Missoula MT, US: 46.842297, -114.020549
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| May 25, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | 8.0 μg/m3 (7) | 4.7 μg/m3 (20) | 20.0 | |
| May 25, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 9.0 μg/m3 (8) | 3.5 μg/m3 (15) | 16.0 | |
| May 25, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 8.0 μg/m3 (7) | 1.3 μg/m3 (5) | 19.0 | |
| May 25, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | 6.0 μg/m3 (5) | 1.3 μg/m3 (5) | 22.0 | |
| May 25, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | 41.0 μg/m3 (37) | 2.3 μg/m3 (10) | 37.0 | |
| May 24, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | 18.0 μg/m3 (16) | 3.8 μg/m3 (16) | 25.0 | |
| May 24, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | 20.0 μg/m3 (18) | 5.7 μg/m3 (24) | 24.0 | |
| May 24, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | 19.0 μg/m3 (17) | 6.2 μg/m3 (26) | 26.0 | |
| May 24, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | 25.0 μg/m3 (23) | 5.3 μg/m3 (22) | 24.0 | |
| May 24, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | 15.0 μg/m3 (14) | 4.5 μg/m3 (19) | 25.0 | |
| May 24, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | 20.0 μg/m3 (18) | 6.7 μg/m3 (28) | 28.0 | |
| May 24, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | 18.0 μg/m3 (16) | 6.9 μg/m3 (29) | 29.0 | |
| May 24, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 22.0 μg/m3 (20) | 7.1 μg/m3 (30) | 30.0 | |
| May 24, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | 36.0 μg/m3 (33) | 9.5 μg/m3 (40) | 40.0 | |
| May 24, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | 39.0 μg/m3 (35) | 11.2 μg/m3 (47) | 47.0 | |
| May 24, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | 32.0 μg/m3 (29) | 10.5 μg/m3 (44) | 44.0 | |
| May 24, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | 18.0 μg/m3 (16) | 7.4 μg/m3 (31) | 31.0 | |
| May 24, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | 13.0 μg/m3 (12) | 7.6 μg/m3 (32) | 32.0 | |
| May 24, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | 18.0 μg/m3 (16) | 8.8 μg/m3 (37) | 37.0 | |
| May 24, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 19.0 μg/m3 (17) | 6.9 μg/m3 (29) | 29.0 | |
| May 24, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | 30.0 μg/m3 (27) | 5.0 μg/m3 (21) | 27.0 | |
| May 24, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 21.0 μg/m3 (19) | 5.7 μg/m3 (24) | 24.0 | |
| May 24, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 22.0 μg/m3 (20) | 8.6 μg/m3 (36) | 36.0 | |
| May 24, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | 21.0 μg/m3 (19) | 7.8 μg/m3 (32) | 32.0 | |
| May 24, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | 26.0 μg/m3 (24) | 5.9 μg/m3 (25) | 25.0 | |
| May 24, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | 29.0 μg/m3 (26) | 5.7 μg/m3 (24) | 26.0 | |
| May 24, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | 25.0 μg/m3 (23) | 5.0 μg/m3 (21) | 25.0 | |
| May 24, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | 16.0 μg/m3 (15) | 6.2 μg/m3 (26) | 28.0 | |
| May 24, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | 18.0 μg/m3 (16) | 7.6 μg/m3 (32) | 32.0 | |
| May 23, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | 25.0 μg/m3 (23) | 7.3 μg/m3 (30) | 30.0 | |
| May 23, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | 16.0 μg/m3 (15) | 5.2 μg/m3 (22) | 29.0 | |
| May 23, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | 17.0 μg/m3 (15) | 4.8 μg/m3 (20) | 28.0 | |
| May 23, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | 15.0 μg/m3 (14) | 6.0 μg/m3 (25) | 27.0 | |
| May 23, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | 21.0 μg/m3 (19) | 6.2 μg/m3 (26) | 26.0 | |
| May 23, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | 34.0 μg/m3 (31) | 8.1 μg/m3 (34) | 34.0 | |
| May 23, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | N/A | 14.0 | |
| May 23, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | N/A | 10.0 | |
| May 23, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | 25.0 μg/m3 (23) | 10.5 μg/m3 (44) | 44.0 | |
| May 23, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | 34.0 μg/m3 (31) | 9.3 μg/m3 (39) | 39.0 | |
| May 23, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | N/A | 32.0 μg/m3 (29) | 5.9 μg/m3 (25) | 29.0 | |
| May 23, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | N/A | 25.0 μg/m3 (23) | 3.0 μg/m3 (12) | 23.0 | |
