Boston MA, US: 42.325197, -71.056056
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| May 23, 2019, 10 p.m. | 10.0 ppb (9) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 1.0 μg/m3 (4) | 9.0 | |
| May 23, 2019, 9 p.m. | 11.0 ppb (10) | 2.0 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 23, 2019, 8 p.m. | 16.0 ppb (15) | 4.0 ppb (4) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 23, 2019, 7 p.m. | 14.0 ppb (13) | 4.0 ppb (4) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 23, 2019, 6 p.m. | 19.0 ppb (18) | 7.0 ppb (6) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 23, 2019, 5 p.m. | 21.0 ppb (19) | 9.0 ppb (8) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 23, 2019, 4 p.m. | 28.0 ppb (26) | 12.0 ppb (11) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 23, 2019, 3 p.m. | 37.0 ppb (34) | 19.0 ppb (18) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 23, 2019, 2 p.m. | 31.0 ppb (29) | 15.0 ppb (14) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 23, 2019, 1 p.m. | 34.0 ppb (31) | 18.0 ppb (17) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 23, 2019, noon | 37.0 ppb (34) | 18.0 ppb (17) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 23, 2019, 11 a.m. | 41.0 ppb (38) | 21.0 ppb (19) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 6.0 μg/m3 (25) | 38.0 | |
| May 23, 2019, 10 a.m. | 36.0 ppb (33) | 17.0 ppb (16) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 7.0 μg/m3 (29) | 33.0 | |
| May 23, 2019, 9 a.m. | 28.0 ppb (26) | 12.0 ppb (11) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 6.0 μg/m3 (25) | 26.0 | |
| May 23, 2019, 8 a.m. | 14.0 ppb (13) | 4.0 ppb (4) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 23, 2019, 7 a.m. | 8.0 ppb (7) | 1.0 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| May 23, 2019, 6 a.m. | 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 | 2.0 μg/m3 (8) | 8.0 | |
| May 23, 2019, 5 a.m. | 11.0 ppb (10) | 2.0 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 23, 2019, 4 a.m. | 25.0 ppb (23) | 12.0 ppb (11) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 3.0 μg/m3 (12) | 23.0 | |
| May 23, 2019, 3 a.m. | 27.0 ppb (25) | 12.0 ppb (11) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 0.0 μg/m3 (0) | 25.0 | |
| May 23, 2019, 2 a.m. | 14.0 ppb (13) | 2.0 ppb (2) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 1.0 μg/m3 (4) | 13.0 | |
| May 23, 2019, 1 a.m. | 17.0 ppb (16) | 3.0 ppb (3) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 2.0 μg/m3 (8) | 16.0 | |
| May 23, 2019, midnight | 14.0 ppb (13) | 3.0 ppb (3) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | -2.0 μg/m3 (0) | 13.0 | |
| May 22, 2019, 11 p.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | -1.0 μg/m3 (0) | 4.0 | |
| May 22, 2019, 10 p.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 22, 2019, 9 p.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 | 6.0 μg/m3 (25) | 25.0 | |
| May 22, 2019, 8 p.m. | 2.0 ppb (2) | -1.0 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 | |
| May 22, 2019, 7 p.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 | |
| May 22, 2019, 6 p.m. | 3.0 ppb (3) | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 22, 2019, 5 p.m. | 17.0 ppb (16) | 7.0 ppb (6) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 22, 2019, 4 p.m. | 25.0 ppb (23) | 12.0 ppb (11) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 4.0 μg/m3 (17) | 23.0 | |
| May 22, 2019, 3 p.m. | 25.0 ppb (23) | 13.0 ppb (12) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 4.0 μg/m3 (17) | 23.0 | |
| May 22, 2019, 2 p.m. | 20.0 ppb (19) | 9.0 ppb (8) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 4.0 μg/m3 (17) | 19.0 | |
| May 22, 2019, 1 p.m. | 24.0 ppb (22) | 11.0 ppb (10) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 22, 2019, noon | 26.0 ppb (24) | 12.0 ppb (11) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 22, 2019, 11 a.m. | 25.0 ppb (23) | 11.0 ppb (10) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 5.0 μg/m3 (21) | 23.0 | |
| May 22, 2019, 10 a.m. | 42.0 ppb (39) | 21.0 ppb (19) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 39.0 | |
| May 22, 2019, 9 a.m. | 23.0 ppb (21) | 9.0 ppb (8) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 4.0 μg/m3 (17) | 21.0 | |
