Boston (S Boston) MA, US: 42.325197, -71.056056
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| April 21, 2021, 6 p.m. | 11.0 ppb (11) | 3.0 ppb (3) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| April 21, 2021, 5 p.m. | 14.0 ppb (14) | 4.0 ppb (4) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 21, 2021, 4 p.m. | 13.0 ppb (13) | 5.0 ppb (5) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 21, 2021, 3 p.m. | 18.0 ppb (17) | 7.0 ppb (7) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 21, 2021, 2 p.m. | 16.0 ppb (16) | 6.0 ppb (6) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 21, 2021, 1 p.m. | 22.0 ppb (21) | 9.0 ppb (9) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 21, 2021, noon | 20.0 ppb (19) | 7.0 ppb (7) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 21, 2021, 11 a.m. | 27.0 ppb (26) | 10.0 ppb (10) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.05 ppb (2) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 21, 2021, 10 a.m. | 37.0 ppb (35) | 11.0 ppb (11) | N/A | 26.0 ppb (25) | N/A | N/A | N/A | 0.11 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 21, 2021, 9 a.m. | 42.0 ppb (40) | 11.0 ppb (11) | N/A | 30.0 ppb (29) | N/A | N/A | N/A | 0.16 ppb (3) | N/A | 14.0 μg/m3 (55) | 55.0 | |
| April 21, 2021, 8 a.m. | 32.0 ppb (31) | 6.0 ppb (6) | N/A | 27.0 ppb (26) | N/A | N/A | N/A | 0.1 ppb (2) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| April 21, 2021, 7 a.m. | 21.0 ppb (20) | 3.0 ppb (3) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 21, 2021, 6 a.m. | 19.0 ppb (18) | 3.0 ppb (3) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| April 21, 2021, 5 a.m. | 16.0 ppb (16) | 1.0 ppb (1) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| April 21, 2021, 4 a.m. | 20.0 ppb (19) | 1.0 ppb (1) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.13 ppb (2) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 21, 2021, 3 a.m. | 17.0 ppb (17) | 2.0 ppb (2) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | 0.2 ppb (3) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| April 21, 2021, 2 a.m. | 16.0 ppb (16) | 2.0 ppb (2) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 13.0 μg/m3 (53) | 53.0 | |
| April 21, 2021, 1 a.m. | 15.0 ppb (15) | 1.0 ppb (1) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 21, 2021, midnight | 16.0 ppb (16) | 1.0 ppb (1) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| April 20, 2021, 11 p.m. | 17.0 ppb (17) | 2.0 ppb (2) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.17 ppb (3) | N/A | 15.0 μg/m3 (58) | 58.0 | |
| April 20, 2021, 10 p.m. | 14.0 ppb (14) | 2.0 ppb (2) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.07 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 20, 2021, 9 p.m. | 10.0 ppb (10) | 2.0 ppb (2) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 20, 2021, 8 p.m. | 14.0 ppb (14) | 3.0 ppb (3) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| April 20, 2021, 7 p.m. | 15.0 ppb (15) | 5.0 ppb (5) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| April 20, 2021, 6 p.m. | 18.0 ppb (17) | 6.0 ppb (6) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 20, 2021, 5 p.m. | 18.0 ppb (17) | 6.0 ppb (6) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| April 20, 2021, 4 p.m. | 22.0 ppb (21) | 8.0 ppb (8) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 20, 2021, 3 p.m. | 23.0 ppb (22) | 10.0 ppb (10) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 20, 2021, 2 p.m. | 27.0 ppb (26) | 11.0 ppb (11) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 20, 2021, 1 p.m. | 39.0 ppb (37) | 18.0 ppb (17) | N/A | 21.0 ppb (20) | N/A | N/A | N/A | 0.08 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 20, 2021, noon | 51.0 ppb (49) | 25.0 ppb (24) | N/A | 26.0 ppb (25) | N/A | N/A | N/A | 0.18 ppb (3) | N/A | 8.0 μg/m3 (34) | 49.0 | |
