Seattle WA, US: 47.597222, -122.319722
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| May 25, 2019, 5 p.m. | 21.8 ppb (20) | 12.0 ppb (11) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.36 ppb (4) | N/A | 2.0 μg/m3 (8) | 20.0 | |
| May 25, 2019, 4 p.m. | 23.5 ppb (22) | 11.4 ppb (11) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 2.0 μg/m3 (8) | 22.0 | |
| May 25, 2019, 3 p.m. | 30.7 ppb (28) | 15.5 ppb (14) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.42 ppb (5) | N/A | 1.0 μg/m3 (4) | 28.0 | |
| May 25, 2019, 2 p.m. | 25.9 ppb (24) | 12.2 ppb (11) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 4.0 μg/m3 (17) | 24.0 | |
| May 25, 2019, 1 p.m. | 23.5 ppb (22) | 9.2 ppb (9) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 5.0 μg/m3 (21) | 22.0 | |
| May 25, 2019, noon | 15.7 ppb (15) | 5.5 ppb (5) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 25, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 25, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 25, 2019, 9 a.m. | 13.3 ppb (12) | 4.2 ppb (4) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 2.0 μg/m3 (8) | 12.0 | |
| May 25, 2019, 8 a.m. | 11.7 ppb (11) | 3.2 ppb (3) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 25, 2019, 7 a.m. | 16.4 ppb (15) | 5.6 ppb (5) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 25, 2019, 6 a.m. | 19.2 ppb (18) | 8.0 ppb (7) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 25, 2019, 5 a.m. | 24.9 ppb (23) | 10.2 ppb (9) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 25, 2019, 4 a.m. | 24.5 ppb (23) | 10.3 ppb (10) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 4.0 μg/m3 (17) | 23.0 | |
| May 25, 2019, 3 a.m. | 28.1 ppb (26) | 13.2 ppb (12) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 6.0 μg/m3 (25) | 26.0 | |
| May 25, 2019, 2 a.m. | 32.8 ppb (30) | 16.6 ppb (15) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | 7.0 μg/m3 (29) | 30.0 | |
| May 25, 2019, 1 a.m. | 33.8 ppb (31) | 18.5 ppb (17) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 6.0 μg/m3 (25) | 31.0 | |
| May 25, 2019, midnight | 31.6 ppb (29) | 16.6 ppb (15) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 5.0 μg/m3 (21) | 29.0 | |
| May 24, 2019, 11 p.m. | 30.9 ppb (29) | 16.9 ppb (16) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 24, 2019, 10 p.m. | 41.9 ppb (39) | 28.4 ppb (26) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.42 ppb (5) | N/A | 3.0 μg/m3 (12) | 39.0 | |
| May 24, 2019, 9 p.m. | 44.4 ppb (41) | 24.7 ppb (23) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | 3.0 μg/m3 (12) | 41.0 | |
| May 24, 2019, 8 p.m. | 46.8 ppb (43) | 28.7 ppb (27) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.42 ppb (5) | N/A | 3.0 μg/m3 (12) | 43.0 | |
| May 24, 2019, 7 p.m. | 45.4 ppb (42) | 23.8 ppb (22) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 6.0 μg/m3 (25) | 42.0 | |
| May 24, 2019, 6 p.m. | 45.5 ppb (42) | 23.5 ppb (22) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 7.0 μg/m3 (29) | 42.0 | |
| May 24, 2019, 5 p.m. | 44.6 ppb (41) | 27.4 ppb (25) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 9.0 μg/m3 (38) | 41.0 | |
| May 24, 2019, 4 p.m. | 46.5 ppb (43) | 24.2 ppb (22) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 8.0 μg/m3 (33) | 43.0 | |
| May 24, 2019, 3 p.m. | 47.5 ppb (44) | 23.6 ppb (22) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 9.0 μg/m3 (38) | 44.0 | |
