Powder River Co MT, US: 45.440295, -105.37028
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sept. 15, 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) | 1.7 μg/m3 (7) | 12.0 | |
| Sept. 15, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | 4.0 μg/m3 (4) | 1.9 μg/m3 (8) | 14.0 | |
| Sept. 15, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | 13.0 μg/m3 (12) | 2.7 μg/m3 (11) | 12.0 | |
| Sept. 15, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 18.0 μg/m3 (16) | 6.8 μg/m3 (28) | 28.0 | |
| Sept. 15, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 14.0 μg/m3 (13) | 9.5 μg/m3 (40) | 40.0 | |
| Sept. 15, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | 10.0 μg/m3 (9) | 0.5 μg/m3 (2) | 13.0 | |
| Sept. 15, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | 17.0 μg/m3 (15) | 3.8 μg/m3 (16) | 16.0 | |
| Sept. 15, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 24.0 μg/m3 (22) | 5.7 μg/m3 (24) | 24.0 | |
| Sept. 15, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | 32.0 μg/m3 (29) | 13.8 μg/m3 (54) | 54.0 | |
| Sept. 15, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | 21.0 μg/m3 (19) | 4.5 μg/m3 (19) | 22.0 | |
| Sept. 15, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | 10.0 μg/m3 (9) | 2.0 μg/m3 (8) | 27.0 | |
| Sept. 15, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | 47.0 μg/m3 (43) | 10.4 μg/m3 (43) | 43.0 | |
| Sept. 14, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | 82.0 μg/m3 (64) | 14.9 μg/m3 (56) | 64.0 | |
| Sept. 14, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | 56.0 μg/m3 (50) | 4.9 μg/m3 (20) | 50.0 | |
| Sept. 14, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | 26.0 μg/m3 (24) | -0.2 μg/m3 (0) | 32.0 | |
| Sept. 14, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | 13.0 μg/m3 (12) | -2.2 μg/m3 (0) | 32.0 | |
| Sept. 14, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 41.0 ppb (32) | N/A | 2.0 μg/m3 (2) | -3.7 μg/m3 (0) | 32.0 | |
| Sept. 14, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 43.0 ppb (33) | N/A | 3.0 μg/m3 (3) | 3.3 μg/m3 (14) | 33.0 | |
| Sept. 14, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | 11.0 μg/m3 (10) | 11.4 μg/m3 (48) | 48.0 | |
| Sept. 14, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | 2.0 μg/m3 (2) | 8.3 μg/m3 (35) | 35.0 | |
| Sept. 14, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | -3.0 μg/m3 (0) | 3.1 μg/m3 (13) | 20.0 | |
| Sept. 14, 2019, 2 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) | 6.5 μg/m3 (27) | 27.0 | |
| Sept. 14, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | 9.0 μg/m3 (8) | 4.3 μg/m3 (18) | 18.0 | |
| Sept. 14, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | 6.0 μg/m3 (5) | -0.6 μg/m3 (0) | 12.0 | |
| Sept. 14, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | 7.0 μg/m3 (6) | 1.9 μg/m3 (8) | 8.0 | |
| Sept. 14, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | 8.0 μg/m3 (7) | 0.6 μg/m3 (2) | 9.0 | |
| Sept. 14, 2019, 9 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) | 3.9 μg/m3 (16) | 16.0 | |
| Sept. 14, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 9.0 μg/m3 (8) | N/A | 12.0 | |
| Sept. 14, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 4.0 μg/m3 (4) | N/A | 18.0 | |
| Sept. 14, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 13.0 μg/m3 (12) | 3.7 μg/m3 (15) | 15.0 | |
| Sept. 14, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 19.0 μg/m3 (17) | 8.4 μg/m3 (35) | 35.0 | |
| Sept. 14, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | 23.0 μg/m3 (21) | 14.9 μg/m3 (56) | 56.0 | |
