Tacoma (I 5) WA, US: 47.22634, -122.46256
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 26, 2019, 2 p.m. | 61.5 ppb (58) | 29.9 ppb (28) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 58.0 | |
| March 26, 2019, 1 p.m. | 44.6 ppb (41) | 16.9 ppb (16) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 41.0 | |
| March 26, 2019, noon | 48.2 ppb (45) | 19.9 ppb (18) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 45.0 | |
| March 26, 2019, 11 a.m. | 42.5 ppb (39) | 16.4 ppb (15) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 39.0 | |
| March 26, 2019, 10 a.m. | 15.2 ppb (14) | 2.0 ppb (2) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 14.0 | |
| March 26, 2019, 9 a.m. | 15.9 ppb (15) | 4.0 ppb (4) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 26, 2019, 8 a.m. | 16.7 ppb (15) | 6.3 ppb (6) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 26, 2019, 7 a.m. | 26.4 ppb (24) | 8.6 ppb (8) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 24.0 | |
| March 26, 2019, 6 a.m. | 24.5 ppb (23) | 7.2 ppb (7) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 23.0 | |
| March 26, 2019, 5 a.m. | 30.1 ppb (28) | 9.2 ppb (9) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | 28.0 | |
| March 26, 2019, 4 a.m. | 18.8 ppb (17) | 7.3 ppb (7) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 17.0 | |
| March 26, 2019, 3 a.m. | 19.5 ppb (18) | 8.1 ppb (8) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 26, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 26, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 26, 2019, midnight | 38.5 ppb (36) | 18.2 ppb (17) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 36.0 | |
| March 25, 2019, 11 p.m. | 33.8 ppb (31) | 16.2 ppb (15) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 31.0 | |
| March 25, 2019, 10 p.m. | 48.6 ppb (45) | 29.2 ppb (27) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 45.0 | |
| March 25, 2019, 9 p.m. | 61.0 ppb (57) | 40.1 ppb (37) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 57.0 | |
| March 25, 2019, 8 p.m. | 59.6 ppb (56) | 32.9 ppb (30) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 56.0 | |
| March 25, 2019, 7 p.m. | 44.7 ppb (41) | 22.5 ppb (21) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 41.0 | |
| March 25, 2019, 6 p.m. | 39.6 ppb (37) | 20.0 ppb (19) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 25, 2019, 5 p.m. | 45.1 ppb (42) | 26.1 ppb (24) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 42.0 | |
| March 25, 2019, 4 p.m. | 48.5 ppb (45) | 28.2 ppb (26) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 45.0 | |
| March 25, 2019, 3 p.m. | 57.4 ppb (54) | 33.5 ppb (31) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 54.0 | |
| March 25, 2019, 2 p.m. | 47.8 ppb (44) | 23.5 ppb (22) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 44.0 | |
| March 25, 2019, 1 p.m. | 40.5 ppb (38) | 18.8 ppb (17) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 38.0 | |
| March 25, 2019, noon | 51.9 ppb (48) | 28.5 ppb (26) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 25, 2019, 11 a.m. | 32.4 ppb (30) | 9.4 ppb (9) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 25, 2019, 10 a.m. | 34.0 ppb (31) | 9.7 ppb (9) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 31.0 | |
| March 25, 2019, 9 a.m. | 32.4 ppb (30) | 9.3 ppb (9) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 30.0 | |
