Boston MA, US: 42.325197, -71.056056
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 21, 2019, 9 a.m. | 50.0 ppb (46) | 15.0 ppb (14) | N/A | 35.0 ppb (32) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 8.0 μg/m3 (33) | 46.0 | |
| March 21, 2019, 8 a.m. | 36.0 ppb (33) | 9.0 ppb (8) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 21, 2019, 7 a.m. | 22.0 ppb (20) | 2.0 ppb (2) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 21, 2019, 6 a.m. | 18.0 ppb (17) | 1.0 ppb (1) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 21, 2019, 5 a.m. | 17.0 ppb (16) | 1.0 ppb (1) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 21, 2019, 4 a.m. | 22.0 ppb (20) | 2.0 ppb (2) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 21, 2019, 3 a.m. | 21.0 ppb (19) | 2.0 ppb (2) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 21, 2019, 2 a.m. | 18.0 ppb (17) | 2.0 ppb (2) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 21, 2019, 1 a.m. | 15.0 ppb (14) | 1.0 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 21, 2019, midnight | 15.0 ppb (14) | 2.0 ppb (2) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 3.0 μg/m3 (12) | 14.0 | |
| March 20, 2019, 11 p.m. | 15.0 ppb (14) | 2.0 ppb (2) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 20, 2019, 10 p.m. | 15.0 ppb (14) | 2.0 ppb (2) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 20, 2019, 9 p.m. | 12.0 ppb (11) | 2.0 ppb (2) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 20, 2019, 8 p.m. | 11.0 ppb (10) | 2.0 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 20, 2019, 7 p.m. | 6.0 ppb (6) | 0.0 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 20, 2019, 6 p.m. | 5.0 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 20, 2019, 5 p.m. | 6.0 ppb (6) | 0.0 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 16.0 μg/m3 (59) | 59.0 | |
| March 20, 2019, 4 p.m. | 13.0 ppb (12) | 3.0 ppb (3) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | N/A | 12.0 | |
| March 20, 2019, 3 p.m. | 17.0 ppb (16) | 5.0 ppb (5) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| March 20, 2019, 2 p.m. | 40.0 ppb (37) | 18.0 ppb (17) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 20, 2019, 1 p.m. | 67.0 ppb (64) | 34.0 ppb (31) | N/A | 33.0 ppb (31) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 12.0 μg/m3 (50) | 64.0 | |
| March 20, 2019, noon | 98.0 ppb (97) | 56.0 ppb (52) | N/A | 42.0 ppb (39) | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 11.0 μg/m3 (46) | 97.0 | |
| March 20, 2019, 11 a.m. | 124.0 ppb (104) | 75.0 ppb (72) | N/A | 49.0 ppb (45) | N/A | N/A | N/A | 0.68 ppb (8) | N/A | 17.0 μg/m3 (61) | 104.0 | |
| March 20, 2019, 10 a.m. | 156.0 ppb (111) | 103.0 ppb (100) | N/A | 53.0 ppb (49) | N/A | N/A | N/A | N/A | N/A | 17.0 μg/m3 (61) | 111.0 | |
| March 20, 2019, 9 a.m. | 106.0 ppb (101) | 57.0 ppb (53) | N/A | 49.0 ppb (45) | N/A | N/A | N/A | 0.67 ppb (7) | N/A | 12.0 μg/m3 (50) | 101.0 | |
| March 20, 2019, 8 a.m. | 73.0 ppb (70) | 27.0 ppb (25) | N/A | 47.0 ppb (44) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 9.0 μg/m3 (38) | 70.0 | |
| March 20, 2019, 7 a.m. | 50.0 ppb (46) | 11.0 ppb (10) | N/A | 40.0 ppb (37) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 7.0 μg/m3 (29) | 46.0 | |
| March 20, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 20, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.47 ppb (5) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| March 20, 2019, 4 a.m. | 85.0 ppb (83) | 34.0 ppb (31) | N/A | 51.0 ppb (47) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 10.0 μg/m3 (42) | 83.0 | |
| March 20, 2019, 3 a.m. | 61.0 ppb (57) | 16.0 ppb (15) | N/A | 45.0 ppb (42) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 8.0 μg/m3 (33) | 57.0 | |
