Baltimore (Old Town) MD, US: 39.2981, -76.604698
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| April 10, 2021, 10 a.m. | 5.7 ppb (6) | 1.5 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 | |
| April 10, 2021, 9 a.m. | 4.4 ppb (5) | 0.6 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 5.0 | |
| April 10, 2021, 8 a.m. | 6.0 ppb (6) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (5) | 6.0 | |
| April 10, 2021, 7 a.m. | 6.3 ppb (6) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| April 10, 2021, 6 a.m. | 5.9 ppb (6) | 1.2 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| April 10, 2021, 5 a.m. | 9.8 ppb (10) | 2.0 ppb (2) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 10.0 | |
| April 10, 2021, 4 a.m. | 8.3 ppb (8) | 1.8 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 10, 2021, 3 a.m. | 11.8 ppb (12) | 4.1 ppb (4) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 10, 2021, 2 a.m. | 11.7 ppb (12) | 3.7 ppb (4) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 10, 2021, 1 a.m. | 15.1 ppb (15) | 4.9 ppb (5) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 15.0 | |
| April 10, 2021, midnight | 16.3 ppb (16) | 5.2 ppb (5) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (5) | 16.0 | |
| April 9, 2021, 11 p.m. | 17.6 ppb (17) | 5.5 ppb (6) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 17.0 | |
| April 9, 2021, 10 p.m. | 14.0 ppb (14) | 3.7 ppb (4) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 14.0 | |
| April 9, 2021, 9 p.m. | 15.2 ppb (15) | 4.8 ppb (5) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 15.0 | |
| April 9, 2021, 8 p.m. | 18.9 ppb (18) | 7.4 ppb (7) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 9, 2021, 7 p.m. | 17.2 ppb (17) | 7.9 ppb (8) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 17.0 | |
| April 9, 2021, 6 p.m. | 10.2 ppb (10) | 3.5 ppb (4) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| April 9, 2021, 5 p.m. | 14.0 ppb (14) | 5.0 ppb (5) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 14.0 | |
| April 9, 2021, 4 p.m. | 18.1 ppb (18) | 6.0 ppb (6) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (5) | 18.0 | |
| April 9, 2021, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 9, 2021, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 9, 2021, 1 p.m. | 16.7 ppb (16) | 5.4 ppb (6) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 16.0 | |
| April 9, 2021, noon | 16.7 ppb (16) | 4.9 ppb (5) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 9, 2021, 11 a.m. | 16.5 ppb (16) | 3.8 ppb (4) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 9, 2021, 10 a.m. | 16.5 ppb (16) | 4.6 ppb (5) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 9, 2021, 9 a.m. | 14.5 ppb (14) | 2.9 ppb (3) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 14.0 | |
| April 9, 2021, 8 a.m. | 9.6 ppb (10) | 1.7 ppb (2) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | 10.0 | |
| April 9, 2021, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | 0.0 | |
| April 9, 2021, 6 a.m. | 8.4 ppb (8) | 0.7 ppb (1) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (5) | 8.0 | |
| April 9, 2021, 5 a.m. | 8.4 ppb (8) | 0.7 ppb (1) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (5) | 8.0 | |
| April 9, 2021, 4 a.m. | 9.7 ppb (10) | 1.5 ppb (2) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | -3.0 μg/m3 (0) | 10.0 | |
| April 9, 2021, 3 a.m. | 11.2 ppb (11) | 1.8 ppb (2) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | -2.0 μg/m3 (0) | 11.0 | |
| April 9, 2021, 2 a.m. | 12.2 ppb (12) | 3.1 ppb (3) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 12.0 | |
| April 9, 2021, 1 a.m. | 15.2 ppb (15) | 2.4 ppb (3) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 15.0 | |
| April 9, 2021, midnight | 17.4 ppb (17) | 3.1 ppb (3) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 17.0 | |
| April 8, 2021, 11 p.m. | 20.8 ppb (20) | 2.9 ppb (3) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 20.0 | |
| April 8, 2021, 10 p.m. | 13.6 ppb (13) | 2.9 ppb (3) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 13.0 | |
| April 8, 2021, 9 p.m. | 9.4 ppb (9) | 2.4 ppb (3) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| April 8, 2021, 8 p.m. | 8.7 ppb (9) | 2.6 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | 9.0 | |
| April 8, 2021, 7 p.m. | 9.4 ppb (9) | 3.2 ppb (4) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (5) | 9.0 | |
| April 8, 2021, 6 p.m. | 10.5 ppb (10) | 3.8 ppb (4) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 10.0 | |
