Concord CA, US: 37.9383, -122.025
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 18, 2019, noon | 12.6 ppb (12) | 1.8 ppb (2) | N/A | 11.0 ppb (10) | N/A | 1.0 ppb (1) | 6.0 ppb (5) | 0.32 ppb (4) | N/A | -1.0 μg/m3 (0) | 12.0 | |
| March 18, 2019, 11 a.m. | 8.6 ppb (8) | 0.2 ppb (0) | N/A | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 9.0 ppb (7) | 0.33 ppb (4) | N/A | -1.0 μg/m3 (0) | 8.0 | |
| March 18, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | N/A | |
| March 18, 2019, 9 a.m. | 5.5 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 18.0 ppb (14) | 0.3 ppb (3) | N/A | -2.0 μg/m3 (0) | 14.0 | |
| March 18, 2019, 8 a.m. | 5.3 ppb (5) | 0.1 ppb (0) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 21.0 ppb (16) | 0.31 ppb (3) | N/A | -2.0 μg/m3 (0) | 16.0 | |
| March 18, 2019, 7 a.m. | 8.2 ppb (8) | 0.2 ppb (0) | N/A | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 18.0 ppb (14) | 0.48 ppb (5) | N/A | -1.0 μg/m3 (0) | 14.0 | |
| March 18, 2019, 6 a.m. | 4.7 ppb (4) | 0.1 ppb (0) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 27.0 ppb (21) | 0.4 ppb (4) | N/A | 0.0 μg/m3 (0) | 21.0 | |
| March 18, 2019, 5 a.m. | 3.3 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 33.0 ppb (25) | 0.31 ppb (3) | N/A | -1.0 μg/m3 (0) | 25.0 | |
| March 18, 2019, 4 a.m. | 3.9 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 34.0 ppb (26) | 0.34 ppb (4) | N/A | 0.0 μg/m3 (0) | 26.0 | |
| March 18, 2019, 3 a.m. | 4.9 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 40.0 ppb (31) | 0.38 ppb (4) | N/A | 1.0 μg/m3 (4) | 31.0 | |
| March 18, 2019, 2 a.m. | 5.6 ppb (5) | 0.1 ppb (0) | N/A | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 50.0 ppb (38) | 0.39 ppb (4) | N/A | -1.0 μg/m3 (0) | 38.0 | |
| March 18, 2019, 1 a.m. | 4.1 ppb (4) | 0.1 ppb (0) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 56.0 ppb (43) | 0.36 ppb (4) | N/A | -2.0 μg/m3 (0) | 43.0 | |
| March 18, 2019, midnight | 4.2 ppb (4) | 0.2 ppb (0) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 59.0 ppb (45) | 0.35 ppb (4) | N/A | -3.0 μg/m3 (0) | 45.0 | |
| March 17, 2019, 11 p.m. | 4.0 ppb (4) | 0.3 ppb (0) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 60.0 ppb (46) | 0.36 ppb (4) | N/A | -3.0 μg/m3 (0) | 46.0 | |
| March 17, 2019, 10 p.m. | 3.3 ppb (3) | 0.2 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 59.0 ppb (45) | 0.35 ppb (4) | N/A | -1.0 μg/m3 (0) | 45.0 | |
| March 17, 2019, 9 p.m. | 3.5 ppb (3) | 0.2 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 56.0 ppb (43) | 0.35 ppb (4) | N/A | -1.0 μg/m3 (0) | 43.0 | |
| March 17, 2019, 8 p.m. | 4.1 ppb (4) | 0.4 ppb (0) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 50.0 ppb (38) | 0.36 ppb (4) | N/A | 0.0 μg/m3 (0) | 38.0 | |
| March 17, 2019, 7 p.m. | 5.6 ppb (5) | 0.9 ppb (1) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 41.0 ppb (32) | 0.37 ppb (4) | N/A | -1.0 μg/m3 (0) | 32.0 | |
| March 17, 2019, 6 p.m. | 7.5 ppb (7) | 1.7 ppb (2) | N/A | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 34.0 ppb (26) | 0.38 ppb (4) | N/A | -1.0 μg/m3 (0) | 26.0 | |
| March 17, 2019, 5 p.m. | 13.6 ppb (13) | 4.6 ppb (4) | N/A | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 23.0 ppb (18) | 0.46 ppb (5) | N/A | -1.0 μg/m3 (0) | 18.0 | |
