Greensboro NC, US: 36.1092, -79.8011
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 23, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 56.0 ppb (43) | N/A | 9.0 μg/m3 (8) | 1.0 μg/m3 (4) | 43.0 | |
| March 23, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 56.0 ppb (43) | N/A | 6.0 μg/m3 (5) | 0.0 μg/m3 (0) | 43.0 | |
| March 23, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | 7.0 μg/m3 (6) | 2.0 μg/m3 (8) | 42.0 | |
| March 23, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | 8.0 μg/m3 (7) | 3.0 μg/m3 (12) | 42.0 | |
| March 23, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | 8.0 μg/m3 (7) | 3.0 μg/m3 (12) | 41.0 | |
| March 23, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | 7.0 μg/m3 (6) | -1.0 μg/m3 (0) | 39.0 | |
| March 23, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 50.0 ppb (38) | N/A | 6.0 μg/m3 (5) | 1.0 μg/m3 (4) | 38.0 | |
| March 23, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | 10.0 μg/m3 (9) | 1.0 μg/m3 (4) | 38.0 | |
| March 23, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | 8.0 μg/m3 (7) | 4.0 μg/m3 (17) | 37.0 | |
| March 23, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 46.0 ppb (35) | N/A | 10.0 μg/m3 (9) | 0.0 μg/m3 (0) | 35.0 | |
| March 23, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | 10.0 μg/m3 (9) | -2.0 μg/m3 (0) | 32.0 | |
| March 23, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | 11.0 μg/m3 (10) | -2.0 μg/m3 (0) | 30.0 | |
| March 23, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 44.0 ppb (34) | N/A | 12.0 μg/m3 (11) | 4.0 μg/m3 (17) | 34.0 | |
| March 23, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | 12.0 μg/m3 (11) | 1.0 μg/m3 (4) | 32.0 | |
| March 23, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (11) | 2.0 μg/m3 (8) | 11.0 | |
| March 23, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | 9.0 μg/m3 (8) | 0.0 μg/m3 (0) | 32.0 | |
| March 23, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | 10.0 μg/m3 (9) | 1.0 μg/m3 (4) | 31.0 | |
| March 23, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | 11.0 μg/m3 (10) | 1.0 μg/m3 (4) | 36.0 | |
| March 23, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | 17.0 μg/m3 (15) | 3.0 μg/m3 (12) | 37.0 | |
| March 23, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | 17.0 μg/m3 (15) | 5.0 μg/m3 (21) | 32.0 | |
| March 23, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | 17.0 μg/m3 (15) | 4.0 μg/m3 (17) | 36.0 | |
| March 23, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | 15.0 μg/m3 (14) | 3.0 μg/m3 (12) | 37.0 | |
| March 23, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | 16.0 μg/m3 (15) | 4.0 μg/m3 (17) | 42.0 | |
| March 22, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 52.0 ppb (40) | N/A | 15.0 μg/m3 (14) | 2.0 μg/m3 (8) | 40.0 | |
| March 22, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 50.0 ppb (38) | N/A | 16.0 μg/m3 (15) | 3.0 μg/m3 (12) | 38.0 | |
| March 22, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | 11.0 μg/m3 (10) | 8.0 μg/m3 (33) | 39.0 | |
| March 22, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 52.0 ppb (40) | N/A | 11.0 μg/m3 (10) | 4.0 μg/m3 (17) | 40.0 | |
| March 22, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | 12.0 μg/m3 (11) | 2.0 μg/m3 (8) | 39.0 | |
| March 22, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | 12.0 μg/m3 (11) | 3.0 μg/m3 (12) | 38.0 | |
| March 22, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | 16.0 μg/m3 (15) | 7.0 μg/m3 (29) | 37.0 | |
| March 22, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | 11.0 μg/m3 (10) | 2.0 μg/m3 (8) | 36.0 | |
| March 22, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | 14.0 μg/m3 (13) | 6.0 μg/m3 (25) | 35.0 | |
| March 22, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | 20.0 μg/m3 (18) | 4.0 μg/m3 (17) | 33.0 | |