| April 20, 2021, 11 a.m. | 65.0 ppb (63) | 33.0 ppb (32) | N/A | 31.0 ppb (30) | N/A | N/A | N/A | 0.3 ppb (4) | N/A | 8.0 μg/m3 (34) | 63.0 | |
| April 20, 2021, 10 a.m. | 81.0 ppb (80) | 45.0 ppb (43) | N/A | 36.0 ppb (34) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 80.0 | |
| April 20, 2021, 9 a.m. | 47.0 ppb (45) | 18.0 ppb (17) | N/A | 29.0 ppb (28) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 10.0 μg/m3 (42) | 45.0 | |
| April 20, 2021, 8 a.m. | 35.0 ppb (34) | 10.0 ppb (10) | N/A | 25.0 ppb (24) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 20, 2021, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.09 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 20, 2021, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.07 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 20, 2021, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.06 ppb (2) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 20, 2021, 4 a.m. | 35.0 ppb (34) | 8.0 ppb (8) | N/A | 27.0 ppb (26) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 13.0 μg/m3 (53) | 53.0 | |
| April 20, 2021, 3 a.m. | 23.0 ppb (22) | 2.0 ppb (2) | N/A | 21.0 ppb (20) | N/A | N/A | N/A | 0.18 ppb (3) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| April 20, 2021, 2 a.m. | 27.0 ppb (26) | 3.0 ppb (3) | N/A | 24.0 ppb (23) | N/A | N/A | N/A | 0.2 ppb (3) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 20, 2021, 1 a.m. | 61.0 ppb (59) | 21.0 ppb (20) | N/A | 39.0 ppb (37) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 15.0 μg/m3 (58) | 59.0 | |
| April 20, 2021, midnight | 48.0 ppb (46) | 13.0 ppb (13) | N/A | 35.0 ppb (34) | N/A | N/A | N/A | 0.37 ppb (5) | N/A | 16.0 μg/m3 (60) | 60.0 | |
| April 19, 2021, 11 p.m. | 18.0 ppb (17) | 3.0 ppb (3) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.1 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| April 19, 2021, 10 p.m. | 8.0 ppb (8) | 1.0 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 19, 2021, 9 p.m. | 9.0 ppb (9) | 1.0 ppb (1) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 19, 2021, 8 p.m. | 5.0 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 19, 2021, 7 p.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 19, 2021, 6 p.m. | 6.0 ppb (6) | 1.0 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 19, 2021, 5 p.m. | 8.0 ppb (8) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 19, 2021, 4 p.m. | 11.0 ppb (11) | 3.0 ppb (3) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 19, 2021, 3 p.m. | 12.0 ppb (12) | 3.0 ppb (3) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 19, 2021, 2 p.m. | 21.0 ppb (20) | 9.0 ppb (9) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 19, 2021, 1 p.m. | 26.0 ppb (25) | 12.0 ppb (12) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.06 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 19, 2021, noon | 26.0 ppb (25) | 11.0 ppb (11) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.08 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 19, 2021, 11 a.m. | 67.0 ppb (65) | 40.0 ppb (38) | N/A | 27.0 ppb (26) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 11.0 μg/m3 (46) | 65.0 | |
| April 19, 2021, 10 a.m. | 59.0 ppb (57) | 32.0 ppb (31) | N/A | 27.0 ppb (26) | N/A | N/A | N/A | 0.37 ppb (5) | N/A | 8.0 μg/m3 (34) | 57.0 | |
| April 19, 2021, 9 a.m. | 49.0 ppb (47) | 21.0 ppb (20) | N/A | 28.0 ppb (27) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 8.0 μg/m3 (34) | 47.0 | |
| April 19, 2021, 8 a.m. | 44.0 ppb (42) | 17.0 ppb (17) | N/A | 27.0 ppb (26) | N/A | N/A | N/A | 0.12 ppb (2) | N/A | 9.0 μg/m3 (38) | 42.0 | |
| April 19, 2021, 7 a.m. | 43.0 ppb (41) | 14.0 ppb (14) | N/A | 29.0 ppb (28) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| April 19, 2021, 6 a.m. | 41.0 ppb (39) | 12.0 ppb (12) | N/A | 29.0 ppb (28) | N/A | N/A | N/A | 0.17 ppb (3) | N/A | 8.0 μg/m3 (34) | 39.0 | |
