Boston (Kenmore) MA, US: 42.3489, -71.097702
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 7, 2021, 3 a.m. | 11.0 ppb (11) | 2.0 ppb (2) | N/A | 10.0 ppb (10) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 7, 2021, 2 a.m. | 9.0 ppb (9) | 2.0 ppb (2) | N/A | 7.0 ppb (7) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 7, 2021, 1 a.m. | 11.0 ppb (11) | 3.0 ppb (3) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 7, 2021, midnight | 10.0 ppb (10) | 2.0 ppb (2) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 6, 2021, 11 p.m. | 10.0 ppb (10) | 1.0 ppb (1) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 6, 2021, 10 p.m. | 8.0 ppb (8) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 6, 2021, 9 p.m. | 7.0 ppb (7) | 2.0 ppb (2) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 6, 2021, 8 p.m. | 5.0 ppb (5) | 2.0 ppb (2) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 6, 2021, 7 p.m. | 5.0 ppb (5) | 2.0 ppb (2) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 6, 2021, 6 p.m. | 5.0 ppb (5) | 2.0 ppb (2) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 6, 2021, 5 p.m. | 7.0 ppb (7) | 3.0 ppb (3) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 6, 2021, 4 p.m. | 6.0 ppb (6) | 3.0 ppb (3) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 6, 2021, 3 p.m. | 6.0 ppb (6) | 3.0 ppb (3) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 6, 2021, 2 p.m. | 7.0 ppb (7) | 3.0 ppb (3) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 6, 2021, 1 p.m. | 6.0 ppb (6) | 2.0 ppb (2) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 6, 2021, noon | 11.0 ppb (11) | 3.0 ppb (3) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 6, 2021, 11 a.m. | 16.0 ppb (16) | 2.0 ppb (2) | N/A | 14.0 ppb (14) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 6, 2021, 10 a.m. | 12.0 ppb (12) | 1.0 ppb (1) | N/A | 11.0 ppb (11) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 6, 2021, 9 a.m. | 6.0 ppb (6) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 6, 2021, 8 a.m. | 7.0 ppb (7) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 6, 2021, 7 a.m. | 9.0 ppb (9) | 1.0 ppb (1) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 6, 2021, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 6, 2021, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 6, 2021, 4 a.m. | N/A | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 6, 2021, 3 a.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 | 3.0 μg/m3 (13) | 13.0 | |
| March 6, 2021, 2 a.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 | 3.0 μg/m3 (13) | 13.0 | |
| March 6, 2021, 1 a.m. | 12.0 ppb (12) | 3.0 ppb (3) | N/A | 10.0 ppb (10) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 6, 2021, midnight | 12.0 ppb (12) | 2.0 ppb (2) | N/A | 10.0 ppb (10) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 5, 2021, 11 p.m. | 22.0 ppb (21) | 8.0 ppb (8) | N/A | 15.0 ppb (15) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 21.0 | |
| March 5, 2021, 10 p.m. | 18.0 ppb (17) | 6.0 ppb (6) | N/A | 12.0 ppb (12) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 17.0 | |
| March 5, 2021, 9 p.m. | 16.0 ppb (16) | 6.0 ppb (6) | N/A | 11.0 ppb (11) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 16.0 | |
| March 5, 2021, 8 p.m. | 13.0 ppb (13) | 5.0 ppb (5) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 5, 2021, 7 p.m. | 14.0 ppb (14) | 6.0 ppb (6) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 14.0 | |
