Baltimore MD, US: 39.2981, -76.604698
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| May 21, 2019, 3 p.m. | 5.7 ppb (5) | N/A | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 | |
| May 21, 2019, 2 p.m. | 4.7 ppb (4) | N/A | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 | |
| May 21, 2019, 1 p.m. | 7.9 ppb (7) | N/A | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 | |
| May 21, 2019, noon | 7.5 ppb (7) | N/A | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 | |
| May 21, 2019, 11 a.m. | 7.9 ppb (7) | 2.7 ppb (3) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 | |
| May 21, 2019, 10 a.m. | 7.4 ppb (7) | 1.5 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 | |
| May 21, 2019, 9 a.m. | 5.6 ppb (5) | 1.1 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 | |
| May 21, 2019, 8 a.m. | 3.6 ppb (3) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 | |
| May 21, 2019, 7 a.m. | 3.7 ppb (3) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 | |
| May 21, 2019, 6 a.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 | |
| May 21, 2019, 5 a.m. | 3.3 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 | |
| May 21, 2019, 4 a.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 | |
| May 21, 2019, 3 a.m. | 3.5 ppb (3) | 0.1 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 | |
| May 21, 2019, 2 a.m. | 4.3 ppb (4) | 0.1 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 | |
| May 21, 2019, 1 a.m. | 3.9 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 | |
| May 21, 2019, midnight | 4.0 ppb (4) | 0.2 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 | |
| May 20, 2019, 11 p.m. | 4.3 ppb (4) | 0.4 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 | |
| May 20, 2019, 10 p.m. | 9.9 ppb (9) | 1.9 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 | |
| May 20, 2019, 9 p.m. | 5.8 ppb (5) | 0.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 | |
| May 20, 2019, 8 p.m. | 6.2 ppb (6) | 1.1 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 | |
| May 20, 2019, 7 p.m. | 6.8 ppb (6) | 1.5 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 | |
| May 20, 2019, 6 p.m. | 6.8 ppb (6) | 1.9 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 | |
| May 20, 2019, 5 p.m. | 4.3 ppb (4) | 0.9 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 | |
| May 20, 2019, 4 p.m. | 3.7 ppb (3) | 0.7 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 | |
| May 20, 2019, 3 p.m. | 5.8 ppb (5) | 1.3 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 | |
| May 20, 2019, 2 p.m. | 8.5 ppb (8) | 1.8 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 | |
| May 20, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 20, 2019, noon | 18.0 ppb (17) | 5.2 ppb (5) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 20, 2019, 11 a.m. | 22.8 ppb (21) | 5.2 ppb (5) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 20, 2019, 10 a.m. | 16.9 ppb (16) | 2.1 ppb (2) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 20, 2019, 9 a.m. | 8.6 ppb (8) | 0.4 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 20, 2019, 8 a.m. | 7.0 ppb (6) | 0.1 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 20, 2019, 7 a.m. | 13.6 ppb (13) | 0.3 ppb (0) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 20, 2019, 6 a.m. | 6.5 ppb (6) | 0.3 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 20, 2019, 5 a.m. | 8.4 ppb (8) | 0.3 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 16.0 μg/m3 (59) | 59.0 | |
| May 20, 2019, 4 a.m. | 6.3 ppb (6) | 0.9 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 20, 2019, 3 a.m. | 11.7 ppb (11) | 1.8 ppb (2) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 20, 2019, 2 a.m. | 14.7 ppb (14) | 1.4 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 16.0 μg/m3 (59) | 59.0 | |
| May 20, 2019, 1 a.m. | 10.0 ppb (9) | 1.1 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 20, 2019, midnight | 9.2 ppb (9) | 1.6 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 19.0 μg/m3 (65) | 65.0 | |