| May 22, 2019, 8 a.m. | 21.0 ppb (19) | 6.0 ppb (6) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 22, 2019, 7 a.m. | 14.0 ppb (13) | 3.0 ppb (3) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 22, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 22, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 22, 2019, 4 a.m. | 18.0 ppb (17) | 5.0 ppb (5) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 22, 2019, 3 a.m. | 14.0 ppb (13) | 2.0 ppb (2) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 22, 2019, 2 a.m. | 14.0 ppb (13) | 3.0 ppb (3) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 0.0 μg/m3 (0) | 13.0 | |
| May 22, 2019, 1 a.m. | 9.0 ppb (8) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 0.0 μg/m3 (0) | 8.0 | |
| May 22, 2019, midnight | 11.0 ppb (10) | 2.0 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 2.0 μg/m3 (8) | 10.0 | |
| May 21, 2019, 11 p.m. | 11.0 ppb (10) | 3.0 ppb (3) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 21, 2019, 10 p.m. | 12.0 ppb (11) | 3.0 ppb (3) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 21, 2019, 9 p.m. | 12.0 ppb (11) | 4.0 ppb (4) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 21, 2019, 8 p.m. | 11.0 ppb (10) | 4.0 ppb (4) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 21, 2019, 7 p.m. | 16.0 ppb (15) | 7.0 ppb (6) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 21, 2019, 6 p.m. | 17.0 ppb (16) | 8.0 ppb (7) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 21, 2019, 5 p.m. | 20.0 ppb (19) | 10.0 ppb (9) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 4.0 μg/m3 (17) | 19.0 | |
| May 21, 2019, 4 p.m. | 21.0 ppb (19) | 10.0 ppb (9) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 2.0 μg/m3 (8) | 19.0 | |
| May 21, 2019, 3 p.m. | 24.0 ppb (22) | 13.0 ppb (12) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 4.0 μg/m3 (17) | 22.0 | |
| May 21, 2019, 2 p.m. | 25.0 ppb (23) | 13.0 ppb (12) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 5.0 μg/m3 (21) | 23.0 | |
| May 21, 2019, 1 p.m. | 28.0 ppb (26) | 17.0 ppb (16) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 4.0 μg/m3 (17) | 26.0 | |
| May 21, 2019, noon | 27.0 ppb (25) | 16.0 ppb (15) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 4.0 μg/m3 (17) | 25.0 | |
| May 21, 2019, 11 a.m. | 27.0 ppb (25) | 16.0 ppb (15) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 5.0 μg/m3 (21) | 25.0 | |
| May 21, 2019, 10 a.m. | 30.0 ppb (28) | 17.0 ppb (16) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 1.0 μg/m3 (4) | 28.0 | |
| May 21, 2019, 9 a.m. | 18.0 ppb (17) | 8.0 ppb (7) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | -1.0 μg/m3 (0) | 17.0 | |
| May 21, 2019, 8 a.m. | 10.0 ppb (9) | 3.0 ppb (3) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 1.0 μg/m3 (4) | 9.0 | |
| May 21, 2019, 7 a.m. | 8.0 ppb (7) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 0.0 μg/m3 (0) | 7.0 | |
| May 21, 2019, 6 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 | -1.0 μg/m3 (0) | 5.0 | |
| May 21, 2019, 5 a.m. | 7.0 ppb (6) | 0.0 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 21, 2019, 4 a.m. | 8.0 ppb (7) | 0.0 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 21, 2019, 3 a.m. | 9.0 ppb (8) | 0.0 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 21, 2019, 2 a.m. | 10.0 ppb (9) | 1.0 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 21, 2019, 1 a.m. | 13.0 ppb (12) | 1.0 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 21, 2019, midnight | 14.0 ppb (13) | 1.0 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 20, 2019, 11 p.m. | 10.0 ppb (9) | 1.0 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 20, 2019, 10 p.m. | 11.0 ppb (10) | 1.0 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 20, 2019, 9 p.m. | 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 | 6.0 μg/m3 (25) | 25.0 | |
| May 20, 2019, 8 p.m. | 15.0 ppb (14) | 3.0 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 20, 2019, 7 p.m. | 15.0 ppb (14) | 4.0 ppb (4) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 20, 2019, 6 p.m. | 16.0 ppb (15) | 4.0 ppb (4) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 20, 2019, 5 p.m. | 24.0 ppb (22) | 10.0 ppb (9) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 20, 2019, 4 p.m. | 26.0 ppb (24) | 9.0 ppb (8) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 16.0 μg/m3 (59) | 59.0 | |
| May 20, 2019, 3 p.m. | 24.0 ppb (22) | 10.0 ppb (9) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 17.0 μg/m3 (61) | 61.0 | |
| May 20, 2019, 2 p.m. | 33.0 ppb (31) | 15.0 ppb (14) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 20, 2019, 1 p.m. | 39.0 ppb (36) | 19.0 ppb (18) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 20, 2019, noon | 40.0 ppb (37) | 18.0 ppb (17) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 7.0 μg/m3 (29) | 37.0 | |
