Milwaukee (Maitland Park) WI, US: 42.93257, -87.93434
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. 25, 2020, 7 p.m. | N/A | N/A | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.35 ppb (4) | 7.0 μg/m3 (6) | 4.5 μg/m3 (19) | 19.0 | |
| Jan. 25, 2020, 6 p.m. | N/A | N/A | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.36 ppb (4) | 10.0 μg/m3 (9) | 5.6 μg/m3 (23) | 23.0 | |
| Jan. 25, 2020, 5 p.m. | N/A | N/A | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.42 ppb (5) | 12.0 μg/m3 (11) | 6.9 μg/m3 (29) | 29.0 | |
| Jan. 25, 2020, 4 p.m. | N/A | N/A | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.39 ppb (4) | 14.0 μg/m3 (13) | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 25, 2020, 3 p.m. | N/A | N/A | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.38 ppb (4) | 15.0 μg/m3 (14) | 8.7 μg/m3 (36) | 36.0 | |
| Jan. 25, 2020, 2 p.m. | N/A | N/A | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.39 ppb (4) | 15.0 μg/m3 (14) | 9.2 μg/m3 (38) | 38.0 | |
| Jan. 25, 2020, 1 p.m. | N/A | N/A | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.37 ppb (4) | 15.0 μg/m3 (14) | 10.4 μg/m3 (43) | 43.0 | |
| Jan. 25, 2020, noon | N/A | N/A | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.35 ppb (4) | 12.0 μg/m3 (11) | 9.5 μg/m3 (40) | 40.0 | |
| Jan. 25, 2020, 11 a.m. | N/A | N/A | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.35 ppb (4) | 11.0 μg/m3 (10) | 9.5 μg/m3 (40) | 40.0 | |
| Jan. 25, 2020, 10 a.m. | N/A | N/A | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.37 ppb (4) | 11.0 μg/m3 (10) | 9.7 μg/m3 (40) | 40.0 | |
| Jan. 25, 2020, 9 a.m. | N/A | N/A | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.37 ppb (4) | 11.0 μg/m3 (10) | 9.2 μg/m3 (38) | 38.0 | |
| Jan. 25, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (11) | 10.4 μg/m3 (43) | 43.0 | |
| Jan. 25, 2020, 7 a.m. | N/A | N/A | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.39 ppb (4) | 13.0 μg/m3 (12) | 10.6 μg/m3 (44) | 44.0 | |
| Jan. 25, 2020, 6 a.m. | N/A | N/A | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.42 ppb (5) | 14.0 μg/m3 (13) | 11.0 μg/m3 (46) | 46.0 | |
| Jan. 25, 2020, 5 a.m. | N/A | N/A | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.42 ppb (5) | 16.0 μg/m3 (15) | 10.3 μg/m3 (43) | 43.0 | |
| Jan. 25, 2020, 4 a.m. | N/A | N/A | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.45 ppb (5) | 13.0 μg/m3 (12) | 9.1 μg/m3 (38) | 38.0 | |
| Jan. 25, 2020, 3 a.m. | N/A | N/A | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.48 ppb (5) | 14.0 μg/m3 (13) | 9.8 μg/m3 (41) | 41.0 | |
| Jan. 25, 2020, 2 a.m. | N/A | N/A | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.5 ppb (6) | 18.0 μg/m3 (16) | 12.3 μg/m3 (51) | 51.0 | |
| Jan. 25, 2020, 1 a.m. | N/A | N/A | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.45 ppb (5) | 13.0 μg/m3 (12) | 9.9 μg/m3 (41) | 41.0 | |
| Jan. 25, 2020, midnight | N/A | N/A | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.39 ppb (4) | 10.0 μg/m3 (9) | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 24, 2020, 11 p.m. | N/A | N/A | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.38 ppb (4) | 8.0 μg/m3 (7) | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 24, 2020, 10 p.m. | N/A | N/A | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.27 ppb (3) | 7.0 μg/m3 (6) | 5.1 μg/m3 (21) | 21.0 | |
| Jan. 24, 2020, 9 p.m. | N/A | N/A | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.27 ppb (3) | 9.0 μg/m3 (8) | 7.5 μg/m3 (31) | 31.0 | |
| Jan. 24, 2020, 8 p.m. | N/A | N/A | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.27 ppb (3) | 9.0 μg/m3 (8) | 8.1 μg/m3 (34) | 34.0 | |
| Jan. 24, 2020, 7 p.m. | N/A | N/A | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.25 ppb (3) | 9.0 μg/m3 (8) | 8.1 μg/m3 (34) | 34.0 | |
| Jan. 24, 2020, 6 p.m. | N/A | N/A | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.25 ppb (3) | 10.0 μg/m3 (9) | 9.2 μg/m3 (38) | 38.0 | |
| Jan. 24, 2020, 5 p.m. | N/A | N/A | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.25 ppb (3) | 11.0 μg/m3 (10) | 9.3 μg/m3 (39) | 39.0 | |
| Jan. 24, 2020, 4 p.m. | N/A | N/A | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.24 ppb (3) | 11.0 μg/m3 (10) | 9.7 μg/m3 (40) | 40.0 | |
| Jan. 24, 2020, 3 p.m. | N/A | N/A | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.25 ppb (3) | 13.0 μg/m3 (12) | 11.0 μg/m3 (46) | 46.0 | |
| Jan. 24, 2020, noon | N/A | N/A | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.26 ppb (3) | 15.0 μg/m3 (14) | 14.0 μg/m3 (54) | 54.0 | |
