Portland OR, US: 45.496641, -122.602877
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 23, 2019, 2 a.m. | 8.5 ppb (8) | 1.2 ppb (1) | N/A | 7.0 ppb (6) | N/A | 0.0 ppb (0) | 25.0 ppb (19) | 0.2 ppb (2) | N/A | 5.8 μg/m3 (24) | 24.0 | |
| March 23, 2019, 1 a.m. | 9.5 ppb (9) | 1.4 ppb (1) | N/A | 8.0 ppb (7) | N/A | 0.0 ppb (0) | 25.0 ppb (19) | 0.2 ppb (2) | N/A | 6.7 μg/m3 (28) | 28.0 | |
| March 23, 2019, midnight | 9.0 ppb (8) | 1.8 ppb (2) | N/A | 7.0 ppb (6) | N/A | 0.0 ppb (0) | 30.0 ppb (23) | 0.2 ppb (2) | N/A | 7.3 μg/m3 (30) | 30.0 | |
| March 22, 2019, 11 p.m. | 12.2 ppb (11) | 2.7 ppb (3) | N/A | 10.0 ppb (9) | N/A | 0.0 ppb (0) | 26.0 ppb (20) | 0.2 ppb (2) | N/A | 13.2 μg/m3 (53) | 53.0 | |
| March 22, 2019, 10 p.m. | 16.2 ppb (15) | 3.4 ppb (3) | N/A | 13.0 ppb (12) | N/A | 0.0 ppb (0) | 20.0 ppb (15) | 0.2 ppb (2) | N/A | 15.5 μg/m3 (57) | 57.0 | |
| March 22, 2019, 9 p.m. | 16.0 ppb (15) | 3.8 ppb (4) | N/A | 12.0 ppb (11) | N/A | 0.0 ppb (0) | 18.0 ppb (14) | 0.2 ppb (2) | N/A | 10.4 μg/m3 (43) | 43.0 | |
| March 22, 2019, 8 p.m. | 14.4 ppb (13) | 4.3 ppb (4) | N/A | 10.0 ppb (9) | N/A | 0.0 ppb (0) | 17.0 ppb (13) | 0.2 ppb (2) | N/A | 8.4 μg/m3 (35) | 35.0 | |
| March 22, 2019, 7 p.m. | 15.2 ppb (14) | 5.5 ppb (5) | N/A | 10.0 ppb (9) | N/A | 0.0 ppb (0) | 13.0 ppb (10) | 0.2 ppb (2) | N/A | 7.1 μg/m3 (30) | 30.0 | |
| March 22, 2019, 6 p.m. | 21.7 ppb (20) | 7.8 ppb (7) | N/A | 14.0 ppb (13) | N/A | 0.0 ppb (0) | 11.0 ppb (8) | 0.2 ppb (2) | N/A | 5.6 μg/m3 (23) | 23.0 | |
| March 22, 2019, 5 p.m. | 21.7 ppb (20) | 10.2 ppb (9) | N/A | 11.0 ppb (10) | N/A | N/A | 15.0 ppb (12) | 0.2 ppb (2) | N/A | 5.2 μg/m3 (22) | 22.0 | |
| March 22, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 6.0 ppb (5) | 0.4 ppb (4) | N/A | 7.9 μg/m3 (33) | 33.0 | |
| March 22, 2019, 3 p.m. | 74.9 ppb (72) | 56.0 ppb (52) | N/A | 19.0 ppb (18) | N/A | 1.0 ppb (1) | 2.0 ppb (2) | 0.6 ppb (7) | N/A | 10.2 μg/m3 (42) | 72.0 | |
| March 22, 2019, 2 p.m. | 94.6 ppb (93) | 79.0 ppb (77) | N/A | 16.0 ppb (15) | N/A | 2.0 ppb (3) | 2.0 ppb (2) | 0.9 ppb (10) | N/A | 14.7 μg/m3 (56) | 93.0 | |
| March 22, 2019, 1 p.m. | 71.4 ppb (69) | 56.0 ppb (52) | N/A | 15.0 ppb (14) | N/A | 1.0 ppb (1) | 1.0 ppb (1) | 0.6 ppb (7) | N/A | 11.3 μg/m3 (47) | 69.0 | |
| March 22, 2019, noon | 58.0 ppb (54) | 42.5 ppb (39) | N/A | 15.0 ppb (14) | N/A | 1.0 ppb (1) | 1.0 ppb (1) | 0.6 ppb (7) | N/A | 12.0 μg/m3 (50) | 54.0 | |
| March 22, 2019, 11 a.m. | 40.2 ppb (37) | 23.4 ppb (22) | N/A | 17.0 ppb (16) | N/A | 1.0 ppb (1) | 1.0 ppb (1) | 0.4 ppb (4) | N/A | 11.3 μg/m3 (47) | 47.0 | |
| March 22, 2019, 10 a.m. | 39.1 ppb (36) | 22.3 ppb (21) | N/A | 17.0 ppb (16) | N/A | 1.0 ppb (1) | 1.0 ppb (1) | 0.4 ppb (4) | N/A | 12.7 μg/m3 (51) | 51.0 | |
| March 22, 2019, 9 a.m. | 38.3 ppb (35) | 21.2 ppb (20) | N/A | 17.0 ppb (16) | N/A | 1.0 ppb (1) | 1.0 ppb (1) | 0.5 ppb (6) | N/A | 13.8 μg/m3 (54) | 54.0 | |
| March 22, 2019, 8 a.m. | 29.9 ppb (28) | 9.9 ppb (9) | N/A | 20.0 ppb (19) | N/A | 0.0 ppb (0) | 1.0 ppb (1) | 0.4 ppb (4) | N/A | 13.6 μg/m3 (53) | 53.0 | |