| May 20, 2019, 11 a.m. | 30.0 ppb (28) | 12.0 ppb (11) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 17.0 μg/m3 (61) | 61.0 | |
| May 20, 2019, 10 a.m. | 26.0 ppb (24) | 10.0 ppb (9) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | N/A | 24.0 | |
| May 20, 2019, 9 a.m. | 16.0 ppb (15) | 4.0 ppb (4) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 20, 2019, 8 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 | 7.0 μg/m3 (29) | 29.0 | |
| May 20, 2019, 7 a.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 20, 2019, 6 a.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 20, 2019, 5 a.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 20, 2019, 4 a.m. | 3.0 ppb (3) | -1.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 20, 2019, 3 a.m. | 6.0 ppb (6) | 0.0 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 20, 2019, 2 a.m. | 5.0 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 20, 2019, 1 a.m. | 6.0 ppb (6) | 0.0 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 20, 2019, midnight | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 19, 2019, 11 p.m. | 8.0 ppb (7) | 1.0 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 19, 2019, 10 p.m. | 8.0 ppb (7) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 19, 2019, 9 p.m. | 8.0 ppb (7) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 19, 2019, 8 p.m. | 7.0 ppb (6) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 19, 2019, 7 p.m. | 9.0 ppb (8) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 17.0 μg/m3 (61) | 61.0 | |
| May 19, 2019, 6 p.m. | 9.0 ppb (8) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 19, 2019, 5 p.m. | 9.0 ppb (8) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 19, 2019, 4 p.m. | 12.0 ppb (11) | 2.0 ppb (2) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 19, 2019, 3 p.m. | 10.0 ppb (9) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 19, 2019, 2 p.m. | 9.0 ppb (8) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| May 19, 2019, 1 p.m. | 10.0 ppb (9) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 19, 2019, noon | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 11 a.m. | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 10 a.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 | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 9 a.m. | 7.0 ppb (6) | 0.0 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 19, 2019, 8 a.m. | 11.0 ppb (10) | 0.0 ppb (0) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 19, 2019, 7 a.m. | 13.0 ppb (12) | 1.0 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 19, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 4 a.m. | 6.0 ppb (6) | -1.0 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 19, 2019, 3 a.m. | 3.0 ppb (3) | -1.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 19, 2019, 2 a.m. | 4.0 ppb (4) | -1.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 19, 2019, 1 a.m. | 11.0 ppb (10) | 1.0 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | -2.0 μg/m3 (0) | 10.0 | |
| May 19, 2019, midnight | 2.0 ppb (2) | -2.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | N/A | 4.0 | |
| May 18, 2019, 11 p.m. | 1.0 ppb (1) | -1.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 0.0 μg/m3 (0) | 2.0 | |
| May 18, 2019, 10 p.m. | 2.0 ppb (2) | -1.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 18, 2019, 9 p.m. | 1.0 ppb (1) | -1.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 18, 2019, 8 p.m. | 2.0 ppb (2) | -1.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 1.0 μg/m3 (4) | 4.0 | |
| May 18, 2019, 7 p.m. | 6.0 ppb (6) | 0.0 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 18, 2019, 6 p.m. | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 18, 2019, 5 p.m. | 10.0 ppb (9) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 18, 2019, 4 p.m. | 11.0 ppb (10) | 4.0 ppb (4) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 18, 2019, 3 p.m. | 14.0 ppb (13) | 5.0 ppb (5) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 18, 2019, 2 p.m. | 14.0 ppb (13) | 5.0 ppb (5) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 2.0 μg/m3 (8) | 13.0 | |
| May 18, 2019, 1 p.m. | 16.0 ppb (15) | 7.0 ppb (6) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 3.0 μg/m3 (12) | 15.0 | |
| May 18, 2019, noon | 15.0 ppb (14) | 6.0 ppb (6) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 3.0 μg/m3 (12) | 14.0 | |