| April 8, 2021, 5 p.m. | 8.1 ppb (8) | 2.9 ppb (3) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| April 8, 2021, 4 p.m. | 15.7 ppb (15) | 6.1 ppb (6) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 8, 2021, 3 p.m. | 11.4 ppb (11) | 3.7 ppb (4) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 8, 2021, 2 p.m. | 14.9 ppb (15) | 5.5 ppb (6) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 8, 2021, 1 p.m. | 18.9 ppb (18) | 5.8 ppb (6) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 8, 2021, noon | 23.8 ppb (23) | 7.1 ppb (7) | N/A | 17.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 8, 2021, 11 a.m. | 30.6 ppb (29) | 7.9 ppb (8) | N/A | 23.0 ppb (22) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 8, 2021, 10 a.m. | 17.2 ppb (17) | 3.9 ppb (4) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 8, 2021, 9 a.m. | 10.9 ppb (11) | 2.8 ppb (3) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 8, 2021, 8 a.m. | 11.6 ppb (11) | 2.0 ppb (2) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 8, 2021, 7 a.m. | 8.2 ppb (8) | 1.5 ppb (2) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 8, 2021, 6 a.m. | 10.3 ppb (10) | 1.8 ppb (2) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 8, 2021, 5 a.m. | 12.5 ppb (12) | 1.7 ppb (2) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 8, 2021, 4 a.m. | 9.6 ppb (10) | 1.3 ppb (2) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 8, 2021, 3 a.m. | 14.5 ppb (14) | 2.4 ppb (3) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 8, 2021, 2 a.m. | 18.0 ppb (17) | 2.7 ppb (3) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 8, 2021, 1 a.m. | 14.7 ppb (14) | 2.1 ppb (2) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 8, 2021, midnight | 20.8 ppb (20) | 2.5 ppb (3) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 7, 2021, 11 p.m. | 27.1 ppb (26) | 6.0 ppb (6) | N/A | 21.0 ppb (20) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 7, 2021, 10 p.m. | 20.9 ppb (20) | 3.1 ppb (3) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 15.0 μg/m3 (58) | 58.0 | |
| April 7, 2021, 9 p.m. | 30.5 ppb (29) | 4.8 ppb (5) | N/A | 26.0 ppb (25) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (53) | 53.0 | |
| April 7, 2021, 8 p.m. | 22.6 ppb (22) | 4.4 ppb (5) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (55) | 55.0 | |
| April 7, 2021, 7 p.m. | 15.3 ppb (15) | 3.5 ppb (4) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (55) | 55.0 | |
| April 7, 2021, 6 p.m. | 19.0 ppb (18) | 5.1 ppb (5) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| April 7, 2021, 5 p.m. | 17.7 ppb (17) | 5.1 ppb (5) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 7, 2021, 4 p.m. | 28.1 ppb (27) | 8.9 ppb (9) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| April 7, 2021, 3 p.m. | 30.8 ppb (30) | 9.7 ppb (10) | N/A | 21.0 ppb (20) | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (55) | 55.0 | |
| April 7, 2021, 2 p.m. | 56.1 ppb (54) | 22.2 ppb (21) | N/A | 34.0 ppb (33) | N/A | N/A | N/A | N/A | N/A | 15.0 μg/m3 (58) | 58.0 | |
| April 7, 2021, 1 p.m. | 56.1 ppb (54) | 20.9 ppb (20) | N/A | 35.0 ppb (34) | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (55) | 55.0 | |
| April 7, 2021, noon | 54.3 ppb (52) | 19.3 ppb (19) | N/A | 35.0 ppb (34) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 52.0 | |
| April 7, 2021, 11 a.m. | 45.5 ppb (43) | 13.4 ppb (13) | N/A | 32.0 ppb (31) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 43.0 | |
| April 7, 2021, 10 a.m. | 33.1 ppb (32) | 5.7 ppb (6) | N/A | 27.0 ppb (26) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| April 7, 2021, 9 a.m. | 21.3 ppb (21) | 1.8 ppb (2) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| April 7, 2021, 8 a.m. | 22.3 ppb (22) | 1.6 ppb (2) | N/A | 21.0 ppb (20) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| April 7, 2021, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 μg/m3 (62) | 62.0 | |
| April 7, 2021, 6 a.m. | 61.7 ppb (60) | 14.8 ppb (14) | N/A | 47.0 ppb (45) | N/A | N/A | N/A | N/A | N/A | 20.0 μg/m3 (68) | 68.0 | |
| April 7, 2021, 5 a.m. | 62.7 ppb (61) | 10.0 ppb (10) | N/A | 53.0 ppb (50) | N/A | N/A | N/A | N/A | N/A | 18.0 μg/m3 (64) | 64.0 | |
| April 7, 2021, 4 a.m. | 66.7 ppb (65) | 13.9 ppb (14) | N/A | 53.0 ppb (50) | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (55) | 65.0 | |
| April 7, 2021, 3 a.m. | 58.8 ppb (57) | 10.6 ppb (10) | N/A | 48.0 ppb (46) | N/A | N/A | N/A | N/A | N/A | 17.0 μg/m3 (62) | 62.0 | |
| April 7, 2021, 2 a.m. | 47.9 ppb (46) | 6.7 ppb (7) | N/A | 41.0 ppb (39) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (53) | 53.0 | |
