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| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. 19, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | 4.0 μg/m3 (17) | 31.0 | |
| Jan. 19, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 4.0 μg/m3 (17) | 30.0 | |
| Jan. 19, 2019, 2 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. 19, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 19, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 17.0 μg/m3 (61) | 61.0 | |
| Jan. 19, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 15.0 μg/m3 (56) | 56.0 | |
| Jan. 19, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 18.0 μg/m3 (63) | 63.0 | |
| Jan. 19, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| Jan. 19, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 15.0 μg/m3 (56) | 56.0 | |
| Jan. 19, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 19, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| Jan. 19, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| Jan. 19, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Jan. 19, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 19, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 19, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 19, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 18, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 18, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 18, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 18, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 18, 2019, 7 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. 18, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 18, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 18, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | N/A | 14.0 μg/m3 (54) | 54.0 | |
| Jan. 18, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| Jan. 18, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 56.0 μg/m3 (150) | 150.0 | |
| Jan. 18, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 84.0 μg/m3 (165) | 165.0 | |
| Jan. 18, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 88.0 μg/m3 (167) | 167.0 | |
| Jan. 18, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 80.0 μg/m3 (163) | 163.0 | |
| Jan. 18, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 89.0 μg/m3 (168) | 168.0 | |
| Jan. 18, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 72.0 μg/m3 (159) | 159.0 | |
| Jan. 18, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 66.0 μg/m3 (156) | 156.0 | |
| Jan. 18, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | N/A | 59.0 μg/m3 (152) | 152.0 | |
| Jan. 18, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 56.0 μg/m3 (150) | 150.0 | |
| Jan. 18, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 59.0 μg/m3 (152) | 152.0 | |
| Jan. 18, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 55.0 μg/m3 (149) | 149.0 | |
| Jan. 18, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 59.0 μg/m3 (152) | 152.0 | |
| Jan. 18, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 77.0 μg/m3 (161) | 161.0 | |
| Jan. 18, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 73.0 μg/m3 (159) | 159.0 | |
| Jan. 18, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 57.0 μg/m3 (151) | 151.0 | |
| Jan. 17, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 56.0 μg/m3 (150) | 150.0 | |
| Jan. 17, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 58.0 μg/m3 (151) | 151.0 | |
| Jan. 17, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 69.0 μg/m3 (157) | 157.0 | |
| Jan. 17, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 75.0 μg/m3 (160) | 160.0 | |
| Jan. 17, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 70.0 μg/m3 (158) | 158.0 | |
| Jan. 17, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 71.0 μg/m3 (158) | 158.0 | |
| Jan. 17, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 58.0 μg/m3 (151) | 151.0 | |
| Jan. 17, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 117.0 μg/m3 (182) | 182.0 | |
| Jan. 17, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 109.0 μg/m3 (178) | 178.0 | |
| Jan. 17, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 107.0 μg/m3 (177) | 177.0 | |
| Jan. 17, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 103.0 μg/m3 (175) | 175.0 | |
| Jan. 17, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 85.0 μg/m3 (166) | 166.0 | |
| Jan. 17, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 77.0 μg/m3 (161) | 161.0 | |
| Jan. 17, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 53.0 μg/m3 (144) | 144.0 | |
| Jan. 17, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 38.0 μg/m3 (106) | 106.0 | |
| Jan. 17, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 30.0 μg/m3 (88) | 88.0 | |
| Jan. 17, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 21.0 μg/m3 (69) | 69.0 | |
| Jan. 17, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 24.0 μg/m3 (76) | 76.0 | |
| Jan. 17, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 22.0 μg/m3 (71) | 71.0 | |
| Jan. 17, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 17.0 μg/m3 (61) | 61.0 | |
| Jan. 17, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 18.0 μg/m3 (63) | 63.0 | |
| Jan. 17, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | 23.0 μg/m3 (73) | 73.0 | |
| Jan. 17, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | N/A | 24.0 μg/m3 (76) | 76.0 | |
| Jan. 17, 2019, midnight | 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. 16, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 19.0 μg/m3 (65) | 65.0 | |
| Jan. 16, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 22.0 μg/m3 (71) | 71.0 | |
| Jan. 16, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 27.0 μg/m3 (82) | 82.0 | |
| Jan. 16, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 26.0 μg/m3 (80) | 80.0 | |
| Jan. 16, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 32.0 μg/m3 (93) | 93.0 | |
| Jan. 16, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 38.0 μg/m3 (106) | 106.0 | |
| Jan. 16, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 64.0 μg/m3 (154) | 154.0 | |
| Jan. 16, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 84.0 μg/m3 (165) | 165.0 | |
| Jan. 16, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 77.0 μg/m3 (161) | 161.0 | |
| Jan. 16, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 73.0 μg/m3 (159) | 159.0 | |
| Jan. 16, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 71.0 μg/m3 (158) | 158.0 | |
| Jan. 16, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 57.0 μg/m3 (151) | 151.0 | |
| Jan. 16, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 50.0 μg/m3 (136) | 136.0 | |
| Jan. 16, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | N/A | 53.0 μg/m3 (144) | 144.0 | |
| Jan. 16, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 28.0 μg/m3 (84) | 84.0 | |
| Jan. 16, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 30.0 μg/m3 (88) | 88.0 | |
| Jan. 16, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 27.0 μg/m3 (82) | 82.0 | |
| Jan. 16, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 27.0 μg/m3 (82) | 82.0 | |
| Jan. 16, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 27.0 μg/m3 (82) | 82.0 | |