| March 22, 2019, 7 a.m. | 28.7 ppb (27) | 6.4 ppb (6) | N/A | 22.0 ppb (20) | N/A | 0.0 ppb (0) | 2.0 ppb (2) | 0.4 ppb (4) | N/A | 14.9 μg/m3 (56) | 56.0 | |
| March 22, 2019, 6 a.m. | 23.1 ppb (21) | 2.6 ppb (2) | N/A | 21.0 ppb (19) | N/A | 0.0 ppb (0) | 7.0 ppb (5) | 0.3 ppb (3) | N/A | 15.4 μg/m3 (57) | 57.0 | |
| March 22, 2019, 5 a.m. | 13.5 ppb (12) | 1.0 ppb (1) | N/A | 13.0 ppb (12) | N/A | 0.0 ppb (0) | 20.0 ppb (15) | 0.2 ppb (2) | N/A | 10.6 μg/m3 (44) | 44.0 | |
| March 22, 2019, 4 a.m. | 10.7 ppb (10) | 1.3 ppb (1) | N/A | 9.0 ppb (8) | N/A | 0.0 ppb (0) | 29.0 ppb (22) | 0.2 ppb (2) | N/A | 7.5 μg/m3 (31) | 31.0 | |
| March 22, 2019, 3 a.m. | 8.9 ppb (8) | 1.0 ppb (1) | N/A | 8.0 ppb (7) | N/A | 0.0 ppb (0) | 34.0 ppb (26) | 0.1 ppb (1) | N/A | 6.3 μg/m3 (26) | 26.0 | |
| March 22, 2019, 2 a.m. | 9.6 ppb (9) | 1.2 ppb (1) | N/A | 8.0 ppb (7) | N/A | 0.0 ppb (0) | 34.0 ppb (26) | 0.1 ppb (1) | N/A | 5.2 μg/m3 (22) | 26.0 | |
| March 22, 2019, 1 a.m. | 9.0 ppb (8) | 1.3 ppb (1) | N/A | 8.0 ppb (7) | N/A | 0.0 ppb (0) | 38.0 ppb (29) | 0.1 ppb (1) | N/A | 4.7 μg/m3 (20) | 29.0 | |
| March 22, 2019, midnight | 8.7 ppb (8) | 1.6 ppb (1) | N/A | 7.0 ppb (6) | N/A | 0.0 ppb (0) | 39.0 ppb (30) | 0.1 ppb (1) | N/A | 5.0 μg/m3 (21) | 30.0 | |
| March 21, 2019, 11 p.m. | 7.4 ppb (7) | 1.5 ppb (1) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | 40.0 ppb (31) | 0.1 ppb (1) | N/A | 4.8 μg/m3 (20) | 31.0 | |
| March 21, 2019, 10 p.m. | 6.4 ppb (6) | 1.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 41.0 ppb (32) | 0.1 ppb (1) | N/A | 3.8 μg/m3 (16) | 32.0 | |
| March 21, 2019, 9 p.m. | 7.0 ppb (6) | 1.7 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 40.0 ppb (31) | 0.1 ppb (1) | N/A | 3.9 μg/m3 (16) | 31.0 | |
| March 21, 2019, 8 p.m. | 6.4 ppb (6) | 1.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 41.0 ppb (32) | 0.1 ppb (1) | N/A | 3.5 μg/m3 (15) | 32.0 | |
| March 21, 2019, 7 p.m. | 8.0 ppb (7) | 1.8 ppb (2) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.1 ppb (1) | N/A | 4.7 μg/m3 (20) | 28.0 | |
| March 21, 2019, 6 p.m. | 9.9 ppb (9) | 2.3 ppb (2) | N/A | 8.0 ppb (7) | N/A | 0.0 ppb (0) | 34.0 ppb (26) | 0.1 ppb (1) | N/A | 5.6 μg/m3 (23) | 26.0 | |
| March 21, 2019, 5 p.m. | 12.2 ppb (11) | 2.5 ppb (2) | N/A | 10.0 ppb (9) | N/A | 0.0 ppb (0) | 30.0 ppb (23) | 0.2 ppb (2) | N/A | 6.2 μg/m3 (26) | 26.0 | |
| March 21, 2019, 4 p.m. | 14.6 ppb (14) | 2.7 ppb (3) | N/A | 12.0 ppb (11) | N/A | 0.0 ppb (0) | 27.0 ppb (21) | 0.2 ppb (2) | N/A | 5.9 μg/m3 (25) | 25.0 | |
| March 21, 2019, 3 p.m. | 14.6 ppb (14) | 1.8 ppb (2) | N/A | 13.0 ppb (12) | N/A | 0.0 ppb (0) | 26.0 ppb (20) | 0.2 ppb (2) | N/A | 5.4 μg/m3 (23) | 23.0 | |
| March 21, 2019, 2 p.m. | 13.8 ppb (13) | 1.1 ppb (1) | N/A | 13.0 ppb (12) | N/A | 0.0 ppb (0) | 24.0 ppb (18) | 0.2 ppb (2) | N/A | 4.6 μg/m3 (19) | 19.0 | |
| March 21, 2019, 1 p.m. | 6.0 ppb (6) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 35.0 ppb (27) | 0.1 ppb (1) | N/A | 4.1 μg/m3 (17) | 27.0 | |
| March 21, 2019, noon | 4.9 ppb (5) | 0.9 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 38.0 ppb (29) | 0.1 ppb (1) | N/A | 4.2 μg/m3 (18) | 29.0 | |