| March 22, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | 11.0 μg/m3 (10) | 2.0 μg/m3 (8) | 32.0 | |
| March 22, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | 13.0 μg/m3 (12) | 0.0 μg/m3 (0) | 29.0 | |
| March 22, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | 14.0 μg/m3 (13) | 4.0 μg/m3 (17) | 27.0 | |
| March 22, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | 10.0 μg/m3 (9) | 2.0 μg/m3 (8) | 25.0 | |
| March 22, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | 13.0 μg/m3 (12) | 3.0 μg/m3 (12) | 27.0 | |
| March 22, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (9) | 4.0 μg/m3 (17) | 17.0 | |
| March 22, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | 15.0 μg/m3 (14) | 1.0 μg/m3 (4) | 31.0 | |
| March 22, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | 13.0 μg/m3 (12) | 0.0 μg/m3 (0) | 32.0 | |
| March 22, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | 15.0 μg/m3 (14) | 2.0 μg/m3 (8) | 32.0 | |
| March 22, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | 13.0 μg/m3 (12) | 2.0 μg/m3 (8) | 33.0 | |
| March 22, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | 15.0 μg/m3 (14) | 1.0 μg/m3 (4) | 35.0 | |
| March 22, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 44.0 ppb (34) | N/A | 19.0 μg/m3 (17) | 11.0 μg/m3 (46) | 46.0 | |
| March 22, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | 17.0 μg/m3 (15) | 2.0 μg/m3 (8) | 38.0 | |
| March 22, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | 20.0 μg/m3 (18) | 6.0 μg/m3 (25) | 41.0 | |
| March 21, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 57.0 ppb (44) | N/A | 20.0 μg/m3 (18) | 6.0 μg/m3 (25) | 44.0 | |
| March 21, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 58.0 ppb (45) | N/A | 19.0 μg/m3 (17) | 5.0 μg/m3 (21) | 45.0 | |
| March 21, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 59.0 ppb (45) | N/A | 24.0 μg/m3 (22) | 11.0 μg/m3 (46) | 46.0 | |
| March 21, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 58.0 ppb (45) | N/A | 16.0 μg/m3 (15) | 11.0 μg/m3 (46) | 46.0 | |
| March 21, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 52.0 ppb (40) | N/A | 10.0 μg/m3 (9) | 10.0 μg/m3 (42) | 42.0 | |
| March 21, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | 11.0 μg/m3 (10) | 8.0 μg/m3 (33) | 38.0 | |
| March 21, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | 10.0 μg/m3 (9) | 2.0 μg/m3 (8) | 38.0 | |
| March 21, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | 9.0 μg/m3 (8) | 2.0 μg/m3 (8) | 37.0 | |
| March 21, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | 11.0 μg/m3 (10) | -2.0 μg/m3 (0) | 35.0 | |
| March 21, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 44.0 ppb (34) | N/A | 10.0 μg/m3 (9) | 2.0 μg/m3 (8) | 34.0 | |
| March 21, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | 11.0 μg/m3 (10) | 2.0 μg/m3 (8) | 33.0 | |
| March 21, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | 11.0 μg/m3 (10) | 0.0 μg/m3 (0) | 32.0 | |
| March 21, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | 11.0 μg/m3 (10) | 2.0 μg/m3 (8) | 32.0 | |
| March 21, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | 14.0 μg/m3 (13) | 6.0 μg/m3 (25) | 32.0 | |
| March 21, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | 11.0 μg/m3 (10) | -2.0 μg/m3 (0) | 33.0 | |
| March 21, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (9) | 1.0 μg/m3 (4) | 9.0 | |
| March 21, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | 12.0 μg/m3 (11) | 0.0 μg/m3 (0) | 32.0 | |
| March 21, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | 15.0 μg/m3 (14) | -3.0 μg/m3 (0) | 33.0 | |
| March 21, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | 15.0 μg/m3 (14) | 10.0 μg/m3 (42) | 42.0 | |
| March 21, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | 12.0 μg/m3 (11) | 5.0 μg/m3 (21) | 32.0 | |