| March 17, 2019, 4 p.m. | 12.9 ppb (12) | 3.7 ppb (3) | N/A | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 19.0 ppb (15) | 0.44 ppb (5) | N/A | 0.0 μg/m3 (0) | 15.0 | |
| March 17, 2019, 3 p.m. | 12.9 ppb (12) | 3.6 ppb (3) | N/A | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 14.0 ppb (11) | 0.4 ppb (4) | N/A | 2.0 μg/m3 (8) | 12.0 | |
| March 17, 2019, 2 p.m. | 16.5 ppb (15) | 2.8 ppb (3) | N/A | 14.0 ppb (13) | N/A | 1.0 ppb (1) | 4.0 ppb (3) | 0.36 ppb (4) | N/A | 2.0 μg/m3 (8) | 15.0 | |
| March 17, 2019, 1 p.m. | 14.3 ppb (13) | 1.1 ppb (1) | N/A | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 5.0 ppb (4) | 0.36 ppb (4) | N/A | 0.0 μg/m3 (0) | 13.0 | |
| March 17, 2019, noon | 8.3 ppb (8) | 0.3 ppb (0) | N/A | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 11.0 ppb (8) | 0.31 ppb (3) | N/A | -1.0 μg/m3 (0) | 8.0 | |
| March 17, 2019, 11 a.m. | 7.1 ppb (7) | 0.1 ppb (0) | N/A | 7.0 ppb (6) | N/A | 2.0 ppb (3) | 13.0 ppb (10) | 0.33 ppb (4) | N/A | -2.0 μg/m3 (0) | 10.0 | |
| March 17, 2019, 10 a.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 | |
| March 17, 2019, 9 a.m. | 9.3 ppb (9) | 0.1 ppb (0) | N/A | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 15.0 ppb (12) | 0.41 ppb (5) | N/A | -1.0 μg/m3 (0) | 12.0 | |
| March 17, 2019, 8 a.m. | 8.5 ppb (8) | 0.1 ppb (0) | N/A | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 22.0 ppb (17) | 0.4 ppb (4) | N/A | 0.0 μg/m3 (0) | 17.0 | |
| March 17, 2019, 7 a.m. | 9.4 ppb (9) | 0.0 ppb (0) | N/A | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 23.0 ppb (18) | 0.45 ppb (5) | N/A | -3.0 μg/m3 (0) | 18.0 | |
| March 17, 2019, 6 a.m. | 8.6 ppb (8) | 0.1 ppb (0) | N/A | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 25.0 ppb (19) | 0.39 ppb (4) | N/A | -3.0 μg/m3 (0) | 19.0 | |
| March 17, 2019, 5 a.m. | 6.6 ppb (6) | 0.5 ppb (0) | N/A | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 31.0 ppb (24) | 0.33 ppb (4) | N/A | -3.0 μg/m3 (0) | 24.0 | |
| March 17, 2019, 4 a.m. | 7.3 ppb (7) | 0.0 ppb (0) | N/A | 7.0 ppb (6) | N/A | 1.0 ppb (1) | 30.0 ppb (23) | 0.36 ppb (4) | N/A | -3.0 μg/m3 (0) | 23.0 | |
| March 17, 2019, 3 a.m. | 7.8 ppb (7) | 0.1 ppb (0) | N/A | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 33.0 ppb (25) | 0.35 ppb (4) | N/A | -1.0 μg/m3 (0) | 25.0 | |
| March 17, 2019, 2 a.m. | 6.4 ppb (6) | 0.0 ppb (0) | N/A | 6.0 ppb (6) | N/A | 2.0 ppb (3) | 45.0 ppb (35) | 0.31 ppb (3) | N/A | 0.0 μg/m3 (0) | 35.0 | |
| March 17, 2019, 1 a.m. | 4.6 ppb (4) | 0.1 ppb (0) | N/A | 5.0 ppb (5) | N/A | 2.0 ppb (3) | 52.0 ppb (40) | 0.28 ppb (3) | N/A | -2.0 μg/m3 (0) | 40.0 | |
| March 17, 2019, midnight | 4.4 ppb (4) | 0.3 ppb (0) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 55.0 ppb (42) | 0.27 ppb (3) | N/A | -3.0 μg/m3 (0) | 42.0 | |
| March 16, 2019, 11 p.m. | 2.9 ppb (3) | 0.3 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 58.0 ppb (45) | 0.25 ppb (3) | N/A | -3.0 μg/m3 (0) | 45.0 | |
| March 16, 2019, 10 p.m. | 2.3 ppb (2) | 0.1 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 58.0 ppb (45) | 0.25 ppb (3) | N/A | -2.0 μg/m3 (0) | 45.0 | |
| March 16, 2019, 9 p.m. | 2.8 ppb (3) | 0.2 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 56.0 ppb (43) | 0.28 ppb (3) | N/A | -3.0 μg/m3 (0) | 43.0 | |
| March 16, 2019, 8 p.m. | 3.8 ppb (4) | 0.4 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 51.0 ppb (39) | 0.3 ppb (3) | N/A | -4.0 μg/m3 (0) | 39.0 | |
