El Cajon (S 1st St) CA, US: 32.789561, -116.944222
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. 24, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 19.2 μg/m3 (65) | 65.0 | |
| Jan. 24, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 21.0 μg/m3 (69) | 69.0 | |
| Jan. 24, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 21.9 μg/m3 (71) | 71.0 | |
| Jan. 24, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 17.6 μg/m3 (62) | 62.0 | |
| Jan. 24, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | N/A | 8.7 μg/m3 (36) | 36.0 | |
| Jan. 24, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 10.6 μg/m3 (44) | 44.0 | |
| Jan. 24, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 4.4 μg/m3 (18) | 28.0 | |
| Jan. 23, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 3.8 μg/m3 (16) | 30.0 | |
| Jan. 23, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 5.4 μg/m3 (23) | 29.0 | |
| Jan. 23, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 6.0 μg/m3 (25) | 30.0 | |
| Jan. 23, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 3.2 μg/m3 (13) | 32.0 | |
| Jan. 23, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 4.6 μg/m3 (19) | 28.0 | |
| Jan. 23, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 5.5 μg/m3 (23) | 23.0 | |
| Jan. 23, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 18.3 μg/m3 (63) | 63.0 | |
| Jan. 23, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 19.8 μg/m3 (67) | 67.0 | |
| Jan. 23, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 13.5 μg/m3 (53) | 53.0 | |
| Jan. 23, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 13.7 μg/m3 (54) | 54.0 | |
| Jan. 23, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 17.9 μg/m3 (63) | 63.0 | |
| Jan. 23, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 8.2 μg/m3 (34) | 34.0 | |
| Jan. 23, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 16.9 μg/m3 (60) | 60.0 | |
| Jan. 23, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 14.2 μg/m3 (55) | 55.0 | |
| Jan. 23, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 7.1 μg/m3 (30) | 30.0 | |
| Jan. 23, 2019, 8 a.m. | 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 | |
| Jan. 23, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 17.9 μg/m3 (63) | 63.0 | |
| Jan. 23, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 18.6 μg/m3 (64) | 64.0 | |
| Jan. 23, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 13.8 μg/m3 (54) | 54.0 | |
| Jan. 23, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | N/A | 12.3 μg/m3 (51) | 51.0 | |
| Jan. 23, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 16.3 μg/m3 (59) | 59.0 | |
| Jan. 23, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | N/A | 17.7 μg/m3 (62) | 62.0 | |
| Jan. 23, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 8.2 μg/m3 (34) | 34.0 | |
| Jan. 23, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 4.8 μg/m3 (20) | 28.0 | |
| Jan. 22, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 2.9 μg/m3 (12) | 30.0 | |
| Jan. 22, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | N/A | 29.0 | |
| Jan. 22, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | N/A | 25.0 | |
| Jan. 22, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 0.7 μg/m3 (3) | 32.0 | |
| Jan. 22, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 2.0 μg/m3 (8) | 30.0 | |
| Jan. 22, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 5.2 μg/m3 (22) | 25.0 | |
| Jan. 22, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 9.2 μg/m3 (38) | 38.0 | |
| Jan. 22, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | N/A | 9.1 μg/m3 (38) | 38.0 | |
| Jan. 22, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 7.3 μg/m3 (30) | 30.0 | |
| Jan. 22, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 6.5 μg/m3 (27) | 27.0 | |
| Jan. 22, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 6.4 μg/m3 (27) | 27.0 | |
| Jan. 22, 2019, noon | 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. 22, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 7.7 μg/m3 (32) | 32.0 | |
| Jan. 22, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 22, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| Jan. 22, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 13.6 μg/m3 (53) | 53.0 | |
| Jan. 22, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 13.1 μg/m3 (52) | 52.0 | |
| Jan. 22, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 17.5 μg/m3 (62) | 62.0 | |
| Jan. 22, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | 17.7 μg/m3 (62) | 62.0 | |
| Jan. 22, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 23.2 μg/m3 (74) | 74.0 | |
| Jan. 22, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 15.1 μg/m3 (57) | 57.0 | |
| Jan. 22, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 6.6 μg/m3 (28) | 28.0 | |
| Jan. 22, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | N/A | 4.5 μg/m3 (19) | 32.0 | |
| Jan. 22, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | 6.8 μg/m3 (28) | 35.0 | |
| Jan. 21, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | 3.7 μg/m3 (15) | 36.0 | |