| March 20, 2019, 2 a.m. | 31.0 ppb (29) | 4.0 ppb (4) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 20, 2019, 1 a.m. | 25.0 ppb (23) | 3.0 ppb (3) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 20, 2019, midnight | 22.0 ppb (20) | 2.0 ppb (2) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 19, 2019, 11 p.m. | 22.0 ppb (20) | 4.0 ppb (4) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 19, 2019, 10 p.m. | 18.0 ppb (17) | 4.0 ppb (4) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 19, 2019, 9 p.m. | 15.0 ppb (14) | 4.0 ppb (4) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 19, 2019, 8 p.m. | 15.0 ppb (14) | 4.0 ppb (4) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 19, 2019, 7 p.m. | 18.0 ppb (17) | 6.0 ppb (6) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 19, 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 | |
| March 19, 2019, 5 p.m. | 21.0 ppb (19) | 8.0 ppb (7) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 19, 2019, 4 p.m. | 23.0 ppb (21) | 9.0 ppb (8) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| March 19, 2019, 3 p.m. | 33.0 ppb (31) | 15.0 ppb (14) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 19, 2019, 2 p.m. | 36.0 ppb (33) | 17.0 ppb (16) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 19, 2019, 1 p.m. | 47.0 ppb (44) | 24.0 ppb (22) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 18.0 μg/m3 (63) | 63.0 | |
| March 19, 2019, noon | 71.0 ppb (68) | 36.0 ppb (33) | N/A | 34.0 ppb (31) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 11.0 μg/m3 (46) | 68.0 | |
| March 19, 2019, 11 a.m. | 84.0 ppb (82) | 43.0 ppb (40) | N/A | 41.0 ppb (38) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 16.0 μg/m3 (59) | 82.0 | |
| March 19, 2019, 10 a.m. | 99.0 ppb (98) | 53.0 ppb (49) | N/A | 45.0 ppb (42) | N/A | N/A | N/A | 0.47 ppb (5) | N/A | 12.0 μg/m3 (50) | 98.0 | |
| March 19, 2019, 9 a.m. | 57.0 ppb (53) | 21.0 ppb (19) | N/A | 36.0 ppb (33) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 16.0 μg/m3 (59) | 59.0 | |
| March 19, 2019, 8 a.m. | 47.0 ppb (44) | 14.0 ppb (13) | N/A | 33.0 ppb (31) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 19, 2019, 7 a.m. | 47.0 ppb (44) | 10.0 ppb (9) | N/A | 36.0 ppb (33) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 19, 2019, 6 a.m. | 47.0 ppb (44) | 8.0 ppb (7) | N/A | 38.0 ppb (35) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 16.0 μg/m3 (59) | 59.0 | |
| March 19, 2019, 5 a.m. | 53.0 ppb (49) | 10.0 ppb (9) | N/A | 43.0 ppb (40) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 10.0 μg/m3 (42) | 49.0 | |
| March 19, 2019, 4 a.m. | 58.0 ppb (54) | 13.0 ppb (12) | N/A | 45.0 ppb (42) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 11.0 μg/m3 (46) | 54.0 | |
| March 19, 2019, 3 a.m. | 56.0 ppb (52) | 15.0 ppb (14) | N/A | 41.0 ppb (38) | N/A | N/A | N/A | 0.47 ppb (5) | N/A | 9.0 μg/m3 (38) | 52.0 | |
| March 19, 2019, 2 a.m. | 39.0 ppb (36) | 8.0 ppb (7) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 7.0 μg/m3 (29) | 36.0 | |
| March 19, 2019, 1 a.m. | 29.0 ppb (27) | 6.0 ppb (6) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 6.0 μg/m3 (25) | 27.0 | |
| March 19, 2019, midnight | 23.0 ppb (21) | 4.0 ppb (4) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 18, 2019, 11 p.m. | 17.0 ppb (16) | 3.0 ppb (3) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 18, 2019, 10 p.m. | 19.0 ppb (18) | 5.0 ppb (5) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 18, 2019, 9 p.m. | 15.0 ppb (14) | 4.0 ppb (4) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 18, 2019, 8 p.m. | 17.0 ppb (16) | 6.0 ppb (6) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 18, 2019, 7 p.m. | 20.0 ppb (19) | 8.0 ppb (7) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 18, 2019, 6 p.m. | 20.0 ppb (19) | 8.0 ppb (7) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 18, 2019, 5 p.m. | 24.0 ppb (22) | 10.0 ppb (9) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 5.0 μg/m3 (21) | 22.0 | |
