb (2) | N/A | 5.3 μg/m3 (22) | 32.0 | |
| May 19, 2019, noon | 1.6 ppb (1) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 43.0 ppb (33) | 0.14 ppb (2) | N/A | 4.5 μg/m3 (19) | 33.0 | |
| May 19, 2019, 11 a.m. | 1.5 ppb (1) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 46.0 ppb (35) | 0.13 ppb (1) | N/A | 3.8 μg/m3 (16) | 35.0 | |
| May 19, 2019, 10 a.m. | 1.6 ppb (1) | 0.5 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 50.0 ppb (38) | 0.14 ppb (2) | N/A | -1.0 μg/m3 (0) | 38.0 | |
| May 19, 2019, 9 a.m. | 1.3 ppb (1) | 0.2 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 44.0 ppb (34) | 0.11 ppb (1) | N/A | -2.5 μg/m3 (0) | 34.0 | |
| May 19, 2019, 8 a.m. | 0.9 ppb (1) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 46.0 ppb (35) | 0.12 ppb (1) | N/A | 1.2 μg/m3 (5) | 35.0 | |
| May 19, 2019, 7 a.m. | 1.7 ppb (2) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 47.0 ppb (36) | 0.1 ppb (1) | N/A | 5.0 μg/m3 (21) | 36.0 | |
| May 19, 2019, 6 a.m. | 2.6 ppb (2) | 0.4 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | 43.0 ppb (33) | 0.12 ppb (1) | N/A | 8.2 μg/m3 (34) | 34.0 | |
| May 19, 2019, 5 a.m. | 3.7 ppb (3) | 0.4 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | 45.0 ppb (35) | 0.13 ppb (1) | N/A | 8.5 μg/m3 (35) | 35.0 | |
| May 19, 2019, 4 a.m. | 4.3 ppb (4) | 0.3 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | 46.0 ppb (35) | 0.15 ppb (2) | N/A | 4.5 μg/m3 (19) | 35.0 | |
| May 19, 2019, 3 a.m. | 4.1 ppb (4) | 0.3 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | 47.0 ppb (36) | 0.14 ppb (2) | N/A | 1.8 μg/m3 (8) | 36.0 | |
| May 19, 2019, 2 a.m. | 3.3 ppb (3) | 0.4 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | 50.0 ppb (38) | 0.13 ppb (1) | N/A | 4.3 μg/m3 (18) | 38.0 | |
| May 19, 2019, 1 a.m. | 5.8 ppb (5) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 49.0 ppb (38) | 0.12 ppb (1) | N/A | 6.0 μg/m3 (25) | 38.0 | |
| May 19, 2019, midnight | 3.7 ppb (3) | 0.5 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | 52.0 ppb (40) | 0.12 ppb (1) | N/A | 8.5 μg/m3 (35) | 40.0 | |
| May 18, 2019, 11 p.m. | 3.4 ppb (3) | 0.6 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 54.0 ppb (42) | 0.12 ppb (1) | N/A | 9.4 μg/m3 (39) | 42.0 | |
| May 18, 2019, 10 p.m. | 4.0 ppb (4) | 0.8 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 57.0 ppb (44) | 0.14 ppb (2) | N/A | 5.0 μg/m3 (21) | 44.0 | |
| May 18, 2019, 9 p.m. | 4.2 ppb (4) | 0.7 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 62.0 ppb (48) | 0.16 ppb (2) | N/A | 3.8 μg/m3 (16) | 48.0 | |
| May 18, 2019, 8 p.m. | 4.0 ppb (4) | 0.8 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 61.0 ppb (47) | 0.16 ppb (2) | N/A | 3.3 μg/m3 (14) | 47.0 | |
| May 18, 2019, 7 p.m. | 5.4 ppb (5) | 1.2 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | 56.0 ppb (43) | 0.16 ppb (2) | N/A | 2.1 μg/m3 (9) | 43.0 | |
