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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. 25, 2021, 2 a.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 | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 25, 2021, 1 a.m. | 10.0 ppb (10) | 2.0 ppb (2) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 25, 2021, midnight | 10.0 ppb (10) | 2.0 ppb (2) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 3.0 μg/m3 (13) | 13.0 | |
| Jan. 24, 2021, 11 p.m. | 11.0 ppb (11) | 3.0 ppb (3) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 24, 2021, 10 p.m. | 11.0 ppb (11) | 3.0 ppb (3) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 2.0 μg/m3 (9) | 11.0 | |
| Jan. 24, 2021, 9 p.m. | 11.0 ppb (11) | 3.0 ppb (3) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 1.0 μg/m3 (5) | 11.0 | |
| Jan. 24, 2021, 8 p.m. | 8.0 ppb (8) | 3.0 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 24, 2021, 7 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 | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 24, 2021, 6 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 | 3.0 μg/m3 (13) | 13.0 | |
| Jan. 24, 2021, 5 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 | |
| Jan. 24, 2021, 4 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 | |
| Jan. 24, 2021, 3 p.m. | 9.0 ppb (9) | 3.0 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 24, 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 | 7.0 μg/m3 (30) | 30.0 | |
| Jan. 24, 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 | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 24, 2021, noon | 10.0 ppb (10) | 2.0 ppb (2) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| Jan. 24, 2021, 11 a.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 | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 24, 2021, 10 a.m. | 9.0 ppb (9) | 2.0 ppb (2) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 24, 2021, 9 a.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 | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 24, 2021, 8 a.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 | 7.0 μg/m3 (30) | 30.0 | |
| Jan. 24, 2021, 7 a.m. | 7.0 ppb (7) | 1.0 ppb (1) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 24, 2021, 6 a.m. | 7.0 ppb (7) | 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 | |
| Jan. 24, 2021, 5 a.m. | 9.0 ppb (9) | 2.0 ppb (2) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 24, 2021, 4 a.m. | 10.0 ppb (10) | 3.0 ppb (3) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | 0.05 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 24, 2021, 3 a.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 | 3.0 μg/m3 (13) | 13.0 | |
| Jan. 24, 2021, 2 a.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 | 3.0 μg/m3 (13) | 13.0 | |
| Jan. 24, 2021, 1 a.m. | 9.0 ppb (9) | 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 | |
| Jan. 24, 2021, midnight | 10.0 ppb (10) | 3.0 ppb (3) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 23, 2021, 11 p.m. | 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 | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 23, 2021, 10 p.m. | 12.0 ppb (12) | 4.0 ppb (4) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 23, 2021, 9 p.m. | 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 | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 23, 2021, 8 p.m. | 13.0 ppb (13) | 6.0 ppb (6) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 23, 2021, 7 p.m. | 12.0 ppb (12) | 5.0 ppb (5) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 0.0 μg/m3 (0) | 12.0 | |