| March 5, 2021, 6 p.m. | 12.0 ppb (12) | 5.0 ppb (5) | N/A | 7.0 ppb (7) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 5, 2021, 5 p.m. | 11.0 ppb (11) | 5.0 ppb (5) | N/A | 7.0 ppb (7) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 5, 2021, 4 p.m. | 13.0 ppb (13) | 6.0 ppb (6) | N/A | 7.0 ppb (7) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 5, 2021, 3 p.m. | 11.0 ppb (11) | 5.0 ppb (5) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 5, 2021, 2 p.m. | 13.0 ppb (13) | 5.0 ppb (5) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 5, 2021, 1 p.m. | 19.0 ppb (18) | 8.0 ppb (8) | N/A | 11.0 ppb (11) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 18.0 | |
| March 5, 2021, noon | 13.0 ppb (13) | 5.0 ppb (5) | N/A | 9.0 ppb (9) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 5, 2021, 11 a.m. | 9.0 ppb (9) | 3.0 ppb (3) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| March 5, 2021, 10 a.m. | 5.0 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| March 5, 2021, 9 a.m. | 2.0 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| March 5, 2021, 8 a.m. | 2.0 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| March 5, 2021, 7 a.m. | 2.0 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| March 5, 2021, 6 a.m. | 2.0 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| March 5, 2021, 5 a.m. | 3.0 ppb (3) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| March 5, 2021, 4 a.m. | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| March 5, 2021, 3 a.m. | 5.0 ppb (5) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| March 5, 2021, 2 a.m. | 6.0 ppb (6) | 2.0 ppb (2) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 5, 2021, 1 a.m. | 6.0 ppb (6) | 3.0 ppb (3) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 5, 2021, midnight | 6.0 ppb (6) | 2.0 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 4, 2021, 11 p.m. | 15.0 ppb (15) | 6.0 ppb (6) | N/A | 9.0 ppb (9) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 4, 2021, 10 p.m. | 13.0 ppb (13) | 5.0 ppb (5) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 4, 2021, 9 p.m. | 12.0 ppb (12) | 5.0 ppb (5) | N/A | 7.0 ppb (7) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 4, 2021, 8 p.m. | 11.0 ppb (11) | 5.0 ppb (5) | N/A | 7.0 ppb (7) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 4, 2021, 7 p.m. | 11.0 ppb (11) | 5.0 ppb (5) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 4, 2021, 6 p.m. | 13.0 ppb (13) | 6.0 ppb (6) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 4, 2021, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 4, 2021, 4 p.m. | 10.0 ppb (10) | 4.0 ppb (4) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 4, 2021, 3 p.m. | 11.0 ppb (11) | 5.0 ppb (5) | N/A | 7.0 ppb (7) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 4, 2021, 2 p.m. | 19.0 ppb (18) | 9.0 ppb (9) | N/A | 11.0 ppb (11) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| March 4, 2021, 1 p.m. | 23.0 ppb (22) | 9.0 ppb (9) | N/A | 13.0 ppb (13) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| March 4, 2021, noon | 34.0 ppb (33) | 15.0 ppb (15) | N/A | 20.0 ppb (19) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 4, 2021, 11 a.m. | 22.0 ppb (21) | 4.0 ppb (4) | N/A | 18.0 ppb (17) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 4, 2021, 10 a.m. | 20.0 ppb (19) | 4.0 ppb (4) | N/A | 16.0 ppb (16) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 4, 2021, 9 a.m. | 12.0 ppb (12) | 1.0 ppb (1) | N/A | 12.0 ppb (12) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 4, 2021, 8 a.m. | 11.0 ppb (11) | 1.0 ppb (1) | N/A | 11.0 ppb (11) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 4, 2021, 7 a.m. | 19.0 ppb (18) | 3.0 ppb (3) | N/A | 16.0 ppb (16) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | 18.0 | |
| March 4, 2021, 6 a.m. | 14.0 ppb (14) | 2.0 ppb (2) | N/A | 12.0 ppb (12) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | 14.0 | |
| March 4, 2021, 5 a.m. | 13.0 ppb (13) | 4.0 ppb (4) | N/A | 9.0 ppb (9) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | N/A | 13.0 | |