| March 21, 2019, 11 a.m. | 4.3 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.1 ppb (1) | N/A | 4.3 μg/m3 (18) | 28.0 | |
| March 21, 2019, 10 a.m. | 4.8 ppb (4) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 37.0 ppb (28) | 0.1 ppb (1) | N/A | 4.8 μg/m3 (20) | 28.0 | |
| March 21, 2019, 9 a.m. | 5.6 ppb (5) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 36.0 ppb (28) | 0.1 ppb (1) | N/A | 5.5 μg/m3 (23) | 28.0 | |
| March 21, 2019, 8 a.m. | 10.9 ppb (10) | 1.2 ppb (1) | N/A | 10.0 ppb (9) | N/A | 0.0 ppb (0) | 29.0 ppb (22) | 0.1 ppb (1) | N/A | 6.3 μg/m3 (26) | 26.0 | |
| March 21, 2019, 7 a.m. | 11.0 ppb (10) | 1.1 ppb (1) | N/A | 10.0 ppb (9) | N/A | 0.0 ppb (0) | 31.0 ppb (24) | 0.2 ppb (2) | N/A | 5.6 μg/m3 (23) | 24.0 | |
| March 21, 2019, 6 a.m. | 7.3 ppb (7) | 0.9 ppb (1) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | 42.0 ppb (32) | 0.1 ppb (1) | N/A | 4.4 μg/m3 (18) | 32.0 | |
| March 21, 2019, 5 a.m. | 8.6 ppb (8) | 0.9 ppb (1) | N/A | 8.0 ppb (7) | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.1 ppb (1) | N/A | 4.3 μg/m3 (18) | 33.0 | |
| March 21, 2019, 4 a.m. | 8.6 ppb (8) | 0.9 ppb (1) | N/A | 8.0 ppb (7) | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.1 ppb (1) | N/A | 4.4 μg/m3 (18) | 35.0 | |
| March 21, 2019, 3 a.m. | 9.7 ppb (9) | 1.0 ppb (1) | N/A | 9.0 ppb (8) | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.2 ppb (2) | N/A | 5.5 μg/m3 (23) | 35.0 | |
| March 21, 2019, 2 a.m. | 7.7 ppb (7) | 1.1 ppb (1) | N/A | 7.0 ppb (6) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 3.7 μg/m3 (15) | 38.0 | |
| March 21, 2019, 1 a.m. | 7.3 ppb (7) | 1.4 ppb (1) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | 52.0 ppb (40) | 0.1 ppb (1) | N/A | 3.3 μg/m3 (14) | 40.0 | |
| March 21, 2019, midnight | 7.3 ppb (7) | 1.5 ppb (1) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | 51.0 ppb (39) | 0.1 ppb (1) | N/A | 3.2 μg/m3 (13) | 39.0 | |
| March 20, 2019, 11 p.m. | 6.9 ppb (6) | 1.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 52.0 ppb (40) | 0.1 ppb (1) | N/A | 3.0 μg/m3 (12) | 40.0 | |
| March 20, 2019, 10 p.m. | 6.6 ppb (6) | 1.7 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 53.0 ppb (41) | 0.1 ppb (1) | N/A | 2.9 μg/m3 (12) | 41.0 | |
| March 20, 2019, 9 p.m. | 6.4 ppb (6) | 1.7 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 53.0 ppb (41) | 0.1 ppb (1) | N/A | 2.8 μg/m3 (12) | 41.0 | |
| March 20, 2019, 8 p.m. | 6.2 ppb (6) | 1.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 53.0 ppb (41) | 0.1 ppb (1) | N/A | 2.8 μg/m3 (12) | 41.0 | |
| March 20, 2019, 7 p.m. | 6.3 ppb (6) | 1.7 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 51.0 ppb (39) | 0.1 ppb (1) | N/A | 3.0 μg/m3 (12) | 39.0 | |
| March 20, 2019, 6 p.m. | 6.5 ppb (6) | 1.8 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 50.0 ppb (38) | 0.1 ppb (1) | N/A | 3.0 μg/m3 (12) | 38.0 | |
| March 20, 2019, 5 p.m. | 6.5 ppb (6) | 1.7 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.1 ppb (1) | N/A | 3.3 μg/m3 (14) | 36.0 | |
| March 20, 2019, 4 p.m. | 7.7 ppb (7) | 1.9 ppb (2) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.1 ppb (1) | N/A | 3.8 μg/m3 (16) | 35.0 | |