| Jan. 23, 2021, 6 p.m. | 12.0 ppb (12) | 5.0 ppb (5) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 23, 2021, 5 p.m. | 12.0 ppb (12) | 5.0 ppb (5) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Jan. 23, 2021, 4 p.m. | 11.0 ppb (11) | 5.0 ppb (5) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 23, 2021, 3 p.m. | 12.0 ppb (12) | 5.0 ppb (5) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 3.0 μg/m3 (13) | 13.0 | |
| Jan. 23, 2021, 2 p.m. | 13.0 ppb (13) | 6.0 ppb (6) | N/A | 7.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| Jan. 23, 2021, 1 p.m. | 14.0 ppb (14) | 6.0 ppb (6) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 23, 2021, noon | 18.0 ppb (17) | 6.0 ppb (6) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| Jan. 23, 2021, 11 a.m. | 17.0 ppb (17) | 5.0 ppb (5) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 23, 2021, 10 a.m. | 15.0 ppb (15) | 5.0 ppb (5) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Jan. 23, 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 | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 23, 2021, 8 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 | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 23, 2021, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 23, 2021, 6 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 | |
| Jan. 23, 2021, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 3.0 μg/m3 (13) | 13.0 | |
| Jan. 23, 2021, 4 a.m. | 17.0 ppb (17) | 3.0 ppb (3) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | 0.12 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 23, 2021, 3 a.m. | 29.0 ppb (28) | 8.0 ppb (8) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 23, 2021, 2 a.m. | 21.0 ppb (20) | 6.0 ppb (6) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 23, 2021, 1 a.m. | 18.0 ppb (17) | 5.0 ppb (5) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 23, 2021, midnight | 17.0 ppb (17) | 4.0 ppb (4) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.1 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 22, 2021, 11 p.m. | 22.0 ppb (21) | 7.0 ppb (7) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| Jan. 22, 2021, 10 p.m. | 28.0 ppb (27) | 9.0 ppb (9) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.18 ppb (3) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Jan. 22, 2021, 9 p.m. | 26.0 ppb (25) | 9.0 ppb (9) | N/A | 17.0 ppb (17) | N/A | N/A | N/A | 0.13 ppb (2) | N/A | 1.0 μg/m3 (5) | 25.0 | |
| Jan. 22, 2021, 8 p.m. | 27.0 ppb (26) | 11.0 ppb (11) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.11 ppb (2) | N/A | 5.0 μg/m3 (21) | 26.0 | |
| Jan. 22, 2021, 7 p.m. | 28.0 ppb (27) | 12.0 ppb (12) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | 0.1 ppb (2) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Jan. 22, 2021, 6 p.m. | 27.0 ppb (26) | 12.0 ppb (12) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.09 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Jan. 22, 2021, 5 p.m. | 30.0 ppb (29) | 16.0 ppb (16) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.13 ppb (2) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| Jan. 22, 2021, 4 p.m. | 40.0 ppb (38) | 22.0 ppb (21) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| Jan. 22, 2021, 3 p.m. | 46.0 ppb (44) | 26.0 ppb (25) | N/A | 21.0 ppb (20) | N/A | N/A | N/A | 0.18 ppb (3) | N/A | 14.0 μg/m3 (55) | 55.0 | |
| Jan. 22, 2021, 2 p.m. | 74.0 ppb (73) | 47.0 ppb (45) | N/A | 27.0 ppb (26) | N/A | N/A | N/A | 0.33 ppb (4) | N/A | 19.0 μg/m3 (66) | 73.0 | |
| Jan. 22, 2021, 1 p.m. | 91.0 ppb (91) | 59.0 ppb (57) | N/A | 32.0 ppb (31) | N/A | N/A | N/A | 0.4 ppb (5) | N/A | 17.0 μg/m3 (62) | 91.0 | |
| Jan. 22, 2021, noon | 122.0 ppb (105) | 87.0 ppb (87) | N/A | 35.0 ppb (34) | N/A | N/A | N/A | 0.6 ppb (7) | N/A | 16.0 μg/m3 (60) | 105.0 | |
