Williams Lake CC, CA: 52.1342, -122.1528
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 20, 2019, 7 a.m. | N/A | -0.1 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 15.5 μg/m3 (57) | 57.0 | |
| March 20, 2019, 6 a.m. | N/A | -0.3 ppb (0) | N/A | 11.0 ppb (10) | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 23.2 μg/m3 (74) | 74.0 | |
| March 20, 2019, 5 a.m. | N/A | -0.4 ppb (0) | N/A | 15.0 ppb (14) | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 19.5 μg/m3 (66) | 66.0 | |
| March 20, 2019, 4 a.m. | N/A | -0.7 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 16.8 μg/m3 (60) | 60.0 | |
| March 20, 2019, 3 a.m. | N/A | -0.6 ppb (0) | N/A | 14.0 ppb (13) | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 13.4 μg/m3 (53) | 53.0 | |
| March 20, 2019, 2 a.m. | N/A | -0.4 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 8.1 μg/m3 (34) | 34.0 | |
| March 20, 2019, 1 a.m. | N/A | -0.3 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | 53.0 ppb (41) | N/A | N/A | 2.2 μg/m3 (9) | 41.0 | |
| March 20, 2019, midnight | N/A | -0.4 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 56.0 ppb (43) | N/A | N/A | 1.2 μg/m3 (5) | 43.0 | |
| March 19, 2019, 11 p.m. | N/A | 0.1 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | 57.0 ppb (44) | N/A | N/A | 0.8 μg/m3 (3) | 44.0 | |
| March 19, 2019, 10 p.m. | N/A | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | 57.0 ppb (44) | N/A | N/A | 0.8 μg/m3 (3) | 44.0 | |
| March 19, 2019, 9 p.m. | N/A | 0.1 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | 55.0 ppb (42) | N/A | N/A | 1.2 μg/m3 (5) | 42.0 | |
| March 19, 2019, 8 p.m. | N/A | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | 48.0 ppb (37) | N/A | N/A | 3.3 μg/m3 (14) | 37.0 | |
| March 19, 2019, 7 p.m. | N/A | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | 44.0 ppb (34) | N/A | N/A | 5.2 μg/m3 (22) | 34.0 | |
| March 19, 2019, 6 p.m. | N/A | 0.7 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 4.7 μg/m3 (20) | 32.0 | |
| March 19, 2019, 5 p.m. | N/A | 1.5 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 9.5 μg/m3 (40) | 40.0 | |
| March 19, 2019, 4 p.m. | N/A | 2.9 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 10.8 μg/m3 (45) | 45.0 | |
| March 19, 2019, 3 p.m. | N/A | 18.7 ppb (17) | N/A | 23.0 ppb (21) | N/A | N/A | 12.0 ppb (9) | N/A | N/A | 15.7 μg/m3 (58) | 58.0 | |
| March 19, 2019, 2 p.m. | N/A | 17.2 ppb (16) | N/A | 30.0 ppb (28) | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 18.1 μg/m3 (63) | 63.0 | |
| March 19, 2019, 1 p.m. | N/A | 5.5 ppb (5) | N/A | 21.0 ppb (19) | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 15.3 μg/m3 (57) | 57.0 | |
| March 19, 2019, noon | N/A | -0.2 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 14.2 μg/m3 (55) | 55.0 | |
| March 19, 2019, 11 a.m. | N/A | 0.5 ppb (0) | N/A | 13.0 ppb (12) | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 16.3 μg/m3 (59) | 59.0 | |
| March 19, 2019, 10 a.m. | N/A | 0.3 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 15.2 μg/m3 (57) | 57.0 | |
| March 19, 2019, 9 a.m. | N/A | 1.7 ppb (2) | N/A | 11.0 ppb (10) | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 17.3 μg/m3 (61) | 61.0 | |