| April 7, 2021, 1 a.m. | 32.2 ppb (31) | 4.3 ppb (5) | N/A | 28.0 ppb (27) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (53) | 53.0 | |
| April 7, 2021, midnight | 44.8 ppb (43) | 6.2 ppb (6) | N/A | 39.0 ppb (37) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| April 6, 2021, 11 p.m. | 29.4 ppb (28) | 4.3 ppb (5) | N/A | 25.0 ppb (24) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| April 6, 2021, 10 p.m. | 9.4 ppb (9) | 1.8 ppb (2) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| April 6, 2021, 9 p.m. | 8.7 ppb (9) | 2.1 ppb (2) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 6, 2021, 8 p.m. | 6.8 ppb (7) | 1.4 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 6, 2021, 7 p.m. | 7.1 ppb (7) | 1.6 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 | |
| April 6, 2021, 6 p.m. | 7.0 ppb (7) | 1.4 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 6, 2021, 5 p.m. | 7.5 ppb (8) | 1.9 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 | |
| April 6, 2021, 4 p.m. | 9.5 ppb (9) | 3.1 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| April 6, 2021, 3 p.m. | 9.5 ppb (9) | 2.5 ppb (3) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| April 6, 2021, 2 p.m. | 14.1 ppb (14) | 3.9 ppb (4) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 14.0 | |
| April 6, 2021, 1 p.m. | 12.9 ppb (13) | 3.7 ppb (4) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 6, 2021, noon | 20.4 ppb (20) | 6.5 ppb (7) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 6, 2021, 11 a.m. | 27.4 ppb (26) | 8.1 ppb (8) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 6, 2021, 10 a.m. | 20.4 ppb (20) | 4.5 ppb (5) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 20.0 | |
| April 6, 2021, 9 a.m. | 9.4 ppb (9) | 1.4 ppb (2) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 6, 2021, 8 a.m. | 8.4 ppb (8) | 3.1 ppb (3) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 6, 2021, 7 a.m. | 7.3 ppb (7) | 0.5 ppb (1) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 6, 2021, 6 a.m. | 7.7 ppb (8) | 0.8 ppb (1) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| April 6, 2021, 5 a.m. | 10.6 ppb (10) | 1.5 ppb (2) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 6, 2021, 4 a.m. | 11.7 ppb (12) | 0.8 ppb (1) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 6, 2021, 3 a.m. | 29.5 ppb (28) | 3.6 ppb (4) | N/A | 26.0 ppb (25) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 6, 2021, 2 a.m. | 24.0 ppb (23) | 0.8 ppb (1) | N/A | 23.0 ppb (22) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 6, 2021, 1 a.m. | 26.8 ppb (26) | 1.0 ppb (1) | N/A | 26.0 ppb (25) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 6, 2021, midnight | 23.5 ppb (23) | 1.3 ppb (2) | N/A | 22.0 ppb (21) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| April 5, 2021, 11 p.m. | 12.8 ppb (13) | 0.4 ppb (1) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 5, 2021, 10 p.m. | 7.8 ppb (8) | 0.9 ppb (1) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 5, 2021, 9 p.m. | 5.9 ppb (6) | 1.0 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 | |
| April 5, 2021, 8 p.m. | 5.7 ppb (6) | 1.2 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 5, 2021, 7 p.m. | 5.5 ppb (6) | 1.1 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 | |
| April 5, 2021, 6 p.m. | 5.6 ppb (6) | 1.3 ppb (2) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| April 5, 2021, 5 p.m. | 6.2 ppb (6) | 1.6 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| April 5, 2021, 4 p.m. | 7.4 ppb (7) | 2.1 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 | |
| April 5, 2021, 3 p.m. | 5.7 ppb (6) | 1.5 ppb (2) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 5, 2021, 2 p.m. | 8.0 ppb (8) | 2.3 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 5, 2021, 1 p.m. | 13.1 ppb (13) | 3.1 ppb (3) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 5, 2021, noon | 22.5 ppb (22) | 4.9 ppb (5) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (53) | 53.0 | |
| April 5, 2021, 11 a.m. | 39.8 ppb (38) | 7.6 ppb (8) | N/A | 32.0 ppb (31) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| April 5, 2021, 10 a.m. | 34.0 ppb (33) | 4.3 ppb (5) | N/A | 30.0 ppb (29) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (53) | 53.0 | |
| April 5, 2021, 9 a.m. | 23.1 ppb (22) | 1.8 ppb (2) | N/A | 21.0 ppb (20) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 5, 2021, 8 a.m. | 41.1 ppb (39) | 6.9 ppb (7) | N/A | 34.0 ppb (33) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 39.0 | |
| April 5, 2021, 7 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 | |