| March 16, 2019, 7 p.m. | 5.8 ppb (5) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 45.0 ppb (35) | 0.35 ppb (4) | N/A | N/A | 35.0 | |
| March 16, 2019, 6 p.m. | 7.6 ppb (7) | 1.7 ppb (2) | N/A | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 36.0 ppb (28) | 0.35 ppb (4) | N/A | -4.0 μg/m3 (0) | 28.0 | |
| March 16, 2019, 5 p.m. | 15.2 ppb (14) | 4.7 ppb (4) | N/A | 10.0 ppb (9) | N/A | 1.0 ppb (1) | 26.0 ppb (20) | 0.44 ppb (5) | N/A | 0.0 μg/m3 (0) | 20.0 | |
| March 16, 2019, 4 p.m. | 14.5 ppb (13) | 4.6 ppb (4) | N/A | 10.0 ppb (9) | N/A | 1.0 ppb (1) | 21.0 ppb (16) | 0.41 ppb (5) | N/A | -1.0 μg/m3 (0) | 16.0 | |
| March 16, 2019, 3 p.m. | 27.7 ppb (26) | 11.5 ppb (11) | N/A | 16.0 ppb (15) | N/A | 1.0 ppb (1) | 8.0 ppb (6) | 0.37 ppb (4) | N/A | -3.0 μg/m3 (0) | 26.0 | |
| March 16, 2019, 2 p.m. | 27.2 ppb (25) | 10.1 ppb (9) | N/A | 17.0 ppb (16) | N/A | 1.0 ppb (1) | 2.0 ppb (2) | 0.35 ppb (4) | N/A | -3.0 μg/m3 (0) | 25.0 | |
| March 16, 2019, 1 p.m. | 17.3 ppb (16) | 1.7 ppb (2) | N/A | 16.0 ppb (15) | N/A | 1.0 ppb (1) | 3.0 ppb (2) | 0.31 ppb (3) | N/A | -2.0 μg/m3 (0) | 16.0 | |
| March 16, 2019, noon | 12.7 ppb (12) | 0.3 ppb (0) | N/A | 12.0 ppb (11) | N/A | 1.0 ppb (1) | 7.0 ppb (5) | 0.31 ppb (3) | N/A | -1.0 μg/m3 (0) | 12.0 | |
| March 16, 2019, 11 a.m. | 11.1 ppb (10) | 0.2 ppb (0) | N/A | 11.0 ppb (10) | N/A | 1.0 ppb (1) | 10.0 ppb (8) | 0.33 ppb (4) | N/A | -2.0 μg/m3 (0) | 10.0 | |
| March 16, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | N/A | |
| March 16, 2019, 9 a.m. | 7.8 ppb (7) | 0.1 ppb (0) | N/A | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 16.0 ppb (12) | 0.31 ppb (3) | N/A | -1.0 μg/m3 (0) | 12.0 | |
| March 16, 2019, 8 a.m. | 6.1 ppb (6) | 0.1 ppb (0) | N/A | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 23.0 ppb (18) | 0.3 ppb (3) | N/A | -2.0 μg/m3 (0) | 18.0 | |
| March 16, 2019, 7 a.m. | 4.9 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 28.0 ppb (22) | 0.3 ppb (3) | N/A | 0.0 μg/m3 (0) | 22.0 | |
| March 16, 2019, 6 a.m. | 5.3 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 30.0 ppb (23) | 0.31 ppb (3) | N/A | 2.0 μg/m3 (8) | 23.0 | |
| March 16, 2019, 5 a.m. | 6.3 ppb (6) | 0.0 ppb (0) | N/A | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 29.0 ppb (22) | 0.33 ppb (4) | N/A | 2.0 μg/m3 (8) | 22.0 | |
| March 16, 2019, 4 a.m. | 8.5 ppb (8) | 0.0 ppb (0) | N/A | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 28.0 ppb (22) | 0.37 ppb (4) | N/A | 0.0 μg/m3 (0) | 22.0 | |
| March 16, 2019, 3 a.m. | 9.5 ppb (9) | 0.0 ppb (0) | N/A | 10.0 ppb (9) | N/A | 1.0 ppb (1) | 33.0 ppb (25) | 0.38 ppb (4) | N/A | 0.0 μg/m3 (0) | 25.0 | |
| March 16, 2019, 2 a.m. | 9.0 ppb (8) | 0.4 ppb (0) | N/A | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 44.0 ppb (34) | 0.35 ppb (4) | N/A | 2.0 μg/m3 (8) | 34.0 | |
| March 16, 2019, 1 a.m. | 5.7 ppb (5) | 0.5 ppb (0) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 53.0 ppb (41) | 0.32 ppb (4) | N/A | 2.0 μg/m3 (8) | 41.0 | |
| March 16, 2019, midnight | 3.4 ppb (3) | 0.3 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 55.0 ppb (42) | 0.28 ppb (3) | N/A | -1.0 μg/m3 (0) | 42.0 | |
| March 15, 2019, 11 p.m. | 2.8 ppb (3) | 0.2 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 55.0 ppb (42) | 0.27 ppb (3) | N/A | -1.0 μg/m3 (0) | 42.0 | |