| March 4, 2021, 4 a.m. | N/A | 2.0 ppb (2) | N/A | 13.0 ppb (13) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 4, 2021, 3 a.m. | 20.0 ppb (19) | 3.0 ppb (3) | N/A | 16.0 ppb (16) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 4, 2021, 2 a.m. | 16.0 ppb (16) | 3.0 ppb (3) | N/A | 14.0 ppb (14) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 4, 2021, 1 a.m. | 14.0 ppb (14) | 2.0 ppb (2) | N/A | 12.0 ppb (12) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 4, 2021, midnight | 13.0 ppb (13) | 2.0 ppb (2) | N/A | 10.0 ppb (10) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 3, 2021, 11 p.m. | 24.0 ppb (23) | 6.0 ppb (6) | N/A | 18.0 ppb (17) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 3, 2021, 10 p.m. | 25.0 ppb (24) | 8.0 ppb (8) | N/A | 18.0 ppb (17) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 3, 2021, 9 p.m. | 22.0 ppb (21) | 6.0 ppb (6) | N/A | 16.0 ppb (16) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| March 3, 2021, 8 p.m. | 18.0 ppb (17) | 7.0 ppb (7) | N/A | 11.0 ppb (11) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| March 3, 2021, 7 p.m. | 19.0 ppb (18) | 7.0 ppb (7) | N/A | 12.0 ppb (12) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| March 3, 2021, 6 p.m. | 13.0 ppb (13) | 5.0 ppb (5) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| March 3, 2021, 5 p.m. | 17.0 ppb (17) | 8.0 ppb (8) | N/A | 10.0 ppb (10) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 3, 2021, 4 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 | 6.0 μg/m3 (25) | 25.0 | |
| March 3, 2021, 3 p.m. | 18.0 ppb (17) | 7.0 ppb (7) | N/A | 11.0 ppb (11) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 3, 2021, 2 p.m. | 29.0 ppb (28) | 11.0 ppb (11) | N/A | 17.0 ppb (17) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 5.0 μg/m3 (21) | 28.0 | |
| March 3, 2021, 1 p.m. | 30.0 ppb (29) | 11.0 ppb (11) | N/A | 19.0 ppb (18) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 5.0 μg/m3 (21) | 29.0 | |
| March 3, 2021, noon | 31.0 ppb (30) | 11.0 ppb (11) | N/A | 20.0 ppb (19) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 5.0 μg/m3 (21) | 30.0 | |
| March 3, 2021, 11 a.m. | 19.0 ppb (18) | 5.0 ppb (5) | N/A | 14.0 ppb (14) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 3, 2021, 10 a.m. | 14.0 ppb (14) | 3.0 ppb (3) | N/A | 11.0 ppb (11) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 3, 2021, 9 a.m. | 10.0 ppb (10) | 2.0 ppb (2) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 3, 2021, 8 a.m. | 9.0 ppb (9) | 1.0 ppb (1) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 3, 2021, 7 a.m. | 12.0 ppb (12) | 1.0 ppb (1) | N/A | 11.0 ppb (11) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 3, 2021, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 3, 2021, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 3, 2021, 4 a.m. | N/A | 2.0 ppb (2) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 3, 2021, 3 a.m. | 15.0 ppb (15) | 4.0 ppb (4) | N/A | 11.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (13) | 15.0 | |
| March 3, 2021, 2 a.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 | 3.0 μg/m3 (13) | 13.0 | |
| March 3, 2021, 1 a.m. | 8.0 ppb (8) | 2.0 ppb (2) | N/A | 7.0 ppb (7) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 3, 2021, midnight | 11.0 ppb (11) | 3.0 ppb (3) | N/A | 9.0 ppb (9) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 2, 2021, 11 p.m. | 16.0 ppb (16) | 4.0 ppb (4) | N/A | 12.0 ppb (12) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 16.0 | |
| March 2, 2021, 10 p.m. | 14.0 ppb (14) | 5.0 ppb (5) | N/A | 10.0 ppb (10) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 14.0 | |
