Springdale AR, US: 36.1797, -94.1167
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sept. 11, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Sept. 11, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 6.9 μg/m3 (29) | 29.0 | |
| Sept. 11, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 9.6 μg/m3 (40) | 40.0 | |
| Sept. 11, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 10.7 μg/m3 (45) | 45.0 | |
| Sept. 11, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 9.5 μg/m3 (40) | 40.0 | |
| Sept. 10, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 7.9 μg/m3 (33) | 33.0 | |
| Sept. 10, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 44.0 ppb (34) | N/A | N/A | 7.0 μg/m3 (29) | 34.0 | |
| Sept. 10, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | 4.3 μg/m3 (18) | 35.0 | |
| Sept. 10, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | 6.7 μg/m3 (28) | 36.0 | |
| Sept. 10, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | N/A | 3.9 μg/m3 (16) | 38.0 | |
| Sept. 10, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 50.0 ppb (38) | N/A | N/A | 4.5 μg/m3 (19) | 38.0 | |
| Sept. 10, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | N/A | 9.3 μg/m3 (39) | 39.0 | |
| Sept. 10, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | N/A | 8.2 μg/m3 (34) | 37.0 | |
| Sept. 10, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | 9.7 μg/m3 (40) | 40.0 | |
| Sept. 10, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | 8.8 μg/m3 (37) | 37.0 | |
| Sept. 10, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 10.8 μg/m3 (45) | 45.0 | |
| Sept. 10, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 8.8 μg/m3 (37) | 37.0 | |
| Sept. 10, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 7.1 μg/m3 (30) | 30.0 | |
| Sept. 10, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 6.4 μg/m3 (27) | 28.0 | |
| Sept. 10, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 5.7 μg/m3 (24) | 30.0 | |
| Sept. 10, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 5.6 μg/m3 (23) | 30.0 | |
| Sept. 10, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 9.6 μg/m3 (40) | 40.0 | |
| Sept. 10, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 9.2 μg/m3 (38) | 38.0 | |
| Sept. 10, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Sept. 10, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 9.4 μg/m3 (39) | 39.0 | |
| Sept. 10, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 8.1 μg/m3 (34) | 34.0 | |
| Sept. 10, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 10.6 μg/m3 (44) | 44.0 | |
| Sept. 10, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 9.5 μg/m3 (40) | 40.0 | |
| Sept. 10, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 10.9 μg/m3 (45) | 45.0 | |
| Sept. 9, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 10.4 μg/m3 (43) | 43.0 | |
| Sept. 9, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 44.0 ppb (34) | N/A | N/A | 10.2 μg/m3 (42) | 42.0 | |
| Sept. 9, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 46.0 ppb (35) | N/A | N/A | 8.7 μg/m3 (36) | 36.0 | |
| Sept. 9, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | 11.2 μg/m3 (47) | 47.0 | |
| Sept. 9, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 46.0 ppb (35) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Sept. 9, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | N/A | 7.2 μg/m3 (30) | 37.0 | |
| Sept. 9, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | 5.8 μg/m3 (24) | 35.0 | |
| Sept. 9, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | N/A | 6.6 μg/m3 (28) | 32.0 | |
| Sept. 9, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| Sept. 9, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 14.6 μg/m3 (56) | 56.0 | |
| Sept. 9, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 16.3 μg/m3 (59) | 59.0 | |
| Sept. 9, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 16.2 μg/m3 (59) | 59.0 | |
| Sept. 9, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 13.9 μg/m3 (54) | 54.0 | |
| Sept. 9, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 12.4 μg/m3 (51) | 51.0 | |
| Sept. 9, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 13.5 μg/m3 (53) | 53.0 | |
| Sept. 9, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 12.8 μg/m3 (52) | 52.0 | |
| Sept. 9, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 12.3 μg/m3 (51) | 51.0 | |
| Sept. 9, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | N/A | 14.4 μg/m3 (55) | 55.0 | |
| Sept. 9, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | 13.1 μg/m3 (52) | 52.0 | |
| Sept. 9, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 9.9 μg/m3 (41) | 41.0 | |
| Sept. 9, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 9.6 μg/m3 (40) | 40.0 | |
| Sept. 9, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 13.1 μg/m3 (52) | 52.0 | |
| Sept. 9, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 13.8 μg/m3 (54) | 54.0 | |
| Sept. 9, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 13.2 μg/m3 (53) | 53.0 | |
| Sept. 8, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Sept. 8, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 4.3 μg/m3 (18) | 32.0 | |
| Sept. 8, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 9.3 μg/m3 (39) | 39.0 | |
| Sept. 8, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 44.0 ppb (34) | N/A | N/A | 5.3 μg/m3 (22) | 34.0 | |