| Jan. 21, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | N/A | 4.3 μg/m3 (18) | 36.0 | |
| Jan. 21, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 46.0 ppb (35) | N/A | N/A | 3.2 μg/m3 (13) | 35.0 | |
| Jan. 21, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | N/A | 4.6 μg/m3 (19) | 35.0 | |
| Jan. 21, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 44.0 ppb (34) | N/A | N/A | 5.5 μg/m3 (23) | 34.0 | |
| Jan. 21, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | N/A | 4.1 μg/m3 (17) | 33.0 | |
| Jan. 21, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 4.6 μg/m3 (19) | 30.0 | |
| Jan. 21, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 6.5 μg/m3 (27) | 28.0 | |
| Jan. 21, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 7.0 μg/m3 (29) | 30.0 | |
| Jan. 21, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 5.3 μg/m3 (22) | 24.0 | |
| Jan. 21, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 4.1 μg/m3 (17) | 25.0 | |
| Jan. 21, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 8.7 μg/m3 (36) | 36.0 | |
| Jan. 21, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 14.6 μg/m3 (56) | 56.0 | |
| Jan. 21, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 μg/m3 (61) | 61.0 | |
| Jan. 21, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 26.4 μg/m3 (81) | 81.0 | |
| Jan. 21, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 22.0 μg/m3 (71) | 71.0 | |
| Jan. 21, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 24.5 μg/m3 (77) | 77.0 | |
| Jan. 21, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 27.8 μg/m3 (84) | 84.0 | |
| Jan. 21, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 27.1 μg/m3 (82) | 82.0 | |
| Jan. 21, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 35.6 μg/m3 (100) | 100.0 | |
| Jan. 21, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 24.7 μg/m3 (77) | 77.0 | |
| Jan. 21, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 22.1 μg/m3 (71) | 71.0 | |
| Jan. 21, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 29.1 μg/m3 (86) | 86.0 | |
| Jan. 21, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 10.8 μg/m3 (45) | 45.0 | |
| Jan. 20, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 6.1 μg/m3 (25) | 25.0 | |
| Jan. 20, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 8.2 μg/m3 (34) | 34.0 | |
| Jan. 20, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 4.6 μg/m3 (19) | 30.0 | |
| Jan. 20, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 4.0 μg/m3 (17) | 26.0 | |
| Jan. 20, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 6.5 μg/m3 (27) | 27.0 | |
| Jan. 20, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 8.8 μg/m3 (37) | 37.0 | |
| Jan. 20, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | N/A | 15.8 μg/m3 (58) | 58.0 | |
| Jan. 20, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| Jan. 20, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 14.0 μg/m3 (54) | 54.0 | |
| Jan. 20, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 11.2 μg/m3 (47) | 47.0 | |
| Jan. 20, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 12.4 μg/m3 (51) | 51.0 | |
| Jan. 20, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 13.9 μg/m3 (54) | 54.0 | |
| Jan. 20, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 μg/m3 (56) | 56.0 | |
| Jan. 20, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 20.7 μg/m3 (69) | 69.0 | |
| Jan. 20, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 21.4 μg/m3 (70) | 70.0 | |
| Jan. 20, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 19.2 μg/m3 (65) | 65.0 | |
| Jan. 20, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 21.1 μg/m3 (69) | 69.0 | |
| Jan. 20, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 19.5 μg/m3 (66) | 66.0 | |
| Jan. 20, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 21.0 μg/m3 (69) | 69.0 | |
| Jan. 20, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 12.3 μg/m3 (51) | 51.0 | |
| Jan. 20, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 16.6 μg/m3 (60) | 60.0 | |
| Jan. 20, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | N/A | 15.1 μg/m3 (57) | 57.0 | |
| Jan. 20, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 9.8 μg/m3 (41) | 41.0 | |
| Jan. 20, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 7.4 μg/m3 (31) | 31.0 | |
| Jan. 19, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 8.9 μg/m3 (37) | 37.0 | |
| Jan. 19, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 9.1 μg/m3 (38) | 38.0 | |
| Jan. 19, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | N/A | 6.2 μg/m3 (26) | 32.0 | |
| Jan. 19, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 4.1 μg/m3 (17) | 29.0 | |
| Jan. 19, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 5.4 μg/m3 (23) | 23.0 | |
| Jan. 19, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 9.1 μg/m3 (38) | 38.0 | |
| Jan. 19, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 7.1 μg/m3 (30) | 30.0 | |
| Jan. 19, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 9.4 μg/m3 (39) | 39.0 | |
