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 4, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| April 4, 2020, 4 a.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 4, 2020, 3 a.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 4, 2020, 2 a.m. | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 4, 2020, 1 a.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 4, 2020, midnight | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 0.0 μg/m3 (0) | 4.0 | |
| April 3, 2020, 11 p.m. | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 0.0 μg/m3 (0) | 4.0 | |
| April 3, 2020, 10 p.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 0.0 μg/m3 (0) | 4.0 | |
| April 3, 2020, 9 p.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| April 3, 2020, 8 p.m. | 5.0 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 3, 2020, 7 p.m. | 5.0 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 3, 2020, 6 p.m. | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| April 3, 2020, 5 p.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| April 3, 2020, 4 p.m. | 5.0 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 1.0 μg/m3 (4) | 5.0 | |
| April 3, 2020, 3 p.m. | 6.0 ppb (6) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 0.0 μg/m3 (0) | 6.0 | |
| April 3, 2020, 2 p.m. | 6.0 ppb (6) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | -1.0 μg/m3 (0) | 6.0 | |
| April 3, 2020, 1 p.m. | 6.0 ppb (6) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 1.0 μg/m3 (4) | 6.0 | |
| April 3, 2020, noon | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 3, 2020, 11 a.m. | 14.0 ppb (13) | 3.0 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 2.0 μg/m3 (8) | 13.0 | |
| April 3, 2020, 10 a.m. | 32.0 ppb (30) | 9.0 ppb (8) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 2.0 μg/m3 (8) | 30.0 | |
| April 3, 2020, 9 a.m. | 27.0 ppb (25) | 8.0 ppb (7) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 3.0 μg/m3 (12) | 25.0 | |
| April 3, 2020, 8 a.m. | 23.0 ppb (21) | 6.0 ppb (6) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 3.0 μg/m3 (12) | 21.0 | |
| April 3, 2020, 7 a.m. | 25.0 ppb (23) | 7.0 ppb (6) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 2.0 μg/m3 (8) | 23.0 | |
| April 3, 2020, 6 a.m. | 27.0 ppb (25) | 9.0 ppb (8) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 2.0 μg/m3 (8) | 25.0 | |
| April 3, 2020, 5 a.m. | 18.0 ppb (17) | 4.0 ppb (4) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 2.0 μg/m3 (8) | 17.0 | |
| April 3, 2020, 4 a.m. | 13.0 ppb (12) | 3.0 ppb (3) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| April 3, 2020, 3 a.m. | 13.0 ppb (12) | 4.0 ppb (4) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| April 3, 2020, 2 a.m. | 11.0 ppb (10) | 3.0 ppb (3) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 3, 2020, 1 a.m. | 10.0 ppb (9) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| April 3, 2020, midnight | 10.0 ppb (9) | 3.0 ppb (3) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 2.0 μg/m3 (8) | 9.0 | |
| April 2, 2020, 11 p.m. | 11.0 ppb (10) | 3.0 ppb (3) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| April 2, 2020, 10 p.m. | 10.0 ppb (9) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| April 2, 2020, 9 p.m. | 13.0 ppb (12) | 5.0 ppb (5) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 1.0 μg/m3 (4) | 12.0 | |
| April 2, 2020, 8 p.m. | 13.0 ppb (12) | 5.0 ppb (5) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 2.0 μg/m3 (8) | 12.0 | |
| April 2, 2020, 7 p.m. | 18.0 ppb (17) | 8.0 ppb (7) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 2, 2020, 6 p.m. | 18.0 ppb (17) | 7.0 ppb (6) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 2, 2020, 5 p.m. | 19.0 ppb (18) | 7.0 ppb (6) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 2.0 μg/m3 (8) | 18.0 | |
| April 2, 2020, 4 p.m. | 17.0 ppb (16) | 7.0 ppb (6) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 3.0 μg/m3 (12) | 16.0 | |
| April 2, 2020, 3 p.m. | 19.0 ppb (18) | 8.0 ppb (7) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 2.0 μg/m3 (8) | 18.0 | |
| April 2, 2020, 2 p.m. | 20.0 ppb (19) | 9.0 ppb (8) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 19.0 | |
| April 2, 2020, 1 p.m. | 23.0 ppb (21) | 10.0 ppb (9) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 4.0 μg/m3 (17) | 21.0 | |
| April 2, 2020, noon | 19.0 ppb (18) | 8.0 ppb (7) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 2, 2020, 11 a.m. | 28.0 ppb (26) | 11.0 ppb (10) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 5.0 μg/m3 (21) | 26.0 | |
| April 2, 2020, 10 a.m. | 26.0 ppb (24) | 10.0 ppb (9) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 2, 2020, 9 a.m. | 20.0 ppb (19) | 6.0 ppb (6) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| April 2, 2020, 8 a.m. | 14.0 ppb (13) | 4.0 ppb (4) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 2, 2020, 7 a.m. | 16.0 ppb (15) | 3.0 ppb (3) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 2.0 μg/m3 (8) | 15.0 | |
| April 2, 2020, 6 a.m. | 12.0 ppb (11) | 2.0 ppb (2) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | 11.0 | |
| April 2, 2020, 5 a.m. | 11.0 ppb (10) | 2.0 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 10.0 | |