| May 18, 2019, 6 p.m. | 6.1 ppb (6) | 1.2 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 52.0 ppb (40) | 0.18 ppb (2) | N/A | 6.5 μg/m3 (27) | 40.0 | |
| May 18, 2019, 5 p.m. | 8.4 ppb (8) | 2.2 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | 47.0 ppb (36) | 0.2 ppb (2) | N/A | 9.2 μg/m3 (38) | 38.0 | |
| May 18, 2019, 4 p.m. | 10.4 ppb (10) | 3.2 ppb (3) | N/A | 7.0 ppb (6) | N/A | N/A | 36.0 ppb (28) | 0.22 ppb (2) | N/A | 4.3 μg/m3 (18) | 28.0 | |
| May 18, 2019, 3 p.m. | 13.2 ppb (12) | 4.9 ppb (5) | N/A | 8.0 ppb (7) | N/A | N/A | 26.0 ppb (20) | 0.24 ppb (3) | N/A | 3.5 μg/m3 (15) | 20.0 | |
| May 18, 2019, 2 p.m. | 20.5 ppb (19) | 8.5 ppb (8) | N/A | 12.0 ppb (11) | N/A | N/A | 16.0 ppb (12) | 0.31 ppb (3) | N/A | 2.1 μg/m3 (9) | 19.0 | |
| May 18, 2019, 1 p.m. | 15.7 ppb (15) | 5.5 ppb (5) | N/A | 10.0 ppb (9) | N/A | N/A | 8.0 ppb (6) | 0.26 ppb (3) | N/A | 1.4 μg/m3 (6) | 15.0 | |
| May 18, 2019, noon | 9.4 ppb (9) | 1.5 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | 12.0 ppb (9) | 0.2 ppb (2) | N/A | 4.1 μg/m3 (17) | 17.0 | |
| May 18, 2019, 11 a.m. | 7.5 ppb (7) | 0.8 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 17.0 ppb (13) | 0.19 ppb (2) | N/A | 2.8 μg/m3 (12) | 13.0 | |
| May 18, 2019, 10 a.m. | 7.3 ppb (7) | 0.7 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 21.0 ppb (16) | 0.2 ppb (2) | N/A | 3.8 μg/m3 (16) | 16.0 | |
| May 18, 2019, 9 a.m. | 5.1 ppb (5) | 0.5 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | 27.0 ppb (21) | 0.16 ppb (2) | N/A | 5.8 μg/m3 (24) | 24.0 | |
| May 18, 2019, 8 a.m. | 5.3 ppb (5) | 0.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 34.0 ppb (26) | 0.16 ppb (2) | N/A | 2.8 μg/m3 (12) | 26.0 | |
| May 18, 2019, 7 a.m. | 3.2 ppb (3) | 0.3 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | 45.0 ppb (35) | 0.13 ppb (1) | N/A | 3.3 μg/m3 (14) | 35.0 | |
| May 18, 2019, 6 a.m. | 2.1 ppb (2) | 0.3 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | 49.0 ppb (38) | 0.13 ppb (1) | N/A | 8.9 μg/m3 (37) | 38.0 | |
| May 18, 2019, 5 a.m. | 2.1 ppb (2) | 0.1 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | 48.0 ppb (37) | 0.12 ppb (1) | N/A | 8.7 μg/m3 (36) | 37.0 | |
| May 18, 2019, 4 a.m. | 2.5 ppb (2) | 0.3 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | 47.0 ppb (36) | 0.1 ppb (1) | N/A | 2.1 μg/m3 (9) | 36.0 | |
| May 18, 2019, 3 a.m. | 2.2 ppb (2) | 0.2 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | 46.0 ppb (35) | 0.11 ppb (1) | N/A | 0.9 μg/m3 (4) | 35.0 | |
| May 18, 2019, 2 a.m. | 2.4 ppb (2) | 0.3 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | 48.0 ppb (37) | 0.11 ppb (1) | N/A | 4.3 μg/m3 (18) | 37.0 | |
| May 18, 2019, 1 a.m. | 3.0 ppb (3) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 50.0 ppb (38) | 0.13 ppb (1) | N/A | 6.2 μg/m3 (26) | 38.0 | |
| May 18, 2019, midnight | 3.4 ppb (3) | 0.9 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 52.0 ppb (40) | 0.17 ppb (2) | N/A | 6.5 μg/m3 (27) | 40.0 | |