| March 18, 2019, 4 p.m. | 23.0 ppb (21) | 9.0 ppb (8) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 18, 2019, 3 p.m. | 29.0 ppb (27) | 13.0 ppb (12) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 18, 2019, 2 p.m. | 41.0 ppb (38) | 20.0 ppb (19) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 6.0 μg/m3 (25) | 38.0 | |
| March 18, 2019, 1 p.m. | 42.0 ppb (39) | 21.0 ppb (19) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 8.0 μg/m3 (33) | 39.0 | |
| March 18, 2019, noon | 61.0 ppb (57) | 31.0 ppb (29) | N/A | 30.0 ppb (28) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 13.0 μg/m3 (52) | 57.0 | |
| March 18, 2019, 11 a.m. | 86.0 ppb (84) | 45.0 ppb (42) | N/A | 41.0 ppb (38) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 11.0 μg/m3 (46) | 84.0 | |
| March 18, 2019, 10 a.m. | 103.0 ppb (100) | 59.0 ppb (55) | N/A | 44.0 ppb (41) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 10.0 μg/m3 (42) | 100.0 | |
| March 18, 2019, 9 a.m. | 54.0 ppb (50) | 22.0 ppb (20) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 18, 2019, 8 a.m. | 30.0 ppb (28) | 8.0 ppb (7) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 18, 2019, 7 a.m. | 36.0 ppb (33) | 9.0 ppb (8) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 18, 2019, 6 a.m. | 14.0 ppb (13) | 1.0 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 18, 2019, 5 a.m. | 11.0 ppb (10) | 0.0 ppb (0) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 18, 2019, 4 a.m. | 11.0 ppb (10) | 1.0 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| March 18, 2019, 3 a.m. | 10.0 ppb (9) | 1.0 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 18, 2019, 2 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 | 7.0 μg/m3 (29) | 29.0 | |
| March 18, 2019, 1 a.m. | 16.0 ppb (15) | 3.0 ppb (3) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 18, 2019, midnight | 16.0 ppb (15) | 3.0 ppb (3) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 17, 2019, 11 p.m. | 14.0 ppb (13) | 2.0 ppb (2) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 17, 2019, 10 p.m. | 17.0 ppb (16) | 4.0 ppb (4) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 17, 2019, 9 p.m. | 11.0 ppb (10) | 3.0 ppb (3) | 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 | |
| March 17, 2019, 8 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 | 5.0 μg/m3 (21) | 21.0 | |
| March 17, 2019, 7 p.m. | 10.0 ppb (9) | 3.0 ppb (3) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 17, 2019, 6 p.m. | 10.0 ppb (9) | 4.0 ppb (4) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 17, 2019, 5 p.m. | 10.0 ppb (9) | 4.0 ppb (4) | 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 | |
| March 17, 2019, 4 p.m. | 10.0 ppb (9) | 4.0 ppb (4) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 17, 2019, 3 p.m. | 11.0 ppb (10) | 4.0 ppb (4) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 17, 2019, 2 p.m. | 11.0 ppb (10) | 4.0 ppb (4) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 17, 2019, 1 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 | |
| March 17, 2019, noon | 9.0 ppb (8) | 1.0 ppb (1) | 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 | |
| March 17, 2019, 11 a.m. | 11.0 ppb (10) | 2.0 ppb (2) | 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 | |