| Jan. 22, 2021, 11 a.m. | 113.0 ppb (104) | 78.0 ppb (77) | N/A | 35.0 ppb (34) | N/A | N/A | N/A | 0.51 ppb (6) | N/A | 21.0 μg/m3 (70) | 104.0 | |
| Jan. 22, 2021, 10 a.m. | 54.0 ppb (51) | 25.0 ppb (24) | N/A | 28.0 ppb (27) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 16.0 μg/m3 (60) | 60.0 | |
| Jan. 22, 2021, 9 a.m. | 43.0 ppb (41) | 15.0 ppb (15) | N/A | 28.0 ppb (27) | N/A | N/A | N/A | 0.17 ppb (3) | N/A | 16.0 μg/m3 (60) | 60.0 | |
| Jan. 22, 2021, 8 a.m. | 38.0 ppb (36) | 12.0 ppb (12) | N/A | 26.0 ppb (25) | N/A | N/A | N/A | 0.11 ppb (2) | N/A | 14.0 μg/m3 (55) | 55.0 | |
| Jan. 22, 2021, 7 a.m. | 29.0 ppb (28) | 6.0 ppb (6) | N/A | 23.0 ppb (22) | N/A | N/A | N/A | 0.11 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Jan. 22, 2021, 6 a.m. | 32.0 ppb (31) | 6.0 ppb (6) | N/A | 25.0 ppb (24) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| Jan. 22, 2021, 5 a.m. | 32.0 ppb (31) | 6.0 ppb (6) | N/A | 26.0 ppb (25) | N/A | N/A | N/A | 0.17 ppb (3) | N/A | 13.0 μg/m3 (53) | 53.0 | |
| Jan. 22, 2021, 4 a.m. | 36.0 ppb (34) | 9.0 ppb (9) | N/A | 27.0 ppb (26) | N/A | N/A | N/A | 0.28 ppb (4) | N/A | 16.0 μg/m3 (60) | 60.0 | |
| Jan. 22, 2021, 3 a.m. | 43.0 ppb (41) | 13.0 ppb (13) | N/A | 31.0 ppb (30) | N/A | N/A | N/A | 0.36 ppb (5) | N/A | 17.0 μg/m3 (62) | 62.0 | |
| Jan. 22, 2021, 2 a.m. | 51.0 ppb (49) | 18.0 ppb (17) | N/A | 33.0 ppb (32) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | 14.0 μg/m3 (55) | 55.0 | |
| Jan. 22, 2021, 1 a.m. | 87.0 ppb (87) | 50.0 ppb (48) | N/A | 37.0 ppb (35) | N/A | N/A | N/A | 0.63 ppb (7) | N/A | 15.0 μg/m3 (58) | 87.0 | |
| Jan. 22, 2021, midnight | 79.0 ppb (78) | 42.0 ppb (40) | N/A | 36.0 ppb (34) | N/A | N/A | N/A | 0.55 ppb (7) | N/A | 12.0 μg/m3 (50) | 78.0 | |
| Jan. 21, 2021, 11 p.m. | 60.0 ppb (58) | 26.0 ppb (25) | N/A | 34.0 ppb (33) | N/A | N/A | N/A | 0.42 ppb (5) | N/A | 12.0 μg/m3 (50) | 58.0 | |
| Jan. 21, 2021, 10 p.m. | 54.0 ppb (51) | 22.0 ppb (21) | N/A | 32.0 ppb (31) | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 12.0 μg/m3 (50) | 51.0 | |
| Jan. 21, 2021, 9 p.m. | 50.0 ppb (48) | 20.0 ppb (19) | N/A | 30.0 ppb (29) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 13.0 μg/m3 (53) | 53.0 | |
| Jan. 21, 2021, 8 p.m. | 45.0 ppb (43) | 19.0 ppb (18) | N/A | 26.0 ppb (25) | N/A | N/A | N/A | 0.21 ppb (3) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| Jan. 21, 2021, 7 p.m. | 41.0 ppb (39) | 19.0 ppb (18) | N/A | 22.0 ppb (21) | N/A | N/A | N/A | 0.16 ppb (3) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 21, 2021, 6 p.m. | 40.0 ppb (38) | 19.0 ppb (18) | N/A | 21.0 ppb (20) | N/A | N/A | N/A | 0.1 ppb (2) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 21, 2021, 5 p.m. | 32.0 ppb (31) | 15.0 ppb (15) | N/A | 17.0 ppb (17) | N/A | N/A | N/A | 0.1 ppb (2) | N/A | N/A | 31.0 | |
| Jan. 21, 2021, 4 p.m. | 36.0 ppb (34) | 17.0 ppb (17) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.08 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 21, 2021, 3 p.m. | 41.0 ppb (39) | 19.0 ppb (18) | N/A | 21.0 ppb (20) | N/A | N/A | N/A | 0.12 ppb (2) | N/A | N/A | 39.0 | |
| Jan. 21, 2021, 2 p.m. | 53.0 ppb (50) | 27.0 ppb (26) | N/A | 26.0 ppb (25) | N/A | N/A | N/A | 0.1 ppb (2) | N/A | 7.0 μg/m3 (30) | 50.0 | |
| Jan. 21, 2021, 1 p.m. | 59.0 ppb (57) | 31.0 ppb (30) | N/A | 28.0 ppb (27) | N/A | N/A | N/A | 0.19 ppb (3) | N/A | 6.0 μg/m3 (25) | 57.0 | |
| Jan. 21, 2021, noon | 66.0 ppb (64) | 36.0 ppb (34) | N/A | 29.0 ppb (28) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 6.0 μg/m3 (25) | 64.0 | |