| May 17, 2019, 11 p.m. | 3.6 ppb (3) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 53.0 ppb (41) | 0.21 ppb (2) | N/A | 2.8 μg/m3 (12) | 41.0 | |
| May 17, 2019, 10 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 | |
| May 17, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 1.1 μg/m3 (5) | 5.0 | |
| May 17, 2019, 8 p.m. | 2.0 ppb (2) | 0.6 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 49.0 ppb (38) | 0.19 ppb (2) | N/A | -1.3 μg/m3 (0) | 38.0 | |
| May 17, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | -3.0 μg/m3 (0) | N/A | |
| May 17, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | -3.0 μg/m3 (0) | N/A | |
| May 17, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.5 μg/m3 (2) | 2.0 | |
| May 17, 2019, 4 p.m. | 1.1 ppb (1) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 45.0 ppb (35) | 0.13 ppb (1) | N/A | -0.8 μg/m3 (0) | 35.0 | |
| May 17, 2019, 3 p.m. | 2.4 ppb (2) | 1.2 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 43.0 ppb (33) | 0.14 ppb (2) | N/A | -2.8 μg/m3 (0) | 33.0 | |
| May 17, 2019, 2 p.m. | 15.7 ppb (15) | 6.8 ppb (6) | N/A | 9.0 ppb (8) | N/A | N/A | 28.0 ppb (22) | 0.19 ppb (2) | N/A | 0.5 μg/m3 (2) | 22.0 | |
| May 17, 2019, 1 p.m. | 17.7 ppb (16) | 6.2 ppb (6) | N/A | 12.0 ppb (11) | N/A | N/A | 8.0 ppb (6) | 0.27 ppb (3) | N/A | 0.9 μg/m3 (4) | 16.0 | |
| May 17, 2019, noon | 16.6 ppb (15) | 4.0 ppb (4) | N/A | 13.0 ppb (12) | N/A | N/A | 5.0 ppb (4) | 0.29 ppb (3) | N/A | -4.5 μg/m3 (0) | 15.0 | |
| May 17, 2019, 11 a.m. | 11.6 ppb (11) | 1.6 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | 8.0 ppb (6) | 0.18 ppb (2) | N/A | -1.8 μg/m3 (0) | 11.0 | |
| May 17, 2019, 10 a.m. | 6.9 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | 16.0 ppb (12) | 0.17 ppb (2) | N/A | 1.7 μg/m3 (7) | 12.0 | |
| May 17, 2019, 9 a.m. | 1.2 ppb (1) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 36.0 ppb (28) | 0.13 ppb (1) | N/A | 1.4 μg/m3 (6) | 28.0 | |
| May 17, 2019, 8 a.m. | 2.3 ppb (2) | 0.2 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | 29.0 ppb (22) | 0.14 ppb (2) | N/A | 4.5 μg/m3 (19) | 22.0 | |
| May 17, 2019, 7 a.m. | 8.9 ppb (8) | 1.5 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 6.0 ppb (5) | 0.24 ppb (3) | N/A | 1.7 μg/m3 (7) | 8.0 | |
| May 17, 2019, 6 a.m. | 10.5 ppb (10) | 1.5 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | 4.0 ppb (3) | 0.22 ppb (2) | N/A | -0.1 μg/m3 (0) | 10.0 | |
| May 17, 2019, 5 a.m. | 7.5 ppb (7) | 0.8 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 10.0 ppb (8) | 0.16 ppb (2) | N/A | 4.3 μg/m3 (18) | 18.0 | |
| May 17, 2019, 4 a.m. | 7.4 ppb (7) | 0.7 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 16.0 ppb (12) | 0.13 ppb (1) | N/A | 8.2 μg/m3 (34) | 34.0 | |