| March 21, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | 19.0 μg/m3 (17) | 5.0 μg/m3 (21) | 33.0 | |
| March 21, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | 23.0 μg/m3 (21) | 8.0 μg/m3 (33) | 33.0 | |
| March 21, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | 14.0 μg/m3 (13) | 1.0 μg/m3 (4) | 35.0 | |
| March 21, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | 17.0 μg/m3 (15) | 5.0 μg/m3 (21) | 39.0 | |
| March 20, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | 17.0 μg/m3 (15) | 7.0 μg/m3 (29) | 41.0 | |
| March 20, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | 24.0 μg/m3 (22) | 4.0 μg/m3 (17) | 42.0 | |
| March 20, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 56.0 ppb (43) | N/A | 26.0 μg/m3 (24) | 11.0 μg/m3 (46) | 46.0 | |
| March 20, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 56.0 ppb (43) | N/A | 18.0 μg/m3 (16) | 4.0 μg/m3 (17) | 43.0 | |
| March 20, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 56.0 ppb (43) | N/A | 16.0 μg/m3 (15) | 4.0 μg/m3 (17) | 43.0 | |
| March 20, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | 19.0 μg/m3 (17) | 5.0 μg/m3 (21) | 42.0 | |
| March 20, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | 16.0 μg/m3 (15) | 5.0 μg/m3 (21) | 42.0 | |
| March 20, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 52.0 ppb (40) | N/A | 18.0 μg/m3 (16) | 11.0 μg/m3 (46) | 46.0 | |
| March 20, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | 22.0 μg/m3 (20) | 6.0 μg/m3 (25) | 38.0 | |
| March 20, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 46.0 ppb (35) | N/A | 17.0 μg/m3 (15) | 11.0 μg/m3 (46) | 46.0 | |
| March 20, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | 17.0 μg/m3 (15) | 7.0 μg/m3 (29) | 32.0 | |
| March 20, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | 18.0 μg/m3 (16) | 3.0 μg/m3 (12) | 24.0 | |
| March 20, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | 14.0 μg/m3 (13) | 7.0 μg/m3 (29) | 29.0 | |
| March 20, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | 16.0 μg/m3 (15) | 3.0 μg/m3 (12) | 15.0 | |
| March 20, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | 18.0 μg/m3 (16) | 5.0 μg/m3 (21) | 21.0 | |
| March 20, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 μg/m3 (16) | 7.0 μg/m3 (29) | 29.0 | |
| March 20, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 22.0 μg/m3 (20) | 11.0 μg/m3 (46) | 46.0 | |
| March 20, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | 18.0 μg/m3 (16) | 4.0 μg/m3 (17) | 17.0 | |
| March 20, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | 28.0 μg/m3 (25) | 7.0 μg/m3 (29) | 29.0 | |
| March 20, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | 24.0 μg/m3 (22) | 9.0 μg/m3 (38) | 38.0 | |
| March 20, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | 24.0 μg/m3 (22) | 13.0 μg/m3 (52) | 52.0 | |
| March 20, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | 20.0 μg/m3 (18) | 6.0 μg/m3 (25) | 25.0 | |
| March 20, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 13.0 μg/m3 (12) | 4.0 μg/m3 (17) | 17.0 | |
| March 20, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | 15.0 μg/m3 (14) | 3.0 μg/m3 (12) | 32.0 | |
| March 19, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | 20.0 μg/m3 (18) | 3.0 μg/m3 (12) | 39.0 | |
| March 19, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | 12.0 μg/m3 (11) | 8.0 μg/m3 (33) | 42.0 | |
| March 19, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 55.0 ppb (42) | N/A | 17.0 μg/m3 (15) | 11.0 μg/m3 (46) | 46.0 | |
| March 19, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | 16.0 μg/m3 (15) | 6.0 μg/m3 (25) | 42.0 | |
| March 19, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | 17.0 μg/m3 (15) | 2.0 μg/m3 (8) | 42.0 | |
