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| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sept. 16, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | N/A | |
| Sept. 15, 2019, 11 p.m. | 1.4 ppb (1) | 0.5 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -0.7 μg/m3 (0) | 1.0 | |
| Sept. 15, 2019, 10 p.m. | 1.6 ppb (1) | 0.6 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -0.7 μg/m3 (0) | 1.0 | |
| Sept. 15, 2019, 9 p.m. | 2.3 ppb (2) | 0.9 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -0.7 μg/m3 (0) | 2.0 | |
| Sept. 15, 2019, 8 p.m. | 4.1 ppb (4) | 1.6 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 0.2 μg/m3 (1) | 4.0 | |
| Sept. 15, 2019, 7 p.m. | 2.1 ppb (2) | 0.9 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.5 μg/m3 (2) | 2.0 | |
| Sept. 15, 2019, 6 p.m. | 2.1 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -0.4 μg/m3 (0) | 2.0 | |
| Sept. 15, 2019, 5 p.m. | 2.4 ppb (2) | 0.9 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.2 μg/m3 (9) | 9.0 | |
| Sept. 15, 2019, 4 p.m. | 2.5 ppb (2) | 0.9 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 3.7 μg/m3 (15) | 15.0 | |
| Sept. 15, 2019, 3 p.m. | 6.5 ppb (6) | 2.6 ppb (2) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 1.9 μg/m3 (8) | 8.0 | |
| Sept. 15, 2019, 2 p.m. | 10.0 ppb (9) | 4.3 ppb (4) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 3.4 μg/m3 (14) | 14.0 | |
| Sept. 15, 2019, 1 p.m. | 4.5 ppb (4) | 2.0 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 3.6 μg/m3 (15) | 15.0 | |
| Sept. 15, 2019, noon | 1.6 ppb (1) | 0.5 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.9 μg/m3 (12) | 12.0 | |
| Sept. 15, 2019, 11 a.m. | 0.5 ppb (0) | 0.2 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 0.4 μg/m3 (2) | 2.0 | |
| Sept. 15, 2019, 10 a.m. | 0.4 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 3.1 μg/m3 (13) | 13.0 | |
| Sept. 15, 2019, 9 a.m. | 0.6 ppb (1) | 0.2 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 6.7 μg/m3 (28) | 28.0 | |
| Sept. 15, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 7.2 μg/m3 (30) | 30.0 | |
| Sept. 15, 2019, 7 a.m. | 2.2 ppb (2) | 0.3 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Sept. 15, 2019, 6 a.m. | 0.4 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 5.9 μg/m3 (25) | 25.0 | |
| Sept. 15, 2019, 5 a.m. | 0.6 ppb (1) | 0.1 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 5.7 μg/m3 (24) | 24.0 | |
| Sept. 15, 2019, 4 a.m. | 2.0 ppb (2) | 0.4 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 5.4 μg/m3 (23) | 23.0 | |
| Sept. 15, 2019, 3 a.m. | 2.2 ppb (2) | 0.6 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 1.7 μg/m3 (7) | 7.0 | |
| Sept. 15, 2019, 2 a.m. | 1.6 ppb (1) | 0.5 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 4.2 μg/m3 (18) | 18.0 | |
| Sept. 15, 2019, 1 a.m. | 4.2 ppb (4) | 1.4 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 1.7 μg/m3 (7) | 7.0 | |
| Sept. 15, 2019, midnight | 2.4 ppb (2) | 0.8 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 1.2 μg/m3 (5) | 5.0 | |
| Sept. 14, 2019, 11 p.m. | 1.5 ppb (1) | 0.2 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.2 μg/m3 (5) | 5.0 | |
| Sept. 14, 2019, 10 p.m. | 1.8 ppb (2) | 0.8 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.7 μg/m3 (3) | 3.0 | |
| Sept. 14, 2019, 9 p.m. | 1.9 ppb (2) | 0.7 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 4.0 | |
| Sept. 14, 2019, 8 p.m. | 1.5 ppb (1) | 0.6 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 1.0 | |
| Sept. 14, 2019, 7 p.m. | 2.7 ppb (3) | 1.3 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -0.9 μg/m3 (0) | 3.0 | |
| Sept. 14, 2019, 6 p.m. | 1.7 ppb (2) | 0.7 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.2 μg/m3 (1) | 2.0 | |
| Sept. 14, 2019, 5 p.m. | 1.4 ppb (1) | 0.5 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 3.2 μg/m3 (13) | 13.0 | |