| Sept. 14, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | 30.0 μg/m3 (27) | 9.8 μg/m3 (41) | 41.0 | |
| Sept. 14, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 35.0 μg/m3 (32) | 3.5 μg/m3 (15) | 32.0 | |
| Sept. 14, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 28.0 μg/m3 (25) | 4.2 μg/m3 (18) | 26.0 | |
| Sept. 14, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | 59.0 μg/m3 (52) | 19.7 μg/m3 (66) | 66.0 | |
| Sept. 13, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | 46.0 μg/m3 (42) | 18.7 μg/m3 (64) | 64.0 | |
| Sept. 13, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | 30.0 μg/m3 (27) | 5.6 μg/m3 (23) | 31.0 | |
| Sept. 13, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | 17.0 μg/m3 (15) | -0.3 μg/m3 (0) | 30.0 | |
| Sept. 13, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | 8.0 μg/m3 (7) | 2.2 μg/m3 (9) | 30.0 | |
| Sept. 13, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | 0.0 μg/m3 (0) | -2.5 μg/m3 (0) | 28.0 | |
| Sept. 13, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | 1.0 μg/m3 (1) | N/A | 28.0 | |
| Sept. 13, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | 4.0 μg/m3 (4) | 0.6 μg/m3 (2) | 25.0 | |
| Sept. 13, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | 5.0 μg/m3 (5) | 8.8 μg/m3 (37) | 37.0 | |
| Sept. 13, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 9.0 μg/m3 (8) | 12.8 μg/m3 (52) | 52.0 | |
| Sept. 13, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | 8.0 μg/m3 (7) | 11.8 μg/m3 (49) | 49.0 | |
| Sept. 13, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | 6.0 μg/m3 (5) | 7.6 μg/m3 (32) | 32.0 | |
| Sept. 13, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 4.0 μg/m3 (4) | 2.7 μg/m3 (11) | 11.0 | |
| Sept. 13, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 7.0 μg/m3 (6) | 10.3 μg/m3 (43) | 43.0 | |
| Sept. 13, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | 6.0 μg/m3 (5) | 10.6 μg/m3 (44) | 44.0 | |
| Sept. 13, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | 9.0 μg/m3 (8) | 1.0 μg/m3 (4) | 8.0 | |
| Sept. 13, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | 9.0 μg/m3 (8) | 9.8 μg/m3 (41) | 41.0 | |
| Sept. 13, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | 6.0 μg/m3 (5) | 7.7 μg/m3 (32) | 32.0 | |
| Sept. 13, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | 5.0 μg/m3 (5) | -3.5 μg/m3 (0) | 8.0 | |
| Sept. 13, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | 4.0 μg/m3 (4) | N/A | 8.0 | |
| Sept. 13, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | 4.0 μg/m3 (4) | -0.1 μg/m3 (0) | 11.0 | |
| Sept. 13, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | 3.0 μg/m3 (3) | -1.2 μg/m3 (0) | 12.0 | |
| Sept. 13, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 0.0 μg/m3 (0) | N/A | 15.0 | |
| Sept. 13, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 4.0 μg/m3 (4) | -0.9 μg/m3 (0) | 18.0 | |
| Sept. 13, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | 1.0 μg/m3 (1) | -2.8 μg/m3 (0) | 20.0 | |
| Sept. 12, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | 0.0 μg/m3 (0) | 4.8 μg/m3 (20) | 21.0 | |
| Sept. 12, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | 0.0 μg/m3 (0) | 0.8 μg/m3 (3) | 20.0 | |
| Sept. 12, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | -3.0 μg/m3 (0) | 4.4 μg/m3 (18) | 20.0 | |
| Sept. 12, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 3.5 μg/m3 (15) | 18.0 | |
| Sept. 12, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 3.8 μg/m3 (16) | 16.0 | |
| Sept. 12, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 16.0 μg/m3 (15) | 2.4 μg/m3 (10) | 15.0 | |
| Sept. 12, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | 33.0 μg/m3 (30) | 6.6 μg/m3 (28) | 30.0 | |