| March 19, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 52.0 ppb (40) | N/A | 14.0 μg/m3 (13) | 9.0 μg/m3 (38) | 40.0 | |
| March 19, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | 14.0 μg/m3 (13) | 3.0 μg/m3 (12) | 39.0 | |
| March 19, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | 11.0 μg/m3 (10) | 5.0 μg/m3 (21) | 38.0 | |
| March 19, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | 12.0 μg/m3 (11) | 5.0 μg/m3 (21) | 37.0 | |
| March 19, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | 15.0 μg/m3 (14) | 10.0 μg/m3 (42) | 42.0 | |
| March 19, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | 17.0 μg/m3 (15) | 5.0 μg/m3 (21) | 31.0 | |
| March 19, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 16.0 μg/m3 (15) | -2.0 μg/m3 (0) | 16.0 | |
| March 19, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 16.0 μg/m3 (15) | 1.0 μg/m3 (4) | 15.0 | |
| March 19, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 12.0 μg/m3 (11) | 8.0 μg/m3 (33) | 33.0 | |
| March 19, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 14.0 μg/m3 (13) | 2.0 μg/m3 (8) | 26.0 | |
| March 19, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (13) | 4.0 μg/m3 (17) | 17.0 | |
| March 19, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | 11.0 μg/m3 (10) | 6.0 μg/m3 (25) | 25.0 | |
| March 19, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | 11.0 μg/m3 (10) | 3.0 μg/m3 (12) | 23.0 | |
| March 19, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | 13.0 μg/m3 (12) | 4.0 μg/m3 (17) | 25.0 | |
| March 19, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | 12.0 μg/m3 (11) | 0.0 μg/m3 (0) | 29.0 | |
| March 19, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | 15.0 μg/m3 (14) | 0.0 μg/m3 (0) | 33.0 | |
| March 19, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | 14.0 μg/m3 (13) | 5.0 μg/m3 (21) | 35.0 | |
| March 19, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 46.0 ppb (35) | N/A | 14.0 μg/m3 (13) | 0.0 μg/m3 (0) | 35.0 | |
| March 19, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | 16.0 μg/m3 (15) | -1.0 μg/m3 (0) | 37.0 | |
| March 18, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 49.0 ppb (38) | N/A | 16.0 μg/m3 (15) | -2.0 μg/m3 (0) | 38.0 | |
| March 18, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 50.0 ppb (38) | N/A | 12.0 μg/m3 (11) | -1.0 μg/m3 (0) | 38.0 | |
| March 18, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 52.0 ppb (40) | N/A | 14.0 μg/m3 (13) | 10.0 μg/m3 (42) | 42.0 | |
| March 18, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | 11.0 μg/m3 (10) | 6.0 μg/m3 (25) | 41.0 | |
| March 18, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | 13.0 μg/m3 (12) | 5.0 μg/m3 (21) | 41.0 | |
| March 18, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 52.0 ppb (40) | N/A | 10.0 μg/m3 (9) | 5.0 μg/m3 (21) | 40.0 | |
| March 18, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | 12.0 μg/m3 (11) | 6.0 μg/m3 (25) | 39.0 | |
| March 18, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | 15.0 μg/m3 (14) | 8.0 μg/m3 (33) | 37.0 | |
| March 18, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 46.0 ppb (35) | N/A | 14.0 μg/m3 (13) | 3.0 μg/m3 (12) | 35.0 | |
| March 18, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | 11.0 μg/m3 (10) | 4.0 μg/m3 (17) | 33.0 | |
| March 18, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | 15.0 μg/m3 (14) | 3.0 μg/m3 (12) | 31.0 | |
| March 18, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | 17.0 μg/m3 (15) | 0.0 μg/m3 (0) | 24.0 | |
| March 18, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | 20.0 μg/m3 (18) | 4.0 μg/m3 (17) | 18.0 | |
| March 18, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | 19.0 μg/m3 (17) | 8.0 μg/m3 (33) | 33.0 | |
| March 18, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | 22.0 μg/m3 (20) | 6.0 μg/m3 (25) | 25.0 | |