| Sept. 14, 2019, 4 p.m. | 1.4 ppb (1) | 0.5 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 4.2 μg/m3 (18) | 18.0 | |
| Sept. 14, 2019, 3 p.m. | 1.8 ppb (2) | 0.6 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 3.9 μg/m3 (16) | 16.0 | |
| Sept. 14, 2019, 2 p.m. | 3.0 ppb (3) | 1.3 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 2.7 μg/m3 (11) | 11.0 | |
| Sept. 14, 2019, 1 p.m. | 1.8 ppb (2) | 0.6 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.1 μg/m3 (9) | 9.0 | |
| Sept. 14, 2019, noon | 2.0 ppb (2) | 0.4 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 3.1 μg/m3 (13) | 13.0 | |
| Sept. 14, 2019, 11 a.m. | 0.6 ppb (1) | 0.0 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.7 μg/m3 (11) | 11.0 | |
| Sept. 14, 2019, 10 a.m. | 0.4 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 3.9 μg/m3 (16) | 16.0 | |
| Sept. 14, 2019, 9 a.m. | 1.0 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 3.2 μg/m3 (13) | 13.0 | |
| Sept. 14, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 1.6 μg/m3 (7) | 7.0 | |
| Sept. 14, 2019, 7 a.m. | 0.4 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 1.6 μg/m3 (7) | 7.0 | |
| Sept. 14, 2019, 6 a.m. | 0.6 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 3.4 μg/m3 (14) | 14.0 | |
| Sept. 14, 2019, 5 a.m. | 1.1 ppb (1) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 4.2 μg/m3 (18) | 18.0 | |
| Sept. 14, 2019, 4 a.m. | 1.9 ppb (2) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 4.2 μg/m3 (18) | 18.0 | |
| Sept. 14, 2019, 3 a.m. | 5.2 ppb (5) | 1.9 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 4.2 μg/m3 (18) | 18.0 | |
| Sept. 14, 2019, 2 a.m. | 2.0 ppb (2) | 0.3 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 4.2 μg/m3 (18) | 18.0 | |
| Sept. 14, 2019, 1 a.m. | 1.9 ppb (2) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Sept. 14, 2019, midnight | 2.0 ppb (2) | 0.4 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 3.5 μg/m3 (15) | 15.0 | |
| Sept. 13, 2019, 11 p.m. | 2.5 ppb (2) | 0.7 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 4.2 μg/m3 (18) | 18.0 | |
| Sept. 13, 2019, 10 p.m. | 2.9 ppb (3) | 1.1 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 8.0 | |
| Sept. 13, 2019, 9 p.m. | 2.9 ppb (3) | 1.2 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 0.5 μg/m3 (2) | 3.0 | |
| Sept. 13, 2019, 8 p.m. | 3.0 ppb (3) | 1.3 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 4.0 | |
| Sept. 13, 2019, 7 p.m. | 2.1 ppb (2) | 0.8 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 4.0 | |
| Sept. 13, 2019, 6 p.m. | 2.2 ppb (2) | 0.7 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.5 μg/m3 (2) | 2.0 | |
| Sept. 13, 2019, 5 p.m. | 2.1 ppb (2) | 0.7 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.9 μg/m3 (8) | 8.0 | |
| Sept. 13, 2019, 4 p.m. | 1.4 ppb (1) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.2 μg/m3 (9) | 9.0 | |
| Sept. 13, 2019, 3 p.m. | 5.3 ppb (5) | 2.4 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | -1.3 μg/m3 (0) | 5.0 | |
| Sept. 13, 2019, 2 p.m. | 9.9 ppb (9) | 5.9 ppb (5) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 9.0 | |
| Sept. 13, 2019, 1 p.m. | 5.6 ppb (5) | 2.3 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 0.9 μg/m3 (4) | 5.0 | |
| Sept. 13, 2019, noon | 1.1 ppb (1) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -0.3 μg/m3 (0) | 1.0 | |
| Sept. 13, 2019, 11 a.m. | 0.6 ppb (1) | 0.2 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 0.9 μg/m3 (4) | 4.0 | |
| Sept. 13, 2019, 10 a.m. | 0.1 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 2.9 μg/m3 (12) | 12.0 | |
| Sept. 13, 2019, 9 a.m. | 0.2 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 3.6 μg/m3 (15) | 15.0 | |
| Sept. 13, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 3.6 μg/m3 (15) | 15.0 | |
| Sept. 13, 2019, 7 a.m. | 0.1 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 1.4 μg/m3 (6) | 6.0 | |
| Sept. 13, 2019, 6 a.m. | 0.2 ppb (0) | 0.1 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 1.1 μg/m3 (5) | 5.0 | |