| April 19, 2021, 5 a.m. | 48.0 ppb (46) | 16.0 ppb (16) | N/A | 32.0 ppb (31) | N/A | N/A | N/A | 0.38 ppb (5) | N/A | 10.0 μg/m3 (42) | 46.0 | |
| April 19, 2021, 4 a.m. | 26.0 ppb (25) | 5.0 ppb (5) | N/A | 21.0 ppb (20) | N/A | N/A | N/A | 0.1 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 19, 2021, 3 a.m. | 17.0 ppb (17) | 3.0 ppb (3) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 19, 2021, 2 a.m. | 54.0 ppb (51) | 19.0 ppb (18) | N/A | 36.0 ppb (34) | N/A | N/A | N/A | 0.49 ppb (6) | N/A | 12.0 μg/m3 (50) | 51.0 | |
| April 19, 2021, 1 a.m. | 20.0 ppb (19) | 3.0 ppb (3) | N/A | 17.0 ppb (17) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| April 19, 2021, midnight | 10.0 ppb (10) | 1.0 ppb (1) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 18, 2021, 11 p.m. | 14.0 ppb (14) | 3.0 ppb (3) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 18, 2021, 10 p.m. | 11.0 ppb (11) | 3.0 ppb (3) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 18, 2021, 9 p.m. | 8.0 ppb (8) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 18, 2021, 8 p.m. | 10.0 ppb (10) | 4.0 ppb (4) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 18, 2021, 7 p.m. | 8.0 ppb (8) | 3.0 ppb (3) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 18, 2021, 6 p.m. | 10.0 ppb (10) | 4.0 ppb (4) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 18, 2021, 5 p.m. | 9.0 ppb (9) | 3.0 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 3.0 μg/m3 (13) | 13.0 | |
| April 18, 2021, 4 p.m. | 8.0 ppb (8) | 3.0 ppb (3) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.05 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 18, 2021, 3 p.m. | 8.0 ppb (8) | 3.0 ppb (3) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 18, 2021, 2 p.m. | 8.0 ppb (8) | 3.0 ppb (3) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 18, 2021, 1 p.m. | 11.0 ppb (11) | 4.0 ppb (4) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 18, 2021, noon | 12.0 ppb (12) | 4.0 ppb (4) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 18, 2021, 11 a.m. | 13.0 ppb (13) | 4.0 ppb (4) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | 0.06 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 18, 2021, 10 a.m. | 14.0 ppb (14) | 3.0 ppb (3) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | 0.08 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 18, 2021, 9 a.m. | 11.0 ppb (11) | 2.0 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 18, 2021, 8 a.m. | 12.0 ppb (12) | 1.0 ppb (1) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 18, 2021, 7 a.m. | 12.0 ppb (12) | 2.0 ppb (2) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 18, 2021, 6 a.m. | 9.0 ppb (9) | 1.0 ppb (1) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | 0.05 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 18, 2021, 5 a.m. | 13.0 ppb (13) | 2.0 ppb (2) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | 0.12 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 18, 2021, 4 a.m. | 17.0 ppb (17) | 4.0 ppb (4) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | 0.11 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 18, 2021, 3 a.m. | 28.0 ppb (27) | 9.0 ppb (9) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 18, 2021, 2 a.m. | 31.0 ppb (30) | 9.0 ppb (9) | N/A | 21.0 ppb (20) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 5.0 μg/m3 (21) | 30.0 | |
| April 18, 2021, 1 a.m. | 32.0 ppb (31) | 10.0 ppb (10) | N/A | 22.0 ppb (21) | N/A | N/A | N/A | 0.22 ppb (3) | N/A | 5.0 μg/m3 (21) | 31.0 | |