| March 18, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 μg/m3 (23) | 10.0 μg/m3 (42) | 42.0 | |
| March 18, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | 30.0 μg/m3 (27) | 13.0 μg/m3 (52) | 52.0 | |
| March 18, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | 30.0 μg/m3 (27) | 16.0 μg/m3 (59) | 59.0 | |
| March 18, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | 23.0 μg/m3 (21) | 16.0 μg/m3 (59) | 59.0 | |
| March 18, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | 22.0 μg/m3 (20) | 12.0 μg/m3 (50) | 50.0 | |
| March 18, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 18.0 μg/m3 (16) | 11.0 μg/m3 (46) | 46.0 | |
| March 18, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 16.0 μg/m3 (15) | 8.0 μg/m3 (33) | 33.0 | |
| March 18, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | 18.0 μg/m3 (16) | 7.0 μg/m3 (29) | 29.0 | |
| March 18, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | 11.0 μg/m3 (10) | 0.0 μg/m3 (0) | 25.0 | |
| March 17, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | 13.0 μg/m3 (12) | 0.0 μg/m3 (0) | 37.0 | |
| March 17, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | 10.0 μg/m3 (9) | 3.0 μg/m3 (12) | 41.0 | |
| March 17, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 54.0 ppb (42) | N/A | 9.0 μg/m3 (8) | 4.0 μg/m3 (17) | 42.0 | |
| March 17, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 53.0 ppb (41) | N/A | 10.0 μg/m3 (9) | -1.0 μg/m3 (0) | 41.0 | |
| March 17, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | 8.0 μg/m3 (7) | 8.0 μg/m3 (33) | 39.0 | |
| March 17, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 51.0 ppb (39) | N/A | 10.0 μg/m3 (9) | 1.0 μg/m3 (4) | 39.0 | |
| March 17, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 50.0 ppb (38) | N/A | 10.0 μg/m3 (9) | 5.0 μg/m3 (21) | 38.0 | |
| March 17, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 48.0 ppb (37) | N/A | 7.0 μg/m3 (6) | 3.0 μg/m3 (12) | 37.0 | |
| March 17, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 47.0 ppb (36) | N/A | 9.0 μg/m3 (8) | 4.0 μg/m3 (17) | 36.0 | |
| March 17, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 45.0 ppb (35) | N/A | 9.0 μg/m3 (8) | 6.0 μg/m3 (25) | 35.0 | |
| March 17, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | 10.0 μg/m3 (9) | 7.0 μg/m3 (29) | 32.0 | |
| March 17, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 14.0 μg/m3 (13) | N/A | 15.0 | |
| March 17, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | 13.0 μg/m3 (12) | 3.0 μg/m3 (12) | 12.0 | |
| March 17, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | 14.0 μg/m3 (13) | 2.0 μg/m3 (8) | 17.0 | |
| March 17, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 12.0 μg/m3 (11) | 3.0 μg/m3 (12) | 18.0 | |
| March 17, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (11) | 5.0 μg/m3 (21) | 21.0 | |
| March 17, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 14.0 μg/m3 (13) | 4.0 μg/m3 (17) | 26.0 | |
| March 17, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 15.0 μg/m3 (14) | 3.0 μg/m3 (12) | 19.0 | |
| March 17, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | 12.0 μg/m3 (11) | 7.0 μg/m3 (29) | 29.0 | |
| March 17, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | 17.0 μg/m3 (15) | 6.0 μg/m3 (25) | 25.0 | |
| March 17, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | 29.0 μg/m3 (26) | 6.0 μg/m3 (25) | 26.0 | |
| March 17, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 28.0 μg/m3 (25) | 12.0 μg/m3 (50) | 50.0 | |
| March 17, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 17.0 μg/m3 (15) | 14.0 μg/m3 (54) | 54.0 | |
| March 17, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 16.0 μg/m3 (15) | 7.0 μg/m3 (29) | 29.0 | |
| March 16, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 42.0 ppb (32) | N/A | 11.0 μg/m3 (10) | 4.0 μg/m3 (17) | 32.0 |