| May 24, 2019, 2 p.m. | 36.5 ppb (34) | 15.1 ppb (14) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 8.0 μg/m3 (33) | 34.0 | |
| May 24, 2019, 1 p.m. | 38.5 ppb (36) | 20.1 ppb (19) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 24, 2019, noon | 31.9 ppb (30) | 15.0 ppb (14) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 7.0 μg/m3 (29) | 30.0 | |
| May 24, 2019, 11 a.m. | 17.5 ppb (16) | 7.1 ppb (7) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 24, 2019, 10 a.m. | 10.5 ppb (10) | 3.6 ppb (3) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 24, 2019, 9 a.m. | 10.6 ppb (10) | 3.7 ppb (3) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 24, 2019, 8 a.m. | 8.9 ppb (8) | 3.4 ppb (3) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 24, 2019, 7 a.m. | 12.0 ppb (11) | 5.3 ppb (5) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 24, 2019, 6 a.m. | 23.9 ppb (22) | 9.6 ppb (9) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 24, 2019, 5 a.m. | 59.1 ppb (55) | 26.0 ppb (24) | N/A | 33.0 ppb (31) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | 11.0 μg/m3 (46) | 55.0 | |
| May 24, 2019, 4 a.m. | 84.3 ppb (82) | 38.7 ppb (36) | N/A | 46.0 ppb (43) | N/A | N/A | N/A | 0.54 ppb (6) | N/A | 10.0 μg/m3 (42) | 82.0 | |
| May 24, 2019, 3 a.m. | 138.6 ppb (107) | 84.5 ppb (82) | N/A | 54.0 ppb (50) | N/A | N/A | N/A | 0.83 ppb (9) | N/A | 19.0 μg/m3 (65) | 107.0 | |
| May 24, 2019, 2 a.m. | 113.2 ppb (102) | 64.1 ppb (61) | N/A | 49.0 ppb (45) | N/A | N/A | N/A | 0.71 ppb (8) | N/A | 15.0 μg/m3 (56) | 102.0 | |
| May 24, 2019, 1 a.m. | 99.2 ppb (98) | 56.8 ppb (53) | N/A | 42.0 ppb (39) | N/A | N/A | N/A | 0.67 ppb (7) | N/A | 14.0 μg/m3 (54) | 98.0 | |
| May 24, 2019, midnight | 47.6 ppb (44) | 20.5 ppb (19) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.47 ppb (5) | N/A | 7.0 μg/m3 (29) | 44.0 | |
| May 23, 2019, 11 p.m. | 71.2 ppb (68) | 39.7 ppb (37) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 11.0 μg/m3 (46) | 68.0 | |
| May 23, 2019, 10 p.m. | 42.0 ppb (39) | 21.3 ppb (20) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 6.0 μg/m3 (25) | 39.0 | |
| May 23, 2019, 9 p.m. | 45.8 ppb (42) | 25.3 ppb (23) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 8.0 μg/m3 (33) | 42.0 | |
| May 23, 2019, 8 p.m. | 69.3 ppb (66) | 41.5 ppb (38) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.54 ppb (6) | N/A | 16.0 μg/m3 (59) | 66.0 | |
| May 23, 2019, 7 p.m. | 57.0 ppb (53) | 33.3 ppb (31) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | 16.0 μg/m3 (59) | 59.0 | |
| May 23, 2019, 6 p.m. | 67.8 ppb (65) | 46.3 ppb (43) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 14.0 μg/m3 (54) | 65.0 | |
| May 23, 2019, 5 p.m. | 73.3 ppb (71) | 52.1 ppb (48) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.47 ppb (5) | N/A | 15.0 μg/m3 (56) | 71.0 | |
| May 23, 2019, 4 p.m. | 87.4 ppb (86) | 58.0 ppb (54) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 16.0 μg/m3 (59) | 86.0 | |
| May 23, 2019, 3 p.m. | 79.3 ppb (77) | 51.4 ppb (48) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 15.0 μg/m3 (56) | 77.0 | |
| May 23, 2019, 2 p.m. | 82.4 ppb (80) | 56.3 ppb (52) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.51 ppb (6) | N/A | 15.0 μg/m3 (56) | 80.0 | |
| May 23, 2019, 1 p.m. | 117.2 ppb (103) | 84.4 ppb (82) | N/A | 33.0 ppb (31) | N/A | N/A | N/A | 0.67 ppb (7) | N/A | 18.0 μg/m3 (63) | 103.0 | |
| May 23, 2019, noon | 89.5 ppb (88) | 65.1 ppb (62) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.8 ppb (9) | N/A | 15.0 μg/m3 (56) | 88.0 | |