| May 19, 2019, 11 p.m. | 9.2 ppb (9) | 1.1 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 19, 2019, 10 p.m. | 6.8 ppb (6) | 1.2 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 9 p.m. | 7.9 ppb (7) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 19, 2019, 8 p.m. | 10.8 ppb (10) | 2.0 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 19, 2019, 7 p.m. | 9.3 ppb (9) | 2.1 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 16.0 μg/m3 (59) | 59.0 | |
| May 19, 2019, 6 p.m. | 7.8 ppb (7) | 1.8 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 19, 2019, 5 p.m. | 8.7 ppb (8) | 1.7 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 19, 2019, 4 p.m. | 9.5 ppb (9) | 2.2 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 19, 2019, 3 p.m. | 6.4 ppb (6) | 1.3 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 19, 2019, 2 p.m. | 6.5 ppb (6) | 1.7 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 19, 2019, 1 p.m. | 8.5 ppb (8) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 19, 2019, noon | 18.3 ppb (17) | 4.2 ppb (4) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 11 a.m. | 13.1 ppb (12) | 2.3 ppb (2) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 19, 2019, 10 a.m. | 10.4 ppb (10) | 1.3 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 19, 2019, 9 a.m. | 12.0 ppb (11) | 1.6 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 19, 2019, 8 a.m. | 10.2 ppb (9) | 0.7 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 19, 2019, 7 a.m. | 10.1 ppb (9) | 0.4 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 6 a.m. | 19.1 ppb (18) | 1.9 ppb (2) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 19, 2019, 5 a.m. | 11.9 ppb (11) | 0.9 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 19, 2019, 4 a.m. | 15.9 ppb (15) | 1.4 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 3 a.m. | 12.2 ppb (11) | 1.7 ppb (2) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 2 a.m. | 16.5 ppb (15) | 1.2 ppb (1) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 19, 2019, 1 a.m. | 14.0 ppb (13) | 1.3 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 19, 2019, midnight | 25.6 ppb (24) | 1.4 ppb (1) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | N/A | N/A | 17.0 μg/m3 (61) | 61.0 | |
| May 18, 2019, 11 p.m. | 13.9 ppb (13) | 1.3 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 18, 2019, 10 p.m. | 11.0 ppb (10) | 1.4 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 18, 2019, 9 p.m. | 9.8 ppb (9) | 1.9 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 18, 2019, 8 p.m. | 9.6 ppb (9) | 2.1 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 18, 2019, 7 p.m. | 8.7 ppb (8) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 18, 2019, 6 p.m. | 6.8 ppb (6) | 1.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 18, 2019, 5 p.m. | 8.0 ppb (7) | 2.1 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 18, 2019, 4 p.m. | 7.0 ppb (6) | 2.2 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 18, 2019, 3 p.m. | 8.6 ppb (8) | 2.4 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 18, 2019, 2 p.m. | 11.1 ppb (10) | 3.4 ppb (3) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 17.0 μg/m3 (61) | 61.0 | |
| May 18, 2019, 1 p.m. | 8.5 ppb (8) | 2.6 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 18, 2019, noon | 11.4 ppb (11) | 3.7 ppb (3) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 18, 2019, 11 a.m. | 14.4 ppb (13) | 3.7 ppb (3) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 18, 2019, 10 a.m. | 15.9 ppb (15) | 1.6 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 18, 2019, 9 a.m. | 14.5 ppb (13) | 1.3 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 18, 2019, 8 a.m. | 16.8 ppb (16) | 1.5 ppb (1) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 18, 2019, 7 a.m. | 8.3 ppb (8) | 0.1 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 18, 2019, 6 a.m. | 8.3 ppb (8) | 0.1 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 18, 2019, 5 a.m. | 4.8 ppb (4) | 0.1 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 18, 2019, 4 a.m. | 6.1 ppb (6) | 0.2 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 18, 2019, 3 a.m. | 6.6 ppb (6) | 0.2 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 18, 2019, 2 a.m. | 8.7 ppb (8) | 0.2 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 18, 2019, 1 a.m. | 8.0 ppb (7) | 0.2 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 18, 2019, midnight | 6.9 ppb (6) | 0.3 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 17, 2019, 11 p.m. | 5.2 ppb (5) | 0.