| Sept. 12, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | 0.0 μg/m3 (0) | 3.1 μg/m3 (13) | 13.0 | |
| Sept. 12, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | N/A | 10.7 μg/m3 (45) | 45.0 | |
| Sept. 12, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | -4.0 μg/m3 (0) | 4.8 μg/m3 (20) | 20.0 | |
| Sept. 12, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | -4.0 μg/m3 (0) | -1.9 μg/m3 (0) | 10.0 | |
| Sept. 12, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 0.0 μg/m3 (0) | 10.0 | |
| Sept. 12, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | N/A | -0.5 μg/m3 (0) | 9.0 | |
| Sept. 12, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | N/A | 0.6 μg/m3 (2) | 9.0 | |
| Sept. 12, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | 15.0 μg/m3 (14) | -4.4 μg/m3 (0) | 14.0 | |
| Sept. 12, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | 36.0 μg/m3 (33) | -4.3 μg/m3 (0) | 33.0 | |
| Sept. 12, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | -4.0 μg/m3 (0) | N/A | 10.0 | |
| Sept. 12, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | -4.0 μg/m3 (0) | -3.8 μg/m3 (0) | 10.0 | |
| Sept. 12, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | N/A | 11.0 | |
| Sept. 12, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | 0.0 μg/m3 (0) | -7.3 μg/m3 (0) | 11.0 | |
| Sept. 12, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 3.0 μg/m3 (3) | -2.0 μg/m3 (0) | 16.0 | |
| Sept. 12, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | 6.0 μg/m3 (5) | -0.7 μg/m3 (0) | 19.0 | |
| Sept. 12, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | 9.0 μg/m3 (8) | 6.3 μg/m3 (26) | 26.0 | |
| Sept. 12, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | 13.0 μg/m3 (12) | 14.2 μg/m3 (55) | 55.0 | |
| Sept. 11, 2019, 11 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) | 16.0 μg/m3 (59) | 59.0 | |
| Sept. 11, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | -2.0 μg/m3 (0) | -3.7 μg/m3 (0) | 22.0 | |
| Sept. 11, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | 6.0 μg/m3 (5) | 11.6 μg/m3 (48) | 48.0 | |
| Sept. 11, 2019, 8 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) | 1.4 μg/m3 (6) | 17.0 | |
| Sept. 11, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | 3.0 μg/m3 (3) | 3.8 μg/m3 (16) | 22.0 | |
| Sept. 11, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 9.0 μg/m3 (8) | 0.8 μg/m3 (3) | 18.0 | |
| Sept. 11, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 9.0 μg/m3 (8) | 3.0 μg/m3 (12) | 16.0 | |
| Sept. 11, 2019, 4 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) | 3.8 μg/m3 (16) | 16.0 | |
| Sept. 11, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | 9.0 μg/m3 (8) | 5.7 μg/m3 (24) | 24.0 | |
| Sept. 11, 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) | 0.1 μg/m3 (0) | 12.0 | |
| Sept. 11, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | 4.0 μg/m3 (4) | -0.5 μg/m3 (0) | 13.0 | |
| Sept. 11, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 4.0 μg/m3 (4) | 2.6 μg/m3 (11) | 16.0 | |
| Sept. 11, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | 7.0 μg/m3 (6) | 1.8 μg/m3 (8) | 14.0 | |
| Sept. 11, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 9.0 μg/m3 (8) | 0.2 μg/m3 (1) | 15.0 | |
| Sept. 11, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 11.0 μg/m3 (10) | 5.0 μg/m3 (21) | 21.0 | |
| Sept. 11, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 4.0 μg/m3 (4) | 4.8 μg/m3 (20) | 20.0 | |
| Sept. 11, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | 9.0 μg/m3 (8) | 4.8 μg/m3 (20) | 20.0 | |