| May 23, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | 12.0 μg/m3 (11) | 5.0 μg/m3 (21) | 21.0 | |
| May 23, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | 16.0 μg/m3 (15) | 3.7 μg/m3 (15) | 15.0 | |
| May 23, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | 11.0 μg/m3 (10) | 0.0 μg/m3 (0) | 10.0 | |
| May 23, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | 9.0 μg/m3 (8) | 3.3 μg/m3 (14) | 14.0 | |
| May 23, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | 12.0 μg/m3 (11) | 6.6 μg/m3 (28) | 28.0 | |
| May 23, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | 15.0 μg/m3 (14) | 6.7 μg/m3 (28) | 28.0 | |
| May 23, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 15.0 μg/m3 (14) | 3.8 μg/m3 (16) | 16.0 | |
| May 23, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | 26.0 μg/m3 (24) | 6.4 μg/m3 (27) | 27.0 | |
| May 23, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | 18.0 μg/m3 (16) | 8.1 μg/m3 (34) | 34.0 | |
| May 23, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | 21.0 μg/m3 (19) | 5.0 μg/m3 (21) | 25.0 | |
| May 23, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 12.0 μg/m3 (11) | 5.0 μg/m3 (21) | 26.0 | |
| May 23, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 13.0 μg/m3 (12) | 5.0 μg/m3 (21) | 26.0 | |
| May 22, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 14.0 μg/m3 (13) | 5.5 μg/m3 (23) | 26.0 | |
| May 22, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 18.0 μg/m3 (16) | 6.0 μg/m3 (25) | 26.0 | |
| May 22, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | 16.0 μg/m3 (15) | 4.0 μg/m3 (17) | 25.0 | |
| May 22, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 18.0 μg/m3 (16) | 3.3 μg/m3 (14) | 26.0 | |
| May 22, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | 25.0 μg/m3 (23) | 4.0 μg/m3 (17) | 25.0 | |
| May 22, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | 18.0 μg/m3 (16) | 3.0 μg/m3 (12) | 23.0 | |
| May 22, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | 12.0 μg/m3 (11) | 2.6 μg/m3 (11) | 22.0 | |
| May 22, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (8) | 2.0 μg/m3 (8) | 8.0 | |
| May 22, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (5) | 2.8 μg/m3 (12) | 12.0 | |
| May 22, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | 9.0 μg/m3 (8) | 4.0 μg/m3 (17) | 22.0 | |
| May 22, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 11.0 μg/m3 (10) | 4.7 μg/m3 (20) | 20.0 | |
| May 22, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | 6.0 μg/m3 (5) | 4.2 μg/m3 (18) | 18.0 | |
| May 22, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 3.0 μg/m3 (3) | 1.8 μg/m3 (8) | 12.0 | |
| May 22, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | 3.0 μg/m3 (3) | 1.1 μg/m3 (5) | 14.0 | |
| May 22, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 1.0 μg/m3 (1) | 0.6 μg/m3 (2) | 15.0 | |
| May 22, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | 2.0 μg/m3 (2) | -0.1 μg/m3 (0) | 15.0 | |
| May 22, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | 6.0 μg/m3 (5) | 0.6 μg/m3 (2) | 13.0 | |
| May 22, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 5.0 μg/m3 (5) | 0.8 μg/m3 (3) | 12.0 | |
| May 22, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 2.0 μg/m3 (2) | 0.8 μg/m3 (3) | 12.0 | |
| May 22, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | 0.0 μg/m3 (0) | 0.3 μg/m3 (1) | 13.0 | |
| May 22, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | 6.0 μg/m3 (5) | 3.5 μg/m3 (15) | 15.0 | |
| May 22, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 14.0 μg/m3 (13) | 7.3 μg/m3 (30) | 30.0 | |
| May 22, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 27.0 μg/m3 (25) | 4.8 μg/m3 (20) | 25.0 | |
| May 22, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 30.0 μg/m3 (27) | 2.5 μg/m3 (10) | 27.0 | |
| May 21, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 12.0 μg/m3 (11) | 2.6 μg/m3 (11) | 19.0 | |
| May 21, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 13.0 μg/m3 (12) | 3.5 μg/m3 (15) | 19.0 | |
| May 21, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | 7.0 μg/m3 (6) | 1.8 μg/m3 (8) | 17.0 | |
| May 21, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 7.0 μg/m3 (6) | 0.6 μg/m3 (2) | 15.0 | |
| May 21, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | 13.0 μg/m3 (12) | 0.1 μg/m3 (0) | 15.0 | |
| May 21, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | 11.0 μg/m3 (10) | 1.1 μg/m3 (5) | 14.0 | |