| May 17, 2019, 3 a.m. | 6.8 ppb (6) | 0.5 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | 26.0 ppb (20) | 0.12 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 17, 2019, 2 a.m. | 4.6 ppb (4) | 0.4 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | 36.0 ppb (28) | 0.1 ppb (1) | N/A | 4.0 μg/m3 (17) | 28.0 | |
| May 17, 2019, 1 a.m. | 3.8 ppb (4) | 0.6 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 38.0 ppb (29) | 0.1 ppb (1) | N/A | 5.7 μg/m3 (24) | 29.0 | |
| May 17, 2019, midnight | 2.4 ppb (2) | 0.6 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 45.0 ppb (35) | 0.09 ppb (1) | N/A | 1.8 μg/m3 (8) | 35.0 | |
| May 16, 2019, 11 p.m. | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 45.0 ppb (35) | 0.1 ppb (1) | N/A | -2.0 μg/m3 (0) | 35.0 | |
| May 16, 2019, 10 p.m. | 3.3 ppb (3) | 1.1 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 47.0 ppb (36) | 0.1 ppb (1) | N/A | -0.3 μg/m3 (0) | 36.0 | |
| May 16, 2019, 9 p.m. | 3.1 ppb (3) | 1.1 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 47.0 ppb (36) | 0.1 ppb (1) | N/A | 2.6 μg/m3 (11) | 36.0 | |
| May 16, 2019, 8 p.m. | 2.4 ppb (2) | 0.8 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 48.0 ppb (37) | 0.09 ppb (1) | N/A | -2.5 μg/m3 (0) | 37.0 | |
| May 16, 2019, 7 p.m. | 3.4 ppb (3) | 1.5 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 42.0 ppb (32) | 0.09 ppb (1) | N/A | -0.3 μg/m3 (0) | 32.0 | |
| May 16, 2019, 6 p.m. | 5.5 ppb (5) | 2.1 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | 34.0 ppb (26) | 0.1 ppb (1) | N/A | 1.9 μg/m3 (8) | 26.0 | |
| May 16, 2019, 5 p.m. | 9.6 ppb (9) | 3.1 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | 23.0 ppb (18) | 0.14 ppb (2) | N/A | -1.3 μg/m3 (0) | 18.0 | |
| May 16, 2019, 4 p.m. | 9.7 ppb (9) | 3.6 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | 22.0 ppb (17) | 0.16 ppb (2) | N/A | -0.5 μg/m3 (0) | 17.0 | |
| May 16, 2019, 3 p.m. | 9.4 ppb (9) | 2.9 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | 22.0 ppb (17) | 0.15 ppb (2) | N/A | -1.3 μg/m3 (0) | 17.0 | |
| May 16, 2019, 2 p.m. | 7.8 ppb (7) | 2.3 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | 24.0 ppb (18) | 0.13 ppb (1) | N/A | 1.0 μg/m3 (4) | 18.0 | |
| May 16, 2019, 1 p.m. | 5.5 ppb (5) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 25.0 ppb (19) | 0.13 ppb (1) | N/A | 2.6 μg/m3 (11) | 19.0 | |
| May 16, 2019, noon | 4.9 ppb (5) | 0.4 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | 24.0 ppb (18) | 0.14 ppb (2) | N/A | 1.6 μg/m3 (7) | 18.0 | |
| May 16, 2019, 11 a.m. | 5.7 ppb (5) | 0.3 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | 21.0 ppb (16) | 0.12 ppb (1) | N/A | 3.8 μg/m3 (16) | 16.0 | |
| May 16, 2019, 10 a.m. | 5.3 ppb (5) | 0.5 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | 22.0 ppb (17) | 0.12 ppb (1) | N/A | 4.3 μg/m3 (18) | 18.0 | |
| May 16, 2019, 9 a.m. | 3.4 ppb (3) | 0.2 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | 24.0 ppb (18) | 0.1 ppb (1) | N/A | 2.6 μg/m3 (11) | 18.0 | |