| Jan. 21, 2021, 11 a.m. | 63.0 ppb (61) | 34.0 ppb (33) | N/A | 29.0 ppb (28) | N/A | N/A | N/A | 0.18 ppb (3) | N/A | 6.0 μg/m3 (25) | 61.0 | |
| Jan. 21, 2021, 10 a.m. | 35.0 ppb (34) | 16.0 ppb (16) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.06 ppb (2) | N/A | 6.0 μg/m3 (25) | 34.0 | |
| Jan. 21, 2021, 9 a.m. | 25.0 ppb (24) | 8.0 ppb (8) | N/A | 17.0 ppb (17) | N/A | N/A | N/A | 0.05 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 21, 2021, 8 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 | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 21, 2021, 7 a.m. | 11.0 ppb (11) | 1.0 ppb (1) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 21, 2021, 6 a.m. | 11.0 ppb (11) | 1.0 ppb (1) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 21, 2021, 5 a.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 | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 21, 2021, 4 a.m. | 10.0 ppb (10) | 2.0 ppb (2) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 2.0 μg/m3 (9) | 10.0 | |
| Jan. 21, 2021, 3 a.m. | 15.0 ppb (15) | 3.0 ppb (3) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 2.0 μg/m3 (9) | 15.0 | |
| Jan. 21, 2021, 2 a.m. | 11.0 ppb (11) | 2.0 ppb (2) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 2.0 μg/m3 (9) | 11.0 | |
| Jan. 21, 2021, 1 a.m. | 16.0 ppb (16) | 4.0 ppb (4) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 2.0 μg/m3 (9) | 16.0 | |
| Jan. 21, 2021, midnight | 16.0 ppb (16) | 4.0 ppb (4) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.1 ppb (2) | N/A | 3.0 μg/m3 (13) | 16.0 | |
| Jan. 20, 2021, 11 p.m. | 20.0 ppb (19) | 5.0 ppb (5) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.11 ppb (2) | N/A | 4.0 μg/m3 (17) | 19.0 | |
| Jan. 20, 2021, 10 p.m. | 20.0 ppb (19) | 6.0 ppb (6) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.12 ppb (2) | N/A | 3.0 μg/m3 (13) | 19.0 | |
| Jan. 20, 2021, 9 p.m. | 18.0 ppb (17) | 6.0 ppb (6) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.05 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 20, 2021, 8 p.m. | 21.0 ppb (20) | 8.0 ppb (8) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.05 ppb (2) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| Jan. 20, 2021, 7 p.m. | 21.0 ppb (20) | 9.0 ppb (9) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.07 ppb (2) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| Jan. 20, 2021, 6 p.m. | 28.0 ppb (27) | 14.0 ppb (14) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.08 ppb (2) | N/A | 15.0 μg/m3 (58) | 58.0 | |
| Jan. 20, 2021, 5 p.m. | 31.0 ppb (30) | 16.0 ppb (16) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.08 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Jan. 20, 2021, 4 p.m. | 39.0 ppb (37) | 20.0 ppb (19) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.13 ppb (2) | N/A | 14.0 μg/m3 (55) | 55.0 | |
| Jan. 20, 2021, 3 p.m. | 48.0 ppb (46) | 26.0 ppb (25) | N/A | 22.0 ppb (21) | N/A | N/A | N/A | 0.19 ppb (3) | N/A | 9.0 μg/m3 (38) | 46.0 | |
| Jan. 20, 2021, 2 p.m. | 63.0 ppb (61) | 37.0 ppb (35) | N/A | 27.0 ppb (26) | N/A | N/A | N/A | 0.26 ppb (4) | N/A | 12.0 μg/m3 (50) | 61.0 | |
| Jan. 20, 2021, 1 p.m. | 67.0 ppb (65) | 37.0 ppb (35) | N/A | 29.0 ppb (28) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 17.0 μg/m3 (62) | 65.0 | |
| Jan. 20, 2021, noon | 87.0 ppb (87) | 53.0 ppb (50) | N/A | 33.0 ppb (32) | N/A | N/A | N/A | 0.4 ppb (5) | N/A | 14.0 μg/m3 (55) | 87.0 | |
| Jan. 20, 2021, 11 a.m. | 65.0 ppb (63) | 35.0 ppb (34) | N/A | 30.0 ppb (29) | N/A | N/A | N/A | 0.39 ppb (5) | N/A | 17.0 μg/m3 (62) | 63.0 | |
| Jan. 20, 2021, 10 a.m. | 43.0 ppb (41) | 19.0 ppb (18) | N/A | 24.0 ppb (23) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (53) | 53.0 | |