| March 17, 2019, 10 a.m. | 9.0 ppb (8) | 1.0 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 17, 2019, 9 a.m. | 6.0 ppb (6) | 0.0 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 17, 2019, 8 a.m. | 6.0 ppb (6) | 0.0 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 17, 2019, 7 a.m. | 5.0 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 17, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 17, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 17, 2019, 4 a.m. | 8.0 ppb (7) | 1.0 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 17, 2019, 3 a.m. | 8.0 ppb (7) | 1.0 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 17, 2019, 2 a.m. | 11.0 ppb (10) | 2.0 ppb (2) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 17, 2019, 1 a.m. | 11.0 ppb (10) | 2.0 ppb (2) | 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 | |
| March 17, 2019, midnight | 10.0 ppb (9) | 1.0 ppb (1) | 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 | |
| March 16, 2019, 11 p.m. | 10.0 ppb (9) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| March 16, 2019, 10 p.m. | 10.0 ppb (9) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 2.0 μg/m3 (8) | 9.0 | |
| March 16, 2019, 9 p.m. | 9.0 ppb (8) | 3.0 ppb (3) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 16, 2019, 8 p.m. | 9.0 ppb (8) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 16, 2019, 7 p.m. | 9.0 ppb (8) | 3.0 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 16, 2019, 6 p.m. | 10.0 ppb (9) | 4.0 ppb (4) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 16, 2019, 5 p.m. | 10.0 ppb (9) | 4.0 ppb (4) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 16, 2019, 4 p.m. | 13.0 ppb (12) | 5.0 ppb (5) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 16, 2019, 3 p.m. | 12.0 ppb (11) | 5.0 ppb (5) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 1.0 μg/m3 (4) | 11.0 | |
| March 16, 2019, 2 p.m. | 13.0 ppb (12) | 5.0 ppb (5) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 2.0 μg/m3 (8) | 12.0 | |
| March 16, 2019, 1 p.m. | 15.0 ppb (14) | 6.0 ppb (6) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 16, 2019, noon | 16.0 ppb (15) | 6.0 ppb (6) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 16, 2019, 11 a.m. | 18.0 ppb (17) | 6.0 ppb (6) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 16, 2019, 10 a.m. | 12.0 ppb (11) | 3.0 ppb (3) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 2.0 μg/m3 (8) | 11.0 | |
| March 16, 2019, 9 a.m. | 9.0 ppb (8) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| March 16, 2019, 8 a.m. | 9.0 ppb (8) | 1.0 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.04 ppb (0) | N/A | 0.0 μg/m3 (0) | 8.0 | |
| March 16, 2019, 7 a.m. | 7.0 ppb (6) | 0.0 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.03 ppb (0) | N/A | 1.0 μg/m3 (4) | 6.0 | |
| March 16, 2019, 6 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 | -2.0 μg/m3 (0) | 6.0 | |
| March 16, 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 | -1.0 μg/m3 (0) | 6.0 | |
| March 16, 2019, 4 a.m. | 10.0 ppb (9) | 1.0 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| March 16, 2019, 3 a.m. | 12.0 ppb (11) | 1.0 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 16, 2019, 2 a.m. | 12.0 ppb (11) | 2.0 ppb (2) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 16, 2019, 1 a.m. | 13.0 ppb (12) | 1.0 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 16, 2019, midnight | 16.0 ppb (15) | 3.0 ppb (3) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 2.0 μg/m3 (8) | 15.0 | |
| March 15, 2019, 11 p.m. | 15.0 ppb (14) | 2.0 ppb (2) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 2.0 μg/m3 (8) | 14.0 | |
| March 15, 2019, 10 p.m. | 14.0 ppb (13) | 2.0 ppb (2) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 15, 2019, 9 p.m. | 14.0 ppb (13) | 2.0 ppb (2) | 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 | |
| March 15, 2019, 8 p.m. | 14.0 ppb (13) | 3.0 ppb (3) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 15, 2019, 7 p.m. | 18.0 ppb (17) | 5.0 ppb (5) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 15, 2019, 6 p.m. | 19.0 ppb (18) | 6.0 ppb (6) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 15, 2019, 5 p.m. | 17.0 ppb (16) | 5.0 ppb (5) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 15, 2019, 4 p.m. | 22.0 ppb (20) | 7.0 ppb (6) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 4.0 μg/m3 (17) | 20.0 | |