| May 21, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 7.0 μg/m3 (6) | 3.8 μg/m3 (16) | 16.0 | |
| May 21, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | 5.0 μg/m3 (5) | 3.0 μg/m3 (12) | 12.0 | |
| May 21, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | 8.0 μg/m3 (7) | 3.8 μg/m3 (16) | 16.0 | |
| May 21, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 9.0 μg/m3 (8) | 4.3 μg/m3 (18) | 18.0 | |
| May 21, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 2.0 μg/m3 (2) | 2.0 μg/m3 (8) | 12.0 | |
| May 21, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | -3.0 μg/m3 (0) | -0.8 μg/m3 (0) | 14.0 | |
| May 21, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 1.0 μg/m3 (1) | -1.8 μg/m3 (0) | 15.0 | |
| May 21, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 3.0 μg/m3 (3) | -1.1 μg/m3 (0) | 15.0 | |
| May 21, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 1.0 μg/m3 (1) | 0.3 μg/m3 (1) | 16.0 | |
| May 21, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | 4.0 μg/m3 (4) | 3.0 μg/m3 (12) | 17.0 | |
| May 21, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 3.0 μg/m3 (3) | 2.3 μg/m3 (10) | 18.0 | |
| May 21, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 2.0 μg/m3 (2) | 0.1 μg/m3 (0) | 18.0 | |
| May 21, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 2.0 μg/m3 (2) | -0.1 μg/m3 (0) | 19.0 | |
| May 21, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | 3.0 μg/m3 (3) | 2.1 μg/m3 (9) | 20.0 | |
| May 21, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | 7.0 μg/m3 (6) | 3.8 μg/m3 (16) | 20.0 | |
| May 21, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 9.0 μg/m3 (8) | 3.1 μg/m3 (13) | 19.0 | |
| May 21, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 10.0 μg/m3 (9) | 2.0 μg/m3 (8) | 18.0 | |
| May 21, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 11.0 μg/m3 (10) | 3.0 μg/m3 (12) | 18.0 | |
| May 20, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 12.0 μg/m3 (11) | 3.3 μg/m3 (14) | 18.0 | |
| May 20, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 30.0 μg/m3 (27) | 1.3 μg/m3 (5) | 27.0 | |
| May 20, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 13.0 μg/m3 (12) | 0.1 μg/m3 (0) | 18.0 | |
| May 20, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 14.0 μg/m3 (13) | 0.8 μg/m3 (3) | 18.0 | |
| May 20, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 17.0 μg/m3 (15) | 2.3 μg/m3 (10) | 18.0 | |
| May 20, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 12.0 μg/m3 (11) | 5.2 μg/m3 (22) | 22.0 | |
| May 20, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 13.0 μg/m3 (12) | 4.0 μg/m3 (17) | 19.0 | |
| May 20, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | 13.0 μg/m3 (12) | 0.1 μg/m3 (0) | 20.0 | |
| May 20, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | 12.0 μg/m3 (11) | 1.5 μg/m3 (6) | 21.0 | |
| May 20, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | 10.0 μg/m3 (9) | 2.7 μg/m3 (11) | 21.0 | |
| May 20, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | 7.0 μg/m3 (6) | 2.0 μg/m3 (8) | 21.0 | |
| May 20, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | 6.0 μg/m3 (5) | 2.5 μg/m3 (10) | 22.0 | |
| May 20, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | 8.0 μg/m3 (7) | 4.0 μg/m3 (17) | 23.0 | |
| May 20, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | 8.0 μg/m3 (7) | 3.3 μg/m3 (14) | 24.0 | |
| May 20, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | 4.0 μg/m3 (4) | 0.3 μg/m3 (1) | 24.0 | |
| May 20, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | 4.0 μg/m3 (4) | -0.6 μg/m3 (0) | 24.0 | |
| May 20, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | 4.0 μg/m3 (4) | 1.1 μg/m3 (5) | 23.0 | |
| May 20, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | 3.0 μg/m3 (3) | 2.8 μg/m3 (12) | 22.0 | |
| May 20, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | 6.0 μg/m3 (5) | 2.5 μg/m3 (10) | 21.0 | |
| May 20, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | 6.0 μg/m3 (5) | 0.1 μg/m3 (0) | 20.0 | |
| May 20, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | 7.0 μg/m3 (6) | 0.6 μg/m3 (2) | 21.0 | |
| May 20, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | 6.0 μg/m3 (5) | 1.1 μg/m3 (5) | 21.0 | |
| May 20, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | 4.0 μg/m3 (4) | 1.3 μg/m3 (5) | 20.0 | |
| May 20, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | 8.0 μg/m3 (7) | 2.8 μg/m3 (12) | 20.0 | |