| March 15, 2019, 10 p.m. | 3.6 ppb (3) | 0.3 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 54.0 ppb (42) | 0.29 ppb (3) | N/A | 2.0 μg/m3 (8) | 42.0 | |
| March 15, 2019, 9 p.m. | 3.9 ppb (4) | 0.4 ppb (0) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 52.0 ppb (40) | 0.3 ppb (3) | N/A | 3.0 μg/m3 (12) | 40.0 | |
| March 15, 2019, 8 p.m. | 5.0 ppb (5) | 0.9 ppb (1) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 50.0 ppb (38) | 0.31 ppb (3) | N/A | 1.0 μg/m3 (4) | 38.0 | |
| March 15, 2019, 7 p.m. | 4.8 ppb (4) | 0.9 ppb (1) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 45.0 ppb (35) | 0.3 ppb (3) | N/A | 1.0 μg/m3 (4) | 35.0 | |
| March 15, 2019, 6 p.m. | 5.8 ppb (5) | 1.5 ppb (1) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 32.0 ppb (25) | 0.29 ppb (3) | N/A | N/A | 25.0 | |
| March 15, 2019, 5 p.m. | 5.9 ppb (5) | 1.5 ppb (1) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 31.0 ppb (24) | 0.27 ppb (3) | N/A | 4.0 μg/m3 (17) | 24.0 | |
| March 15, 2019, 4 p.m. | 21.0 ppb (19) | 7.7 ppb (7) | N/A | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 19.0 ppb (15) | 0.4 ppb (4) | N/A | 4.0 μg/m3 (17) | 19.0 | |
| March 15, 2019, 3 p.m. | 36.4 ppb (34) | 16.0 ppb (15) | N/A | 21.0 ppb (19) | N/A | 1.0 ppb (1) | 8.0 ppb (6) | 0.45 ppb (5) | N/A | 4.0 μg/m3 (17) | 34.0 | |
| March 15, 2019, 2 p.m. | 51.8 ppb (48) | 29.7 ppb (28) | N/A | 22.0 ppb (20) | N/A | 1.0 ppb (1) | 1.0 ppb (1) | 0.55 ppb (6) | N/A | 4.0 μg/m3 (17) | 48.0 | |
| March 15, 2019, 1 p.m. | 24.4 ppb (23) | 5.4 ppb (5) | N/A | 19.0 ppb (18) | N/A | 1.0 ppb (1) | 1.0 ppb (1) | 0.29 ppb (3) | N/A | 4.0 μg/m3 (17) | 23.0 | |
| March 15, 2019, noon | 19.8 ppb (18) | 3.0 ppb (3) | N/A | 17.0 ppb (16) | N/A | 1.0 ppb (1) | 3.0 ppb (2) | 0.27 ppb (3) | N/A | 2.0 μg/m3 (8) | 18.0 | |
| March 15, 2019, 11 a.m. | 12.1 ppb (11) | 0.4 ppb (0) | N/A | 12.0 ppb (11) | N/A | 2.0 ppb (3) | 10.0 ppb (8) | 0.23 ppb (3) | N/A | 2.0 μg/m3 (8) | 11.0 | |
| March 15, 2019, 10 a.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 | |
| March 15, 2019, 9 a.m. | 12.6 ppb (12) | 0.5 ppb (0) | N/A | 12.0 ppb (11) | N/A | 1.0 ppb (1) | 6.0 ppb (5) | 0.31 ppb (3) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| March 15, 2019, 8 a.m. | 12.9 ppb (12) | 0.4 ppb (0) | N/A | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 8.0 ppb (6) | 0.3 ppb (3) | N/A | 2.0 μg/m3 (8) | 12.0 | |
| March 15, 2019, 7 a.m. | 6.5 ppb (6) | 0.1 ppb (0) | N/A | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 21.0 ppb (16) | 0.24 ppb (3) | N/A | 1.0 μg/m3 (4) | 16.0 | |
| March 15, 2019, 6 a.m. | 4.5 ppb (4) | 0.1 ppb (0) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 28.0 ppb (22) | 0.24 ppb (3) | N/A | 2.0 μg/m3 (8) | 22.0 | |
| March 15, 2019, 5 a.m. | 4.9 ppb (5) | 0.1 ppb (0) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 29.0 ppb (22) | 0.22 ppb (2) | N/A | 3.0 μg/m3 (12) | 22.0 | |
| March 15, 2019, 4 a.m. | 6.2 ppb (6) | 0.1 ppb (0) | N/A | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 28.0 ppb (22) | 0.26 ppb (3) | N/A | 2.0 μg/m3 (8) | 22.0 | |
| March 15, 2019, 3 a.m. | 5.5 ppb (5) | 0.1 ppb (0) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 32.0 ppb (25) | 0.25 ppb (3) | N/A | 0.0 μg/m3 (0) | 25.0 | |
| March 15, 2019, 2 a.m. | 7.6 ppb (7) | 0.2 ppb (0) | N/A | 7.0 ppb (6) | N/A | 1.0 ppb (1) | 36.0 ppb (28) | 0.29 ppb (3) | N/A | 0.0 μg/m3 (0) | 28.0 | |