| March 20, 2019, 3 p.m. | 8.6 ppb (8) | 1.7 ppb (2) | N/A | 7.0 ppb (6) | N/A | 0.0 ppb (0) | 42.0 ppb (32) | 0.1 ppb (1) | N/A | 5.4 μg/m3 (23) | 32.0 | |
| March 20, 2019, 2 p.m. | 8.2 ppb (8) | 1.2 ppb (1) | N/A | 7.0 ppb (6) | N/A | 0.0 ppb (0) | 43.0 ppb (33) | 0.1 ppb (1) | N/A | 5.8 μg/m3 (24) | 33.0 | |
| March 20, 2019, 1 p.m. | 6.3 ppb (6) | 1.3 ppb (1) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 46.0 ppb (35) | 0.1 ppb (1) | N/A | 5.0 μg/m3 (21) | 35.0 | |
| March 20, 2019, noon | 5.1 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.1 ppb (1) | N/A | 4.6 μg/m3 (19) | 37.0 | |
| March 20, 2019, 11 a.m. | 4.7 ppb (4) | 1.1 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.1 ppb (1) | N/A | 4.3 μg/m3 (18) | 37.0 | |
| March 20, 2019, 10 a.m. | 4.2 ppb (4) | 0.9 ppb (1) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 4.4 μg/m3 (18) | 38.0 | |
| March 20, 2019, 9 a.m. | 4.4 ppb (4) | 1.2 ppb (1) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 4.4 μg/m3 (18) | 38.0 | |
| March 20, 2019, 8 a.m. | 4.1 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 3.8 μg/m3 (16) | 38.0 | |
| March 20, 2019, 7 a.m. | 4.3 ppb (4) | 1.1 ppb (1) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 50.0 ppb (38) | 0.1 ppb (1) | N/A | 3.8 μg/m3 (16) | 38.0 | |
| March 20, 2019, 6 a.m. | 4.5 ppb (4) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 3.6 μg/m3 (15) | 38.0 | |
| March 20, 2019, 5 a.m. | 5.1 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 50.0 ppb (38) | 0.1 ppb (1) | N/A | 3.7 μg/m3 (15) | 38.0 | |
| March 20, 2019, 4 a.m. | 5.2 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 3.5 μg/m3 (15) | 38.0 | |
| March 20, 2019, 3 a.m. | 5.5 ppb (5) | 1.1 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 3.5 μg/m3 (15) | 38.0 | |
| March 20, 2019, 2 a.m. | 5.5 ppb (5) | 1.0 ppb (1) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 50.0 ppb (38) | 0.1 ppb (1) | N/A | 3.3 μg/m3 (14) | 38.0 | |
| March 20, 2019, 1 a.m. | 5.8 ppb (5) | 1.3 ppb (1) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 3.2 μg/m3 (13) | 38.0 | |
| March 20, 2019, midnight | 5.9 ppb (5) | 1.5 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 3.1 μg/m3 (13) | 38.0 | |
| March 19, 2019, 11 p.m. | 6.2 ppb (6) | 1.7 ppb (2) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.1 ppb (1) | N/A | 3.1 μg/m3 (13) | 37.0 | |
| March 19, 2019, 10 p.m. | 6.6 ppb (6) | 1.8 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.1 ppb (1) | N/A | 3.2 μg/m3 (13) | 36.0 | |
| March 19, 2019, 9 p.m. | 6.3 ppb (6) | 1.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.1 ppb (1) | N/A | 3.4 μg/m3 (14) | 36.0 | |
| March 19, 2019, 8 p.m. | 6.2 ppb (6) | 1.8 ppb (2) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.1 ppb (1) | N/A | 3.5 μg/m3 (15) | 36.0 | |
| March 19, 2019, 7 p.m. | 6.2 ppb (6) | 1.8 ppb (2) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 46.0 ppb (35) | 0.1 ppb (1) | N/A | 3.7 μg/m3 (15) | 35.0 | |
| March 19, 2019, 6 p.m. | 6.6 ppb (6) | 2.0 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.1 ppb (1) | N/A | 3.9 μg/m3 (16) | 35.0 | |