| Jan. 24, 2020, 11 a.m. | N/A | N/A | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.26 ppb (3) | 15.0 μg/m3 (14) | 14.7 μg/m3 (56) | 56.0 | |
| Jan. 24, 2020, 10 a.m. | N/A | N/A | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.26 ppb (3) | 16.0 μg/m3 (15) | 15.6 μg/m3 (58) | 58.0 | |
| Jan. 24, 2020, 9 a.m. | N/A | N/A | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.25 ppb (3) | 17.0 μg/m3 (15) | 16.4 μg/m3 (59) | 59.0 | |
| Jan. 24, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 μg/m3 (15) | 16.0 μg/m3 (59) | 59.0 | |
| Jan. 24, 2020, 7 a.m. | N/A | N/A | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.24 ppb (3) | 15.0 μg/m3 (14) | 13.7 μg/m3 (54) | 54.0 | |
| Jan. 24, 2020, 6 a.m. | N/A | N/A | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.26 ppb (3) | 14.0 μg/m3 (13) | 13.0 μg/m3 (52) | 52.0 | |
| Jan. 24, 2020, 5 a.m. | N/A | N/A | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.3 ppb (3) | 15.0 μg/m3 (14) | 13.2 μg/m3 (53) | 53.0 | |
| Jan. 24, 2020, 4 a.m. | N/A | N/A | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.29 ppb (3) | 13.0 μg/m3 (12) | 12.2 μg/m3 (50) | 50.0 | |
| Jan. 24, 2020, 3 a.m. | N/A | N/A | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.28 ppb (3) | 18.0 μg/m3 (16) | 12.2 μg/m3 (50) | 50.0 | |
| Jan. 24, 2020, 2 a.m. | N/A | N/A | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.31 ppb (3) | 13.0 μg/m3 (12) | 12.4 μg/m3 (51) | 51.0 | |
| Jan. 24, 2020, 1 a.m. | N/A | N/A | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.34 ppb (4) | 16.0 μg/m3 (15) | 15.7 μg/m3 (58) | 58.0 | |
| Jan. 24, 2020, midnight | N/A | N/A | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.33 ppb (4) | 15.0 μg/m3 (14) | 14.5 μg/m3 (55) | 55.0 | |
| Jan. 23, 2020, 11 p.m. | N/A | N/A | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.36 ppb (4) | 16.0 μg/m3 (15) | 15.2 μg/m3 (57) | 57.0 | |
| Jan. 23, 2020, 10 p.m. | N/A | N/A | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.34 ppb (4) | 16.0 μg/m3 (15) | 15.8 μg/m3 (58) | 58.0 | |
| Jan. 23, 2020, 7 p.m. | N/A | N/A | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.32 ppb (4) | 15.0 μg/m3 (14) | 14.6 μg/m3 (56) | 56.0 | |
| Jan. 23, 2020, 6 p.m. | N/A | N/A | N/A | 17.0 ppb (16) | N/A | N/A | N/A | N/A | 16.0 μg/m3 (15) | 15.3 μg/m3 (57) | 57.0 | |
| Jan. 23, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 μg/m3 (15) | 15.3 μg/m3 (57) | 57.0 | |
| Jan. 23, 2020, 2 p.m. | N/A | N/A | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.28 ppb (3) | 17.0 μg/m3 (15) | 16.0 μg/m3 (59) | 59.0 | |
| Jan. 23, 2020, 1 p.m. | N/A | N/A | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.27 ppb (3) | 17.0 μg/m3 (15) | 16.2 μg/m3 (59) | 59.0 | |
| Jan. 23, 2020, noon | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 16.4 μg/m3 (59) | 59.0 | |
| Jan. 23, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 14.9 μg/m3 (56) | 56.0 | |
| Jan. 23, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 15.3 μg/m3 (57) | 57.0 | |
| Jan. 23, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 15.2 μg/m3 (57) | 57.0 | |
| Jan. 23, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 14.5 μg/m3 (55) | 55.0 | |
| Jan. 23, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 12.8 μg/m3 (52) | 52.0 | |
| Jan. 23, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 11.7 μg/m3 (49) | 49.0 | |
| Jan. 23, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 11.2 μg/m3 (47) | 47.0 | |
| Jan. 23, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 10.9 μg/m3 (45) | 45.0 | |
| Jan. 23, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 11.1 μg/m3 (46) | 46.0 | |
| Jan. 23, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 11.4 μg/m3 (48) | 48.0 | |
| Jan. 23, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 13.2 μg/m3 (53) | 53.0 | |
| Jan. 23, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 13.8 μg/m3 (54) | 54.0 | |
| Jan. 22, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 14.9 μg/m3 (56) | 56.0 | |
| Jan. 22, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.38 ppb (4) | N/A | 15.6 μg/m3 (58) | 58.0 | |
| Jan. 22, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.36 ppb (4) | N/A | 15.1 μg/m3 (57) | 57.0 | |
| Jan. 22, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 15.3 μg/m3 (57) | 57.0 | |
| Jan. 22, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 14.9 μg/m3 (56) | 56.0 | |
| Jan. 22, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| Jan. 22, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 15.3 μg/m3 (57) | 57.0 | |