| May 19, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | 12.0 μg/m3 (11) | 3.0 μg/m3 (12) | 20.0 | |
| May 19, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 17.0 μg/m3 (15) | 1.1 μg/m3 (5) | 19.0 | |
| May 19, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 11.0 μg/m3 (10) | 0.1 μg/m3 (0) | 18.0 | |
| May 19, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 13.0 μg/m3 (12) | 0.8 μg/m3 (3) | 18.0 | |
| May 19, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 13.0 μg/m3 (12) | 2.3 μg/m3 (10) | 18.0 | |
| May 19, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 10.0 μg/m3 (9) | 2.1 μg/m3 (9) | 16.0 | |
| May 19, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 6.0 μg/m3 (5) | 1.1 μg/m3 (5) | 16.0 | |
| May 19, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 6.0 μg/m3 (5) | 0.6 μg/m3 (2) | 16.0 | |
| May 19, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 3.0 μg/m3 (3) | -0.1 μg/m3 (0) | 16.0 | |
| May 19, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | 0.0 μg/m3 (0) | 0.3 μg/m3 (1) | 17.0 | |
| May 19, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 1.0 μg/m3 (1) | 0.8 μg/m3 (3) | 18.0 | |
| May 19, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 0.0 μg/m3 (0) | 1.3 μg/m3 (5) | 19.0 | |
| May 19, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 3.0 μg/m3 (3) | 0.5 μg/m3 (2) | 19.0 | |
| May 19, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 5.0 μg/m3 (5) | -0.6 μg/m3 (0) | 19.0 | |
| May 19, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 3.0 μg/m3 (3) | -1.3 μg/m3 (0) | 19.0 | |
| May 19, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 1.0 μg/m3 (1) | -2.5 μg/m3 (0) | 18.0 | |
| May 19, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 2.0 μg/m3 (2) | -3.3 μg/m3 (0) | 18.0 | |
| May 19, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 4.0 μg/m3 (4) | -0.6 μg/m3 (0) | 19.0 | |
| May 19, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 3.0 μg/m3 (3) | 2.5 μg/m3 (10) | 19.0 | |
| May 19, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 2.0 μg/m3 (2) | 0.8 μg/m3 (3) | 18.0 | |
| May 19, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 5.0 μg/m3 (5) | 0.3 μg/m3 (1) | 18.0 | |
| May 19, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 9.0 μg/m3 (8) | 1.3 μg/m3 (5) | 16.0 | |
| May 19, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | 7.0 μg/m3 (6) | 0.8 μg/m3 (3) | 15.0 | |
| May 19, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | 5.0 μg/m3 (5) | 1.5 μg/m3 (6) | 13.0 | |
| May 18, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | 3.0 μg/m3 (3) | 2.8 μg/m3 (12) | 14.0 | |
| May 18, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 5.0 μg/m3 (5) | 4.0 μg/m3 (17) | 17.0 | |
| May 18, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 6.0 μg/m3 (5) | 3.3 μg/m3 (14) | 15.0 | |
| May 18, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 3.0 μg/m3 (3) | 0.8 μg/m3 (3) | 15.0 | |
| May 18, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | 6.0 μg/m3 (5) | 1.8 μg/m3 (8) | 15.0 | |
| May 18, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | 7.0 μg/m3 (6) | 3.3 μg/m3 (14) | 15.0 | |
| May 18, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | 5.0 μg/m3 (5) | 0.3 μg/m3 (1) | 14.0 | |
| May 18, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 6.0 μg/m3 (5) | -0.8 μg/m3 (0) | 12.0 | |
| May 18, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | 5.0 μg/m3 (5) | 1.0 μg/m3 (4) | 11.0 | |
| May 18, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | -1.0 μg/m3 (0) | 1.0 μg/m3 (4) | 9.0 | |
| May 18, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 0.0 μg/m3 (0) | 0.1 μg/m3 (0) | 8.0 | |
| May 18, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 5.0 μg/m3 (5) | 1.3 μg/m3 (5) | 8.0 | |
| May 18, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | 5.0 μg/m3 (5) | 2.5 μg/m3 (10) | 10.0 | |
| May 18, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | 3.0 μg/m3 (3) | 2.0 μg/m3 (8) | 9.0 | |
| May 18, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | -1.0 μg/m3 (0) | 1.1 μg/m3 (5) | 10.0 | |
| May 18, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 1.0 μg/m3 (1) | -1.6 μg/m3 (0) | 8.0 | |
| May 18, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | 6.0 μg/m3 (5) | -0.6 μg/m3 (0) | 9.0 | |
| May 18, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | 6.0 μg/m3 (5) | 3.5 μg/m3 (15) | 15.0 | |
| May 18, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 2.0 μg/m3 (2) | 3.8 μg/m3 (16) | 16.0 |