| March 19, 2019, 5 p.m. | 6.7 ppb (6) | 1.9 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.1 ppb (1) | N/A | 4.2 μg/m3 (18) | 34.0 | |
| March 19, 2019, 4 p.m. | 7.2 ppb (7) | 2.0 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.1 ppb (1) | N/A | 4.3 μg/m3 (18) | 34.0 | |
| March 19, 2019, 3 p.m. | 7.8 ppb (7) | 1.8 ppb (2) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.1 ppb (1) | N/A | 4.5 μg/m3 (19) | 34.0 | |
| March 19, 2019, 2 p.m. | 7.3 ppb (7) | 1.4 ppb (1) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | 44.0 ppb (34) | 0.1 ppb (1) | N/A | 4.6 μg/m3 (19) | 34.0 | |
| March 19, 2019, 1 p.m. | 6.4 ppb (6) | 1.2 ppb (1) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.1 ppb (1) | N/A | 4.8 μg/m3 (20) | 35.0 | |
| March 19, 2019, noon | 5.7 ppb (5) | 1.3 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 45.0 ppb (35) | 0.1 ppb (1) | N/A | 4.8 μg/m3 (20) | 35.0 | |
| March 19, 2019, 11 a.m. | 4.8 ppb (4) | 1.1 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.1 ppb (1) | N/A | 4.3 μg/m3 (18) | 36.0 | |
| March 19, 2019, 10 a.m. | 4.4 ppb (4) | 1.1 ppb (1) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.1 ppb (1) | N/A | 4.1 μg/m3 (17) | 36.0 | |
| March 19, 2019, 9 a.m. | 4.2 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.1 ppb (1) | N/A | 4.3 μg/m3 (18) | 37.0 | |
| March 19, 2019, 8 a.m. | 4.6 ppb (4) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.1 ppb (1) | N/A | 4.5 μg/m3 (19) | 37.0 | |
| March 19, 2019, 7 a.m. | 4.3 ppb (4) | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 4.3 μg/m3 (18) | 38.0 | |
| March 19, 2019, 6 a.m. | 4.4 ppb (4) | 1.1 ppb (1) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 3.7 μg/m3 (15) | 38.0 | |
| March 19, 2019, 5 a.m. | 4.4 ppb (4) | 0.9 ppb (1) | N/A | 3.0 ppb (3) | N/A | 0.0 ppb (0) | 50.0 ppb (38) | 0.1 ppb (1) | N/A | 3.5 μg/m3 (15) | 38.0 | |
| March 19, 2019, 4 a.m. | 4.9 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 3.3 μg/m3 (14) | 38.0 | |
| March 19, 2019, 3 a.m. | 5.3 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 3.1 μg/m3 (13) | 38.0 | |
| March 19, 2019, 2 a.m. | 6.7 ppb (6) | 1.1 ppb (1) | N/A | 6.0 ppb (6) | N/A | 0.0 ppb (0) | 46.0 ppb (35) | 0.1 ppb (1) | N/A | 3.0 μg/m3 (12) | 35.0 | |
| March 19, 2019, 1 a.m. | 5.4 ppb (5) | 1.2 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.1 ppb (1) | N/A | 2.7 μg/m3 (11) | 37.0 | |
| March 19, 2019, midnight | 5.9 ppb (5) | 1.5 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.1 ppb (1) | N/A | 2.7 μg/m3 (11) | 37.0 | |
| March 18, 2019, 11 p.m. | 5.6 ppb (5) | 1.6 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.1 ppb (1) | N/A | 2.7 μg/m3 (11) | 37.0 | |
| March 18, 2019, 10 p.m. | 5.8 ppb (5) | 1.6 ppb (1) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 2.8 μg/m3 (12) | 38.0 | |
| March 18, 2019, 9 p.m. | 6.0 ppb (6) | 1.7 ppb (2) | N/A | 4.0 ppb (4) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 2.8 μg/m3 (12) | 38.0 | |
| March 18, 2019, 8 p.m. | 6.6 ppb (6) | 1.9 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 49.0 ppb (38) | 0.1 ppb (1) | N/A | 2.9 μg/m3 (12) | 38.0 | |