| March 15, 2019, 1 a.m. | 3.0 ppb (3) | 0.2 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 47.0 ppb (36) | 0.23 ppb (3) | N/A | 1.0 μg/m3 (4) | 36.0 | |
| March 15, 2019, midnight | 2.6 ppb (2) | 0.3 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 48.0 ppb (37) | 0.22 ppb (2) | N/A | 0.0 μg/m3 (0) | 37.0 | |
| March 14, 2019, 11 p.m. | 1.8 ppb (2) | 0.2 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 50.0 ppb (38) | 0.2 ppb (2) | N/A | 3.0 μg/m3 (12) | 38.0 | |
| March 14, 2019, 10 p.m. | 2.6 ppb (2) | 0.5 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 50.0 ppb (38) | 0.2 ppb (2) | N/A | 2.0 μg/m3 (8) | 38.0 | |
| March 14, 2019, 9 p.m. | 5.2 ppb (5) | 2.5 ppb (2) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 48.0 ppb (37) | 0.21 ppb (2) | N/A | -1.0 μg/m3 (0) | 37.0 | |
| March 14, 2019, 8 p.m. | 2.4 ppb (2) | 0.5 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 47.0 ppb (36) | 0.21 ppb (2) | N/A | -1.0 μg/m3 (0) | 36.0 | |
| March 14, 2019, 7 p.m. | 2.1 ppb (2) | 0.4 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 44.0 ppb (34) | 0.21 ppb (2) | N/A | 1.0 μg/m3 (4) | 34.0 | |
| March 14, 2019, 6 p.m. | 2.3 ppb (2) | 0.5 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 42.0 ppb (32) | 0.23 ppb (3) | N/A | 2.0 μg/m3 (8) | 32.0 | |
| March 14, 2019, 5 p.m. | 2.8 ppb (3) | 0.6 ppb (1) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 40.0 ppb (31) | 0.26 ppb (3) | N/A | 2.0 μg/m3 (8) | 31.0 | |
| March 14, 2019, 4 p.m. | 16.6 ppb (15) | 7.8 ppb (7) | N/A | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 31.0 ppb (24) | 0.37 ppb (4) | N/A | 4.0 μg/m3 (17) | 24.0 | |
| March 14, 2019, 3 p.m. | 66.3 ppb (63) | 41.7 ppb (39) | N/A | 25.0 ppb (23) | N/A | 1.0 ppb (1) | 4.0 ppb (3) | 0.81 ppb (9) | N/A | 5.0 μg/m3 (21) | 63.0 | |
| March 14, 2019, 2 p.m. | 65.7 ppb (62) | 42.5 ppb (39) | N/A | 23.0 ppb (21) | N/A | 1.0 ppb (1) | 1.0 ppb (1) | 0.58 ppb (6) | N/A | 3.0 μg/m3 (12) | 62.0 | |
| March 14, 2019, 1 p.m. | 33.5 ppb (31) | 13.2 ppb (12) | N/A | 20.0 ppb (19) | N/A | 1.0 ppb (1) | 0.0 ppb (0) | 0.37 ppb (4) | N/A | 3.0 μg/m3 (12) | 31.0 | |
| March 14, 2019, noon | 21.1 ppb (20) | 3.8 ppb (4) | N/A | 17.0 ppb (16) | N/A | 1.0 ppb (1) | 1.0 ppb (1) | 0.3 ppb (3) | N/A | 4.0 μg/m3 (17) | 20.0 | |
| March 14, 2019, 11 a.m. | 15.8 ppb (15) | 0.9 ppb (1) | N/A | 15.0 ppb (14) | N/A | 1.0 ppb (1) | 4.0 ppb (3) | 0.28 ppb (3) | N/A | N/A | 15.0 | |
| March 14, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | |
| March 14, 2019, 9 a.m. | 13.7 ppb (13) | 0.6 ppb (1) | N/A | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 5.0 ppb (4) | 0.36 ppb (4) | N/A | N/A | 13.0 | |
| March 14, 2019, 8 a.m. | 12.4 ppb (11) | 0.4 ppb (0) | N/A | 12.0 ppb (11) | N/A | 1.0 ppb (1) | 7.0 ppb (5) | 0.35 ppb (4) | N/A | N/A | 11.0 | |
| March 14, 2019, 7 a.m. | 8.4 ppb (8) | 0.1 ppb (0) | N/A | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 15.0 ppb (12) | 0.29 ppb (3) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| March 14, 2019, 6 a.m. | 6.6 ppb (6) | 0.1 ppb (0) | N/A | 7.0 ppb (6) | N/A | 1.0 ppb (1) | 19.0 ppb (15) | 0.28 ppb (3) | N/A | 1.0 μg/m3 (4) | 15.0 | |
| March 14, 2019, 5 a.m. | 7.6 ppb (7) | 0.1 ppb (0) | N/A | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 20.0 ppb (15) | 0.28 ppb (3) | N/A | 2.0 μg/m3 (8) | 15.0 | |