| March 2, 2021, 9 p.m. | 13.0 ppb (13) | 6.0 ppb (6) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 2, 2021, 8 p.m. | 10.0 ppb (10) | 4.0 ppb (4) | N/A | 7.0 ppb (7) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 2, 2021, 7 p.m. | 11.0 ppb (11) | 5.0 ppb (5) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 2, 2021, 6 p.m. | 8.0 ppb (8) | 4.0 ppb (4) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 2, 2021, 5 p.m. | 11.0 ppb (11) | 7.0 ppb (7) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 2, 2021, 4 p.m. | 10.0 ppb (10) | 5.0 ppb (5) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 2, 2021, 3 p.m. | 8.0 ppb (8) | 4.0 ppb (4) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 2, 2021, 2 p.m. | 14.0 ppb (14) | 7.0 ppb (7) | N/A | 7.0 ppb (7) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 2, 2021, 1 p.m. | 11.0 ppb (11) | 5.0 ppb (5) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 2, 2021, noon | 8.0 ppb (8) | 3.0 ppb (3) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 2, 2021, 11 a.m. | 8.0 ppb (8) | 3.0 ppb (3) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 2, 2021, 10 a.m. | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 2, 2021, 9 a.m. | 4.0 ppb (4) | 2.0 ppb (2) | N/A | 2.0 ppb (2) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 2, 2021, 8 a.m. | 2.0 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 2, 2021, 7 a.m. | 2.0 ppb (2) | 1.0 ppb (1) | N/A | 1.0 ppb (1) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 2, 2021, 6 a.m. | 2.0 ppb (2) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| March 2, 2021, 5 a.m. | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| March 2, 2021, 4 a.m. | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 2, 2021, 3 a.m. | 5.0 ppb (5) | 2.0 ppb (2) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| March 2, 2021, 2 a.m. | 5.0 ppb (5) | 2.0 ppb (2) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 2.0 μg/m3 (9) | 9.0 | |
| March 2, 2021, 1 a.m. | 6.0 ppb (6) | 2.0 ppb (2) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 13.0 | |
| March 2, 2021, midnight | 7.0 ppb (7) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 1, 2021, 11 p.m. | 12.0 ppb (12) | 4.0 ppb (4) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 1, 2021, 10 p.m. | 16.0 ppb (16) | 6.0 ppb (6) | N/A | 10.0 ppb (10) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 3.0 μg/m3 (13) | 16.0 | |
| March 1, 2021, 9 p.m. | 16.0 ppb (16) | 5.0 ppb (5) | N/A | 10.0 ppb (10) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 1, 2021, 8 p.m. | 21.0 ppb (20) | 8.0 ppb (8) | N/A | 13.0 ppb (13) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 1, 2021, 7 p.m. | 25.0 ppb (24) | 9.0 ppb (9) | N/A | 17.0 ppb (17) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 5.0 μg/m3 (21) | 24.0 | |
| March 1, 2021, 6 p.m. | 38.0 ppb (36) | 15.0 ppb (15) | N/A | 23.0 ppb (22) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 36.0 | |
| March 1, 2021, 5 p.m. | 32.0 ppb (31) | 9.0 ppb (9) | N/A | 23.0 ppb (22) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 31.0 | |
| March 1, 2021, 4 p.m. | 27.0 ppb (26) | 7.0 ppb (7) | N/A | 19.0 ppb (18) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 5.0 μg/m3 (21) | 26.0 | |
| March 1, 2021, 3 p.m. | 31.0 ppb (30) | 9.0 ppb (9) | N/A | 22.0 ppb (21) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 30.0 | |
| March 1, 2021, 2 p.m. | 44.0 ppb (42) | 15.0 ppb (15) | N/A | 29.0 ppb (28) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 8.0 μg/m3 (34) | 42.0 | |
| March 1, 2021, 1 p.m. | 65.0 ppb (63) | 27.0 ppb (26) | N/A | 37.0 ppb (35) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 11.0 μg/m3 (46) | 63.0 | |