| March 19, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 16.8 μg/m3 (60) | 60.0 | |
| March 19, 2019, 7 a.m. | N/A | -0.1 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 16.1 μg/m3 (59) | 59.0 | |
| March 19, 2019, 6 a.m. | N/A | -0.3 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 18.5 μg/m3 (64) | 64.0 | |
| March 19, 2019, 5 a.m. | N/A | -0.6 ppb (0) | N/A | 11.0 ppb (10) | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 18.5 μg/m3 (64) | 64.0 | |
| March 19, 2019, 4 a.m. | N/A | 0.0 ppb (0) | N/A | 17.0 ppb (16) | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 44.1 μg/m3 (122) | 122.0 | |
| March 19, 2019, 3 a.m. | N/A | 0.9 ppb (1) | N/A | 23.0 ppb (21) | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 49.0 μg/m3 (134) | 134.0 | |
| March 19, 2019, 2 a.m. | N/A | -0.1 ppb (0) | N/A | 15.0 ppb (14) | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 18.6 μg/m3 (64) | 64.0 | |
| March 19, 2019, 1 a.m. | N/A | 0.0 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 17.1 μg/m3 (61) | 61.0 | |
| March 19, 2019, midnight | N/A | 0.1 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | 49.0 ppb (38) | N/A | N/A | 9.7 μg/m3 (40) | 40.0 | |
| March 18, 2019, 11 p.m. | N/A | 0.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | 48.0 ppb (37) | N/A | N/A | 4.8 μg/m3 (20) | 37.0 | |
| March 18, 2019, 10 p.m. | N/A | 0.5 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | 48.0 ppb (37) | N/A | N/A | 3.5 μg/m3 (15) | 37.0 | |
| March 18, 2019, 9 p.m. | N/A | 1.0 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 46.0 ppb (35) | N/A | N/A | 3.0 μg/m3 (12) | 35.0 | |
| March 18, 2019, 8 p.m. | N/A | 2.1 ppb (2) | N/A | 4.0 ppb (4) | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 4.3 μg/m3 (18) | 32.0 | |
| March 18, 2019, 7 p.m. | N/A | 1.7 ppb (2) | N/A | 4.0 ppb (4) | N/A | N/A | 40.0 ppb (31) | N/A | N/A | 5.1 μg/m3 (21) | 31.0 | |
| March 18, 2019, 6 p.m. | N/A | 3.5 ppb (3) | N/A | 7.0 ppb (6) | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 9.5 μg/m3 (40) | 40.0 | |
| March 18, 2019, 5 p.m. | N/A | 4.4 ppb (4) | N/A | 7.0 ppb (6) | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 8.5 μg/m3 (35) | 35.0 | |
| March 18, 2019, 4 p.m. | N/A | 3.3 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 7.2 μg/m3 (30) | 30.0 | |
| March 18, 2019, 3 p.m. | N/A | 4.9 ppb (5) | N/A | 14.0 ppb (13) | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 8.6 μg/m3 (36) | 36.0 | |
| March 18, 2019, 2 p.m. | N/A | 5.8 ppb (5) | N/A | 20.0 ppb (19) | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 10.5 μg/m3 (44) | 44.0 | |
| March 18, 2019, 1 p.m. | N/A | 4.0 ppb (4) | N/A | 21.0 ppb (19) | N/A | N/A | 8.0 ppb (6) | N/A | N/A | 10.4 μg/m3 (43) | 43.0 | |
| March 18, 2019, noon | N/A | 1.5 ppb (1) | N/A | 15.0 ppb (14) | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 10.9 μg/m3 (45) | 45.0 | |
| March 18, 2019, 11 a.m. | N/A | 0.3 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 10.6 μg/m3 (44) | 44.0 | |
| March 18, 2019, 10 a.m. | N/A | -0.2 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 12.1 μg/m3 (50) | 50.0 | |
| March 18, 2019, 9 a.m. | N/A | 0.1 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 11.5 μg/m3 (48) | 48.0 | |