| Sept. 8, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | 7.3 μg/m3 (30) | 35.0 | |
| Sept. 8, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 44.0 ppb (34) | N/A | N/A | 9.8 μg/m3 (41) | 41.0 | |
| Sept. 8, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 44.0 ppb (34) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Sept. 8, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | N/A | 13.9 μg/m3 (54) | 54.0 | |
| Sept. 8, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 18.4 μg/m3 (64) | 64.0 | |
| Sept. 8, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | N/A | 20.0 μg/m3 (67) | 67.0 | |
| Sept. 8, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 20.3 μg/m3 (68) | 68.0 | |
| Sept. 8, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 18.0 μg/m3 (63) | 63.0 | |
| Sept. 8, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 17.7 μg/m3 (62) | 62.0 | |
| Sept. 8, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 19.4 μg/m3 (66) | 66.0 | |
| Sept. 8, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 20.2 μg/m3 (67) | 67.0 | |
| Sept. 8, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 19.3 μg/m3 (66) | 66.0 | |
| Sept. 8, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 18.6 μg/m3 (64) | 64.0 | |
| Sept. 8, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 20.1 μg/m3 (67) | 67.0 | |
| Sept. 8, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 22.0 μg/m3 (71) | 71.0 | |
| Sept. 8, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 24.0 μg/m3 (76) | 76.0 | |
| Sept. 8, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 30.1 μg/m3 (89) | 89.0 | |
| Sept. 8, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 34.1 μg/m3 (97) | 97.0 | |
| Sept. 8, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 38.6 μg/m3 (108) | 108.0 | |
| Sept. 8, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | N/A | 43.9 μg/m3 (121) | 121.0 | |
| Sept. 7, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | N/A | 44.2 μg/m3 (122) | 122.0 | |
| Sept. 7, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | 45.5 μg/m3 (125) | 125.0 | |
| Sept. 7, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | N/A | 34.1 μg/m3 (97) | 97.0 | |
| Sept. 7, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | N/A | 31.7 μg/m3 (92) | 92.0 | |
| Sept. 7, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 56.0 ppb (43) | N/A | N/A | 33.1 μg/m3 (95) | 95.0 | |
| Sept. 7, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 56.0 ppb (43) | N/A | N/A | 36.4 μg/m3 (102) | 102.0 | |
| Sept. 7, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | N/A | 30.2 μg/m3 (89) | 89.0 | |
| Sept. 7, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | N/A | 30.4 μg/m3 (89) | 89.0 | |
| Sept. 7, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | N/A | 38.2 μg/m3 (107) | 107.0 | |
| Sept. 7, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 40.3 μg/m3 (112) | 112.0 | |
| Sept. 7, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 33.0 μg/m3 (95) | 95.0 | |
| Sept. 7, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | 29.9 μg/m3 (88) | 88.0 | |
| Sept. 7, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | N/A | 27.7 μg/m3 (83) | 83.0 | |
| Sept. 7, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | N/A | 28.9 μg/m3 (86) | 86.0 | |
| Sept. 7, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 29.2 μg/m3 (87) | 87.0 | |
| Sept. 7, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | 28.9 μg/m3 (86) | 86.0 | |
| Sept. 7, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 39.3 μg/m3 (110) | 110.0 | |
| Sept. 7, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 32.7 μg/m3 (94) | 94.0 | |
| Sept. 7, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | N/A | 36.8 μg/m3 (103) | 103.0 | |
| Sept. 7, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | N/A | 36.2 μg/m3 (102) | 102.0 | |
| Sept. 7, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 39.2 μg/m3 (109) | 109.0 | |
| Sept. 7, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 31.6 μg/m3 (92) | 92.0 | |
| Sept. 7, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | 28.3 μg/m3 (85) | 85.0 | |
| Sept. 7, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | N/A | 26.6 μg/m3 (81) | 81.0 | |
| Sept. 6, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | 22.7 μg/m3 (73) | 73.0 | |
| Sept. 6, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 56.0 ppb (43) | N/A | N/A | 20.2 μg/m3 (67) | 67.0 | |
| Sept. 6, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 57.0 ppb (44) | N/A | N/A | 17.8 μg/m3 (62) | 62.0 | |
| Sept. 6, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 57.0 ppb (44) | N/A | N/A | 19.6 μg/m3 (66) | 66.0 | |
| Sept. 6, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 59.0 ppb (45) | N/A | N/A | 16.0 μg/m3 (59) | 59.0 | |
| Sept. 6, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 62.0 ppb (48) | N/A | N/A | 15.5 μg/m3 (57) | 57.0 | |
| Sept. 6, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 60.0 ppb (46) | N/A | N/A | 14.3 μg/m3 (55) | 55.0 | |
| Sept. 6, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | 15.7 μg/m3 (58) | 58.0 | |
| Sept. 6, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | 20.9 μg/m3 (69) | 69.0 | |
| Sept. 6, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 24.5 μg/m3 (77) | 77.0 | |
| Sept. 6, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | 25.6 μg/m3 (79) | 79.0 | |