| Jan. 20, 2021, 9 a.m. | 29.0 ppb (28) | 11.0 ppb (11) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.07 ppb (2) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Jan. 20, 2021, 8 a.m. | 22.0 ppb (21) | 6.0 ppb (6) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 20, 2021, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Jan. 20, 2021, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 20, 2021, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.09 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 20, 2021, 4 a.m. | 18.0 ppb (17) | 4.0 ppb (4) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.13 ppb (2) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| Jan. 20, 2021, 3 a.m. | 20.0 ppb (19) | 6.0 ppb (6) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.17 ppb (3) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| Jan. 20, 2021, 2 a.m. | 20.0 ppb (19) | 5.0 ppb (5) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.13 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 20, 2021, 1 a.m. | 22.0 ppb (21) | 7.0 ppb (7) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.16 ppb (3) | N/A | 4.0 μg/m3 (17) | 21.0 | |
| Jan. 20, 2021, midnight | 16.0 ppb (16) | 5.0 ppb (5) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.13 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 19, 2021, 11 p.m. | 20.0 ppb (19) | 7.0 ppb (7) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 19, 2021, 10 p.m. | 18.0 ppb (17) | 6.0 ppb (6) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.09 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 19, 2021, 9 p.m. | 25.0 ppb (24) | 10.0 ppb (10) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | 0.17 ppb (3) | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Jan. 19, 2021, 8 p.m. | 25.0 ppb (24) | 10.0 ppb (10) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.13 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 19, 2021, 7 p.m. | 27.0 ppb (26) | 12.0 ppb (12) | N/A | 15.0 ppb (15) | N/A | N/A | N/A | 0.12 ppb (2) | N/A | 4.0 μg/m3 (17) | 26.0 | |
| Jan. 19, 2021, 6 p.m. | 25.0 ppb (24) | 11.0 ppb (11) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.12 ppb (2) | N/A | 4.0 μg/m3 (17) | 24.0 | |
| Jan. 19, 2021, 5 p.m. | 25.0 ppb (24) | 12.0 ppb (12) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | 0.07 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 19, 2021, 4 p.m. | 28.0 ppb (27) | 14.0 ppb (14) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.07 ppb (2) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| Jan. 19, 2021, 3 p.m. | 34.0 ppb (33) | 17.0 ppb (17) | N/A | 17.0 ppb (17) | N/A | N/A | N/A | 0.07 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Jan. 19, 2021, 2 p.m. | 37.0 ppb (35) | 18.0 ppb (17) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.08 ppb (2) | N/A | 7.0 μg/m3 (30) | 35.0 | |
| Jan. 19, 2021, 1 p.m. | 49.0 ppb (47) | 25.0 ppb (24) | N/A | 24.0 ppb (23) | N/A | N/A | N/A | 0.11 ppb (2) | N/A | 9.0 μg/m3 (38) | 47.0 | |
| Jan. 19, 2021, noon | 56.0 ppb (54) | 29.0 ppb (28) | N/A | 27.0 ppb (26) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 5.0 μg/m3 (21) | 54.0 | |
| Jan. 19, 2021, 11 a.m. | 48.0 ppb (46) | 25.0 ppb (24) | N/A | 23.0 ppb (22) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 5.0 μg/m3 (21) | 46.0 | |
| Jan. 19, 2021, 10 a.m. | 36.0 ppb (34) | 16.0 ppb (16) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.07 ppb (2) | N/A | 7.0 μg/m3 (30) | 34.0 | |
| Jan. 19, 2021, 9 a.m. | 19.0 ppb (18) | 5.0 ppb (5) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Jan. 19, 2021, 8 a.m. | 13.0 ppb (13) | 3.0 ppb (3) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 19, 2021, 7 a.m. | 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 | |