| March 15, 2019, 3 p.m. | 27.0 ppb (25) | 10.0 ppb (9) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 3.0 μg/m3 (12) | 25.0 | |
| March 15, 2019, 2 p.m. | 25.0 ppb (23) | 8.0 ppb (7) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 15, 2019, 1 p.m. | 31.0 ppb (29) | 11.0 ppb (10) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 15, 2019, noon | 25.0 ppb (23) | 8.0 ppb (7) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 4.0 μg/m3 (17) | 23.0 | |
| March 15, 2019, 11 a.m. | 26.0 ppb (24) | 9.0 ppb (8) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 15, 2019, 10 a.m. | 25.0 ppb (23) | 7.0 ppb (6) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 4.0 μg/m3 (17) | 23.0 | |
| March 15, 2019, 9 a.m. | 22.0 ppb (20) | 4.0 ppb (4) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 15, 2019, 8 a.m. | 36.0 ppb (33) | 9.0 ppb (8) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 6.0 μg/m3 (25) | 33.0 | |
| March 15, 2019, 7 a.m. | 23.0 ppb (21) | 3.0 ppb (3) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 15, 2019, 6 a.m. | 9.0 ppb (8) | -1.0 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 2.0 μg/m3 (8) | 9.0 | |
| March 15, 2019, 5 a.m. | 12.0 ppb (11) | -1.0 ppb (0) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| March 15, 2019, 4 a.m. | 13.0 ppb (12) | 0.0 ppb (0) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | N/A | 12.0 | |
| March 15, 2019, 3 a.m. | 22.0 ppb (20) | 1.0 ppb (1) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | N/A | 20.0 | |
| March 15, 2019, 2 a.m. | 19.0 ppb (18) | 1.0 ppb (1) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 15, 2019, 1 a.m. | 25.0 ppb (23) | 3.0 ppb (3) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 15, 2019, midnight | 23.0 ppb (21) | 3.0 ppb (3) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 14, 2019, 11 p.m. | 23.0 ppb (21) | 3.0 ppb (3) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 14, 2019, 10 p.m. | 22.0 ppb (20) | 3.0 ppb (3) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 14, 2019, 9 p.m. | 18.0 ppb (17) | 3.0 ppb (3) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.11 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 14, 2019, 8 p.m. | 23.0 ppb (21) | 5.0 ppb (5) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 14, 2019, 7 p.m. | 24.0 ppb (22) | 6.0 ppb (6) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 14, 2019, 6 p.m. | 12.0 ppb (11) | 1.0 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 14, 2019, 5 p.m. | 8.0 ppb (7) | 0.0 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 14, 2019, 4 p.m. | 17.0 ppb (16) | 4.0 ppb (4) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.02 ppb (0) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 14, 2019, 3 p.m. | 32.0 ppb (30) | 11.0 ppb (10) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 14, 2019, 2 p.m. | 56.0 ppb (52) | 26.0 ppb (24) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 18.0 μg/m3 (63) | 63.0 | |
| March 14, 2019, 1 p.m. | 63.0 ppb (60) | 29.0 ppb (27) | N/A | 34.0 ppb (31) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 16.0 μg/m3 (59) | 60.0 | |
| March 14, 2019, noon | 70.0 ppb (67) | 30.0 ppb (28) | N/A | 40.0 ppb (37) | N/A | N/A | N/A | 0.33 ppb (4) | N/A | 12.0 μg/m3 (50) | 67.0 | |
| March 14, 2019, 11 a.m. | 86.0 ppb (84) | 40.0 ppb (37) | N/A | 46.0 ppb (43) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 15.0 μg/m3 (56) | 84.0 | |
| March 14, 2019, 10 a.m. | 69.0 ppb (66) | 28.0 ppb (26) | N/A | 41.0 ppb (38) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 66.0 |