| March 14, 2019, 4 a.m. | 9.6 ppb (9) | 0.1 ppb (0) | N/A | 10.0 ppb (9) | N/A | 1.0 ppb (1) | 22.0 ppb (17) | 0.34 ppb (4) | N/A | 3.0 μg/m3 (12) | 17.0 | |
| March 14, 2019, 3 a.m. | 6.1 ppb (6) | 0.4 ppb (0) | N/A | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 30.0 ppb (23) | 0.3 ppb (3) | N/A | 2.0 μg/m3 (8) | 23.0 | |
| March 14, 2019, 2 a.m. | 6.7 ppb (6) | 0.4 ppb (0) | N/A | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 36.0 ppb (28) | 0.29 ppb (3) | N/A | 1.0 μg/m3 (4) | 28.0 | |
| March 14, 2019, 1 a.m. | 4.7 ppb (4) | 0.4 ppb (0) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 45.0 ppb (35) | 0.27 ppb (3) | N/A | 2.0 μg/m3 (8) | 35.0 | |
| March 14, 2019, midnight | 3.1 ppb (3) | 0.3 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 49.0 ppb (38) | 0.27 ppb (3) | N/A | 1.0 μg/m3 (4) | 38.0 | |
| March 13, 2019, 11 p.m. | 2.6 ppb (2) | 0.3 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 49.0 ppb (38) | 0.27 ppb (3) | N/A | 0.0 μg/m3 (0) | 38.0 | |
| March 13, 2019, 10 p.m. | 2.3 ppb (2) | 0.3 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 49.0 ppb (38) | 0.26 ppb (3) | N/A | -1.0 μg/m3 (0) | 38.0 | |
| March 13, 2019, 9 p.m. | 2.9 ppb (3) | 0.5 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 45.0 ppb (35) | 0.25 ppb (3) | N/A | -1.0 μg/m3 (0) | 35.0 | |
| March 13, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | N/A | |
| March 13, 2019, 7 p.m. | 2.9 ppb (3) | 0.7 ppb (1) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 43.0 ppb (33) | 0.23 ppb (3) | N/A | -1.0 μg/m3 (0) | 33.0 | |
| March 13, 2019, 6 p.m. | 2.7 ppb (3) | 0.6 ppb (1) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 42.0 ppb (32) | 0.23 ppb (3) | N/A | 0.0 μg/m3 (0) | 32.0 | |
| March 13, 2019, 5 p.m. | 12.7 ppb (12) | 4.3 ppb (4) | N/A | 8.0 ppb (7) | N/A | 1.0 ppb (1) | 33.0 ppb (25) | 0.29 ppb (3) | N/A | -1.0 μg/m3 (0) | 25.0 | |
| March 13, 2019, 4 p.m. | 14.0 ppb (13) | 4.7 ppb (4) | N/A | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 25.0 ppb (19) | 0.3 ppb (3) | N/A | 2.0 μg/m3 (8) | 19.0 | |
| March 13, 2019, 3 p.m. | 30.7 ppb (28) | 12.3 ppb (11) | N/A | 18.0 ppb (17) | N/A | 1.0 ppb (1) | 11.0 ppb (8) | 0.38 ppb (4) | N/A | 4.0 μg/m3 (17) | 28.0 | |
| March 13, 2019, 2 p.m. | 31.4 ppb (29) | 8.3 ppb (8) | N/A | 23.0 ppb (21) | N/A | 1.0 ppb (1) | 4.0 ppb (3) | 0.37 ppb (4) | N/A | 1.0 μg/m3 (4) | 29.0 | |
| March 13, 2019, 1 p.m. | 17.6 ppb (16) | 1.0 ppb (1) | N/A | 17.0 ppb (16) | N/A | 1.0 ppb (1) | 7.0 ppb (5) | 0.28 ppb (3) | N/A | 0.0 μg/m3 (0) | 16.0 | |
| March 13, 2019, noon | 11.9 ppb (11) | 0.4 ppb (0) | N/A | 12.0 ppb (11) | N/A | 1.0 ppb (1) | 13.0 ppb (10) | 0.23 ppb (3) | N/A | 1.0 μg/m3 (4) | 11.0 | |
| March 13, 2019, 11 a.m. | 9.1 ppb (8) | 0.3 ppb (0) | N/A | 9.0 ppb (8) | N/A | 2.0 ppb (3) | 16.0 ppb (12) | 0.22 ppb (2) | N/A | 0.0 μg/m3 (0) | 12.0 | |
| March 13, 2019, 10 a.m. | 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 | |
| March 13, 2019, 9 a.m. | 4.6 ppb (4) | 0.1 ppb (0) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 24.0 ppb (18) | 0.22 ppb (2) | N/A | 0.0 μg/m3 (0) | 18.0 | |
| March 13, 2019, 8 a.m. | 5.1 ppb (5) | 0.1 ppb (0) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 24.0 ppb (18) | 0.21 ppb (2) | N/A | 2.0 μg/m3 (8) | 18.0 | |