| Sept. 13, 2019, 5 a.m. | 0.6 ppb (1) | 0.2 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 1.6 μg/m3 (7) | 7.0 | |
| Sept. 13, 2019, 4 a.m. | 0.8 ppb (1) | 0.3 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 1.7 μg/m3 (7) | 7.0 | |
| Sept. 13, 2019, 3 a.m. | 2.0 ppb (2) | 0.5 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.5 μg/m3 (6) | 6.0 | |
| Sept. 13, 2019, 2 a.m. | 4.5 ppb (4) | 1.2 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 0.2 μg/m3 (1) | 4.0 | |
| Sept. 13, 2019, 1 a.m. | 10.2 ppb (9) | 5.9 ppb (5) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | -1.4 μg/m3 (0) | 9.0 | |
| Sept. 13, 2019, midnight | 1.4 ppb (1) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 1.0 | |
| Sept. 12, 2019, 11 p.m. | 2.3 ppb (2) | 0.9 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.7 μg/m3 (7) | 7.0 | |
| Sept. 12, 2019, 10 p.m. | 2.4 ppb (2) | 1.2 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 4.0 | |
| Sept. 12, 2019, 9 p.m. | 2.1 ppb (2) | 0.8 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 2.0 | |
| Sept. 12, 2019, 8 p.m. | 1.8 ppb (2) | 0.7 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -0.9 μg/m3 (0) | 2.0 | |
| Sept. 12, 2019, 7 p.m. | 1.4 ppb (1) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 1.0 | |
| Sept. 12, 2019, 6 p.m. | 0.9 ppb (1) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -0.2 μg/m3 (0) | 1.0 | |
| Sept. 12, 2019, 5 p.m. | 1.1 ppb (1) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -1.7 μg/m3 (0) | 1.0 | |
| Sept. 12, 2019, 4 p.m. | 0.9 ppb (1) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -1.7 μg/m3 (0) | 1.0 | |
| Sept. 12, 2019, 3 p.m. | 2.8 ppb (3) | 1.3 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -1.3 μg/m3 (0) | 3.0 | |
| Sept. 12, 2019, 2 p.m. | 3.4 ppb (3) | 2.0 ppb (2) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.1 μg/m3 (0) | 3.0 | |
| Sept. 12, 2019, 1 p.m. | 5.5 ppb (5) | 3.7 ppb (3) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 1.9 μg/m3 (8) | 8.0 | |
| Sept. 12, 2019, noon | 2.3 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.4 μg/m3 (10) | 10.0 | |
| Sept. 12, 2019, 11 a.m. | 0.4 ppb (0) | 0.2 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 0.1 μg/m3 (0) | N/A | |
| Sept. 12, 2019, 10 a.m. | 0.3 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | -0.8 μg/m3 (0) | N/A | |
| Sept. 12, 2019, 9 a.m. | 0.3 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 1.4 μg/m3 (6) | 6.0 | |
| Sept. 12, 2019, 8 a.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 | |
| Sept. 12, 2019, 7 a.m. | 0.5 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | -1.5 μg/m3 (0) | N/A | |
| Sept. 12, 2019, 6 a.m. | 0.8 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | 1.0 | |
| Sept. 12, 2019, 5 a.m. | 0.7 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.9 μg/m3 (4) | 4.0 | |
| Sept. 12, 2019, 4 a.m. | 1.3 ppb (1) | 0.5 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.9 μg/m3 (4) | 4.0 | |
| Sept. 12, 2019, 3 a.m. | 0.9 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.6 μg/m3 (7) | 7.0 | |
| Sept. 12, 2019, 2 a.m. | 1.2 ppb (1) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.4 μg/m3 (10) | 10.0 | |
| Sept. 12, 2019, 1 a.m. | 2.0 ppb (2) | 0.9 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.1 μg/m3 (5) | 5.0 | |
| Sept. 12, 2019, midnight | 6.4 ppb (6) | 3.2 ppb (3) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | -0.5 μg/m3 (0) | 6.0 | |
| Sept. 11, 2019, 11 p.m. | 4.3 ppb (4) | 2.2 ppb (2) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 0.1 μg/m3 (0) | 4.0 | |
| Sept. 11, 2019, 10 p.m. | 5.5 ppb (5) | 1.6 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 1.6 μg/m3 (7) | 7.0 | |
| Sept. 11, 2019, 9 p.m. | 4.9 ppb (5) | 2.0 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 1.9 μg/m3 (8) | 8.0 | |
| Sept. 11, 2019, 8 p.m. | 1.1 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.7 μg/m3 (7) | 7.0 | |