| March 1, 2021, noon | 73.0 ppb (72) | 29.0 ppb (28) | N/A | 44.0 ppb (42) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 12.0 μg/m3 (50) | 72.0 | |
| March 1, 2021, 11 a.m. | 25.0 ppb (24) | 4.0 ppb (4) | N/A | 21.0 ppb (20) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| March 1, 2021, 10 a.m. | 17.0 ppb (17) | 2.0 ppb (2) | N/A | 15.0 ppb (15) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 1, 2021, 9 a.m. | 10.0 ppb (10) | 1.0 ppb (1) | N/A | 9.0 ppb (9) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 1, 2021, 8 a.m. | 7.0 ppb (7) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 1, 2021, 7 a.m. | 5.0 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 1, 2021, 6 a.m. | 9.0 ppb (9) | 1.0 ppb (1) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 1, 2021, 5 a.m. | 13.0 ppb (13) | 1.0 ppb (1) | N/A | 12.0 ppb (12) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 1, 2021, 4 a.m. | N/A | 2.0 ppb (2) | N/A | 13.0 ppb (13) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 1, 2021, 3 a.m. | 11.0 ppb (11) | 2.0 ppb (2) | N/A | 9.0 ppb (9) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 1, 2021, 2 a.m. | 16.0 ppb (16) | 3.0 ppb (3) | N/A | 13.0 ppb (13) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 1, 2021, 1 a.m. | 16.0 ppb (16) | 2.0 ppb (2) | N/A | 13.0 ppb (13) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 1, 2021, midnight | 15.0 ppb (15) | 3.0 ppb (3) | N/A | 12.0 ppb (12) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Feb. 28, 2021, 11 p.m. | 16.0 ppb (16) | 3.0 ppb (3) | N/A | 13.0 ppb (13) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Feb. 28, 2021, 10 p.m. | 15.0 ppb (15) | 2.0 ppb (2) | N/A | 13.0 ppb (13) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Feb. 28, 2021, 9 p.m. | 18.0 ppb (17) | 3.0 ppb (3) | N/A | 15.0 ppb (15) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Feb. 28, 2021, 8 p.m. | 15.0 ppb (15) | 3.0 ppb (3) | N/A | 13.0 ppb (13) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Feb. 28, 2021, 7 p.m. | 8.0 ppb (8) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| Feb. 28, 2021, 6 p.m. | 8.0 ppb (8) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 8.0 μg/m3 (34) | 34.0 | |
| Feb. 28, 2021, 5 p.m. | 7.0 ppb (7) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Feb. 28, 2021, 4 p.m. | 7.0 ppb (7) | 2.0 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Feb. 28, 2021, 3 p.m. | 10.0 ppb (10) | 2.0 ppb (2) | N/A | 8.0 ppb (8) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Feb. 28, 2021, 2 p.m. | 15.0 ppb (15) | 3.0 ppb (3) | N/A | 12.0 ppb (12) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Feb. 28, 2021, 1 p.m. | 19.0 ppb (18) | 3.0 ppb (3) | N/A | 16.0 ppb (16) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Feb. 28, 2021, noon | 18.0 ppb (17) | 2.0 ppb (2) | N/A | 16.0 ppb (16) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Feb. 28, 2021, 11 a.m. | 26.0 ppb (25) | 2.0 ppb (2) | N/A | 24.0 ppb (23) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 7.0 μg/m3 (30) | 30.0 | |
| Feb. 28, 2021, 10 a.m. | 28.0 ppb (27) | 1.0 ppb (1) | N/A | 27.0 ppb (26) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 27.0 | |
| Feb. 28, 2021, 9 a.m. | 20.0 ppb (19) | 1.0 ppb (1) | N/A | 19.0 ppb (18) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Feb. 28, 2021, 8 a.m. | 11.0 ppb (11) | 0.0 ppb (0) | N/A | 10.0 ppb (10) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Feb. 28, 2021, 7 a.m. | 8.0 ppb (8) | 0.0 ppb (0) | N/A | 7.0 ppb (7) | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Feb. 28, 2021, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Feb. 28, 2021, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Feb. 28, 2021, 4 a.m. | N/A | 2.0 ppb (2) | N/A | 13.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 |