| March 13, 2019, 7 a.m. | 5.9 ppb (5) | 0.2 ppb (0) | N/A | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 25.0 ppb (19) | 0.23 ppb (3) | N/A | 1.0 μg/m3 (4) | 19.0 | |
| March 13, 2019, 6 a.m. | 2.9 ppb (3) | 0.1 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 36.0 ppb (28) | 0.21 ppb (2) | N/A | 2.0 μg/m3 (8) | 28.0 | |
| March 13, 2019, 5 a.m. | 2.4 ppb (2) | 0.1 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 38.0 ppb (29) | 0.22 ppb (2) | N/A | 4.0 μg/m3 (17) | 29.0 | |
| March 13, 2019, 4 a.m. | 2.3 ppb (2) | 0.1 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 39.0 ppb (30) | 0.22 ppb (2) | N/A | 4.0 μg/m3 (17) | 30.0 | |
| March 13, 2019, 3 a.m. | 2.2 ppb (2) | 0.2 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 40.0 ppb (31) | 0.22 ppb (2) | N/A | 3.0 μg/m3 (12) | 31.0 | |
| March 13, 2019, 2 a.m. | 2.2 ppb (2) | 0.2 ppb (0) | N/A | 2.0 ppb (2) | N/A | 1.0 ppb (1) | 41.0 ppb (32) | 0.22 ppb (2) | N/A | 2.0 μg/m3 (8) | 32.0 | |
| March 13, 2019, 1 a.m. | 2.1 ppb (2) | 0.3 ppb (0) | N/A | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 42.0 ppb (32) | 0.23 ppb (3) | N/A | 4.0 μg/m3 (17) | 32.0 | |
| March 13, 2019, midnight | 1.7 ppb (2) | 0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.22 ppb (2) | N/A | 4.0 μg/m3 (17) | 34.0 | |
| March 12, 2019, 11 p.m. | 1.9 ppb (2) | 0.4 ppb (0) | N/A | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.21 ppb (2) | N/A | 3.0 μg/m3 (12) | 35.0 | |
| March 12, 2019, 10 p.m. | 1.7 ppb (2) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.21 ppb (2) | N/A | 4.0 μg/m3 (17) | 36.0 | |
| March 12, 2019, 9 p.m. | 1.7 ppb (2) | 0.5 ppb (0) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.23 ppb (3) | N/A | -1.0 μg/m3 (0) | 33.0 | |
| March 12, 2019, 8 p.m. | 1.6 ppb (1) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | 39.0 ppb (30) | 0.22 ppb (2) | N/A | -1.0 μg/m3 (0) | 30.0 | |
| March 12, 2019, 7 p.m. | 1.7 ppb (2) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | 1.0 ppb (1) | 39.0 ppb (30) | 0.25 ppb (3) | N/A | 2.0 μg/m3 (8) | 30.0 | |
| March 12, 2019, 6 p.m. | 1.8 ppb (2) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | 40.0 ppb (31) | 0.22 ppb (2) | N/A | 2.0 μg/m3 (8) | 31.0 | |
| March 12, 2019, 5 p.m. | 3.2 ppb (3) | 0.6 ppb (1) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 38.0 ppb (29) | 0.19 ppb (2) | N/A | 4.0 μg/m3 (17) | 29.0 | |
| March 12, 2019, 4 p.m. | 6.8 ppb (6) | 1.5 ppb (1) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 29.0 ppb (22) | 0.23 ppb (3) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 12, 2019, 3 p.m. | 14.0 ppb (13) | 3.9 ppb (4) | N/A | 10.0 ppb (9) | N/A | 1.0 ppb (1) | 18.0 ppb (14) | 0.3 ppb (3) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 12, 2019, 2 p.m. | 19.6 ppb (18) | 2.5 ppb (2) | N/A | 17.0 ppb (16) | N/A | 1.0 ppb (1) | 8.0 ppb (6) | 0.32 ppb (4) | N/A | 0.0 μg/m3 (0) | 18.0 | |
| March 12, 2019, 1 p.m. | 13.3 ppb (12) | 0.6 ppb (1) | N/A | 13.0 ppb (12) | N/A | 1.0 ppb (1) | 11.0 ppb (8) | 0.24 ppb (3) | N/A | 2.0 μg/m3 (8) | 12.0 | |
| March 12, 2019, noon | 9.5 ppb (9) | 0.5 ppb (0) | N/A | 9.0 ppb (8) | N/A | 1.0 ppb (1) | 15.0 ppb (12) | 0.22 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 12, 2019, 11 a.m. | 5.6 ppb (5) | 0.1 ppb (0) | N/A | 6.0 ppb (6) | N/A | 1.0 ppb (1) | 17.0 ppb (13) | 0.19 ppb (2) | N/A | 3.0 μg/m3 (12) | 13.0 | |