| May 18, 2019, 11 a.m. | 18.0 ppb (17) | 8.0 ppb (7) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 18, 2019, 10 a.m. | 19.0 ppb (18) | 7.0 ppb (6) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 18, 2019, 9 a.m. | 14.0 ppb (13) | 3.0 ppb (3) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 18, 2019, 8 a.m. | 13.0 ppb (12) | 2.0 ppb (2) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 18, 2019, 7 a.m. | 10.0 ppb (9) | 1.0 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 18, 2019, 6 a.m. | 11.0 ppb (10) | 1.0 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 18, 2019, 5 a.m. | 12.0 ppb (11) | 1.0 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 18, 2019, 4 a.m. | 12.0 ppb (11) | 1.0 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 18, 2019, 3 a.m. | 15.0 ppb (14) | 1.0 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 18, 2019, 2 a.m. | 17.0 ppb (16) | 2.0 ppb (2) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 18, 2019, 1 a.m. | 23.0 ppb (21) | 2.0 ppb (2) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.36 ppb (4) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 18, 2019, midnight | 30.0 ppb (28) | 3.0 ppb (3) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | 16.0 μg/m3 (59) | 59.0 | |
| May 17, 2019, 11 p.m. | 37.0 ppb (34) | 10.0 ppb (9) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 18.0 μg/m3 (63) | 63.0 | |
| May 17, 2019, 10 p.m. | 40.0 ppb (37) | 13.0 ppb (12) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.38 ppb (4) | N/A | 20.0 μg/m3 (67) | 67.0 | |
| May 17, 2019, 9 p.m. | 66.0 ppb (63) | 31.0 ppb (29) | N/A | 36.0 ppb (33) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 24.0 μg/m3 (76) | 76.0 | |
| May 17, 2019, 8 p.m. | 69.0 ppb (66) | 29.0 ppb (27) | N/A | 40.0 ppb (37) | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 24.0 μg/m3 (76) | 76.0 | |
| May 17, 2019, 7 p.m. | 57.0 ppb (53) | 27.0 ppb (25) | N/A | 30.0 ppb (28) | N/A | N/A | N/A | 0.47 ppb (5) | N/A | 19.0 μg/m3 (65) | 65.0 | |
| May 17, 2019, 6 p.m. | 22.0 ppb (20) | 4.0 ppb (4) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 17, 2019, 5 p.m. | 27.0 ppb (25) | 6.0 ppb (6) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 17.0 μg/m3 (61) | 61.0 | |
| May 17, 2019, 4 p.m. | 33.0 ppb (31) | 9.0 ppb (8) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 18.0 μg/m3 (63) | 63.0 | |
| May 17, 2019, 3 p.m. | 23.0 ppb (21) | 6.0 ppb (6) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 17, 2019, 2 p.m. | 16.0 ppb (15) | 1.0 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 17, 2019, 1 p.m. | 23.0 ppb (21) | 3.0 ppb (3) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 17, 2019, noon | 25.0 ppb (23) | 5.0 ppb (5) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 17, 2019, 11 a.m. | 74.0 ppb (71) | 39.0 ppb (36) | N/A | 36.0 ppb (33) | N/A | N/A | N/A | 0.46 ppb (5) | N/A | 15.0 μg/m3 (56) | 71.0 | |
| May 17, 2019, 10 a.m. | 91.0 ppb (89) | 53.0 ppb (49) | N/A | 37.0 ppb (34) | N/A | N/A | N/A | 0.54 ppb (6) | N/A | 18.0 μg/m3 (63) | 89.0 | |
| May 17, 2019, 9 a.m. | 59.0 ppb (55) | 24.0 ppb (22) | N/A | 35.0 ppb (32) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 17.0 μg/m3 (61) | 61.0 | |
| May 17, 2019, 8 a.m. | 57.0 ppb (53) | 23.0 ppb (21) | N/A | 34.0 ppb (31) | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 16.0 μg/m3 (59) | 59.0 | |
| May 17, 2019, 7 a.m. | 44.0 ppb (41) | 10.0 ppb (9) | N/A | 34.0 ppb (31) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 17, 2019, 6 a.m. | 26.0 ppb (24) | 3.0 ppb (3) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 17, 2019, 5 a.m. | 23.0 ppb (21) | 0.0 ppb (0) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 17, 2019, 4 a.m. | 31.0 ppb (29) | 3.0 ppb (3) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 17, 2019, 3 a.m. | 29.0 ppb (27) | 4.0 ppb (4) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.36 ppb (4) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 17, 2019, 2 a.m. | 33.0 ppb (31) | 6.0 ppb (6) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 17, 2019, 1 a.m. | 42.0 ppb (39) | 12.0 ppb (11) | N/A | 30.0 ppb (28) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | 7.0 μg/m3 (29) | 39.0 | |
| May 17, 2019, midnight | 16.0 ppb (15) | 0.0 ppb (0) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 1.0 μg/m3 (4) | 16.0 | |
| May 16, 2019, 11 p.m. | 11.0 ppb (10) | 0.0 ppb (0) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 |