| Sept. 11, 2019, 7 p.m. | 0.9 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.7 μg/m3 (3) | 3.0 | |
| Sept. 11, 2019, 6 p.m. | 1.2 ppb (1) | 0.2 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.1 μg/m3 (9) | 9.0 | |
| Sept. 11, 2019, 5 p.m. | 1.3 ppb (1) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 4.1 μg/m3 (17) | 17.0 | |
| Sept. 11, 2019, 4 p.m. | 2.3 ppb (2) | 0.8 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.6 μg/m3 (7) | 7.0 | |
| Sept. 11, 2019, 3 p.m. | 1.4 ppb (1) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.9 μg/m3 (12) | 12.0 | |
| Sept. 11, 2019, 2 p.m. | 3.0 ppb (3) | 1.1 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 2.1 μg/m3 (9) | 9.0 | |
| Sept. 11, 2019, 1 p.m. | 3.8 ppb (4) | 2.4 ppb (2) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.4 μg/m3 (2) | 4.0 | |
| Sept. 11, 2019, noon | 0.7 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.9 μg/m3 (12) | 12.0 | |
| Sept. 11, 2019, 11 a.m. | 0.9 ppb (1) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 4.4 μg/m3 (18) | 18.0 | |
| Sept. 11, 2019, 10 a.m. | 0.4 ppb (0) | 0.1 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 3.1 μg/m3 (13) | 13.0 | |
| Sept. 11, 2019, 9 a.m. | 0.3 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 2.2 μg/m3 (9) | 9.0 | |
| Sept. 11, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | -0.5 μg/m3 (0) | N/A | |
| Sept. 11, 2019, 7 a.m. | 0.2 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 0.1 μg/m3 (0) | N/A | |
| Sept. 11, 2019, 6 a.m. | 3.5 ppb (3) | 3.1 ppb (3) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | -0.5 μg/m3 (0) | 3.0 | |
| Sept. 11, 2019, 5 a.m. | 1.4 ppb (1) | 0.6 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -0.3 μg/m3 (0) | 1.0 | |
| Sept. 11, 2019, 4 a.m. | 0.7 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.9 μg/m3 (4) | 4.0 | |
| Sept. 11, 2019, 3 a.m. | 1.0 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.9 μg/m3 (12) | 12.0 | |
| Sept. 11, 2019, 2 a.m. | 11.9 ppb (11) | 4.4 ppb (4) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Sept. 11, 2019, 1 a.m. | 3.9 ppb (4) | 1.2 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| Sept. 11, 2019, midnight | 2.7 ppb (3) | 1.2 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 3.7 μg/m3 (15) | 15.0 | |
| Sept. 10, 2019, 11 p.m. | 4.5 ppb (4) | 1.7 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 4.2 μg/m3 (18) | 18.0 | |
| Sept. 10, 2019, 10 p.m. | 6.3 ppb (6) | 2.9 ppb (3) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 6.0 | |
| Sept. 10, 2019, 9 p.m. | 2.9 ppb (3) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 1.5 μg/m3 (6) | 6.0 | |
| Sept. 10, 2019, 8 p.m. | 4.2 ppb (4) | 1.6 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 3.2 μg/m3 (13) | 13.0 | |
| Sept. 10, 2019, 7 p.m. | 3.9 ppb (4) | 1.8 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 2.9 μg/m3 (12) | 12.0 | |
| Sept. 10, 2019, 6 p.m. | 1.3 ppb (1) | 0.2 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 3.1 μg/m3 (13) | 13.0 | |
| Sept. 10, 2019, 5 p.m. | 0.9 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 4.6 μg/m3 (19) | 19.0 | |
| Sept. 10, 2019, 4 p.m. | 2.3 ppb (2) | 0.9 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 4.9 μg/m3 (20) | 20.0 | |
| Sept. 10, 2019, 3 p.m. | 3.6 ppb (3) | 1.2 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 0.7 μg/m3 (3) | 3.0 | |
| Sept. 10, 2019, 2 p.m. | 6.9 ppb (6) | 1.4 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 2.1 μg/m3 (9) | 9.0 | |
| Sept. 10, 2019, 1 p.m. | 0.8 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.9 μg/m3 (8) | 8.0 | |
| Sept. 10, 2019, noon | 1.5 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.1 μg/m3 (5) | 5.0 | |
| Sept. 10, 2019, 11 a.m. | 0.3 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 1.6 μg/m3 (7) | 7.0 | |
| Sept. 10, 2019, 10 a.m. | 0.4 ppb (0) | 0.1 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | N/A | |