| May 23, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 23, 2019, 10 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 | |
| May 23, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 23, 2019, 8 a.m. | 54.9 ppb (51) | 16.7 ppb (15) | N/A | 38.0 ppb (35) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | 10.0 μg/m3 (42) | 51.0 | |
| May 23, 2019, 7 a.m. | 55.3 ppb (51) | 17.4 ppb (16) | N/A | 38.0 ppb (35) | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 23, 2019, 6 a.m. | 36.1 ppb (33) | 10.9 ppb (10) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.33 ppb (4) | N/A | 18.0 μg/m3 (63) | 63.0 | |
| May 23, 2019, 5 a.m. | 26.4 ppb (24) | 5.0 ppb (5) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 23, 2019, 4 a.m. | 10.5 ppb (10) | 1.0 ppb (1) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 23, 2019, 3 a.m. | 10.4 ppb (10) | 1.6 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 23, 2019, 2 a.m. | 12.2 ppb (11) | 3.4 ppb (3) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 23, 2019, 1 a.m. | 26.0 ppb (24) | 10.4 ppb (10) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.46 ppb (5) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 23, 2019, midnight | 44.1 ppb (41) | 19.6 ppb (18) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 22, 2019, 11 p.m. | 59.0 ppb (55) | 29.6 ppb (27) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.44 ppb (5) | N/A | 8.0 μg/m3 (33) | 55.0 | |
| May 22, 2019, 10 p.m. | 53.7 ppb (50) | 29.4 ppb (27) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | N/A | 50.0 | |
| May 22, 2019, 9 p.m. | 52.1 ppb (48) | 28.5 ppb (26) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.53 ppb (6) | N/A | 7.0 μg/m3 (29) | 48.0 | |
| May 22, 2019, 8 p.m. | 53.6 ppb (50) | 30.5 ppb (28) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.56 ppb (6) | N/A | 7.0 μg/m3 (29) | 50.0 | |
| May 22, 2019, 7 p.m. | 61.3 ppb (58) | 39.2 ppb (36) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 10.0 μg/m3 (42) | 58.0 | |
| May 22, 2019, 6 p.m. | 96.5 ppb (95) | 67.3 ppb (64) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.58 ppb (6) | N/A | 16.0 μg/m3 (59) | 95.0 | |
| May 22, 2019, 5 p.m. | 83.3 ppb (81) | 55.5 ppb (52) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.46 ppb (5) | N/A | 14.0 μg/m3 (54) | 81.0 | |
| May 22, 2019, 4 p.m. | 131.4 ppb (106) | 97.6 ppb (96) | N/A | 34.0 ppb (31) | N/A | N/A | N/A | 0.63 ppb (7) | N/A | 20.0 μg/m3 (67) | 106.0 | |
| May 22, 2019, 3 p.m. | 159.5 ppb (111) | 129.8 ppb (106) | N/A | 30.0 ppb (28) | N/A | N/A | N/A | 0.7 ppb (8) | N/A | 21.0 μg/m3 (69) | 111.0 | |
| May 22, 2019, 2 p.m. | 65.3 ppb (62) | 46.1 ppb (43) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.58 ppb (6) | N/A | 7.0 μg/m3 (29) | 62.0 | |
| May 22, 2019, 1 p.m. | 139.5 ppb (107) | 107.0 ppb (101) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.96 ppb (11) | N/A | 18.0 μg/m3 (63) | 107.0 | |
| May 22, 2019, noon | 79.3 ppb (77) | 59.2 ppb (56) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.75 ppb (8) | N/A | 12.0 μg/m3 (50) | 77.0 | |
| May 22, 2019, 11 a.m. | 19.8 ppb (18) | 4.7 ppb (4) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 22, 2019, 10 a.m. | 21.2 ppb (20) | 4.9 ppb (5) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 22, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 22, 2019, 8 a.m. | 38.2 ppb (35) | 12.5 ppb (12) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 22, 2019, 7 a.m. | 62.4 ppb (59) | 28.4 ppb (26) | N/A | 34.0 ppb (31) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 12.0 μg/m3 (50) | 59.0 | |