| March 18, 2019, 7 p.m. | 6.6 ppb (6) | 1.9 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 48.0 ppb (37) | 0.1 ppb (1) | N/A | 2.9 μg/m3 (12) | 37.0 | |
| March 18, 2019, 6 p.m. | 7.0 ppb (6) | 2.1 ppb (2) | N/A | 5.0 ppb (5) | N/A | 0.0 ppb (0) | 47.0 ppb (36) | 0.1 ppb (1) | N/A | N/A | 36.0 | |
| March 18, 2019, 5 p.m. | 7.3 ppb (7) | 2.0 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | 46.0 ppb (35) | 0.1 ppb (1) | N/A | N/A | 35.0 | |
| March 18, 2019, 4 p.m. | 7.6 ppb (7) | 1.9 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | 45.0 ppb (35) | 0.1 ppb (1) | N/A | N/A | 35.0 | |
| March 18, 2019, 3 p.m. | 9.1 ppb (8) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | 44.0 ppb (34) | 0.1 ppb (1) | N/A | N/A | 34.0 | |
| March 16, 2019, 2 p.m. | 8.1 ppb (8) | 1.4 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 39.0 ppb (30) | 0.1 ppb (1) | N/A | N/A | 30.0 | |
| March 16, 2019, 1 p.m. | 6.6 ppb (6) | 1.3 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 41.0 ppb (32) | 0.1 ppb (1) | N/A | N/A | 32.0 | |
| March 16, 2019, noon | 5.8 ppb (5) | 1.2 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 42.0 ppb (32) | 0.1 ppb (1) | N/A | N/A | 32.0 | |
| March 16, 2019, 11 a.m. | 6.0 ppb (6) | 1.3 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | N/A | 6.0 | |
| March 16, 2019, 10 a.m. | 5.8 ppb (5) | 1.2 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 43.0 ppb (33) | 0.1 ppb (1) | N/A | N/A | 33.0 | |
| March 16, 2019, 9 a.m. | 5.3 ppb (5) | 1.2 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | 44.0 ppb (34) | 0.1 ppb (1) | N/A | N/A | 34.0 | |
| March 16, 2019, 8 a.m. | 4.9 ppb (5) | 1.1 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | 44.0 ppb (34) | 0.1 ppb (1) | N/A | N/A | 34.0 | |
| March 16, 2019, 7 a.m. | 5.2 ppb (5) | 1.2 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | 44.0 ppb (34) | 0.1 ppb (1) | N/A | N/A | 34.0 | |
| March 16, 2019, 6 a.m. | 5.4 ppb (5) | 1.2 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | 44.0 ppb (34) | 0.1 ppb (1) | N/A | N/A | 34.0 | |
| March 16, 2019, 5 a.m. | 5.7 ppb (5) | 1.2 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 43.0 ppb (33) | 0.1 ppb (1) | N/A | N/A | 33.0 | |
| March 16, 2019, 4 a.m. | 6.8 ppb (6) | 1.1 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | 40.0 ppb (31) | 0.1 ppb (1) | N/A | N/A | 31.0 | |
| March 16, 2019, 3 a.m. | 8.2 ppb (8) | 1.3 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 39.0 ppb (30) | 0.2 ppb (2) | N/A | N/A | 30.0 | |
| March 16, 2019, 2 a.m. | 10.3 ppb (10) | 1.9 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | 37.0 ppb (28) | 0.2 ppb (2) | N/A | N/A | 28.0 | |
| March 16, 2019, 1 a.m. | 13.2 ppb (12) | 2.4 ppb (2) | N/A | 11.0 ppb (10) | N/A | N/A | 35.0 ppb (27) | 0.2 ppb (2) | N/A | N/A | 27.0 | |
| March 16, 2019, midnight | 18.9 ppb (18) | 4.0 ppb (4) | N/A | 15.0 ppb (14) | N/A | N/A | 31.0 ppb (24) | 0.2 ppb (2) | N/A | N/A | 24.0 | |
| March 15, 2019, 11 p.m. | 20.1 ppb (19) | 5.4 ppb (5) | N/A | 15.0 ppb (14) | N/A | N/A | 29.0 ppb (22) | 0.2 ppb (2) | N/A | N/A | 22.0 | |
