Steubenville OH, US: 40.366452, -80.615691
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| May 25, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 43.0 ppb (33) | N/A | N/A | 11.3 μg/m3 (47) | 47.0 | |
| May 25, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 43.0 ppb (33) | N/A | N/A | 11.6 μg/m3 (48) | 48.0 | |
| May 25, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 43.0 ppb (33) | N/A | N/A | 14.1 μg/m3 (54) | 54.0 | |
| May 25, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 44.0 ppb (34) | N/A | N/A | 14.1 μg/m3 (54) | 54.0 | |
| May 25, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (9) | 33.0 ppb (25) | N/A | N/A | 15.8 μg/m3 (58) | 58.0 | |
| May 25, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (13) | 20.0 ppb (15) | N/A | N/A | 21.4 μg/m3 (70) | 70.0 | |
| May 25, 2019, noon | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (9) | 11.0 ppb (8) | N/A | N/A | 28.0 μg/m3 (84) | 84.0 | |
| May 25, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 5.0 ppb (4) | N/A | N/A | 21.4 μg/m3 (70) | 70.0 | |
| May 25, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | N/A | N/A | N/A | 11.3 μg/m3 (47) | 47.0 | |
| May 25, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 4.0 ppb (3) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 25, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 7.0 ppb (5) | N/A | N/A | 2.8 μg/m3 (12) | 12.0 | |
| May 25, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 7.0 ppb (5) | N/A | N/A | 15.8 μg/m3 (58) | 58.0 | |
| May 25, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 8.0 ppb (6) | N/A | N/A | 13.5 μg/m3 (53) | 53.0 | |
| May 25, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 12.0 ppb (9) | N/A | N/A | 13.5 μg/m3 (53) | 53.0 | |
| May 25, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 18.0 ppb (14) | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 25, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 10.1 μg/m3 (42) | 42.0 | |
| May 25, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 21.0 ppb (16) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 25, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 31.0 ppb (24) | N/A | N/A | 10.3 μg/m3 (43) | 43.0 | |
| May 25, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 42.0 ppb (32) | N/A | N/A | 11.1 μg/m3 (46) | 46.0 | |
| May 24, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 51.0 ppb (39) | N/A | N/A | 5.7 μg/m3 (24) | 39.0 | |
| May 24, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 54.0 ppb (42) | N/A | N/A | 3.9 μg/m3 (16) | 42.0 | |
| May 24, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 58.0 ppb (45) | N/A | N/A | 6.3 μg/m3 (26) | 45.0 | |
| May 24, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 61.0 ppb (47) | N/A | N/A | 6.2 μg/m3 (26) | 47.0 | |
| May 24, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 57.0 ppb (44) | N/A | N/A | 5.7 μg/m3 (24) | 44.0 | |
| May 24, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 55.0 ppb (42) | N/A | N/A | 6.2 μg/m3 (26) | 42.0 | |
| May 24, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 51.0 ppb (39) | N/A | N/A | 5.7 μg/m3 (24) | 39.0 | |
| May 24, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 48.0 ppb (37) | N/A | N/A | 5.4 μg/m3 (23) | 37.0 | |
| May 24, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 44.0 ppb (34) | N/A | N/A | 7.0 μg/m3 (29) | 34.0 | |
| May 24, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 40.0 ppb (31) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 24, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 35.0 ppb (27) | N/A | N/A | 10.3 μg/m3 (43) | 43.0 | |
| May 24, 2019, noon | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 22.0 ppb (17) | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 24, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 10.0 ppb (8) | N/A | N/A | 9.5 μg/m3 (40) | 40.0 | |
| May 24, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 7.5 μg/m3 (31) | 31.0 | |
| May 24, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 34.0 ppb (26) | N/A | N/A | 4.9 μg/m3 (20) | 26.0 | |
| May 24, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | N/A | N/A | 3.1 μg/m3 (13) | 31.0 | |
| May 24, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 46.0 ppb (35) | N/A | N/A | 7.5 μg/m3 (31) | 35.0 | |
| May 24, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 45.0 ppb (35) | N/A | N/A | 9.5 μg/m3 (40) | 40.0 | |
| May 24, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 42.0 ppb (32) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 24, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 41.0 ppb (32) | N/A | N/A | 11.3 μg/m3 (47) | 47.0 | |
| May 24, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 12.3 μg/m3 (51) | 51.0 | |
| May 24, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 29.0 ppb (22) | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 24, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 34.0 ppb (26) | N/A | N/A | 13.8 μg/m3 (54) | 54.0 | |