| March 25, 2019, 8 a.m. | 18.6 ppb (17) | 2.8 ppb (3) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 25, 2019, 7 a.m. | 18.5 ppb (17) | 1.6 ppb (1) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| March 25, 2019, 6 a.m. | 8.0 ppb (7) | 0.3 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 25, 2019, 5 a.m. | 9.9 ppb (9) | 0.8 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 25, 2019, 4 a.m. | 9.6 ppb (9) | 0.7 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 25, 2019, 3 a.m. | 6.3 ppb (6) | 0.5 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| March 25, 2019, 2 a.m. | 4.6 ppb (4) | 0.2 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 25, 2019, 1 a.m. | 3.5 ppb (3) | 0.3 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 25, 2019, midnight | 13.1 ppb (12) | 3.1 ppb (3) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 24, 2019, 11 p.m. | 9.1 ppb (8) | 2.1 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 24, 2019, 10 p.m. | 11.4 ppb (11) | 3.9 ppb (4) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 24, 2019, 9 p.m. | 8.6 ppb (8) | 3.1 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 8.0 | |
| March 24, 2019, 8 p.m. | 9.6 ppb (9) | 3.6 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 24, 2019, 7 p.m. | 18.4 ppb (17) | 8.6 ppb (8) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 24, 2019, 6 p.m. | 27.7 ppb (26) | 14.7 ppb (14) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 26.0 | |
| March 24, 2019, 5 p.m. | 28.4 ppb (26) | 17.0 ppb (16) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 24, 2019, 4 p.m. | 25.8 ppb (24) | 14.8 ppb (14) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 24, 2019, 3 p.m. | 21.5 ppb (20) | 11.8 ppb (11) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 24, 2019, 2 p.m. | 18.9 ppb (18) | 8.2 ppb (8) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 24, 2019, 1 p.m. | 13.7 ppb (13) | 6.2 ppb (6) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 24, 2019, noon | 14.6 ppb (14) | 6.9 ppb (6) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 24, 2019, 11 a.m. | 13.6 ppb (13) | 4.8 ppb (4) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 24, 2019, 10 a.m. | 13.7 ppb (13) | 4.3 ppb (4) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 24, 2019, 9 a.m. | 12.6 ppb (12) | 1.3 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 24, 2019, 8 a.m. | 13.8 ppb (13) | 1.0 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 24, 2019, 7 a.m. | 22.8 ppb (21) | 6.6 ppb (6) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 24, 2019, 6 a.m. | 23.3 ppb (22) | 8.3 ppb (8) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 22.0 | |
| March 24, 2019, 5 a.m. | 24.7 ppb (23) | 8.5 ppb (8) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 23.0 | |
| March 24, 2019, 4 a.m. | 25.4 ppb (24) | 9.6 ppb (9) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 24.0 | |
| March 24, 2019, 3 a.m. | 26.9 ppb (25) | 10.4 ppb (10) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 24, 2019, 2 a.m. | 33.4 ppb (31) | 13.8 ppb (13) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 31.0 | |
| March 24, 2019, 1 a.m. | 32.1 ppb (30) | 14.3 ppb (13) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 30.0 | |
| March 24, 2019, midnight | 31.9 ppb (30) | 16.7 ppb (15) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 30.0 | |
| March 23, 2019, 11 p.m. | 24.6 ppb (23) | 13.5 ppb (12) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 23.0 | |
| March 23, 2019, 10 p.m. | 23.7 ppb (22) | 13.1 ppb (12) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 22.0 | |
| March 23, 2019, 9 p.m. | 25.7 ppb (24) | 11.8 ppb (11) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 23, 2019, 8 p.m. | 31.5 ppb (29) | 14.5 ppb (13) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 29.0 | |
| March 23, 2019, 7 p.m. | 30.8 ppb (29) | 13.5 ppb (12) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 29.0 | |
| March 23, 2019, 6 p.m. | 20.4 ppb (19) | 8.1 ppb (8) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 23, 2019, 5 p.m. | 23.6 ppb (22) | 8.1 ppb (8) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| March 23, 2019, 4 p.m. | 67.8 ppb (65) | 40.9 ppb (38) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 65.0 | |