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 17, 2019, 10 p.m. | 5.2 ppb (5) | 0.9 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 17, 2019, 9 p.m. | 5.6 ppb (5) | 0.7 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 17, 2019, 8 p.m. | 6.1 ppb (6) | 0.9 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 17, 2019, 7 p.m. | 10.0 ppb (9) | 2.3 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 17, 2019, 6 p.m. | 6.2 ppb (6) | 1.5 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 17, 2019, 5 p.m. | 6.6 ppb (6) | 1.4 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 17, 2019, 4 p.m. | 16.0 ppb (15) | 5.1 ppb (5) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 17, 2019, 3 p.m. | 16.5 ppb (15) | 3.7 ppb (3) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 17, 2019, 2 p.m. | 18.6 ppb (17) | 4.3 ppb (4) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 17, 2019, 1 p.m. | 31.7 ppb (29) | 11.1 ppb (10) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 17, 2019, noon | 45.2 ppb (42) | 18.0 ppb (17) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 17, 2019, 11 a.m. | 41.7 ppb (39) | 12.6 ppb (12) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 17, 2019, 10 a.m. | 43.7 ppb (40) | 10.2 ppb (9) | N/A | 34.0 ppb (31) | N/A | N/A | N/A | N/A | N/A | 18.0 μg/m3 (63) | 63.0 | |
| May 17, 2019, 9 a.m. | 29.0 ppb (27) | 3.0 ppb (3) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 17, 2019, 8 a.m. | 21.6 ppb (20) | 0.8 ppb (1) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 17, 2019, 7 a.m. | 14.7 ppb (14) | 1.2 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 17, 2019, 6 a.m. | 12.3 ppb (11) | 0.8 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 17, 2019, 5 a.m. | 13.6 ppb (13) | 1.3 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 17, 2019, 4 a.m. | 12.9 ppb (12) | 1.2 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 17, 2019, 3 a.m. | 12.6 ppb (12) | 1.3 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 17, 2019, 2 a.m. | 15.6 ppb (14) | 2.0 ppb (2) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 17, 2019, 1 a.m. | 17.6 ppb (16) | 1.4 ppb (1) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 17, 2019, midnight | 15.9 ppb (15) | 1.1 ppb (1) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 16, 2019, 11 p.m. | 15.2 ppb (14) | 1.5 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 16, 2019, 10 p.m. | 8.4 ppb (8) | 1.0 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 16, 2019, 9 p.m. | 5.6 ppb (5) | 1.2 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 16, 2019, 8 p.m. | 6.2 ppb (6) | 1.3 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 16, 2019, 7 p.m. | 6.6 ppb (6) | 1.7 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 16, 2019, 6 p.m. | 5.2 ppb (5) | 1.2 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 16, 2019, 5 p.m. | 4.4 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 16, 2019, 4 p.m. | 4.6 ppb (4) | 1.1 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 16, 2019, 3 p.m. | 6.0 ppb (6) | 1.9 ppb (2) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 16, 2019, 2 p.m. | 9.1 ppb (8) | 2.4 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 16, 2019, 1 p.m. | 17.6 ppb (16) | 5.0 ppb (5) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 16, 2019, noon | 19.7 ppb (18) | 4.9 ppb (5) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 16, 2019, 11 a.m. | 24.3 ppb (23) | 3.6 ppb (3) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 16, 2019, 10 a.m. | 15.9 ppb (15) | 2.3 ppb (2) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 16, 2019, 9 a.m. | 9.8 ppb (9) | 0.4 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 16, 2019, 