| Jan. 19, 2021, 6 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 | 7.0 μg/m3 (30) | 30.0 | |
| Jan. 19, 2021, 5 a.m. | 11.0 ppb (11) | 1.0 ppb (1) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Jan. 19, 2021, 4 a.m. | 11.0 ppb (11) | 2.0 ppb (2) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| Jan. 19, 2021, 3 a.m. | 13.0 ppb (13) | 3.0 ppb (3) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | 0.09 ppb (2) | N/A | 1.0 μg/m3 (5) | 13.0 | |
| Jan. 19, 2021, 2 a.m. | 14.0 ppb (14) | 4.0 ppb (4) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 0.0 μg/m3 (0) | 14.0 | |
| Jan. 19, 2021, 1 a.m. | 14.0 ppb (14) | 4.0 ppb (4) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | 0.06 ppb (2) | N/A | 1.0 μg/m3 (5) | 14.0 | |
| Jan. 19, 2021, midnight | 14.0 ppb (14) | 4.0 ppb (4) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | 0.06 ppb (2) | N/A | 1.0 μg/m3 (5) | 14.0 | |
| Jan. 18, 2021, 11 p.m. | 11.0 ppb (11) | 3.0 ppb (3) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 18, 2021, 10 p.m. | 14.0 ppb (14) | 4.0 ppb (4) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 18, 2021, 9 p.m. | 17.0 ppb (17) | 6.0 ppb (6) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 18, 2021, 8 p.m. | 15.0 ppb (15) | 6.0 ppb (6) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 3.0 μg/m3 (13) | 15.0 | |
| Jan. 18, 2021, 7 p.m. | 22.0 ppb (21) | 10.0 ppb (10) | N/A | 12.0 ppb (12) | N/A | N/A | N/A | 0.05 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 18, 2021, 6 p.m. | 21.0 ppb (20) | 10.0 ppb (10) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | 0.05 ppb (2) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| Jan. 18, 2021, 5 p.m. | 19.0 ppb (18) | 9.0 ppb (9) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 18, 2021, 4 p.m. | 16.0 ppb (16) | 8.0 ppb (8) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| Jan. 18, 2021, 3 p.m. | 22.0 ppb (21) | 12.0 ppb (12) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | 0.05 ppb (2) | N/A | 4.0 μg/m3 (17) | 21.0 | |
| Jan. 18, 2021, 2 p.m. | 29.0 ppb (28) | 15.0 ppb (15) | N/A | 14.0 ppb (14) | N/A | N/A | N/A | 0.08 ppb (2) | N/A | 8.0 μg/m3 (34) | 34.0 | |
| Jan. 18, 2021, 1 p.m. | 31.0 ppb (30) | 16.0 ppb (16) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | 0.09 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 18, 2021, noon | 34.0 ppb (33) | 15.0 ppb (15) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 7.0 μg/m3 (30) | 33.0 | |
| Jan. 18, 2021, 11 a.m. | 28.0 ppb (27) | 12.0 ppb (12) | N/A | 16.0 ppb (16) | N/A | N/A | N/A | 0.08 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 18, 2021, 10 a.m. | 20.0 ppb (19) | 7.0 ppb (7) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 18, 2021, 9 a.m. | 16.0 ppb (16) | 5.0 ppb (5) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 18, 2021, 8 a.m. | 13.0 ppb (13) | 3.0 ppb (3) | N/A | 10.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 18, 2021, 7 a.m. | 10.0 ppb (10) | 2.0 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 | |
| Jan. 18, 2021, 6 a.m. | 9.0 ppb (9) | 2.0 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 | |
| Jan. 18, 2021, 5 a.m. | 10.0 ppb (10) | 2.0 ppb (2) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 18, 2021, 4 a.m. | 11.0 ppb (11) | 2.0 ppb (2) | N/A | 9.0 ppb (9) | N/A | N/A | N/A | 0.06 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 18, 2021, 3 a.m. | 11.0 ppb (11) | 3.0 ppb (3) | N/A | 8.0 ppb (8) | N/A | N/A | N/A | 0.09 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 |