| March 23, 2019, 3 p.m. | 48.2 ppb (45) | 26.0 ppb (24) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 45.0 | |
| March 23, 2019, 2 p.m. | 23.0 ppb (21) | 4.6 ppb (4) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 21.0 | |
| March 23, 2019, 1 p.m. | 11.0 ppb (10) | 0.7 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 23, 2019, noon | 35.3 ppb (33) | 10.7 ppb (10) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| March 23, 2019, 11 a.m. | 32.4 ppb (30) | 6.7 ppb (6) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 30.0 | |
| March 23, 2019, 10 a.m. | 15.5 ppb (14) | 0.5 ppb (0) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 14.0 | |
| March 23, 2019, 9 a.m. | 17.1 ppb (16) | 2.8 ppb (3) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 23, 2019, 8 a.m. | 11.8 ppb (11) | 1.6 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 23, 2019, 7 a.m. | 15.5 ppb (14) | 3.9 ppb (4) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 23, 2019, 6 a.m. | 19.9 ppb (18) | 6.3 ppb (6) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 18.0 | |
| March 23, 2019, 5 a.m. | 24.2 ppb (22) | 10.0 ppb (9) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 23, 2019, 4 a.m. | 23.7 ppb (22) | 9.3 ppb (9) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 22.0 | |
| March 23, 2019, 3 a.m. | 24.3 ppb (23) | 10.9 ppb (10) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 23.0 | |
| March 23, 2019, 2 a.m. | 21.7 ppb (20) | 9.7 ppb (9) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 20.0 | |
| March 23, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 8.0 | |
| March 23, 2019, midnight | 24.8 ppb (23) | 9.8 ppb (9) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 23.0 | |
| March 22, 2019, 11 p.m. | 26.2 ppb (24) | 11.4 ppb (11) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 24.0 | |
| March 22, 2019, 10 p.m. | 17.4 ppb (16) | 7.9 ppb (7) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| March 22, 2019, 9 p.m. | 30.2 ppb (28) | 16.4 ppb (15) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 28.0 | |
| March 22, 2019, 8 p.m. | 40.0 ppb (37) | 22.5 ppb (21) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 37.0 | |
| March 22, 2019, 7 p.m. | 31.0 ppb (29) | 14.7 ppb (14) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| March 22, 2019, 6 p.m. | 49.1 ppb (45) | 24.8 ppb (23) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | N/A | N/A | 14.0 μg/m3 (54) | 54.0 | |
| March 22, 2019, 5 p.m. | 71.9 ppb (69) | 42.6 ppb (39) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | N/A | N/A | 16.0 μg/m3 (59) | 69.0 | |
| March 22, 2019, 4 p.m. | 76.8 ppb (74) | 48.1 ppb (45) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 74.0 | |
| March 22, 2019, 3 p.m. | 122.0 ppb (104) | 89.7 ppb (88) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 104.0 | |
| March 22, 2019, 2 p.m. | 67.7 ppb (65) | 37.0 ppb (34) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 65.0 | |
| March 22, 2019, 1 p.m. | 57.1 ppb (53) | 28.3 ppb (26) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 53.0 | |
| March 22, 2019, noon | 64.4 ppb (61) | 32.9 ppb (30) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 61.0 | |
| March 22, 2019, 11 a.m. | 50.3 ppb (47) | 21.7 ppb (20) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 47.0 | |
| March 22, 2019, 10 a.m. | 5.3 ppb (5) | 0.3 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 22, 2019, 9 a.m. | 5.4 ppb (5) | 0.1 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 22, 2019, 8 a.m. | 11.3 ppb (10) | 0.3 ppb (0) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| March 22, 2019, 7 a.m. | 27.1 ppb (25) | 8.5 ppb (8) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 25.0 | |
| March 22, 2019, 6 a.m. | 28.2 ppb (26) | 9.1 ppb (8) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 26.0 | |