| March 18, 2019, 8 a.m. | N/A | -0.1 ppb (0) | N/A | 12.0 ppb (11) | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 18, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 12.6 μg/m3 (51) | 51.0 | |
| March 18, 2019, 6 a.m. | N/A | 0.3 ppb (0) | N/A | 11.0 ppb (10) | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 17.0 μg/m3 (61) | 61.0 | |
| March 18, 2019, 5 a.m. | N/A | -0.2 ppb (0) | N/A | 13.0 ppb (12) | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 16.3 μg/m3 (59) | 59.0 | |
| March 18, 2019, 4 a.m. | N/A | 0.3 ppb (0) | N/A | 14.0 ppb (13) | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 18.5 μg/m3 (64) | 64.0 | |
| March 18, 2019, 3 a.m. | N/A | 0.3 ppb (0) | N/A | 18.0 ppb (17) | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 12.8 μg/m3 (52) | 52.0 | |
| March 18, 2019, 2 a.m. | N/A | 0.0 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 5.5 μg/m3 (23) | 23.0 | |
| March 18, 2019, 1 a.m. | N/A | -0.3 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 4.8 μg/m3 (20) | 32.0 | |
| March 18, 2019, midnight | N/A | -0.5 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 49.0 ppb (38) | N/A | N/A | 3.5 μg/m3 (15) | 38.0 | |
| March 17, 2019, 11 p.m. | N/A | -0.2 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | 49.0 ppb (38) | N/A | N/A | 2.1 μg/m3 (9) | 38.0 | |
| March 17, 2019, 10 p.m. | N/A | -0.3 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 48.0 ppb (37) | N/A | N/A | 2.8 μg/m3 (12) | 37.0 | |
| March 17, 2019, 9 p.m. | N/A | 0.8 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 46.0 ppb (35) | N/A | N/A | 3.4 μg/m3 (14) | 35.0 | |
| March 17, 2019, 8 p.m. | N/A | 1.3 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | 43.0 ppb (33) | N/A | N/A | 4.9 μg/m3 (20) | 33.0 | |
| March 17, 2019, 7 p.m. | N/A | 0.8 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 4.1 μg/m3 (17) | 32.0 | |
| March 17, 2019, 6 p.m. | N/A | 1.0 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 5.5 μg/m3 (23) | 28.0 | |
| March 17, 2019, 5 p.m. | N/A | 1.0 ppb (1) | N/A | 1.0 ppb (1) | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 6.1 μg/m3 (25) | 27.0 | |
| March 17, 2019, 4 p.m. | N/A | 2.3 ppb (2) | N/A | 4.0 ppb (4) | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 7.3 μg/m3 (30) | 30.0 | |
| March 17, 2019, 3 p.m. | N/A | 4.3 ppb (4) | N/A | 15.0 ppb (14) | N/A | N/A | 16.0 ppb (12) | N/A | N/A | 13.9 μg/m3 (54) | 54.0 | |
| March 17, 2019, 2 p.m. | N/A | 0.7 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 9.7 μg/m3 (40) | 40.0 | |
| March 17, 2019, 1 p.m. | N/A | 0.9 ppb (1) | N/A | 17.0 ppb (16) | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 12.2 μg/m3 (50) | 50.0 | |
| March 17, 2019, noon | N/A | 0.9 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 11.9 μg/m3 (50) | 50.0 | |
| March 17, 2019, 11 a.m. | N/A | 0.0 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 11.6 μg/m3 (48) | 48.0 | |
| March 17, 2019, 10 a.m. | N/A | 0.4 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 13.8 μg/m3 (54) | 54.0 | |
| March 17, 2019, 9 a.m. | N/A | 1.0 ppb (1) | N/A | 11.0 ppb (10) | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 13.4 μg/m3 (53) | 53.0 | |