| May 22, 2019, 6 a.m. | 23.7 ppb (22) | 3.2 ppb (3) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 22, 2019, 5 a.m. | 30.9 ppb (29) | 5.9 ppb (5) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 6.0 μg/m3 (25) | 29.0 | |
| May 22, 2019, 4 a.m. | 91.1 ppb (89) | 46.9 ppb (43) | N/A | N/A | N/A | N/A | N/A | 0.66 ppb (7) | N/A | 17.0 μg/m3 (61) | 89.0 | |
| May 22, 2019, 3 a.m. | 15.5 ppb (14) | 4.0 ppb (4) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 22, 2019, 2 a.m. | 9.6 ppb (9) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 22, 2019, 1 a.m. | 9.6 ppb (9) | 2.3 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 22, 2019, midnight | 8.1 ppb (8) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 21, 2019, 11 p.m. | 9.2 ppb (9) | 2.6 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 21, 2019, 10 p.m. | 9.8 ppb (9) | 3.5 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 21, 2019, 9 p.m. | 16.5 ppb (15) | 6.6 ppb (6) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 21, 2019, 8 p.m. | 40.4 ppb (37) | 22.5 ppb (21) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.49 ppb (5) | N/A | 8.0 μg/m3 (33) | 37.0 | |
| May 21, 2019, 7 p.m. | 28.4 ppb (26) | 13.7 ppb (13) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 21, 2019, 6 p.m. | 18.7 ppb (17) | 8.1 ppb (8) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 21, 2019, 5 p.m. | 13.6 ppb (13) | 4.8 ppb (4) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 1.0 μg/m3 (4) | 13.0 | |
| May 21, 2019, 4 p.m. | 25.1 ppb (23) | 12.3 ppb (11) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 0.0 μg/m3 (0) | 23.0 | |
| May 21, 2019, 3 p.m. | 12.9 ppb (12) | 3.0 ppb (3) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | -1.0 μg/m3 (0) | 12.0 | |
| May 21, 2019, 2 p.m. | 11.1 ppb (10) | 2.1 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 0.0 μg/m3 (0) | 10.0 | |
| May 21, 2019, 1 p.m. | 15.6 ppb (14) | 5.9 ppb (5) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 0.0 μg/m3 (0) | 14.0 | |
| May 21, 2019, noon | 11.2 ppb (10) | 4.0 ppb (4) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 21, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 21, 2019, 10 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 | |
| May 21, 2019, 9 a.m. | 2.9 ppb (3) | 0.1 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 1.0 μg/m3 (4) | 4.0 | |
| May 21, 2019, 8 a.m. | 2.9 ppb (3) | 0.4 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 21, 2019, 7 a.m. | 4.3 ppb (4) | 0.6 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 21, 2019, 6 a.m. | 3.7 ppb (3) | 0.4 ppb (0) | N/A | 3.0 ppb (3) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 21, 2019, 5 a.m. | 4.8 ppb (4) | 0.5 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 21, 2019, 4 a.m. | 5.2 ppb (5) | 0.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 21, 2019, 3 a.m. | 5.8 ppb (5) | 0.6 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 21, 2019, 2 a.m. | 9.3 ppb (9) | 1.6 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 2.0 μg/m3 (8) | 9.0 | |
| May 21, 2019, 1 a.m. | 13.2 ppb (12) | 2.1 ppb (2) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 21, 2019, midnight | 23.5 ppb (22) | 7.8 ppb (7) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 20, 2019, 11 p.m. | 46.2 ppb (43) | 20.6 ppb (19) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 5.0 μg/m3 (21) | 43.0 | |