| May 16, 2019, 8 a.m. | 2.2 ppb (2) | 0.2 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | 26.0 ppb (20) | 0.1 ppb (1) | N/A | 2.6 μg/m3 (11) | 20.0 | |
| May 16, 2019, 7 a.m. | 2.5 ppb (2) | 0.3 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | 26.0 ppb (20) | 0.09 ppb (1) | N/A | 1.8 μg/m3 (8) | 20.0 | |
| May 16, 2019, 6 a.m. | 6.2 ppb (6) | 0.9 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 24.0 ppb (18) | 0.1 ppb (1) | N/A | 3.1 μg/m3 (13) | 18.0 | |
| May 16, 2019, 5 a.m. | 4.0 ppb (4) | 0.2 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | 27.0 ppb (21) | 0.1 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 16, 2019, 4 a.m. | 4.4 ppb (4) | 0.2 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | 28.0 ppb (22) | 0.09 ppb (1) | N/A | 6.7 μg/m3 (28) | 28.0 | |
| May 16, 2019, 3 a.m. | 6.6 ppb (6) | 0.2 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | 30.0 ppb (23) | 0.1 ppb (1) | N/A | 7.5 μg/m3 (31) | 31.0 | |
| May 16, 2019, 2 a.m. | 7.3 ppb (7) | 0.7 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 36.0 ppb (28) | 0.11 ppb (1) | N/A | 9.7 μg/m3 (40) | 40.0 | |
| May 16, 2019, 1 a.m. | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | 40.0 ppb (31) | 0.13 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 16, 2019, midnight | 8.6 ppb (8) | 1.4 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 43.0 ppb (33) | 0.13 ppb (1) | N/A | 6.7 μg/m3 (28) | 33.0 | |
| May 15, 2019, 11 p.m. | 9.4 ppb (9) | 1.7 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | 49.0 ppb (38) | 0.15 ppb (2) | N/A | 15.6 μg/m3 (58) | 58.0 | |
| May 15, 2019, 10 p.m. | 9.9 ppb (9) | 1.7 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | 54.0 ppb (42) | 0.17 ppb (2) | N/A | 16.7 μg/m3 (60) | 60.0 | |
| May 15, 2019, 9 p.m. | 9.6 ppb (9) | 1.8 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | 59.0 ppb (45) | 0.2 ppb (2) | N/A | 16.3 μg/m3 (59) | 59.0 | |
| May 15, 2019, 8 p.m. | 10.8 ppb (10) | 2.1 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | 54.0 ppb (42) | 0.21 ppb (2) | N/A | 12.4 μg/m3 (51) | 51.0 | |
| May 15, 2019, 7 p.m. | 12.9 ppb (12) | 3.2 ppb (3) | N/A | 10.0 ppb (9) | N/A | N/A | 48.0 ppb (37) | 0.23 ppb (3) | N/A | 21.7 μg/m3 (71) | 71.0 | |
| May 15, 2019, 6 p.m. | 12.3 ppb (11) | 3.1 ppb (3) | N/A | 9.0 ppb (8) | N/A | N/A | 43.0 ppb (33) | 0.22 ppb (2) | N/A | 17.5 μg/m3 (62) | 62.0 | |
| May 15, 2019, 5 p.m. | 14.2 ppb (13) | 4.0 ppb (4) | N/A | 10.0 ppb (9) | N/A | N/A | 38.0 ppb (29) | 0.24 ppb (3) | N/A | 19.0 μg/m3 (65) | 65.0 | |
| May 15, 2019, 4 p.m. | 12.1 ppb (11) | 2.3 ppb (2) | N/A | 10.0 ppb (9) | N/A | N/A | 37.0 ppb (28) | 0.24 ppb (3) | N/A | 14.1 μg/m3 (54) | 54.0 | |
| May 15, 2019, 3 p.m. | 19.1 ppb (18) | 6.7 ppb (6) | N/A | 12.0 ppb (11) | N/A | N/A | 31.0 ppb (24) | 0.24 ppb (3) | N/A | 22.7 μg/m3 (73) | 73.0 | |