| Sept. 11, 2019, 6 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) | -2.9 μg/m3 (0) | 15.0 | |
| Sept. 11, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 0.0 μg/m3 (0) | 0.7 μg/m3 (3) | 16.0 | |
| Sept. 11, 2019, 4 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) | 1.0 μg/m3 (4) | 19.0 | |
| Sept. 11, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | 2.0 μg/m3 (2) | 1.8 μg/m3 (8) | 22.0 | |
| Sept. 11, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | 14.0 μg/m3 (13) | 1.9 μg/m3 (8) | 22.0 | |
| Sept. 11, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | 46.0 μg/m3 (42) | 5.3 μg/m3 (22) | 42.0 | |
| Sept. 11, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | 53.0 μg/m3 (48) | 8.1 μg/m3 (34) | 48.0 | |
| Sept. 10, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 23.0 μg/m3 (21) | 12.9 μg/m3 (52) | 52.0 | |
| Sept. 10, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 37.0 μg/m3 (34) | 4.1 μg/m3 (17) | 34.0 | |
| Sept. 10, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | 48.0 μg/m3 (44) | 5.2 μg/m3 (22) | 44.0 | |
| Sept. 10, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 84.0 μg/m3 (64) | 15.6 μg/m3 (58) | 64.0 | |
| Sept. 10, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 47.0 μg/m3 (43) | 8.8 μg/m3 (37) | 43.0 | |
| Sept. 10, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | 44.0 μg/m3 (40) | 8.2 μg/m3 (34) | 40.0 | |
| Sept. 10, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 24.0 μg/m3 (22) | 5.2 μg/m3 (22) | 26.0 | |
| Sept. 10, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | 39.0 μg/m3 (35) | 1.7 μg/m3 (7) | 35.0 | |
| Sept. 10, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 73.0 μg/m3 (59) | 20.7 μg/m3 (69) | 69.0 | |
| Sept. 10, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | 118.0 μg/m3 (82) | 26.5 μg/m3 (81) | 82.0 | |
| Sept. 10, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | 52.0 μg/m3 (47) | 11.0 μg/m3 (46) | 47.0 | |
| Sept. 10, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | 27.0 μg/m3 (25) | 3.3 μg/m3 (14) | 25.0 | |
| Sept. 10, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | 8.0 μg/m3 (7) | -1.4 μg/m3 (0) | 7.0 | |
| Sept. 10, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | 8.0 μg/m3 (7) | -0.6 μg/m3 (0) | 7.0 | |
| Sept. 10, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | 9.0 μg/m3 (8) | -1.4 μg/m3 (0) | 8.0 | |
| Sept. 10, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 4.0 μg/m3 (4) | 5.1 μg/m3 (21) | 21.0 | |
| Sept. 10, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | 0.0 μg/m3 (0) | 9.4 μg/m3 (39) | 39.0 | |
| Sept. 10, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | 11.0 μg/m3 (10) | 1.1 μg/m3 (5) | 13.0 | |
| Sept. 10, 2019, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | 26.0 μg/m3 (24) | -0.1 μg/m3 (0) | 24.0 | |
| Sept. 10, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 54.0 μg/m3 (49) | 3.0 μg/m3 (12) | 49.0 | |
| Sept. 10, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 118.0 μg/m3 (82) | 23.3 μg/m3 (74) | 82.0 | |
| Sept. 10, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | 74.0 μg/m3 (60) | 9.6 μg/m3 (40) | 60.0 | |
| Sept. 10, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | 60.0 μg/m3 (52) | 9.9 μg/m3 (41) | 52.0 | |
| Sept. 10, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | 46.0 μg/m3 (42) | 5.1 μg/m3 (21) | 42.0 | |
| Sept. 9, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | 37.0 μg/m3 (34) | -2.1 μg/m3 (0) | 34.0 | |
| Sept. 9, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | 30.0 μg/m3 (27) | 5.5 μg/m3 (23) | 28.0 | |
| Sept. 9, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | 32.0 μg/m3 (29) | 4.7 μg/m3 (20) | 29.0 | |