| March 17, 2019, 8 a.m. | N/A | -0.1 ppb (0) | N/A | 13.0 ppb (12) | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 14.3 μg/m3 (55) | 55.0 | |
| March 17, 2019, 7 a.m. | N/A | 0.4 ppb (0) | N/A | 13.0 ppb (12) | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 18.8 μg/m3 (64) | 64.0 | |
| March 17, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 13.7 μg/m3 (54) | 54.0 | |
| March 17, 2019, 5 a.m. | N/A | 0.1 ppb (0) | N/A | 11.0 ppb (10) | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| March 17, 2019, 4 a.m. | N/A | -0.1 ppb (0) | N/A | 14.0 ppb (13) | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 15.4 μg/m3 (57) | 57.0 | |
| March 17, 2019, 3 a.m. | N/A | 0.1 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 19.8 μg/m3 (67) | 67.0 | |
| March 17, 2019, 2 a.m. | N/A | -0.3 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 13.7 μg/m3 (54) | 54.0 | |
| March 17, 2019, 1 a.m. | N/A | 0.4 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 14.6 μg/m3 (56) | 56.0 | |
| March 17, 2019, midnight | N/A | 0.0 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | 48.0 ppb (37) | N/A | N/A | 3.4 μg/m3 (14) | 37.0 | |
| March 16, 2019, 11 p.m. | N/A | 0.1 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | 49.0 ppb (38) | N/A | N/A | 2.4 μg/m3 (10) | 38.0 | |
| March 16, 2019, 10 p.m. | N/A | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 49.0 ppb (38) | N/A | N/A | 1.9 μg/m3 (8) | 38.0 | |
| March 16, 2019, 9 p.m. | N/A | 0.2 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 48.0 ppb (37) | N/A | N/A | 1.5 μg/m3 (6) | 37.0 | |
| March 16, 2019, 8 p.m. | N/A | 0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 47.0 ppb (36) | N/A | N/A | 2.1 μg/m3 (9) | 36.0 | |
| March 16, 2019, 7 p.m. | N/A | 1.6 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | 41.0 ppb (32) | N/A | N/A | 6.0 μg/m3 (25) | 32.0 | |
| March 16, 2019, 6 p.m. | N/A | 1.6 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 8.1 μg/m3 (34) | 34.0 | |
| March 16, 2019, 5 p.m. | N/A | 1.9 ppb (2) | N/A | 3.0 ppb (3) | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 11.2 μg/m3 (47) | 47.0 | |
| March 16, 2019, 4 p.m. | N/A | 1.6 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 15.6 μg/m3 (58) | 58.0 | |
| March 16, 2019, 3 p.m. | N/A | 4.7 ppb (4) | N/A | 18.0 ppb (17) | N/A | N/A | 14.0 ppb (11) | N/A | N/A | 14.2 μg/m3 (55) | 55.0 | |
| March 16, 2019, 2 p.m. | N/A | 1.0 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | 16.0 ppb (12) | N/A | N/A | 10.1 μg/m3 (42) | 42.0 | |
| March 16, 2019, 1 p.m. | N/A | 0.4 ppb (0) | N/A | 15.0 ppb (14) | N/A | N/A | 15.0 ppb (12) | N/A | N/A | 10.1 μg/m3 (42) | 42.0 | |
| March 16, 2019, noon | N/A | 0.2 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 11.7 μg/m3 (49) | 49.0 | |
| March 16, 2019, 11 a.m. | N/A | -0.2 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 10.1 μg/m3 (42) | 42.0 | |
| March 16, 2019, 10 a.m. | N/A | 0.0 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 11.2 μg/m3 (47) | 47.0 | |
| March 16, 2019, 9 a.m. | N/A | -0.1 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 7.9 μg/m3 (33) | 33.0 | |
| March 16, 2019, 8 a.m. | N/A | 0.2 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 9.1 μg/m3 (38) | 38.0 | |