| Sept. 6, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 24.7 μg/m3 (77) | 77.0 | |
| Sept. 6, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 18.2 μg/m3 (63) | 63.0 | |
| Sept. 6, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 16.4 μg/m3 (59) | 59.0 | |
| Sept. 6, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 14.8 μg/m3 (56) | 56.0 | |
| Sept. 6, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 15.4 μg/m3 (57) | 57.0 | |
| Sept. 6, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | N/A | 14.1 μg/m3 (54) | 54.0 | |
| Sept. 6, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 17.4 μg/m3 (61) | 61.0 | |
| Sept. 6, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | N/A | 17.3 μg/m3 (61) | 61.0 | |
| Sept. 6, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 20.9 μg/m3 (69) | 69.0 | |
| Sept. 6, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 23.3 μg/m3 (74) | 74.0 | |
| Sept. 6, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | N/A | 23.9 μg/m3 (75) | 75.0 | |
| Sept. 6, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 21.3 μg/m3 (70) | 70.0 | |
| Sept. 6, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 15.3 μg/m3 (57) | 57.0 | |
| Sept. 5, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | N/A | 13.5 μg/m3 (53) | 53.0 | |
| Sept. 5, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 44.0 ppb (34) | N/A | N/A | 11.6 μg/m3 (48) | 48.0 | |
| Sept. 5, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | 11.1 μg/m3 (46) | 46.0 | |
| Sept. 5, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | 11.8 μg/m3 (49) | 49.0 | |
| Sept. 5, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | N/A | 11.8 μg/m3 (49) | 49.0 | |
| Sept. 5, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | N/A | 11.6 μg/m3 (48) | 48.0 | |
| Sept. 5, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 50.0 ppb (38) | N/A | N/A | 10.4 μg/m3 (43) | 43.0 | |
| Sept. 5, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | N/A | 10.7 μg/m3 (45) | 45.0 | |
| Sept. 5, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 21.9 μg/m3 (71) | 71.0 | |
| Sept. 5, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 22.7 μg/m3 (73) | 73.0 | |
| Sept. 5, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | N/A | 17.7 μg/m3 (62) | 62.0 | |
| Sept. 5, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 15.9 μg/m3 (58) | 58.0 | |
| Sept. 5, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 13.9 μg/m3 (54) | 54.0 | |
| Sept. 5, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 11.5 μg/m3 (48) | 48.0 | |
| Sept. 5, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | N/A | 11.6 μg/m3 (48) | 48.0 | |
| Sept. 5, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | N/A | 12.2 μg/m3 (50) | 50.0 | |
| Sept. 5, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 10.2 μg/m3 (42) | 42.0 | |
| Sept. 5, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | N/A | 13.4 μg/m3 (53) | 53.0 | |
| Sept. 5, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | N/A | 14.3 μg/m3 (55) | 55.0 | |
| Sept. 5, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 17.3 μg/m3 (61) | 61.0 | |
| Sept. 5, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 20.4 μg/m3 (68) | 68.0 | |
| Sept. 5, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 17.0 μg/m3 (61) | 61.0 | |
| Sept. 5, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 21.9 μg/m3 (71) | 71.0 | |
| Sept. 5, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 20.8 μg/m3 (69) | 69.0 | |
| Sept. 4, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | 17.4 μg/m3 (61) | 61.0 | |
| Sept. 4, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | N/A | 14.9 μg/m3 (56) | 56.0 | |
| Sept. 4, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | N/A | 13.4 μg/m3 (53) | 53.0 | |
| Sept. 4, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 62.0 ppb (48) | N/A | N/A | 12.7 μg/m3 (51) | 51.0 | |
| Sept. 4, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 61.0 ppb (47) | N/A | N/A | 11.9 μg/m3 (50) | 50.0 | |
| Sept. 4, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 59.0 ppb (45) | N/A | N/A | 10.3 μg/m3 (43) | 45.0 | |
| Sept. 4, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 56.0 ppb (43) | N/A | N/A | 10.6 μg/m3 (44) | 44.0 | |
| Sept. 4, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | N/A | 1.6 μg/m3 (7) | 42.0 | |
| Sept. 4, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 3.3 μg/m3 (14) | 29.0 | |
| Sept. 4, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 13.3 μg/m3 (53) | 53.0 | |
| Sept. 4, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | N/A | 13.3 μg/m3 (53) | 53.0 | |
| Sept. 4, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 18.4 μg/m3 (64) | 64.0 | |
| Sept. 4, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 12.1 μg/m3 (50) | 50.0 | |
| Sept. 4, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Sept. 4, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 11.5 μg/m3 (48) | 48.0 | |
| Sept. 4, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 10.5 μg/m3 (44) | 44.0 | |
| Sept. 4, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 12.1 μg/m3 (50) | 50.0 | |
| Sept. 4, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 15.1 μg/m3 (57) | 57.0 | |
| Sept. 4, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | N/A | 16.2 μg/m3 (59) | 59.0 |