| March 12, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 12, 2019, 9 a.m. | 3.2 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 23.0 ppb (18) | 0.18 ppb (2) | N/A | 3.0 μg/m3 (12) | 18.0 | |
| March 12, 2019, 8 a.m. | 2.8 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 25.0 ppb (19) | 0.18 ppb (2) | N/A | 3.0 μg/m3 (12) | 19.0 | |
| March 12, 2019, 7 a.m. | 4.5 ppb (4) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 22.0 ppb (17) | 0.19 ppb (2) | N/A | 1.0 μg/m3 (4) | 17.0 | |
| March 12, 2019, 6 a.m. | 3.7 ppb (3) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 23.0 ppb (18) | 0.2 ppb (2) | N/A | 0.0 μg/m3 (0) | 18.0 | |
| March 12, 2019, 5 a.m. | 4.4 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 24.0 ppb (18) | 0.21 ppb (2) | N/A | 0.0 μg/m3 (0) | 18.0 | |
| March 12, 2019, 4 a.m. | 6.6 ppb (6) | 0.0 ppb (0) | N/A | 7.0 ppb (6) | N/A | 1.0 ppb (1) | 23.0 ppb (18) | 0.26 ppb (3) | N/A | 2.0 μg/m3 (8) | 18.0 | |
| March 12, 2019, 3 a.m. | 5.2 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | 1.0 ppb (1) | 30.0 ppb (23) | 0.24 ppb (3) | N/A | 0.0 μg/m3 (0) | 23.0 | |
| March 12, 2019, 2 a.m. | 3.2 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 36.0 ppb (28) | 0.22 ppb (2) | N/A | -1.0 μg/m3 (0) | 28.0 | |
| March 12, 2019, 1 a.m. | 3.5 ppb (3) | 0.2 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 42.0 ppb (32) | 0.2 ppb (2) | N/A | 1.0 μg/m3 (4) | 32.0 | |
| March 12, 2019, midnight | 4.1 ppb (4) | 0.5 ppb (0) | N/A | 4.0 ppb (4) | N/A | 1.0 ppb (1) | 42.0 ppb (32) | 0.21 ppb (2) | N/A | 0.0 μg/m3 (0) | 32.0 | |
| March 11, 2019, 11 p.m. | 3.2 ppb (3) | 0.5 ppb (0) | N/A | 3.0 ppb (3) | N/A | 1.0 ppb (1) | 43.0 ppb (33) | 0.19 ppb (2) | N/A | 0.0 μg/m3 (0) | 33.0 | |
| March 11, 2019, 10 p.m. | 2.4 ppb (2) | 0.4 ppb (0) | N/A | 2.0 ppb (2) | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.18 ppb (2) | N/A | 0.0 μg/m3 (0) | 33.0 | |
| March 11, 2019, 9 p.m. | 2.3 ppb (2) | 0.4 ppb (0) | N/A | N/A | N/A | 1.0 ppb (1) | 41.0 ppb (32) | 0.2 ppb (2) | N/A | -1.0 μg/m3 (0) | 32.0 | |
| March 11, 2019, 8 p.m. | 73.1 ppb (70) | 34.4 ppb (32) | N/A | N/A | N/A | 40.0 ppb (52) | 23.0 ppb (18) | 4.07 ppb (45) | N/A | 0.0 μg/m3 (0) | 70.0 | |
| March 11, 2019, 7 p.m. | 485.4 ppb (172) | 332.1 ppb (144) | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 1.0 μg/m3 (4) | 172.0 | |
| March 11, 2019, 6 p.m. | 66.1 ppb (63) | 66.0 ppb (63) | N/A | 0.0 ppb (0) | N/A | 31.0 ppb (44) | N/A | 0.06 ppb (1) | N/A | 2.0 μg/m3 (8) | 63.0 | |
| March 11, 2019, 5 p.m. | 0.9 ppb (1) | 0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | 1.0 ppb (1) | N/A | 0.07 ppb (1) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| March 11, 2019, 4 p.m. | 21.7 ppb (20) | 9.8 ppb (9) | N/A | 12.0 ppb (11) | N/A | 1.0 ppb (1) | 15.0 ppb (12) | 0.44 ppb (5) | N/A | 3.0 μg/m3 (12) | 20.0 | |
| March 11, 2019, 3 p.m. | 41.9 ppb (39) | 25.8 ppb (24) | N/A | 16.0 ppb (15) | N/A | 1.0 ppb (1) | 4.0 ppb (3) | 0.51 ppb (6) | N/A | 2.0 μg/m3 (8) | 39.0 | |
| March 11, 2019, 2 p.m. | 40.2 ppb (37) | 25.9 ppb (24) | N/A | 14.0 ppb (13) | N/A | 1.0 ppb (1) | 0.0 ppb (0) | 0.4 ppb (4) | N/A | 0.0 μg/m3 (0) | 37.0 | |
| March 11, 2019, 1 p.m. | 29.7 ppb (28) | 16.1 ppb (15) | N/A | 14.0 ppb (13) | N/A | 1.0 ppb (1) | 0.0 ppb (0) | 0.33 ppb (4) | N/A | 3.0 μg/m3 (12) | 28.0 |