| May 20, 2019, 10 p.m. | 46.4 ppb (43) | 22.7 ppb (21) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 5.0 μg/m3 (21) | 43.0 | |
| May 20, 2019, 9 p.m. | 40.5 ppb (38) | 24.1 ppb (22) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.42 ppb (5) | N/A | 4.0 μg/m3 (17) | 38.0 | |
| May 20, 2019, 8 p.m. | 47.8 ppb (44) | 25.6 ppb (24) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.46 ppb (5) | N/A | 2.0 μg/m3 (8) | 44.0 | |
| May 20, 2019, 7 p.m. | 45.5 ppb (42) | 26.5 ppb (25) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | 4.0 μg/m3 (17) | 42.0 | |
| May 20, 2019, 6 p.m. | 49.0 ppb (45) | 26.6 ppb (25) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.38 ppb (4) | N/A | 6.0 μg/m3 (25) | 45.0 | |
| May 20, 2019, 5 p.m. | 46.9 ppb (43) | 23.5 ppb (22) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 5.0 μg/m3 (21) | 43.0 | |
| May 20, 2019, 4 p.m. | 45.0 ppb (42) | 19.9 ppb (18) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.36 ppb (4) | N/A | 5.0 μg/m3 (21) | 42.0 | |
| May 20, 2019, 3 p.m. | 49.5 ppb (46) | 22.6 ppb (21) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 7.0 μg/m3 (29) | 46.0 | |
| May 20, 2019, 2 p.m. | 48.8 ppb (45) | 20.5 ppb (19) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 4.0 μg/m3 (17) | 45.0 | |
| May 20, 2019, 1 p.m. | 52.3 ppb (48) | 25.9 ppb (24) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.46 ppb (5) | N/A | 0.0 μg/m3 (0) | 48.0 | |
| May 20, 2019, noon | 43.1 ppb (40) | 21.9 ppb (20) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.43 ppb (5) | N/A | 3.0 μg/m3 (12) | 40.0 | |
| May 20, 2019, 11 a.m. | 19.4 ppb (18) | 8.0 ppb (7) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 3.0 μg/m3 (12) | 18.0 | |
| May 20, 2019, 10 a.m. | 15.9 ppb (15) | 4.5 ppb (4) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 1.0 μg/m3 (4) | 15.0 | |
| May 20, 2019, 9 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 | |
| May 20, 2019, 8 a.m. | 17.4 ppb (16) | 4.1 ppb (4) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 20, 2019, 7 a.m. | 12.6 ppb (12) | 4.0 ppb (4) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 20, 2019, 6 a.m. | 30.6 ppb (28) | 6.9 ppb (6) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 6.0 μg/m3 (25) | 28.0 | |
| May 20, 2019, 5 a.m. | 57.9 ppb (54) | 21.1 ppb (20) | N/A | 37.0 ppb (34) | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 8.0 μg/m3 (33) | 54.0 | |
| May 20, 2019, 4 a.m. | 33.2 ppb (31) | 9.4 ppb (9) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 20, 2019, 3 a.m. | 34.9 ppb (32) | 13.1 ppb (12) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.57 ppb (6) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 20, 2019, 2 a.m. | 35.6 ppb (33) | 13.0 ppb (12) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.57 ppb (6) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 20, 2019, 1 a.m. | 49.4 ppb (46) | 21.5 ppb (20) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.58 ppb (6) | N/A | 8.0 μg/m3 (33) | 46.0 | |
| May 20, 2019, midnight | 30.6 ppb (28) | 13.0 ppb (12) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 19, 2019, 11 p.m. | 34.3 ppb (32) | 16.3 ppb (15) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 6.0 μg/m3 (25) | 32.0 | |
| May 19, 2019, 10 p.m. | 34.3 ppb (32) | 18.0 ppb (17) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 4.0 μg/m3 (17) | 32.0 | |