| March 15, 2019, 10 p.m. | 14.7 ppb (14) | 4.2 ppb (4) | N/A | 11.0 ppb (10) | N/A | N/A | 31.0 ppb (24) | 0.2 ppb (2) | N/A | N/A | 24.0 | |
| March 15, 2019, 9 p.m. | 13.5 ppb (12) | 4.5 ppb (4) | N/A | 9.0 ppb (8) | N/A | N/A | 32.0 ppb (25) | 0.2 ppb (2) | N/A | N/A | 25.0 | |
| March 15, 2019, 8 p.m. | 15.6 ppb (14) | 5.6 ppb (5) | N/A | 10.0 ppb (9) | N/A | N/A | 30.0 ppb (23) | 0.2 ppb (2) | N/A | N/A | 23.0 | |
| March 15, 2019, 7 p.m. | 16.6 ppb (15) | 6.5 ppb (6) | N/A | 10.0 ppb (9) | N/A | N/A | 28.0 ppb (22) | 0.2 ppb (2) | N/A | N/A | 22.0 | |
| March 15, 2019, 6 p.m. | 17.7 ppb (16) | 7.1 ppb (7) | N/A | 11.0 ppb (10) | N/A | N/A | 25.0 ppb (19) | 0.2 ppb (2) | N/A | N/A | 19.0 | |
| March 15, 2019, 5 p.m. | 21.5 ppb (20) | 9.0 ppb (8) | N/A | 13.0 ppb (12) | N/A | N/A | 19.0 ppb (15) | 0.2 ppb (2) | N/A | N/A | 20.0 | |
| March 15, 2019, 4 p.m. | 22.5 ppb (21) | 8.3 ppb (8) | N/A | 14.0 ppb (13) | N/A | N/A | 17.0 ppb (13) | 0.2 ppb (2) | N/A | N/A | 21.0 | |
| March 15, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | N/A | N/A | 12.0 | |
| March 15, 2019, 2 p.m. | 29.5 ppb (27) | 6.3 ppb (6) | N/A | 23.0 ppb (21) | N/A | N/A | 11.0 ppb (8) | 0.3 ppb (3) | N/A | N/A | 27.0 | |
| March 15, 2019, 1 p.m. | 14.6 ppb (14) | 2.0 ppb (2) | N/A | 13.0 ppb (12) | N/A | N/A | 21.0 ppb (16) | 0.2 ppb (2) | N/A | N/A | 16.0 | |
| March 15, 2019, noon | 17.5 ppb (16) | 1.7 ppb (2) | N/A | 16.0 ppb (15) | N/A | N/A | 16.0 ppb (12) | 0.2 ppb (2) | N/A | N/A | 16.0 | |
| March 15, 2019, 11 a.m. | 12.4 ppb (11) | 1.4 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | 22.0 ppb (17) | 0.1 ppb (1) | N/A | N/A | 17.0 | |
| March 15, 2019, 10 a.m. | 7.3 ppb (7) | 1.2 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | 30.0 ppb (23) | 0.1 ppb (1) | N/A | N/A | 23.0 | |
| March 15, 2019, 9 a.m. | 7.3 ppb (7) | 1.3 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | 31.0 ppb (24) | 0.1 ppb (1) | N/A | N/A | 24.0 | |
| March 15, 2019, 8 a.m. | 6.7 ppb (6) | 1.2 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 33.0 ppb (25) | 0.1 ppb (1) | N/A | N/A | 25.0 | |
| March 15, 2019, 7 a.m. | 7.7 ppb (7) | 1.3 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | 32.0 ppb (25) | 0.1 ppb (1) | N/A | N/A | 25.0 | |
| March 15, 2019, 6 a.m. | 7.6 ppb (7) | 1.1 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | 31.0 ppb (24) | 0.1 ppb (1) | N/A | N/A | 24.0 | |
| March 15, 2019, 5 a.m. | 9.3 ppb (9) | 1.4 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | 31.0 ppb (24) | 0.2 ppb (2) | N/A | N/A | 24.0 | |
| March 15, 2019, 4 a.m. | 9.9 ppb (9) | 1.3 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | 30.0 ppb (23) | 0.2 ppb (2) | N/A | N/A | 23.0 | |
| March 15, 2019, 3 a.m. | 10.0 ppb (9) | 1.3 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | 32.0 ppb (25) | 0.2 ppb (2) | N/A | N/A | 25.0 | |
| March 15, 2019, 2 a.m. | 12.4 ppb (11) | 1.5 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | 30.0 ppb (23) | 0.2 ppb (2) | N/A | N/A | 23.0 | |
| March 15, 2019, 1 a.m. | 16.9 ppb (16) | 2.0 ppb (2) | N/A | 15.0 ppb (14) | N/A | N/A | 27.0 ppb (21) | 0.2 ppb (2) | N/A | N/A | 21.0 | |