| April 18, 2021, midnight | 18.0 ppb (17) | 5.0 ppb (5) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 17, 2021, 11 p.m. | 17.0 ppb (17) | 4.0 ppb (4) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | 0.09 ppb (2) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 17, 2021, 10 p.m. | 18.0 ppb (17) | 5.0 ppb (5) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.12 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 17, 2021, 9 p.m. | 10.0 ppb (10) | 3.0 ppb (3) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 17, 2021, 8 p.m. | 13.0 ppb (13) | 4.0 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 17, 2021, 7 p.m. | 12.0 ppb (12) | 4.0 ppb (4) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| April 17, 2021, 6 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 | 1.0 μg/m3 (5) | 14.0 | |
| April 17, 2021, 5 p.m. | 17.0 ppb (17) | 7.0 ppb (7) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (5) | 17.0 | |
| April 17, 2021, 4 p.m. | 20.0 ppb (19) | 8.0 ppb (8) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 3.0 μg/m3 (13) | 19.0 | |
| April 17, 2021, 3 p.m. | 21.0 ppb (20) | 7.0 ppb (7) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 20.0 | |
| April 17, 2021, 2 p.m. | 20.0 ppb (19) | 7.0 ppb (7) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 19.0 | |
| April 17, 2021, 1 p.m. | 21.0 ppb (20) | 7.0 ppb (7) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 17, 2021, noon | 21.0 ppb (20) | 7.0 ppb (7) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 20.0 | |
| April 17, 2021, 11 a.m. | 22.0 ppb (21) | 6.0 ppb (6) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 21.0 | |
| April 17, 2021, 10 a.m. | 22.0 ppb (21) | 5.0 ppb (5) | N/A | 17.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 21.0 | |
| April 17, 2021, 9 a.m. | 26.0 ppb (25) | 5.0 ppb (5) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 25.0 | |
| April 17, 2021, 8 a.m. | 18.0 ppb (17) | 2.0 ppb (2) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (5) | 17.0 | |
| April 17, 2021, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| April 17, 2021, 6 a.m. | 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 | |
| April 17, 2021, 5 a.m. | 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 | |
| April 17, 2021, 4 a.m. | 17.0 ppb (17) | 3.0 ppb (3) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 17.0 | |
| April 17, 2021, 3 a.m. | 21.0 ppb (20) | 5.0 ppb (5) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 20.0 | |
| April 17, 2021, 2 a.m. | 16.0 ppb (16) | 3.0 ppb (3) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 17, 2021, 1 a.m. | 11.0 ppb (11) | 1.0 ppb (1) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| April 17, 2021, midnight | 15.0 ppb (15) | 3.0 ppb (3) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 16, 2021, 11 p.m. | 8.0 ppb (8) | 0.0 ppb (0) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| April 16, 2021, 10 p.m. | 13.0 ppb (13) | 1.0 ppb (1) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 16, 2021, 9 p.m. | 15.0 ppb (15) | 3.0 ppb (3) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 16, 2021, 8 p.m. | 7.0 ppb (7) | 0.0 ppb (0) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 16, 2021, 7 p.m. | 17.0 ppb (17) | 5.0 ppb (5) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 16, 2021, 6 p.m. | 26.0 ppb (25) | 10.0 ppb (10) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 5.0 μg/m3 (21) | 25.0 | |
| April 16, 2021, 5 p.m. | 35.0 ppb (34) | 15.0 ppb (15) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 3.0 μg/m3 (13) | 34.0 | |
| April 16, 2021, 4 p.m. | 35.0 ppb (34) | 13.0 ppb (13) | N/A | 21.0 ppb (20) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 4.0 μg/m3 (17) | 34.0 | |
| April 16, 2021, 3 p.m. | 52.0 ppb (50) | 22.0 ppb (21) | N/A | 30.0 ppb (29) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 50.0 | |
| April 16, 2021, 2 p.m. | 69.0 ppb (67) | 32.0 ppb (31) | N/A | 37.0 ppb (35) | N/A | N/A | N/A | 0.05 ppb (2) | N/A | 7.0 μg/m3 (30) | 67.0 | |
| April 16, 2021, 1 p.m. | 54.0 ppb (51) | 24.0 ppb (23) | N/A | 30.0 ppb (29) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 51.0 | |