| May 19, 2019, 9 p.m. | 32.3 ppb (30) | 17.7 ppb (16) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 4.0 μg/m3 (17) | 30.0 | |
| May 19, 2019, 8 p.m. | 38.8 ppb (36) | 20.6 ppb (19) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.38 ppb (4) | N/A | 7.0 μg/m3 (29) | 36.0 | |
| May 19, 2019, 7 p.m. | 36.5 ppb (34) | 20.1 ppb (19) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 6.0 μg/m3 (25) | 34.0 | |
| May 19, 2019, 6 p.m. | 56.2 ppb (52) | 32.7 ppb (30) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.42 ppb (5) | N/A | 6.0 μg/m3 (25) | 52.0 | |
| May 19, 2019, 5 p.m. | 58.1 ppb (54) | 34.8 ppb (32) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.46 ppb (5) | N/A | 8.0 μg/m3 (33) | 54.0 | |
| May 19, 2019, 4 p.m. | 37.1 ppb (34) | 21.4 ppb (20) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.41 ppb (5) | N/A | 1.0 μg/m3 (4) | 34.0 | |
| May 19, 2019, 3 p.m. | 15.9 ppb (15) | 5.9 ppb (5) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | -1.0 μg/m3 (0) | 15.0 | |
| May 19, 2019, 2 p.m. | 8.7 ppb (8) | 1.0 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| May 19, 2019, 1 p.m. | 17.1 ppb (16) | 3.7 ppb (3) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 19, 2019, noon | 30.0 ppb (28) | 10.9 ppb (10) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.37 ppb (4) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 19, 2019, 11 a.m. | 22.7 ppb (21) | 4.5 ppb (4) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 4.0 μg/m3 (17) | 21.0 | |
| May 19, 2019, 10 a.m. | 15.6 ppb (14) | 2.2 ppb (2) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 19, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 19, 2019, 8 a.m. | 21.9 ppb (20) | 3.6 ppb (3) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 4.0 μg/m3 (17) | 20.0 | |
| May 19, 2019, 7 a.m. | 32.3 ppb (30) | 8.9 ppb (8) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 5.0 μg/m3 (21) | 30.0 | |
| May 19, 2019, 6 a.m. | 33.4 ppb (31) | 9.7 ppb (9) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 5 a.m. | 19.2 ppb (18) | 0.6 ppb (1) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 4 a.m. | 15.7 ppb (15) | 1.4 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 19, 2019, 3 a.m. | 9.9 ppb (9) | 1.2 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 19, 2019, 2 a.m. | 8.9 ppb (8) | 1.2 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 19, 2019, 1 a.m. | 10.1 ppb (9) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 2.0 μg/m3 (8) | 9.0 | |
| May 19, 2019, midnight | 22.4 ppb (21) | 8.9 ppb (8) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 1.0 μg/m3 (4) | 21.0 | |
| May 18, 2019, 11 p.m. | 39.1 ppb (36) | 18.6 ppb (17) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.47 ppb (5) | N/A | 3.0 μg/m3 (12) | 36.0 | |
| May 18, 2019, 10 p.m. | 36.7 ppb (34) | 19.4 ppb (18) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 5.0 μg/m3 (21) | 34.0 | |
| May 18, 2019, 9 p.m. | 26.8 ppb (25) | 13.3 ppb (12) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.42 ppb (5) | N/A | 2.0 μg/m3 (8) | 25.0 | |
| May 18, 2019, 8 p.m. | 38.4 ppb (36) | 20.0 ppb (19) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.38 ppb (4) | N/A | 2.0 μg/m3 (8) | 36.0 | |
| May 18, 2019, 7 p.m. | 48.9 ppb (45) | 27.8 ppb (26) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.39 ppb (4) | N/A | 3.0 μg/m3 (12) | 45.0 | |
| May 18, 2019, 6 p.m. | 52.3 ppb (48) | 31.3 ppb (29) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 4.0 μg/m3 (17) | 48.0 |