| Jan. 22, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 15.7 μg/m3 (58) | 58.0 | |
| Jan. 22, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| Jan. 22, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| Jan. 22, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| Jan. 22, 2020, noon | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 13.3 μg/m3 (53) | 53.0 | |
| Jan. 22, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 12.8 μg/m3 (52) | 52.0 | |
| Jan. 22, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 12.7 μg/m3 (51) | 51.0 | |
| Jan. 22, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 11.8 μg/m3 (49) | 49.0 | |
| Jan. 22, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 11.5 μg/m3 (48) | 48.0 | |
| Jan. 22, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 11.6 μg/m3 (48) | 48.0 | |
| Jan. 22, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 14.1 μg/m3 (54) | 54.0 | |
| Jan. 22, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| Jan. 22, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 16.0 μg/m3 (59) | 59.0 | |
| Jan. 22, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 15.9 μg/m3 (58) | 58.0 | |
| Jan. 22, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 15.3 μg/m3 (57) | 57.0 | |
| Jan. 22, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 11.9 μg/m3 (50) | 50.0 | |
| Jan. 22, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.33 ppb (4) | N/A | 10.3 μg/m3 (43) | 43.0 | |
| Jan. 21, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.33 ppb (4) | N/A | 9.6 μg/m3 (40) | 40.0 | |
| Jan. 21, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.33 ppb (4) | N/A | 9.2 μg/m3 (38) | 38.0 | |
| Jan. 21, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 10.2 μg/m3 (42) | 42.0 | |
| Jan. 21, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 10.5 μg/m3 (44) | 44.0 | |
| Jan. 21, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 9.4 μg/m3 (39) | 39.0 | |
| Jan. 21, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 11.1 μg/m3 (46) | 46.0 | |
| Jan. 21, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 21.1 μg/m3 (69) | 69.0 | |
| Jan. 21, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 23.2 μg/m3 (74) | 74.0 | |
| Jan. 21, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 16.6 μg/m3 (60) | 60.0 | |
| Jan. 21, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 16.9 μg/m3 (60) | 60.0 | |
| Jan. 21, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 17.1 μg/m3 (61) | 61.0 | |
| Jan. 21, 2020, noon | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 16.9 μg/m3 (60) | 60.0 | |
| Jan. 21, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 14.4 μg/m3 (55) | 55.0 | |
| Jan. 21, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 12.7 μg/m3 (51) | 51.0 | |
| Jan. 21, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 12.7 μg/m3 (51) | 51.0 | |
| Jan. 21, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 11.3 μg/m3 (47) | 47.0 | |
| Jan. 21, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 10.3 μg/m3 (43) | 43.0 | |
| Jan. 21, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 9.3 μg/m3 (39) | 39.0 | |
| Jan. 21, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.47 ppb (5) | N/A | 9.5 μg/m3 (40) | 40.0 | |
| Jan. 21, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 9.4 μg/m3 (39) | 39.0 | |
| Jan. 21, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.49 ppb (5) | N/A | 10.9 μg/m3 (45) | 45.0 | |
| Jan. 21, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.47 ppb (5) | N/A | 9.9 μg/m3 (41) | 41.0 | |
| Jan. 21, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 8.5 μg/m3 (35) | 35.0 | |
| Jan. 21, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 8.2 μg/m3 (34) | 34.0 | |
| Jan. 20, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 7.8 μg/m3 (32) | 32.0 | |
| Jan. 20, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 9.1 μg/m3 (38) | 38.0 | |
| Jan. 20, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 9.3 μg/m3 (39) | 39.0 | |
| Jan. 20, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 8.8 μg/m3 (37) | 37.0 | |
| Jan. 20, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.33 ppb (4) | N/A | 8.8 μg/m3 (37) | 37.0 | |
| Jan. 20, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.33 ppb (4) | N/A | 8.7 μg/m3 (36) | 36.0 | |
| Jan. 20, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 9.5 μg/m3 (40) | 40.0 | |