| March 15, 2019, midnight | 9.3 ppb (9) | 1.6 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | 37.0 ppb (28) | 0.2 ppb (2) | N/A | N/A | 28.0 | |
| March 14, 2019, 11 p.m. | 7.2 ppb (7) | 1.6 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | 40.0 ppb (31) | 0.1 ppb (1) | N/A | N/A | 31.0 | |
| March 14, 2019, 10 p.m. | 6.4 ppb (6) | 1.9 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | 39.0 ppb (30) | 0.1 ppb (1) | N/A | N/A | 30.0 | |
| March 14, 2019, 9 p.m. | 7.1 ppb (7) | 2.4 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | 36.0 ppb (28) | 0.1 ppb (1) | N/A | N/A | 28.0 | |
| March 14, 2019, 8 p.m. | 6.9 ppb (6) | 2.5 ppb (2) | N/A | 4.0 ppb (4) | N/A | N/A | 34.0 ppb (26) | 0.1 ppb (1) | N/A | N/A | 26.0 | |
| March 14, 2019, 6 p.m. | 14.3 ppb (13) | 6.1 ppb (6) | N/A | 8.0 ppb (7) | N/A | N/A | 24.0 ppb (18) | 0.2 ppb (2) | N/A | N/A | 18.0 | |
| March 14, 2019, 5 p.m. | 24.8 ppb (23) | 10.8 ppb (10) | N/A | 14.0 ppb (13) | N/A | N/A | 11.0 ppb (8) | 0.3 ppb (3) | N/A | N/A | 23.0 | |
| March 14, 2019, 4 p.m. | 21.5 ppb (20) | 7.6 ppb (7) | N/A | 14.0 ppb (13) | N/A | N/A | 14.0 ppb (11) | 0.2 ppb (2) | N/A | N/A | 20.0 | |
| March 14, 2019, 3 p.m. | 39.3 ppb (36) | 20.4 ppb (19) | N/A | 19.0 ppb (18) | N/A | N/A | 6.0 ppb (5) | 0.3 ppb (3) | N/A | N/A | 36.0 | |
| March 14, 2019, 2 p.m. | 80.8 ppb (79) | 58.5 ppb (55) | N/A | 22.0 ppb (20) | N/A | N/A | 1.0 ppb (1) | 0.6 ppb (7) | N/A | N/A | 79.0 | |
| March 14, 2019, 1 p.m. | 53.9 ppb (50) | 33.7 ppb (31) | N/A | 20.0 ppb (19) | N/A | N/A | 1.0 ppb (1) | 0.4 ppb (4) | N/A | N/A | 50.0 | |
| March 14, 2019, noon | 41.7 ppb (39) | 22.0 ppb (20) | N/A | 20.0 ppb (19) | N/A | N/A | 1.0 ppb (1) | 0.3 ppb (3) | N/A | N/A | 39.0 | |
| March 14, 2019, 11 a.m. | 27.2 ppb (25) | 8.1 ppb (8) | N/A | 19.0 ppb (18) | N/A | N/A | 2.0 ppb (2) | 0.3 ppb (3) | N/A | N/A | 25.0 | |
| March 14, 2019, 10 a.m. | 25.4 ppb (24) | 7.2 ppb (7) | N/A | 18.0 ppb (17) | N/A | N/A | 2.0 ppb (2) | 0.3 ppb (3) | N/A | N/A | 24.0 | |
| March 14, 2019, 9 a.m. | 29.8 ppb (28) | 12.0 ppb (11) | N/A | 18.0 ppb (17) | N/A | N/A | 2.0 ppb (2) | 0.4 ppb (4) | N/A | N/A | 28.0 | |
| March 14, 2019, 8 a.m. | 23.5 ppb (22) | 6.4 ppb (6) | N/A | 17.0 ppb (16) | N/A | N/A | 2.0 ppb (2) | 0.3 ppb (3) | N/A | N/A | 22.0 | |
| March 14, 2019, 7 a.m. | 16.5 ppb (15) | 1.9 ppb (2) | N/A | 15.0 ppb (14) | N/A | N/A | 6.0 ppb (5) | 0.2 ppb (2) | N/A | N/A | 15.0 | |
| March 14, 2019, 6 a.m. | 20.1 ppb (19) | 2.6 ppb (2) | N/A | 17.0 ppb (16) | N/A | N/A | 8.0 ppb (6) | 0.3 ppb (3) | N/A | N/A | 19.0 | |
| March 14, 2019, 5 a.m. | 16.7 ppb (15) | 1.6 ppb (1) | N/A | 15.0 ppb (14) | N/A | N/A | 18.0 ppb (14) | 0.2 ppb (2) | N/A | N/A | 15.0 | |
| March 14, 2019, 4 a.m. | 15.1 ppb (14) | 1.6 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | 22.0 ppb (17) | 0.2 ppb (2) | N/A | N/A | 17.0 | |
| March 14, 2019, 3 a.m. | 14.1 ppb (13) | 1.5 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | 25.0 ppb (19) | 0.2 ppb (2) | N/A | N/A | 19.0 | |
| March 14, 2019, 2 a.m. | 15.5 ppb (14) | 1.5 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | 23.0 ppb (18) | 0.2 ppb (2) | N/A | N/A | 18.0 |