| March 22, 2019, 5 a.m. | 29.6 ppb (27) | 10.9 ppb (10) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 27.0 | |
| March 22, 2019, 4 a.m. | 31.0 ppb (29) | 10.9 ppb (10) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 29.0 | |
| March 22, 2019, 3 a.m. | 26.8 ppb (25) | 11.0 ppb (10) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 25.0 | |
| March 22, 2019, 2 a.m. | 27.7 ppb (26) | 13.2 ppb (12) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 26.0 | |
| March 22, 2019, 1 a.m. | 22.9 ppb (21) | 11.1 ppb (10) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 22, 2019, midnight | 22.8 ppb (21) | 13.3 ppb (12) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| March 21, 2019, 11 p.m. | 27.0 ppb (25) | 14.2 ppb (13) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 25.0 | |
| March 21, 2019, 10 p.m. | 30.7 ppb (28) | 17.0 ppb (16) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 28.0 | |
| March 21, 2019, 9 p.m. | 39.3 ppb (36) | 24.1 ppb (22) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 21, 2019, 8 p.m. | 34.3 ppb (32) | 19.6 ppb (18) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 21, 2019, 7 p.m. | 39.2 ppb (36) | 23.0 ppb (21) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 36.0 | |
| March 21, 2019, 6 p.m. | 36.2 ppb (34) | 19.5 ppb (18) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 34.0 | |
| March 21, 2019, 5 p.m. | 40.5 ppb (38) | 22.7 ppb (21) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 38.0 | |
| March 21, 2019, 4 p.m. | 36.2 ppb (34) | 20.0 ppb (19) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 34.0 | |
| March 21, 2019, 3 p.m. | 45.8 ppb (42) | 24.7 ppb (23) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 42.0 | |
| March 21, 2019, 2 p.m. | 48.0 ppb (44) | 24.8 ppb (23) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 44.0 | |
| March 21, 2019, 1 p.m. | 53.5 ppb (50) | 27.2 ppb (25) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 50.0 | |
| March 21, 2019, noon | 53.3 ppb (49) | 24.5 ppb (23) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| March 21, 2019, 11 a.m. | 58.1 ppb (54) | 27.0 ppb (25) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 54.0 | |
| March 21, 2019, 10 a.m. | 34.6 ppb (32) | 9.4 ppb (9) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 32.0 | |
| March 21, 2019, 9 a.m. | 30.8 ppb (29) | 7.5 ppb (7) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 21, 2019, 8 a.m. | 37.6 ppb (35) | 6.5 ppb (6) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| March 21, 2019, 7 a.m. | 21.8 ppb (20) | 0.6 ppb (1) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 20.0 | |
| March 21, 2019, 6 a.m. | 28.5 ppb (26) | 6.9 ppb (6) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 26.0 | |
| March 21, 2019, 5 a.m. | 26.5 ppb (25) | 7.0 ppb (6) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 25.0 | |
| March 21, 2019, 4 a.m. | 40.3 ppb (37) | 12.9 ppb (12) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 37.0 | |
| March 21, 2019, 3 a.m. | 47.3 ppb (44) | 13.8 ppb (13) | N/A | 34.0 ppb (31) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 44.0 | |
| March 21, 2019, 2 a.m. | 11.4 ppb (11) | 0.9 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| March 21, 2019, 1 a.m. | 34.0 ppb (31) | 4.9 ppb (5) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 31.0 | |
| March 21, 2019, midnight | 34.7 ppb (32) | 10.2 ppb (9) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 32.0 | |
| March 20, 2019, 11 p.m. | 43.1 ppb (40) | 18.3 ppb (17) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 40.0 | |
| March 20, 2019, 10 p.m. | 48.6 ppb (45) | 22.6 ppb (21) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 45.0 | |
| March 20, 2019, 9 p.m. | 50.5 ppb (47) | 23.6 ppb (22) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 47.0 | |