| Jan. 16, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 23.0 μg/m3 (73) | 73.0 | |
| Jan. 16, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | N/A | 30.0 μg/m3 (88) | 88.0 | |
| Jan. 16, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | 29.0 μg/m3 (86) | 86.0 | |
| Jan. 16, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | N/A | 35.0 μg/m3 (99) | 99.0 | |
| Jan. 16, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 37.0 μg/m3 (104) | 104.0 | |
| Jan. 15, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 43.0 μg/m3 (119) | 119.0 | |
| Jan. 15, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 46.0 μg/m3 (126) | 126.0 | |
| Jan. 15, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 44.0 μg/m3 (121) | 121.0 | |
| Jan. 15, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 48.0 μg/m3 (131) | 131.0 | |
| Jan. 15, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 45.0 μg/m3 (124) | 124.0 | |
| Jan. 15, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 41.0 μg/m3 (114) | 114.0 | |
| Jan. 15, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 38.0 μg/m3 (106) | 106.0 | |
| Jan. 15, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 27.0 μg/m3 (82) | 82.0 | |
| Jan. 15, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 22.0 μg/m3 (71) | 71.0 | |
| Jan. 15, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 22.0 μg/m3 (71) | 71.0 | |
| Jan. 15, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 17.0 μg/m3 (61) | 61.0 | |
| Jan. 15, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 15, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| Jan. 15, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| Jan. 15, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 15, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 15, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 6.0 μg/m3 (25) | 27.0 | |
| Jan. 15, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 2.0 μg/m3 (8) | 27.0 | |
| Jan. 15, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 5.0 μg/m3 (21) | 28.0 | |
| Jan. 15, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 15, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 15, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 15, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 5.0 μg/m3 (21) | 25.0 | |
| Jan. 15, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 14, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 6.0 μg/m3 (25) | 27.0 | |
| Jan. 14, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 5.0 μg/m3 (21) | 28.0 | |
| Jan. 14, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 5.0 μg/m3 (21) | 28.0 | |
| Jan. 14, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 14, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| Jan. 14, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 14, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 4.0 μg/m3 (17) | 29.0 | |
| Jan. 14, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 19.0 μg/m3 (65) | 65.0 | |
| Jan. 14, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 16.0 μg/m3 (59) | 59.0 | |
| Jan. 14, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 14.0 μg/m3 (54) | 54.0 | |
| Jan. 14, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| Jan. 14, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 15.0 μg/m3 (56) | 56.0 | |
| Jan. 14, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 16.0 μg/m3 (59) | 59.0 | |
| Jan. 14, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 16.0 μg/m3 (59) | 59.0 | |
| Jan. 14, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | N/A | 75.0 μg/m3 (160) | 160.0 | |
| Jan. 14, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | N/A | 196.0 μg/m3 (246) | 246.0 | |
| Jan. 14, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 191.0 μg/m3 (240) | 240.0 | |
| Jan. 14, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 177.0 μg/m3 (226) | 226.0 | |
| Jan. 14, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | N/A | 174.0 μg/m3 (224) | 224.0 | |
| Jan. 14, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | N/A | 125.0 μg/m3 (187) | 187.0 | |
| Jan. 14, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 138.0 μg/m3 (193) | 193.0 | |
| Jan. 14, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 132.0 μg/m3 (190) | 190.0 | |
| Jan. 14, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 96.0 μg/m3 (171) | 171.0 | |
| Jan. 14, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 89.0 μg/m3 (168) | 168.0 | |
| Jan. 13, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 87.0 μg/m3 (167) | 167.0 | |
| Jan. 13, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 100.0 μg/m3 (173) | 173.0 | |
| Jan. 13, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 166.0 μg/m3 (216) | 216.0 | |
| Jan. 13, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 157.0 μg/m3 (206) | 206.0 | |
| Jan. 13, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 151.0 μg/m3 (200) | 200.0 | |
| Jan. 13, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 213.0 μg/m3 (262) | 262.0 | |
| Jan. 13, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 226.0 μg/m3 (276) | 276.0 | |
| Jan. 13, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 236.0 μg/m3 (286) | 286.0 | |
| Jan. 13, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 216.0 μg/m3 (266) | 266.0 | |
| Jan. 13, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 187.0 μg/m3 (236) | 236.0 | |
| Jan. 13, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 134.0 μg/m3 (191) | 191.0 | |
| Jan. 13, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 122.0 μg/m3 (185) | 185.0 | |
| Jan. 13, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 74.0 μg/m3 (160) | 160.0 | |
| Jan. 13, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 28.0 μg/m3 (84) | 84.0 | |
| Jan. 13, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | 15.0 μg/m3 (56) | 56.0 | |
| Jan. 13, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Jan. 13, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 13, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 5.0 μg/m3 (21) | 28.0 | |
| Jan. 13, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 13, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 13, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 17.0 μg/m3 (61) | 61.0 | |
| Jan. 13, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| Jan. 13, 2019, 1 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 | |
| Jan. 13, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 22.0 μg/m3 (71) | 71.0 | |
| Jan. 12, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 30.0 μg/m3 (88) | 88.0 | |
| Jan. 12, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 110.0 μg/m3 (179) | 179.0 | |
| Jan. 12, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 169.0 μg/m3 (218) | 218.0 | |
| Jan. 12, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 213.0 μg/m3 (262) | 262.0 | |
| Jan. 12, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 388.0 μg/m3 (425) | 425.0 | |
| Jan. 12, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 454.0 μg/m3 (469) | 469.0 | |
| Jan. 12, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 471.0 μg/m3 (480) | 480.0 |