| Sept. 10, 2019, 9 a.m. | 0.4 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 0.6 μg/m3 (2) | 2.0 | |
| Sept. 10, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 3.1 μg/m3 (13) | 13.0 | |
| Sept. 10, 2019, 7 a.m. | 0.2 ppb (0) | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | N/A | 1.7 μg/m3 (7) | 7.0 | |
| Sept. 10, 2019, 6 a.m. | 0.8 ppb (1) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.6 μg/m3 (11) | 11.0 | |
| Sept. 10, 2019, 5 a.m. | 0.9 ppb (1) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.9 μg/m3 (12) | 12.0 | |
| Sept. 10, 2019, 4 a.m. | 1.6 ppb (1) | 0.5 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.9 μg/m3 (12) | 12.0 | |
| Sept. 10, 2019, 3 a.m. | 1.3 ppb (1) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 3.4 μg/m3 (14) | 14.0 | |
| Sept. 10, 2019, 2 a.m. | 1.8 ppb (2) | 0.6 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.3 μg/m3 (5) | 5.0 | |
| Sept. 10, 2019, 1 a.m. | 4.3 ppb (4) | 1.4 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 0.7 μg/m3 (3) | 4.0 | |
| Sept. 10, 2019, midnight | 2.0 ppb (2) | 0.7 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 3.4 μg/m3 (14) | 14.0 | |
| Sept. 9, 2019, 11 p.m. | 2.9 ppb (3) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 5.4 μg/m3 (23) | 23.0 | |
| Sept. 9, 2019, 10 p.m. | 4.0 ppb (4) | 1.9 ppb (2) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 7.6 μg/m3 (32) | 32.0 | |
| Sept. 9, 2019, 9 p.m. | 2.5 ppb (2) | 0.8 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 8.6 μg/m3 (36) | 36.0 | |
| Sept. 9, 2019, 8 p.m. | 2.2 ppb (2) | 0.6 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 11.4 μg/m3 (48) | 48.0 | |
| Sept. 9, 2019, 7 p.m. | 2.6 ppb (2) | 0.7 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 8.7 μg/m3 (36) | 36.0 | |
| Sept. 9, 2019, 6 p.m. | 2.9 ppb (3) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 8.6 μg/m3 (36) | 36.0 | |
| Sept. 9, 2019, 5 p.m. | 3.3 ppb (3) | 1.1 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 10.3 μg/m3 (43) | 43.0 | |
| Sept. 9, 2019, 4 p.m. | 2.7 ppb (3) | 0.7 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 6.2 μg/m3 (26) | 26.0 | |
| Sept. 9, 2019, 3 p.m. | 2.2 ppb (2) | 0.5 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 5.4 μg/m3 (23) | 23.0 | |
| Sept. 9, 2019, 2 p.m. | 3.3 ppb (3) | 1.1 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 8.0 | |
| Sept. 9, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 1.2 μg/m3 (5) | 5.0 | |
| Sept. 9, 2019, noon | 1.3 ppb (1) | 0.0 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.3 μg/m3 (10) | 10.0 | |
| Sept. 9, 2019, 11 a.m. | 1.1 ppb (1) | 0.0 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 4.3 μg/m3 (18) | 18.0 | |
| Sept. 9, 2019, 10 a.m. | 1.8 ppb (2) | 0.5 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 3.9 μg/m3 (16) | 16.0 | |
| Sept. 9, 2019, 9 a.m. | 0.9 ppb (1) | 0.0 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 1.3 μg/m3 (5) | 5.0 | |
| Sept. 9, 2019, 8 a.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 | |
| Sept. 9, 2019, 7 a.m. | 1.2 ppb (1) | 0.0 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.7 μg/m3 (3) | 3.0 | |
| Sept. 9, 2019, 6 a.m. | 1.1 ppb (1) | 0.0 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 2.1 μg/m3 (9) | 9.0 | |
| Sept. 9, 2019, 5 a.m. | 0.9 ppb (1) | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 0.4 μg/m3 (2) | 2.0 | |
| Sept. 9, 2019, 4 a.m. | 0.6 ppb (1) | 0.0 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -0.5 μg/m3 (0) | 1.0 | |
| Sept. 9, 2019, 3 a.m. | 0.6 ppb (1) | 0.0 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | -0.5 μg/m3 (0) | 1.0 | |
| Sept. 9, 2019, 2 a.m. | 3.2 ppb (3) | 0.8 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | -0.1 μg/m3 (0) | 3.0 | |
| Sept. 9, 2019, 1 a.m. | 1.9 ppb (2) | 0.6 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 4.1 μg/m3 (17) | 17.0 |