| Jan. 20, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.38 ppb (4) | N/A | 12.1 μg/m3 (50) | 50.0 | |
| Jan. 20, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| Jan. 20, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.53 ppb (6) | N/A | 8.1 μg/m3 (34) | 34.0 | |
| Jan. 20, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.51 ppb (6) | N/A | 8.4 μg/m3 (35) | 35.0 | |
| Jan. 20, 2020, noon | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 6.9 μg/m3 (29) | 29.0 | |
| Jan. 20, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 6.1 μg/m3 (25) | 25.0 | |
| Jan. 20, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 6.4 μg/m3 (27) | 27.0 | |
| Jan. 20, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 5.9 μg/m3 (25) | 25.0 | |
| Jan. 20, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 5.8 μg/m3 (24) | 24.0 | |
| Jan. 20, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 5.6 μg/m3 (23) | 23.0 | |
| Jan. 20, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 5.8 μg/m3 (24) | 24.0 | |
| Jan. 20, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 6.3 μg/m3 (26) | 26.0 | |
| Jan. 20, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 6.1 μg/m3 (25) | 25.0 | |
| Jan. 20, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 6.4 μg/m3 (27) | 27.0 | |
| Jan. 20, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 6.5 μg/m3 (27) | 27.0 | |
| Jan. 20, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 6.3 μg/m3 (26) | 26.0 | |
| Jan. 20, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 6.4 μg/m3 (27) | 27.0 | |
| Jan. 19, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 6.8 μg/m3 (28) | 28.0 | |
| Jan. 19, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 6.1 μg/m3 (25) | 25.0 | |
| Jan. 19, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 5.6 μg/m3 (23) | 23.0 | |
| Jan. 19, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 5.6 μg/m3 (23) | 23.0 | |
| Jan. 19, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 6.2 μg/m3 (26) | 26.0 | |
| Jan. 19, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 7.8 μg/m3 (32) | 32.0 | |
| Jan. 19, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 7.9 μg/m3 (33) | 33.0 | |
| Jan. 19, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 8.5 μg/m3 (35) | 35.0 | |
| Jan. 19, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 7.7 μg/m3 (32) | 32.0 | |
| Jan. 19, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 6.9 μg/m3 (29) | 29.0 | |
| Jan. 19, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 6.5 μg/m3 (27) | 27.0 | |
| Jan. 19, 2020, noon | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 6.6 μg/m3 (28) | 28.0 | |
| Jan. 19, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 19, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 6.9 μg/m3 (29) | 29.0 | |
| Jan. 19, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 19, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 6.9 μg/m3 (29) | 29.0 | |
| Jan. 19, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 7.8 μg/m3 (32) | 32.0 | |
| Jan. 19, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 8.2 μg/m3 (34) | 34.0 | |
| Jan. 19, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 8.7 μg/m3 (36) | 36.0 | |
| Jan. 19, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 9.3 μg/m3 (39) | 39.0 | |
| Jan. 19, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 9.6 μg/m3 (40) | 40.0 | |
| Jan. 19, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 10.6 μg/m3 (44) | 44.0 | |
| Jan. 19, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 10.4 μg/m3 (43) | 43.0 | |
| Jan. 19, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 9.9 μg/m3 (41) | 41.0 | |
| Jan. 18, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 9.6 μg/m3 (40) | 40.0 | |
| Jan. 18, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 7.1 μg/m3 (30) | 30.0 | |
| Jan. 18, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 4.8 μg/m3 (20) | 20.0 | |
| Jan. 18, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 18, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 4.3 μg/m3 (18) | 18.0 | |
| Jan. 18, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 3.9 μg/m3 (16) | 16.0 | |
| Jan. 18, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 3.8 μg/m3 (16) | 16.0 | |
| Jan. 18, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 4.8 μg/m3 (20) | 20.0 | |
| Jan. 18, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 6.9 μg/m3 (29) | 29.0 | |
| Jan. 18, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 6.5 μg/m3 (27) | 27.0 |