| Jan. 19, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 10.4 μg/m3 (43) | 43.0 | |
| Jan. 19, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 7.7 μg/m3 (32) | 32.0 | |
| Jan. 19, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 9.5 μg/m3 (40) | 40.0 | |
| Jan. 19, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 12.1 μg/m3 (50) | 50.0 | |
| Jan. 19, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 7.3 μg/m3 (30) | 30.0 | |
| Jan. 19, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 19, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 14.2 μg/m3 (55) | 55.0 | |
| Jan. 19, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 10.5 μg/m3 (44) | 44.0 | |
| Jan. 19, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 7.8 μg/m3 (32) | 32.0 | |
| Jan. 19, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | N/A | 8.4 μg/m3 (35) | 35.0 | |
| Jan. 19, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 8.4 μg/m3 (35) | 35.0 | |
| Jan. 19, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 22.7 μg/m3 (73) | 73.0 | |
| Jan. 19, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 7.8 μg/m3 (32) | 32.0 | |
| Jan. 19, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 7.1 μg/m3 (30) | 30.0 | |
| Jan. 19, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 6.7 μg/m3 (28) | 28.0 | |
| Jan. 19, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 6.3 μg/m3 (26) | 27.0 | |
| Jan. 18, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 8.9 μg/m3 (37) | 37.0 | |
| Jan. 18, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | 8.3 μg/m3 (35) | 35.0 | |
| Jan. 18, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 6.5 μg/m3 (27) | 28.0 | |
| Jan. 18, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 5.1 μg/m3 (21) | 30.0 | |
| Jan. 18, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 5.0 μg/m3 (21) | 30.0 | |
| Jan. 18, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 8.4 μg/m3 (35) | 35.0 | |
| Jan. 18, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 11.7 μg/m3 (49) | 49.0 | |
| Jan. 18, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 5.3 μg/m3 (22) | 22.0 | |
| Jan. 18, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 3.1 μg/m3 (13) | 13.0 | |
| Jan. 18, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 4.5 μg/m3 (19) | 19.0 | |
| Jan. 18, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | N/A | 4.1 μg/m3 (17) | 17.0 | |
| Jan. 18, 2019, noon | 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 | |
| Jan. 18, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 4.7 μg/m3 (20) | 20.0 | |
| Jan. 18, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 5.7 μg/m3 (24) | 24.0 | |
| Jan. 18, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 3.5 μg/m3 (15) | 15.0 | |
| Jan. 18, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 18, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 3.0 μg/m3 (12) | 22.0 | |
| Jan. 18, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 2.4 μg/m3 (10) | 18.0 | |
| Jan. 18, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 2.0 μg/m3 (8) | 18.0 | |
| Jan. 18, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 0.5 μg/m3 (2) | 20.0 | |
| Jan. 18, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 3.0 μg/m3 (12) | 18.0 | |
| Jan. 18, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 2.8 μg/m3 (12) | 18.0 | |
| Jan. 18, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | -1.5 μg/m3 (0) | 20.0 | |
| Jan. 18, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 0.5 μg/m3 (2) | 22.0 | |
| Jan. 17, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | -1.1 μg/m3 (0) | 23.0 | |
| Jan. 17, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | -1.1 μg/m3 (0) | 23.0 | |
| Jan. 17, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 2.9 μg/m3 (12) | 23.0 | |
| Jan. 17, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 4.4 μg/m3 (18) | 21.0 | |
| Jan. 17, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 3.5 μg/m3 (15) | 20.0 | |
| Jan. 17, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 5.6 μg/m3 (23) | 23.0 | |
| Jan. 17, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 17, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 5.4 μg/m3 (23) | 23.0 | |
| Jan. 17, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 2.3 μg/m3 (10) | 10.0 | |
| Jan. 17, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 5.2 μg/m3 (22) | 22.0 | |
| Jan. 17, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 4.7 μg/m3 (20) | 20.0 | |
| Jan. 17, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 5.2 μg/m3 (22) | 22.0 | |
| Jan. 17, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 7.7 μg/m3 (32) | 32.0 | |
| Jan. 17, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 5.7 μg/m3 (24) | 24.0 | |
| Jan. 17, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 7.8 μg/m3 (32) | 32.0 | |
| Jan. 17, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 6.2 μg/m3 (26) | 26.0 | |
| Jan. 16, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 3.4 μg/m3 (14) | 30.0 |