| May 24, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 41.0 ppb (32) | N/A | N/A | 16.1 μg/m3 (59) | 59.0 | |
| May 23, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 44.0 ppb (34) | N/A | N/A | 11.3 μg/m3 (47) | 47.0 | |
| May 23, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 42.0 ppb (32) | N/A | N/A | 9.6 μg/m3 (40) | 40.0 | |
| May 23, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 43.0 ppb (33) | N/A | N/A | 8.6 μg/m3 (36) | 36.0 | |
| May 23, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 45.0 ppb (35) | N/A | N/A | 6.3 μg/m3 (26) | 35.0 | |
| May 23, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 46.0 ppb (35) | N/A | N/A | 5.0 μg/m3 (21) | 35.0 | |
| May 23, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 45.0 ppb (35) | N/A | N/A | 7.3 μg/m3 (30) | 35.0 | |
| May 23, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 40.0 ppb (31) | N/A | N/A | 10.1 μg/m3 (42) | 42.0 | |
| May 23, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 33.0 ppb (25) | N/A | N/A | 10.6 μg/m3 (44) | 44.0 | |
| May 23, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 29.0 ppb (22) | N/A | N/A | 11.1 μg/m3 (46) | 46.0 | |
| May 23, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 31.0 ppb (24) | N/A | N/A | 17.1 μg/m3 (61) | 61.0 | |
| May 23, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (4) | 32.0 ppb (25) | N/A | N/A | 15.4 μg/m3 (57) | 57.0 | |
| May 23, 2019, noon | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (4) | 16.0 ppb (12) | N/A | N/A | 27.5 μg/m3 (83) | 83.0 | |
| May 23, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 6.0 ppb (5) | N/A | N/A | 18.9 μg/m3 (65) | 65.0 | |
| May 23, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (6) | N/A | N/A | N/A | 17.9 μg/m3 (63) | 63.0 | |
| May 23, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (6) | 2.0 ppb (2) | N/A | N/A | 19.4 μg/m3 (66) | 66.0 | |
| May 23, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 6.0 ppb (5) | N/A | N/A | 19.2 μg/m3 (65) | 65.0 | |
| May 23, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 10.0 ppb (8) | N/A | N/A | 14.8 μg/m3 (56) | 56.0 | |
| May 23, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 12.0 ppb (9) | N/A | N/A | 16.6 μg/m3 (60) | 60.0 | |
| May 23, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 19.0 ppb (15) | N/A | N/A | 16.9 μg/m3 (60) | 60.0 | |
| May 23, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 25.0 ppb (19) | N/A | N/A | 17.6 μg/m3 (62) | 62.0 | |
| May 23, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 20.2 μg/m3 (67) | 67.0 | |
| May 23, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 26.0 ppb (20) | N/A | N/A | 18.9 μg/m3 (65) | 65.0 | |
| May 23, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 35.0 ppb (27) | N/A | N/A | 16.6 μg/m3 (60) | 60.0 | |
| May 23, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 42.0 ppb (32) | N/A | N/A | 13.6 μg/m3 (53) | 53.0 | |
| May 22, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (4) | 48.0 ppb (37) | N/A | N/A | 16.9 μg/m3 (60) | 60.0 | |
| May 22, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (4) | 54.0 ppb (42) | N/A | N/A | 12.6 μg/m3 (51) | 51.0 | |
| May 22, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (6) | 54.0 ppb (42) | N/A | N/A | 12.3 μg/m3 (51) | 51.0 | |
| May 22, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (4) | 54.0 ppb (42) | N/A | N/A | 10.8 μg/m3 (45) | 45.0 | |
| May 22, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (6) | 56.0 ppb (43) | N/A | N/A | 15.6 μg/m3 (58) | 58.0 | |
| May 22, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (7) | 53.0 ppb (41) | N/A | N/A | 15.4 μg/m3 (57) | 57.0 | |
| May 22, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 49.0 ppb (38) | N/A | N/A | 8.3 μg/m3 (35) | 38.0 | |
| May 22, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 42.0 ppb (32) | N/A | N/A | 7.3 μg/m3 (30) | 32.0 | |
| May 22, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 33.0 ppb (25) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 22, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 28.0 ppb (22) | N/A | N/A | 8.8 μg/m3 (37) | 37.0 | |
| May 22, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 22.0 ppb (17) | N/A | N/A | 8.8 μg/m3 (37) | 37.0 | |
| May 22, 2019, noon | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 14.0 ppb (11) | N/A | N/A | 10.3 μg/m3 (43) | 43.0 | |
| May 22, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 11.0 ppb (8) | N/A | N/A | 9.3 μg/m3 (39) | 39.0 | |
| May 22, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 8.3 μg/m3 (35) | 35.0 | |
| May 22, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 2.0 ppb (2) | N/A | N/A | 9.3 μg/m3 (39) | 39.0 | |