| March 16, 2019, 7 a.m. | N/A | -0.2 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 8.6 μg/m3 (36) | 36.0 | |
| March 16, 2019, 6 a.m. | N/A | -0.2 ppb (0) | N/A | 18.0 ppb (17) | N/A | N/A | 16.0 ppb (12) | N/A | N/A | 18.8 μg/m3 (64) | 64.0 | |
| March 16, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 23.8 μg/m3 (75) | 75.0 | |
| March 16, 2019, 4 a.m. | N/A | 0.6 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 11.7 μg/m3 (49) | 49.0 | |
| March 16, 2019, 3 a.m. | N/A | 0.3 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 6.8 μg/m3 (28) | 28.0 | |
| March 16, 2019, 2 a.m. | N/A | -0.4 ppb (0) | N/A | 11.0 ppb (10) | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 7.9 μg/m3 (33) | 33.0 | |
| March 16, 2019, 1 a.m. | N/A | 0.2 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 6.4 μg/m3 (27) | 32.0 | |
| March 16, 2019, midnight | N/A | -0.1 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 48.0 ppb (37) | N/A | N/A | 2.0 μg/m3 (8) | 37.0 | |
| March 15, 2019, 11 p.m. | N/A | 0.7 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | 46.0 ppb (35) | N/A | N/A | 2.9 μg/m3 (12) | 35.0 | |
| March 15, 2019, 10 p.m. | N/A | 0.4 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | 45.0 ppb (35) | N/A | N/A | 2.7 μg/m3 (11) | 35.0 | |
| March 15, 2019, 9 p.m. | N/A | 0.7 ppb (1) | N/A | 3.0 ppb (3) | N/A | N/A | 47.0 ppb (36) | N/A | N/A | 3.0 μg/m3 (12) | 36.0 | |
| March 15, 2019, 8 p.m. | N/A | 0.8 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 47.0 ppb (36) | N/A | N/A | 2.2 μg/m3 (9) | 36.0 | |
| March 15, 2019, 7 p.m. | N/A | 1.1 ppb (1) | N/A | 2.0 ppb (2) | N/A | N/A | 44.0 ppb (34) | N/A | N/A | 4.6 μg/m3 (19) | 34.0 | |
| March 15, 2019, 6 p.m. | N/A | 4.5 ppb (4) | N/A | 8.0 ppb (7) | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 10.9 μg/m3 (45) | 45.0 | |
| March 15, 2019, 5 p.m. | N/A | 9.0 ppb (8) | N/A | 14.0 ppb (13) | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 31.6 μg/m3 (92) | 92.0 | |
| March 15, 2019, 4 p.m. | N/A | 15.1 ppb (14) | N/A | 21.0 ppb (19) | N/A | N/A | 15.0 ppb (12) | N/A | N/A | 46.1 μg/m3 (126) | 126.0 | |
| March 15, 2019, 3 p.m. | N/A | 21.0 ppb (19) | N/A | 26.0 ppb (24) | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 23.3 μg/m3 (74) | 74.0 | |
| March 15, 2019, 2 p.m. | N/A | 13.4 ppb (12) | N/A | 25.0 ppb (23) | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 18.0 μg/m3 (63) | 63.0 | |
| March 15, 2019, 1 p.m. | N/A | 13.0 ppb (12) | N/A | 28.0 ppb (26) | N/A | N/A | 1.0 ppb (1) | N/A | N/A | 15.9 μg/m3 (58) | 58.0 | |
| March 15, 2019, noon | N/A | 4.7 ppb (4) | N/A | 21.0 ppb (19) | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 13.3 μg/m3 (53) | 53.0 | |
| March 15, 2019, 11 a.m. | N/A | -0.2 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 9.9 μg/m3 (41) | 41.0 | |
| March 15, 2019, 10 a.m. | N/A | 1.4 ppb (1) | N/A | 18.0 ppb (17) | N/A | N/A | 12.0 ppb (9) | N/A | N/A | 15.9 μg/m3 (58) | 58.0 | |
| March 15, 2019, 9 a.m. | N/A | -0.1 ppb (0) | N/A | 16.0 ppb (15) | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 17.8 μg/m3 (62) | 62.0 | |
| March 15, 2019, 8 a.m. | N/A | 0.6 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 13.3 μg/m3 (53) | 53.0 | |