| May 15, 2019, 2 p.m. | 14.7 ppb (14) | 2.6 ppb (2) | N/A | 12.0 ppb (11) | N/A | N/A | 27.0 ppb (21) | 0.25 ppb (3) | N/A | 18.2 μg/m3 (63) | 63.0 | |
| May 15, 2019, 1 p.m. | 9.5 ppb (9) | 1.1 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | 30.0 ppb (23) | 0.2 ppb (2) | N/A | 7.5 μg/m3 (31) | 31.0 | |
| May 15, 2019, noon | 7.4 ppb (7) | 0.8 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 33.0 ppb (25) | 0.2 ppb (2) | N/A | 14.8 μg/m3 (56) | 56.0 | |
| May 15, 2019, 11 a.m. | 5.9 ppb (5) | 0.5 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | 35.0 ppb (27) | 0.19 ppb (2) | N/A | 18.0 μg/m3 (63) | 63.0 | |
| May 15, 2019, 10 a.m. | 6.3 ppb (6) | 0.6 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | 38.0 ppb (29) | 0.19 ppb (2) | N/A | 17.8 μg/m3 (62) | 62.0 | |
| May 15, 2019, 9 a.m. | 7.1 ppb (7) | 0.5 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | 41.0 ppb (32) | 0.18 ppb (2) | N/A | 17.3 μg/m3 (61) | 61.0 | |
| May 15, 2019, 8 a.m. | 9.3 ppb (9) | 0.6 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | 40.0 ppb (31) | 0.22 ppb (2) | N/A | 16.8 μg/m3 (60) | 60.0 | |
| May 15, 2019, 7 a.m. | 16.3 ppb (15) | 0.8 ppb (1) | N/A | 16.0 ppb (15) | N/A | N/A | 29.0 ppb (22) | 0.28 ppb (3) | N/A | 14.6 μg/m3 (56) | 56.0 | |
| May 15, 2019, 6 a.m. | 16.1 ppb (15) | 1.0 ppb (1) | N/A | 15.0 ppb (14) | N/A | N/A | 29.0 ppb (22) | 0.31 ppb (3) | N/A | 17.3 μg/m3 (61) | 61.0 | |
| May 15, 2019, 5 a.m. | 9.2 ppb (9) | 0.6 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | 35.0 ppb (27) | 0.14 ppb (2) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 15, 2019, 4 a.m. | 18.8 ppb (17) | 0.8 ppb (1) | N/A | 18.0 ppb (17) | N/A | N/A | 41.0 ppb (32) | 0.25 ppb (3) | N/A | 21.5 μg/m3 (70) | 70.0 | |
| May 15, 2019, 3 a.m. | 13.2 ppb (12) | 0.5 ppb (0) | N/A | 13.0 ppb (12) | N/A | N/A | 52.0 ppb (40) | 0.23 ppb (3) | N/A | 12.6 μg/m3 (51) | 51.0 | |
| May 15, 2019, 2 a.m. | 14.1 ppb (13) | 0.8 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | 58.0 ppb (45) | 0.22 ppb (2) | N/A | 14.1 μg/m3 (54) | 54.0 | |
| May 15, 2019, 1 a.m. | 10.2 ppb (9) | 0.5 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 68.0 ppb (52) | 0.21 ppb (2) | N/A | 19.0 μg/m3 (65) | 65.0 | |
| May 15, 2019, midnight | 9.7 ppb (9) | 1.1 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | 76.0 ppb (59) | 0.2 ppb (2) | N/A | 20.2 μg/m3 (67) | 67.0 | |
| May 14, 2019, 11 p.m. | 7.4 ppb (7) | 0.8 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 78.0 ppb (61) | 0.19 ppb (2) | N/A | 11.4 μg/m3 (48) | 61.0 | |
| May 14, 2019, 10 p.m. | 7.7 ppb (7) | 0.8 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 79.0 ppb (62) | 0.2 ppb (2) | N/A | 12.6 μg/m3 (51) | 62.0 | |
| May 14, 2019, 9 p.m. | 9.1 ppb (8) | 1.0 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | 75.0 ppb (58) | 0.24 ppb (3) | N/A | 17.0 μg/m3 (61) | 61.0 | |
| May 14, 2019, 8 p.m. | 10.8 ppb (10) | 1.7 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | 66.0 ppb (51) | 0.25 ppb (3) | N/A | 18.0 μg/m3 (63) | 63.0 | |