| April 5, 2021, 6 a.m. | 5.2 ppb (5) | 0.2 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 | |
| April 5, 2021, 5 a.m. | 6.3 ppb (6) | 0.4 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 5, 2021, 4 a.m. | 8.6 ppb (9) | 1.3 ppb (2) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 5, 2021, 3 a.m. | 10.0 ppb (10) | 1.3 ppb (2) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 5, 2021, 2 a.m. | 21.5 ppb (21) | 1.2 ppb (2) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| April 5, 2021, 1 a.m. | 23.7 ppb (23) | 1.2 ppb (2) | N/A | 23.0 ppb (22) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| April 5, 2021, midnight | 9.9 ppb (10) | 0.2 ppb (1) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 4, 2021, 11 p.m. | 6.0 ppb (6) | 0.2 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 | |
| April 4, 2021, 10 p.m. | 6.1 ppb (6) | 0.5 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 | |
| April 4, 2021, 9 p.m. | 5.5 ppb (6) | 0.6 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 | |
| April 4, 2021, 8 p.m. | 4.7 ppb (5) | 0.8 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 4, 2021, 7 p.m. | 5.3 ppb (5) | 0.8 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 4, 2021, 6 p.m. | 4.9 ppb (5) | 0.7 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| April 4, 2021, 5 p.m. | 4.9 ppb (5) | 0.7 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| April 4, 2021, 4 p.m. | 4.5 ppb (5) | 0.7 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (53) | 53.0 | |
| April 4, 2021, 3 p.m. | 4.0 ppb (4) | 0.7 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 4, 2021, 2 p.m. | 13.6 ppb (13) | 4.3 ppb (5) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 4, 2021, 1 p.m. | 34.0 ppb (33) | 11.8 ppb (12) | N/A | 22.0 ppb (21) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| April 4, 2021, noon | 38.7 ppb (37) | 11.9 ppb (12) | N/A | 27.0 ppb (26) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 4, 2021, 11 a.m. | 34.9 ppb (33) | 6.9 ppb (7) | N/A | 28.0 ppb (27) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 4, 2021, 10 a.m. | 26.8 ppb (26) | 4.1 ppb (4) | N/A | 23.0 ppb (22) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 4, 2021, 9 a.m. | 15.1 ppb (15) | 0.8 ppb (1) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 4, 2021, 8 a.m. | 15.1 ppb (15) | 0.7 ppb (1) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 4, 2021, 7 a.m. | 19.4 ppb (19) | 3.1 ppb (3) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| April 4, 2021, 6 a.m. | 21.1 ppb (20) | 3.2 ppb (4) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| April 4, 2021, 5 a.m. | 21.4 ppb (21) | 1.8 ppb (2) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 4, 2021, 4 a.m. | 20.7 ppb (20) | 2.3 ppb (3) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (53) | 53.0 | |
| April 4, 2021, 3 a.m. | 29.6 ppb (28) | 4.3 ppb (5) | N/A | 25.0 ppb (24) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| April 4, 2021, 2 a.m. | 29.0 ppb (28) | 6.2 ppb (6) | N/A | 23.0 ppb (22) | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (55) | 55.0 | |
| April 4, 2021, 1 a.m. | 32.4 ppb (31) | 7.0 ppb (7) | N/A | 25.0 ppb (24) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 31.0 | |
| April 4, 2021, midnight | 13.6 ppb (13) | 2.4 ppb (3) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 3, 2021, 11 p.m. | 6.3 ppb (6) | 0.4 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 3, 2021, 10 p.m. | 4.6 ppb (5) | 0.6 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 3, 2021, 9 p.m. | 4.1 ppb (4) | 0.9 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (5) | 5.0 | |
| April 3, 2021, 8 p.m. | 3.3 ppb (4) | 0.8 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| April 3, 2021, 7 p.m. | 4.6 ppb (5) | 1.5 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| April 3, 2021, 6 p.m. | 3.6 ppb (4) | 1.1 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| April 3, 2021, 5 p.m. | 5.2 ppb (5) | 1.6 ppb (2) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| April 3, 2021, 4 p.m. | 3.5 ppb (4) | 1.1 ppb (2) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 3, 2021, 3 p.m. | 4.2 ppb (4) | 1.5 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 3, 2021, 2 p.m. | 4.5 ppb (5) | 1.3 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (5) | 5.0 | |
| April 3, 2021, 1 p.m. | 7.1 ppb (7) | 2.3 ppb (3) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| April 3, 2021, noon | 11.6 ppb (11) | 2.7 ppb (3) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| April 3, 2021, 11 a.m. | 14.8 ppb (14) | 1.6 ppb (2) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 |