| May 22, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 3.0 ppb (2) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 22, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 6.0 ppb (5) | N/A | N/A | 9.3 μg/m3 (39) | 39.0 | |
| May 22, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 6.0 ppb (5) | N/A | N/A | 7.2 μg/m3 (30) | 30.0 | |
| May 22, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 6.0 ppb (5) | N/A | N/A | 5.7 μg/m3 (24) | 24.0 | |
| May 22, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 9.0 ppb (7) | N/A | N/A | 6.7 μg/m3 (28) | 28.0 | |
| May 22, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | 7.5 μg/m3 (31) | 31.0 | |
| May 22, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 18.0 ppb (14) | N/A | N/A | 7.2 μg/m3 (30) | 30.0 | |
| May 22, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 17.0 ppb (13) | N/A | N/A | 8.8 μg/m3 (37) | 37.0 | |
| May 22, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 24.0 ppb (18) | N/A | N/A | 3.9 μg/m3 (16) | 18.0 | |
| May 21, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 29.0 ppb (22) | N/A | N/A | 3.1 μg/m3 (13) | 22.0 | |
| May 21, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 30.0 ppb (23) | N/A | N/A | 8.3 μg/m3 (35) | 35.0 | |
| May 21, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | N/A | N/A | 7.5 μg/m3 (31) | 31.0 | |
| May 21, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 31.0 ppb (24) | N/A | N/A | 6.7 μg/m3 (28) | 28.0 | |
| May 21, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 31.0 ppb (24) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 21, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 31.0 ppb (24) | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 21, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 30.0 ppb (23) | N/A | N/A | 4.4 μg/m3 (18) | 23.0 | |
| May 21, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 29.0 ppb (22) | N/A | N/A | 4.7 μg/m3 (20) | 22.0 | |
| May 21, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 28.0 ppb (22) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 21, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 28.0 ppb (22) | N/A | N/A | 8.3 μg/m3 (35) | 35.0 | |
| May 21, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 27.0 ppb (21) | N/A | N/A | 7.5 μg/m3 (31) | 31.0 | |
| May 21, 2019, noon | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 25.0 ppb (19) | N/A | N/A | 5.9 μg/m3 (25) | 25.0 | |
| May 21, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 25.0 ppb (19) | N/A | N/A | 4.1 μg/m3 (17) | 19.0 | |
| May 21, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.1 μg/m3 (13) | 13.0 | |
| May 21, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 28.0 ppb (22) | N/A | N/A | 4.1 μg/m3 (17) | 22.0 | |
| May 21, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 26.0 ppb (20) | N/A | N/A | 5.4 μg/m3 (23) | 23.0 | |
| May 21, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 22.0 ppb (17) | N/A | N/A | 5.4 μg/m3 (23) | 23.0 | |
| May 21, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 24.0 ppb (18) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 21, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 24.0 ppb (18) | N/A | N/A | 6.5 μg/m3 (27) | 27.0 | |
| May 21, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 25.0 ppb (19) | N/A | N/A | 3.6 μg/m3 (15) | 19.0 | |
| May 21, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 5.7 μg/m3 (24) | 24.0 | |
| May 21, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 29.0 ppb (22) | N/A | N/A | 7.2 μg/m3 (30) | 30.0 | |
| May 21, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 27.0 ppb (21) | N/A | N/A | 7.2 μg/m3 (30) | 30.0 | |
| May 21, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 28.0 ppb (22) | N/A | N/A | 8.3 μg/m3 (35) | 35.0 | |
| May 20, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 20, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 36.0 ppb (28) | N/A | N/A | 4.9 μg/m3 (20) | 28.0 | |
| May 20, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 39.0 ppb (30) | N/A | N/A | 7.3 μg/m3 (30) | 30.0 | |
| May 20, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 41.0 ppb (32) | N/A | N/A | 7.8 μg/m3 (32) | 32.0 | |
| May 20, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 41.0 ppb (32) | N/A | N/A | 9.3 μg/m3 (39) | 39.0 | |
| May 20, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | N/A | N/A | 9.8 μg/m3 (41) | 41.0 | |
| May 20, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 41.0 ppb (32) | N/A | N/A | 9.1 μg/m3 (38) | 38.0 | |
| May 20, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | N/A | N/A | 9.3 μg/m3 (39) | 39.0 | |
| May 20, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 43.0 ppb (33) | N/A | N/A | 9.1 μg/m3 (38) | 38.0 | |
| May 20, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | N/A | N/A | 9.1 μg/m3 (38) | 38.0 | |
| May 20, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 8.4 μg/m3 (35) | 35.0 | |