8 a.m. | 7.8 ppb (7) | 0.2 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 16, 2019, 7 a.m. | 5.1 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 16, 2019, 6 a.m. | 10.0 ppb (9) | 0.4 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 16, 2019, 5 a.m. | 8.4 ppb (8) | 0.4 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 16, 2019, 4 a.m. | 12.4 ppb (11) | 0.6 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 16, 2019, 3 a.m. | 8.9 ppb (8) | 0.4 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 16, 2019, 2 a.m. | 9.9 ppb (9) | 0.4 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 16, 2019, 1 a.m. | 9.6 ppb (9) | 0.5 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 16, 2019, midnight | 8.8 ppb (8) | 0.3 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 15, 2019, 11 p.m. | 7.6 ppb (7) | 0.7 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 15, 2019, 10 p.m. | 6.1 ppb (6) | 0.9 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 8.0 | |
| May 15, 2019, 9 p.m. | 6.3 ppb (6) | 1.3 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 8.0 | |
| May 15, 2019, 8 p.m. | 6.5 ppb (6) | 1.4 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 8.0 | |
| May 15, 2019, 7 p.m. | 6.8 ppb (6) | 2.1 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 8.0 | |
| May 15, 2019, 6 p.m. | 4.6 ppb (4) | 1.4 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 4.0 | |
| May 15, 2019, 5 p.m. | 3.9 ppb (4) | 1.3 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 4.0 | |
| May 15, 2019, 4 p.m. | 4.0 ppb (4) | 1.3 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 4.0 | |
| May 15, 2019, 3 p.m. | 4.5 ppb (4) | 1.6 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 8.0 | |
| May 15, 2019, 2 p.m. | 6.2 ppb (6) | 2.2 ppb (2) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 8.0 | |
| May 15, 2019, 1 p.m. | 9.6 ppb (9) | 3.2 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 9.0 | |
| May 15, 2019, noon | 16.8 ppb (16) | 6.5 ppb (6) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 16.0 | |
| May 15, 2019, 11 a.m. | 20.1 ppb (19) | 7.1 ppb (7) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 19.0 | |
| May 15, 2019, 10 a.m. | 20.3 ppb (19) | 4.8 ppb (4) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 19.0 | |
| May 15, 2019, 9 a.m. | 10.7 ppb (10) | 1.3 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 10.0 | |
| May 15, 2019, 8 a.m. | 10.1 ppb (9) | 0.6 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 9.0 | |
| May 15, 2019, 7 a.m. | 9.4 ppb (9) | 0.6 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 9.0 | |
| May 15, 2019, 6 a.m. | 4.7 ppb (4) | 0.2 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 4.0 | |
| May 15, 2019, 5 a.m. | 6.8 ppb (6) | 0.1 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | 6.0 | |
| May 15, 2019, 4 a.m. | 8.0 ppb (7) | 0.4 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | 7.0 | |
| May 15, 2019, 3 a.m. | 9.8 ppb (9) | 0.4 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 15, 2019, 2 a.m. | 12.1 ppb (11) | 0.6 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 15, 2019, 1 a.m. | 13.9 ppb (13) | 1.5 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 13.0 | |
| May 15, 2019, midnight | 6.9 ppb (6) | 0.5 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 6.0 | |
| May 14, 2019, 11 p.m. | 6.8 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 6.0 | |
| May 14, 2019, 10 p.m. | 5.5 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 14, 2019, 9 p.m. | 5.3 ppb (5) | 1.5 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 14, 2019, 8 p.m. | 4.8 ppb (4) | 1.4 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 4.0 | |
| May 14, 2019, 7 p.m. | 5.3 ppb (5) | 1.8 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 5.0 | |
| May 14, 2019, 6 p.m. | 6.9 ppb (6) | 2.1 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | 6.0 | |
| May 14, 2019, 5 p.m. | 6.8 ppb (6) | 2.1 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 6.0 | |
| May 14, 2019, 4 p.m. | 6.9 ppb (6) | 2.3 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 |