| March 15, 2019, 7 a.m. | N/A | -0.2 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 18.4 μg/m3 (64) | 64.0 | |
| March 15, 2019, 6 a.m. | N/A | 0.1 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 17.5 μg/m3 (62) | 62.0 | |
| March 15, 2019, 5 a.m. | N/A | 0.3 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 6.4 μg/m3 (27) | 27.0 | |
| March 15, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 8.3 μg/m3 (35) | 35.0 | |
| March 15, 2019, 3 a.m. | N/A | 0.4 ppb (0) | N/A | 15.0 ppb (14) | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 12.1 μg/m3 (50) | 50.0 | |
| March 15, 2019, 2 a.m. | N/A | -0.1 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 4.8 μg/m3 (20) | 28.0 | |
| March 15, 2019, 1 a.m. | N/A | 0.0 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | 43.0 ppb (33) | N/A | N/A | 2.1 μg/m3 (9) | 33.0 | |
| March 15, 2019, midnight | N/A | -0.7 ppb (0) | N/A | 1.0 ppb (1) | N/A | N/A | 45.0 ppb (35) | N/A | N/A | 1.4 μg/m3 (6) | 35.0 | |
| March 14, 2019, 11 p.m. | N/A | 0.2 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | 43.0 ppb (33) | N/A | N/A | 2.4 μg/m3 (10) | 33.0 | |
| March 14, 2019, 10 p.m. | N/A | 0.5 ppb (0) | N/A | 2.0 ppb (2) | N/A | N/A | 45.0 ppb (35) | N/A | N/A | 1.8 μg/m3 (8) | 35.0 | |
| March 14, 2019, 9 p.m. | N/A | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | 46.0 ppb (35) | N/A | N/A | 1.4 μg/m3 (6) | 35.0 | |
| March 14, 2019, 8 p.m. | N/A | 0.4 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | 44.0 ppb (34) | N/A | N/A | 1.5 μg/m3 (6) | 34.0 | |
| March 14, 2019, 7 p.m. | N/A | 0.0 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | 43.0 ppb (33) | N/A | N/A | 1.6 μg/m3 (7) | 33.0 | |
| March 14, 2019, 6 p.m. | N/A | 0.5 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | 42.0 ppb (32) | N/A | N/A | 1.7 μg/m3 (7) | 32.0 | |
| March 14, 2019, 5 p.m. | N/A | 0.2 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | 41.0 ppb (32) | N/A | N/A | 1.6 μg/m3 (7) | 32.0 | |
| March 14, 2019, 4 p.m. | N/A | 0.4 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | 41.0 ppb (32) | N/A | N/A | 1.4 μg/m3 (6) | 32.0 | |
| March 14, 2019, 3 p.m. | N/A | 0.5 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 5.6 μg/m3 (23) | 25.0 | |
| March 14, 2019, 2 p.m. | N/A | 0.9 ppb (1) | N/A | 17.0 ppb (16) | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 12.8 μg/m3 (52) | 52.0 | |
| March 14, 2019, 1 p.m. | N/A | 0.0 ppb (0) | N/A | 13.0 ppb (12) | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 14, 2019, noon | N/A | 0.1 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 5.6 μg/m3 (23) | 24.0 | |
| March 14, 2019, 11 a.m. | N/A | -0.4 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 5.1 μg/m3 (21) | 23.0 | |
| March 14, 2019, 10 a.m. | N/A | 0.1 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 6.2 μg/m3 (26) | 26.0 | |
| March 14, 2019, 9 a.m. | N/A | -0.7 ppb (0) | N/A | 10.0 ppb (9) | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 7.3 μg/m3 (30) | 30.0 | |
| March 14, 2019, 8 a.m. | N/A | -0.4 ppb (0) | N/A | 7.0 ppb (6) | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 7.1 μg/m3 (30) | 30.0 | |