| Sept. 9, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | 34.0 μg/m3 (31) | 0.3 μg/m3 (1) | 31.0 | |
| Sept. 9, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | 20.0 μg/m3 (18) | -1.6 μg/m3 (0) | 28.0 | |
| Sept. 9, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | 17.0 μg/m3 (15) | 5.2 μg/m3 (22) | 30.0 | |
| Sept. 9, 2019, 5 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) | 6.5 μg/m3 (27) | 27.0 | |
| Sept. 9, 2019, 4 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) | 14.4 μg/m3 (55) | 55.0 | |
| Sept. 9, 2019, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 15.0 μg/m3 (14) | 24.0 μg/m3 (76) | 76.0 | |
| Sept. 9, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | 35.0 μg/m3 (32) | 20.0 μg/m3 (67) | 67.0 | |
| Sept. 9, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | 13.0 μg/m3 (12) | -4.5 μg/m3 (0) | 12.0 | |
| Sept. 9, 2019, noon | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | 2.0 μg/m3 (2) | 0.4 μg/m3 (2) | 8.0 | |
| Sept. 9, 2019, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | 6.0 μg/m3 (5) | -0.5 μg/m3 (0) | 10.0 | |
| Sept. 9, 2019, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | 6.0 μg/m3 (5) | 2.0 μg/m3 (8) | 11.0 | |
| Sept. 9, 2019, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 4.0 μg/m3 (4) | -0.5 μg/m3 (0) | 12.0 | |
| Sept. 9, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | 1.0 μg/m3 (1) | 6.8 μg/m3 (28) | 28.0 | |
| Sept. 9, 2019, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | 0.0 μg/m3 (0) | 9.4 μg/m3 (39) | 39.0 | |
| Sept. 9, 2019, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | 5.0 μg/m3 (5) | 0.9 μg/m3 (4) | 14.0 | |
| Sept. 9, 2019, 5 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) | 3.6 μg/m3 (15) | 15.0 | |
| Sept. 9, 2019, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 4.0 μg/m3 (4) | 1.0 μg/m3 (4) | 15.0 | |
| Sept. 9, 2019, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 5.0 μg/m3 (5) | 1.9 μg/m3 (8) | 15.0 | |
| Sept. 9, 2019, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | 5.0 μg/m3 (5) | -0.6 μg/m3 (0) | 15.0 | |
| Sept. 9, 2019, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 8.0 μg/m3 (7) | -0.2 μg/m3 (0) | 16.0 | |
| Sept. 9, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | 7.0 μg/m3 (6) | 2.9 μg/m3 (12) | 17.0 | |
| Sept. 8, 2019, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | 6.0 μg/m3 (5) | N/A | 17.0 | |
| Sept. 8, 2019, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | 1.0 μg/m3 (1) | N/A | 16.0 | |
| Sept. 8, 2019, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 4.0 μg/m3 (4) | 0.7 μg/m3 (3) | 18.0 | |
| Sept. 8, 2019, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | 0.0 μg/m3 (0) | 3.0 μg/m3 (12) | 18.0 | |
| Sept. 8, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | 2.0 μg/m3 (2) | -1.0 μg/m3 (0) | 18.0 | |
| Sept. 8, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | -1.0 μg/m3 (0) | -0.3 μg/m3 (0) | 17.0 | |
| Sept. 8, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | -1.0 μg/m3 (0) | 0.1 μg/m3 (0) | 15.0 | |
| Sept. 8, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | -2.0 μg/m3 (0) | -0.4 μg/m3 (0) | 15.0 | |
| Sept. 8, 2019, 3 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) | 14.4 μg/m3 (55) | 55.0 | |
| Sept. 8, 2019, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | 6.0 μg/m3 (5) | 5.6 μg/m3 (23) | 23.0 | |
| Sept. 8, 2019, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | 1.0 μg/m3 (1) | 0.0 μg/m3 (0) | 12.0 | |
| Sept. 8, 2019, noon | 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 |