| April 16, 2021, noon | 13.0 ppb (13) | 3.0 ppb (3) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 16, 2021, 11 a.m. | 7.0 ppb (7) | 0.0 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 16, 2021, 10 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 | 5.0 μg/m3 (21) | 21.0 | |
| April 16, 2021, 9 a.m. | 7.0 ppb (7) | 0.0 ppb (0) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 16, 2021, 8 a.m. | 7.0 ppb (7) | 0.0 ppb (0) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 16, 2021, 7 a.m. | 2.0 ppb (2) | -1.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 16, 2021, 6 a.m. | 1.0 ppb (1) | 0.0 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 16, 2021, 5 a.m. | 2.0 ppb (2) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 16, 2021, 4 a.m. | 5.0 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 16, 2021, 3 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 | 8.0 μg/m3 (34) | 34.0 | |
| April 16, 2021, 2 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 | 5.0 μg/m3 (21) | 21.0 | |
| April 16, 2021, 1 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 | 6.0 μg/m3 (25) | 25.0 | |
| April 16, 2021, midnight | 2.0 ppb (2) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 15, 2021, 11 p.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | -0.13 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 15, 2021, 10 p.m. | 2.0 ppb (2) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 15, 2021, 9 p.m. | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 15, 2021, 8 p.m. | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 15, 2021, 7 p.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 15, 2021, 6 p.m. | 2.0 ppb (2) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 15, 2021, 5 p.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 15, 2021, 4 p.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 15, 2021, 3 p.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 | 5.0 μg/m3 (21) | 21.0 | |
| April 15, 2021, 2 p.m. | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 15, 2021, 1 p.m. | 8.0 ppb (8) | 2.0 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 15, 2021, noon | 8.0 ppb (8) | 2.0 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 15, 2021, 11 a.m. | 12.0 ppb (12) | 4.0 ppb (4) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 15, 2021, 10 a.m. | 28.0 ppb (27) | 10.0 ppb (10) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 27.0 | |
| April 15, 2021, 9 a.m. | 20.0 ppb (19) | 7.0 ppb (7) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 15, 2021, 8 a.m. | 16.0 ppb (16) | 4.0 ppb (4) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 15, 2021, 7 a.m. | 15.0 ppb (15) | 4.0 ppb (4) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 15, 2021, 6 a.m. | 12.0 ppb (12) | 2.0 ppb (2) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| April 15, 2021, 5 a.m. | 11.0 ppb (11) | 2.0 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 15, 2021, 4 a.m. | 8.0 ppb (8) | 1.0 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 15, 2021, 3 a.m. | 10.0 ppb (10) | 1.0 ppb (1) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| April 15, 2021, 2 a.m. | 10.0 ppb (10) | 2.0 ppb (2) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 15, 2021, 1 a.m. | 8.0 ppb (8) | 1.0 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 15, 2021, midnight | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 14, 2021, 11 p.m. | 7.0 ppb (7) | 2.0 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 14, 2021, 10 p.m. | 2.0 ppb (2) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 14, 2021, 9 p.m. | 3.0 ppb (3) | 1.0 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 | |
| April 14, 2021, 8 p.m. | 2.0 ppb (2) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 14, 2021, 7 p.m. | 2.0 ppb (2) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 |