| March 14, 2019, 7 a.m. | N/A | -0.3 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 9.2 μg/m3 (38) | 38.0 | |
| March 14, 2019, 6 a.m. | N/A | 0.0 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 11.6 μg/m3 (48) | 48.0 | |
| March 14, 2019, 5 a.m. | N/A | -0.2 ppb (0) | N/A | 12.0 ppb (11) | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 13.3 μg/m3 (53) | 53.0 | |
| March 14, 2019, 4 a.m. | N/A | 0.5 ppb (0) | N/A | 18.0 ppb (17) | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 12.3 μg/m3 (51) | 51.0 | |
| March 14, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 11.7 μg/m3 (49) | 49.0 | |
| March 14, 2019, 2 a.m. | N/A | 2.9 ppb (3) | N/A | 22.0 ppb (20) | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 28.8 μg/m3 (86) | 86.0 | |
| March 14, 2019, 1 a.m. | N/A | 0.4 ppb (0) | N/A | 9.0 ppb (8) | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 7.8 μg/m3 (32) | 32.0 | |
| March 14, 2019, midnight | N/A | 0.4 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 4.2 μg/m3 (18) | 30.0 | |
| March 13, 2019, 11 p.m. | N/A | -0.4 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | 45.0 ppb (35) | N/A | N/A | 1.5 μg/m3 (6) | 35.0 | |
| March 13, 2019, 10 p.m. | N/A | 0.1 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | 44.0 ppb (34) | N/A | N/A | 1.4 μg/m3 (6) | 34.0 | |
| March 13, 2019, 9 p.m. | N/A | 0.1 ppb (0) | N/A | -1.0 ppb (0) | N/A | N/A | 44.0 ppb (34) | N/A | N/A | 1.1 μg/m3 (5) | 34.0 | |
| March 13, 2019, 8 p.m. | N/A | 0.2 ppb (0) | N/A | 0.0 ppb (0) | N/A | N/A | 43.0 ppb (33) | N/A | N/A | 1.6 μg/m3 (7) | 33.0 | |
| March 13, 2019, 7 p.m. | N/A | 2.8 ppb (3) | N/A | 5.0 ppb (5) | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 6.4 μg/m3 (27) | 28.0 | |
| March 13, 2019, 6 p.m. | N/A | 4.4 ppb (4) | N/A | 7.0 ppb (6) | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| March 13, 2019, 5 p.m. | N/A | 9.8 ppb (9) | N/A | 13.0 ppb (12) | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| March 13, 2019, 4 p.m. | N/A | 14.0 ppb (13) | N/A | 17.0 ppb (16) | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 13.9 μg/m3 (54) | 54.0 | |
| March 13, 2019, 3 p.m. | N/A | 20.9 ppb (19) | N/A | 28.0 ppb (26) | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 15.3 μg/m3 (57) | 57.0 | |
| March 13, 2019, 2 p.m. | N/A | 23.7 ppb (22) | N/A | 32.0 ppb (30) | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 14.2 μg/m3 (55) | 55.0 | |
| March 13, 2019, 1 p.m. | N/A | 18.5 ppb (17) | N/A | 33.0 ppb (31) | N/A | N/A | 1.0 ppb (1) | N/A | N/A | 12.5 μg/m3 (51) | 51.0 | |
| March 13, 2019, noon | N/A | 13.0 ppb (12) | N/A | 33.0 ppb (31) | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 13.4 μg/m3 (53) | 53.0 | |
| March 13, 2019, 11 a.m. | N/A | 13.6 ppb (13) | N/A | 35.0 ppb (32) | N/A | N/A | 1.0 ppb (1) | N/A | N/A | 14.8 μg/m3 (56) | 56.0 | |
| March 13, 2019, 10 a.m. | N/A | 12.6 ppb (12) | N/A | 32.0 ppb (30) | N/A | N/A | 1.0 ppb (1) | N/A | N/A | 17.7 μg/m3 (62) | 62.0 | |
| March 13, 2019, 9 a.m. | N/A | 11.4 ppb (11) | N/A | 35.0 ppb (32) | N/A | N/A | 1.0 ppb (1) | N/A | N/A | 15.3 μg/m3 (57) | 57.0 | |
| March 13, 2019, 8 a.m. | N/A | 2.1 ppb (2) | N/A | 19.0 ppb (18) | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 20.3 μg/m3 (68) | 68.0 |