| April 2, 2020, 4 a.m. | 8.0 ppb (7) | 0.0 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 2, 2020, 3 a.m. | 12.0 ppb (11) | 1.0 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 2, 2020, 2 a.m. | 13.0 ppb (12) | 1.0 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 2.0 μg/m3 (8) | 12.0 | |
| April 2, 2020, 1 a.m. | 15.0 ppb (14) | 1.0 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 2, 2020, midnight | 12.0 ppb (11) | 1.0 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 1, 2020, 11 p.m. | 10.0 ppb (9) | 1.0 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| April 1, 2020, 10 p.m. | 6.0 ppb (6) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 1.0 μg/m3 (4) | 6.0 | |
| April 1, 2020, 9 p.m. | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 6.0 | |
| April 1, 2020, 8 p.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 | 4.0 μg/m3 (17) | 17.0 | |
| April 1, 2020, 7 p.m. | 11.0 ppb (10) | 3.0 ppb (3) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| April 1, 2020, 6 p.m. | 8.0 ppb (7) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| April 1, 2020, 5 p.m. | 8.0 ppb (7) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 1, 2020, 4 p.m. | 7.0 ppb (6) | 2.0 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 | |
| April 1, 2020, 3 p.m. | 8.0 ppb (7) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| April 1, 2020, 2 p.m. | 7.0 ppb (6) | 2.0 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 1, 2020, 1 p.m. | 9.0 ppb (8) | 3.0 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| April 1, 2020, noon | 16.0 ppb (15) | 4.0 ppb (4) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| April 1, 2020, 11 a.m. | 17.0 ppb (16) | 3.0 ppb (3) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| April 1, 2020, 10 a.m. | 22.0 ppb (20) | 3.0 ppb (3) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 1, 2020, 9 a.m. | 32.0 ppb (30) | 8.0 ppb (7) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 6.0 μg/m3 (25) | 30.0 | |
| April 1, 2020, 8 a.m. | 44.0 ppb (41) | 12.0 ppb (11) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 9.0 μg/m3 (38) | 41.0 | |
| April 1, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| April 1, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| April 1, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| April 1, 2020, 4 a.m. | 37.0 ppb (34) | 7.0 ppb (6) | N/A | 30.0 ppb (28) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| April 1, 2020, 3 a.m. | 26.0 ppb (24) | 4.0 ppb (4) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| April 1, 2020, 2 a.m. | 15.0 ppb (14) | 2.0 ppb (2) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| April 1, 2020, 1 a.m. | 7.0 ppb (6) | 0.0 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| April 1, 2020, midnight | 6.0 ppb (6) | 1.0 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 | |
| March 31, 2020, 11 p.m. | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 31, 2020, 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 | 7.0 μg/m3 (29) | 29.0 | |
| March 31, 2020, 9 p.m. | 3.0 ppb (3) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 31, 2020, 8 p.m. | 3.0 ppb (3) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 31, 2020, 7 p.m. | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 31, 2020, 6 p.m. | 3.0 ppb (3) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 31, 2020, 5 p.m. | 3.0 ppb (3) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 31, 2020, 4 p.m. | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 31, 2020, 3 p.m. | 5.0 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 31, 2020, 2 p.m. | 10.0 ppb (9) | 3.0 ppb (3) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 31, 2020, 1 p.m. | 12.0 ppb (11) | 4.0 ppb (4) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 31, 2020, noon | 13.0 ppb (12) | 4.0 ppb (4) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 31, 2020, 11 a.m. | 14.0 ppb (13) | 4.0 ppb (4) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 31, 2020, 10 a.m. | 10.0 ppb (9) | 2.0 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 31, 2020, 9 a.m. | 8.0 ppb (7) | 1.0 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 31, 2020, 8 a.m. | 6.0 ppb (6) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 31, 2020, 7 a.m. | 7.0 ppb (6) | 0.0 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 31, 2020, 6 a.m. | 7.0 ppb (6) | 0.0 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 31, 2020, 5 a.m. | 5.0 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 31, 2020, 4 a.m. | 5.0 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| March 31, 2020, 3 a.m. | 8.0 ppb (7) | 0.0 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| March 31, 2020, 2 a.m. | 8.0 ppb (7) | 1.0 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 31, 2020, 1 a.m. | 5.0 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 31, 2020, midnight | 5.0 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 30, 2020, 11 p.m. | 8.0 ppb (7) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 30, 2020, 10 p.m. | 5.0 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 30, 2020, 9 p.m. | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| March 30, 2020, 8 p.m. | 8.0 ppb (7) | 1.0 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 30, 2020, 7 p.m. | 9.0 ppb (8) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 30, 2020, 6 p.m. | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 30, 2020, 5 p.m. | 6.0 ppb (6) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 30, 2020, 4 p.m. | 5.0 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 30, 2020, 3 p.m. | 9.0 ppb (8) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 30, 2020, 2 p.m. | 10.0 ppb (9) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 30, 2020, 1 p.m. | 10.0 ppb (9) | 1.0 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 30, 2020, noon | 10.0 ppb (9) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 30, 2020, 11 a.m. | 7.0 ppb (6) | 0.0 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 30, 2020, 10 a.m. | 11.0 ppb (10) | 1.0 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 30, 2020, 9 a.m. | 8.0 ppb (7) | 1.0 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 30, 2020, 8 a.m. | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 30, 2020, 7 a.m. | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 30, 2020, 6 a.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 30, 2020, 5 a.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 30, 2020, 4 a.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 30, 2020, 3 a.m. | 8.0 ppb (7) | 1.0 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 30, 2020, 2 a.m. | 6.0 ppb (6) | 0.0 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 30, 2020, 1 a.m. | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| March 30, 2020, midnight | 2.0 ppb (2) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| March 29, 2020, 11 p.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 29, 2020, 10 p.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 29, 2020, 9 p.m. | 3.0 ppb (3) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 29, 2020, 8 p.m. | 3.0 ppb (3) | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 29, 2020, 7 p.m. | 2.0 ppb (2) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 29, 2020, 6 p.m. | 3.0 ppb (3) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 29, 2020, 5 p.m. | 3.0 ppb (3) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 29, 2020, 4 p.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 29, 2020, 3 p.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 29, 2020, 2 p.m. | 4.0 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 29, 2020, 1 p.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 29, 2020, noon | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 29, 2020, 11 a.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 29, 2020, 10 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 | 4.0 μg/m3 (17) | 17.0 | |
| March 29, 2020, 9 a.m. | 1.0 ppb (1) | 0.0 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 29, 2020, 8 a.m. | 1.0 ppb (1) | 0.0 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 29, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 29, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 29, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 29, 2020, 4 a.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 29, 2020, 3 a.m. | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 29, 2020, 2 a.m. | 8.0 ppb (7) | 1.0 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 29, 2020, 1 a.m. | 9.0 ppb (8) | 1.0 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 29, 2020, midnight | 11.0 ppb (10) | 1.0 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 28, 2020, 11 p.m. | 12.0 ppb (11) | 2.0 ppb (2) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 28, 2020, 10 p.m. | 12.0 ppb (11) | 1.0 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 28, 2020, 9 p.m. | 22.0 ppb (20) | 3.0 ppb (3) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 28, 2020, 8 p.m. | 14.0 ppb (13) | 3.0 ppb (3) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 28, 2020, 7 p.m. | 5.0 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 28, 2020, 6 p.m. | 6.0 ppb (6) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 28, 2020, 5 p.m. | 5.0 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 28, 2020, 4 p.m. | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 28, 2020, 3 p.m. | 9.0 ppb (8) | 3.0 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 28, 2020, 2 p.m. | 7.0 ppb (6) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 28, 2020, 1 p.m. | 19.0 ppb (18) | 6.0 ppb (6) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 28, 2020, noon | 35.0 ppb (32) | 12.0 ppb (11) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 28, 2020, 11 a.m. | 76.0 ppb (73) | 35.0 ppb (32) | N/A | 41.0 ppb (38) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | 8.0 μg/m3 (33) | 73.0 | |
| March 28, 2020, 10 a.m. | 55.0 ppb (51) | 17.0 ppb (16) | N/A | 38.0 ppb (35) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 6.0 μg/m3 (25) | 51.0 | |
| March 28, 2020, 9 a.m. | 32.0 ppb (30) | 6.0 ppb (6) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 5.0 μg/m3 (21) | 30.0 | |
| March 28, 2020, 8 a.m. | 17.0 ppb (16) | 1.0 ppb (1) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 28, 2020, 7 a.m. | 14.0 ppb (13) | 1.0 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 28, 2020, 6 a.m. | 13.0 ppb (12) | 1.0 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 |