| May 20, 2019, noon | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 41.0 ppb (32) | N/A | N/A | 6.8 μg/m3 (28) | 32.0 | |
| May 20, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 40.0 ppb (31) | N/A | N/A | 5.7 μg/m3 (24) | 31.0 | |
| May 20, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | N/A | N/A | N/A | 7.2 μg/m3 (30) | 30.0 | |
| May 20, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 31.0 ppb (24) | N/A | N/A | 10.6 μg/m3 (44) | 44.0 | |
| May 20, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 35.0 ppb (27) | N/A | N/A | 10.6 μg/m3 (44) | 44.0 | |
| May 20, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 35.0 ppb (27) | N/A | N/A | 9.3 μg/m3 (39) | 39.0 | |
| May 20, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 33.0 ppb (25) | N/A | N/A | 11.1 μg/m3 (46) | 46.0 | |
| May 20, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 34.0 ppb (26) | N/A | N/A | 12.1 μg/m3 (50) | 50.0 | |
| May 20, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 38.0 ppb (29) | N/A | N/A | 11.8 μg/m3 (49) | 49.0 | |
| May 20, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 13.6 μg/m3 (53) | 53.0 | |
| May 20, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 42.0 ppb (32) | N/A | N/A | 13.3 μg/m3 (53) | 53.0 | |
| May 20, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 43.0 ppb (33) | N/A | N/A | 12.6 μg/m3 (51) | 51.0 | |
| May 20, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 36.0 ppb (28) | N/A | N/A | 13.6 μg/m3 (53) | 53.0 | |
| May 19, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 38.0 ppb (29) | N/A | N/A | 17.4 μg/m3 (61) | 61.0 | |
| May 19, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 47.0 ppb (36) | N/A | N/A | 16.2 μg/m3 (59) | 59.0 | |
| May 19, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 50.0 ppb (38) | N/A | N/A | 13.4 μg/m3 (53) | 53.0 | |
| May 19, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 52.0 ppb (40) | N/A | N/A | 18.7 μg/m3 (64) | 64.0 | |
| May 19, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 52.0 ppb (40) | N/A | N/A | 14.4 μg/m3 (55) | 55.0 | |
| May 19, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 50.0 ppb (38) | N/A | N/A | 11.9 μg/m3 (50) | 50.0 | |
| May 19, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 49.0 ppb (38) | N/A | N/A | 12.4 μg/m3 (51) | 51.0 | |
| May 19, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 46.0 ppb (35) | N/A | N/A | 14.6 μg/m3 (56) | 56.0 | |
| May 19, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (6) | 45.0 ppb (35) | N/A | N/A | 18.7 μg/m3 (64) | 64.0 | |
| May 19, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (7) | 41.0 ppb (32) | N/A | N/A | 15.9 μg/m3 (58) | 58.0 | |
| May 19, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (9) | 30.0 ppb (23) | N/A | N/A | 21.0 μg/m3 (69) | 69.0 | |
| May 19, 2019, noon | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (10) | 9.0 ppb (7) | N/A | N/A | 21.7 μg/m3 (71) | 71.0 | |
| May 19, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (10) | 3.0 ppb (2) | N/A | N/A | 19.7 μg/m3 (66) | 66.0 | |
| May 19, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (9) | N/A | N/A | N/A | 25.0 μg/m3 (78) | 78.0 | |
| May 19, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (4) | 2.0 ppb (2) | N/A | N/A | 16.6 μg/m3 (60) | 60.0 | |
| May 19, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (4) | 0.0 ppb (0) | N/A | N/A | 14.6 μg/m3 (56) | 56.0 | |
| May 19, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (4) | 0.0 ppb (0) | N/A | N/A | 18.9 μg/m3 (65) | 65.0 | |
| May 19, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (4) | 1.0 ppb (1) | N/A | N/A | 17.1 μg/m3 (61) | 61.0 | |
| May 19, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 1.0 ppb (1) | N/A | N/A | 24.0 μg/m3 (76) | 76.0 | |
| May 19, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 1.0 ppb (1) | N/A | N/A | 30.1 μg/m3 (89) | 89.0 | |
| May 19, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | N/A | N/A | 34.6 μg/m3 (98) | 98.0 | |
| May 19, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 8.0 ppb (6) | N/A | N/A | 27.3 μg/m3 (83) | 83.0 | |
| May 19, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 15.0 ppb (12) | N/A | N/A | 23.4 μg/m3 (74) | 74.0 | |
| May 19, 2019, midnight | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 27.0 ppb (21) | N/A | N/A | 23.7 μg/m3 (75) | 75.0 | |
| May 18, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 47.0 ppb (36) | N/A | N/A | 5.5 μg/m3 (23) | 36.0 | |
| May 18, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (6) | 54.0 ppb (42) | N/A | N/A | 17.4 μg/m3 (61) | 61.0 | |
| May 18, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 57.0 ppb (44) | N/A | N/A | 14.1 μg/m3 (54) | 54.0 | |
| May 18, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 56.0 ppb (43) | N/A | N/A | 13.1 μg/m3 (52) | 52.0 | |
| May 18, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (3) | 56.0 ppb (43) | N/A | N/A | 13.8 μg/m3 (54) | 54.0 |