| March 20, 2019, 8 p.m. | 42.1 ppb (39) | 19.8 ppb (18) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 39.0 | |
| March 20, 2019, 7 p.m. | 48.1 ppb (45) | 21.1 ppb (20) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| March 20, 2019, 6 p.m. | 57.6 ppb (54) | 25.5 ppb (24) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 54.0 | |
| March 20, 2019, 5 p.m. | 80.4 ppb (78) | 42.9 ppb (40) | N/A | 38.0 ppb (35) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 78.0 | |
| March 20, 2019, 4 p.m. | 146.9 ppb (109) | 106.6 ppb (101) | N/A | 40.0 ppb (37) | N/A | N/A | N/A | N/A | N/A | 17.0 μg/m3 (61) | 109.0 | |
| March 20, 2019, 3 p.m. | 197.4 ppb (119) | 155.1 ppb (110) | N/A | 42.0 ppb (39) | N/A | N/A | N/A | N/A | N/A | 23.0 μg/m3 (73) | 119.0 | |
| March 20, 2019, 2 p.m. | 167.8 ppb (113) | 127.2 ppb (105) | N/A | 40.0 ppb (37) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 113.0 | |
| March 20, 2019, 1 p.m. | 184.5 ppb (116) | 143.6 ppb (108) | N/A | 41.0 ppb (38) | N/A | N/A | N/A | N/A | N/A | 15.0 μg/m3 (56) | 116.0 | |
| March 20, 2019, noon | 135.1 ppb (107) | 91.8 ppb (90) | N/A | 43.0 ppb (40) | N/A | N/A | N/A | N/A | N/A | 7.0 μg/m3 (29) | 107.0 | |
| March 20, 2019, 11 a.m. | 101.7 ppb (100) | 59.2 ppb (56) | N/A | 42.0 ppb (39) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 100.0 | |
| March 20, 2019, 10 a.m. | 58.3 ppb (55) | 19.7 ppb (18) | N/A | 39.0 ppb (36) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 55.0 | |
| March 20, 2019, 9 a.m. | 52.6 ppb (49) | 18.7 ppb (17) | N/A | 34.0 ppb (31) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 49.0 | |
| March 20, 2019, 8 a.m. | 54.3 ppb (50) | 16.7 ppb (15) | N/A | 38.0 ppb (35) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 50.0 | |
| March 20, 2019, 7 a.m. | 39.3 ppb (36) | 6.1 ppb (6) | N/A | 33.0 ppb (31) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 36.0 | |
| March 20, 2019, 6 a.m. | 8.0 ppb (7) | 1.9 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | -1.0 μg/m3 (0) | 7.0 | |
| March 20, 2019, 5 a.m. | 4.9 ppb (5) | 0.4 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 5.0 | |
| March 20, 2019, 4 a.m. | 4.1 ppb (4) | 0.2 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 4.0 | |
| March 20, 2019, 3 a.m. | 7.1 ppb (7) | 0.9 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 8.0 | |
| March 20, 2019, 2 a.m. | 22.1 ppb (20) | 2.5 ppb (2) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 1.0 μg/m3 (4) | 20.0 | |
| March 20, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | N/A | |
| March 20, 2019, midnight | 22.2 ppb (21) | 5.7 ppb (5) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 21.0 | |
| March 19, 2019, 11 p.m. | 37.4 ppb (35) | 14.3 ppb (13) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 35.0 | |
| March 19, 2019, 10 p.m. | 28.8 ppb (27) | 11.4 ppb (11) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 27.0 | |
| March 19, 2019, 9 p.m. | 28.0 ppb (26) | 11.0 ppb (10) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | N/A | N/A | 0.0 μg/m3 (0) | 26.0 | |
| March 19, 2019, 8 p.m. | 32.0 ppb (30) | 13.7 ppb (13) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | N/A | N/A | 3.0 μg/m3 (12) | 30.0 | |
| March 19, 2019, 7 p.m. | 42.6 ppb (39) | 21.6 ppb (20) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 39.0 | |
| March 19, 2019, 6 p.m. | 65.4 ppb (62) | 35.7 ppb (33) | N/A | 30.0 ppb (28) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 62.0 | |
| March 19, 2019, 5 p.m. | 135.3 ppb (107) | 89.2 ppb (87) | N/A | 46.0 ppb (43) | N/A | N/A | N/A | N/A | N/A | 15.0 μg/m3 (56) | 107.0 | |
| March 19, 2019, 4 p.m. | 199.8 ppb (119) | 153.5 ppb (110) | N/A | 46.0 ppb (43) | N/A | N/A | N/A | N/A | N/A | 23.0 μg/m3 (73) | 119.0 | |
| March 19, 2019, 3 p.m. | 187.7 ppb (117) | 147.8 ppb (109) | N/A | 40.0 ppb (37) | N/A | N/A | N/A | N/A | N/A | 15.0 μg/m3 (56) | 117.0 |