| May 14, 2019, 7 p.m. | 12.9 ppb (12) | 2.8 ppb (3) | N/A | 10.0 ppb (9) | N/A | N/A | 56.0 ppb (43) | 0.25 ppb (3) | N/A | 23.9 μg/m3 (75) | 75.0 | |
| May 14, 2019, 6 p.m. | 12.9 ppb (12) | 3.1 ppb (3) | N/A | 10.0 ppb (9) | N/A | N/A | 46.0 ppb (35) | 0.24 ppb (3) | N/A | 17.3 μg/m3 (61) | 61.0 | |
| May 14, 2019, 5 p.m. | 13.7 ppb (13) | 4.0 ppb (4) | N/A | 10.0 ppb (9) | N/A | N/A | 36.0 ppb (28) | 0.23 ppb (3) | N/A | 20.0 μg/m3 (67) | 67.0 | |
| May 14, 2019, 4 p.m. | 14.3 ppb (13) | 4.6 ppb (4) | N/A | 10.0 ppb (9) | N/A | N/A | 30.0 ppb (23) | 0.23 ppb (3) | N/A | 21.4 μg/m3 (70) | 70.0 | |
| May 14, 2019, 3 p.m. | 11.4 ppb (11) | 2.3 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | 26.0 ppb (20) | 0.22 ppb (2) | N/A | 17.0 μg/m3 (61) | 61.0 | |
| May 14, 2019, 2 p.m. | 9.1 ppb (8) | 1.2 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | 25.0 ppb (19) | 0.21 ppb (2) | N/A | 16.5 μg/m3 (60) | 60.0 | |
| May 14, 2019, 1 p.m. | 6.7 ppb (6) | 0.5 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | 27.0 ppb (21) | 0.19 ppb (2) | N/A | 18.0 μg/m3 (63) | 63.0 | |
| May 14, 2019, noon | 6.1 ppb (6) | 0.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 30.0 ppb (23) | 0.2 ppb (2) | N/A | 22.7 μg/m3 (73) | 73.0 | |
| May 14, 2019, 11 a.m. | 7.4 ppb (7) | 0.6 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 29.0 ppb (22) | 0.2 ppb (2) | N/A | 21.0 μg/m3 (69) | 69.0 | |
| May 14, 2019, 10 a.m. | 6.1 ppb (6) | 0.8 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 30.0 ppb (23) | 0.19 ppb (2) | N/A | 22.2 μg/m3 (72) | 72.0 | |
| May 14, 2019, 9 a.m. | 4.8 ppb (4) | 0.4 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | 31.0 ppb (24) | 0.15 ppb (2) | N/A | 12.4 μg/m3 (51) | 51.0 | |
| May 14, 2019, 8 a.m. | 3.9 ppb (4) | 0.4 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | 33.0 ppb (25) | 0.14 ppb (2) | N/A | 10.7 μg/m3 (45) | 45.0 | |
| May 14, 2019, 7 a.m. | 5.6 ppb (5) | 0.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 29.0 ppb (22) | 0.11 ppb (1) | N/A | 8.5 μg/m3 (35) | 35.0 | |
| May 14, 2019, 6 a.m. | 7.3 ppb (7) | 0.6 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 27.0 ppb (21) | 0.11 ppb (1) | N/A | 9.2 μg/m3 (38) | 38.0 | |
| May 14, 2019, 5 a.m. | 9.1 ppb (8) | 0.4 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | 33.0 ppb (25) | 0.13 ppb (1) | N/A | 10.7 μg/m3 (45) | 45.0 | |
| May 14, 2019, 4 a.m. | 15.5 ppb (14) | 2.1 ppb (2) | N/A | 13.0 ppb (12) | N/A | N/A | 38.0 ppb (29) | 0.16 ppb (2) | N/A | 17.7 μg/m3 (62) | 62.0 | |
| May 14, 2019, 3 a.m. | 11.0 ppb (10) | 0.7 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | 43.0 ppb (33) | 0.17 ppb (2) | N/A | 14.4 μg/m3 (55) | 55.0 | |
| May 14, 2019, 2 a.m. | 9.8 ppb (9) | 0.8 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | 48.0 ppb (37) | 0.17 ppb (2) | N/A | 16.7 μg/m3 (60) | 60.0 |