Chester (S Chester) PA, US: 39.8356, -75.3725
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sept. 19, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 2.6 μg/m3 (11) | 17.0 | |
| Sept. 19, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 2.6 μg/m3 (11) | 18.0 | |
| Sept. 19, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 2.8 μg/m3 (12) | 12.0 | |
| Sept. 19, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 2.9 μg/m3 (12) | 20.0 | |
| Sept. 19, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 3.0 μg/m3 (12) | 21.0 | |
| Sept. 19, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 3.2 μg/m3 (13) | 22.0 | |
| Sept. 19, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 3.7 μg/m3 (15) | 22.0 | |
| Sept. 19, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 4.3 μg/m3 (18) | 22.0 | |
| Sept. 19, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 4.4 μg/m3 (18) | 23.0 | |
| Sept. 18, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 8.4 μg/m3 (35) | 35.0 | |
| Sept. 18, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 13.7 μg/m3 (54) | 54.0 | |
| Sept. 18, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 17.0 μg/m3 (61) | 61.0 | |
| Sept. 18, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 17.9 μg/m3 (63) | 63.0 | |
| Sept. 18, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 14.2 μg/m3 (55) | 55.0 | |
| Sept. 18, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 11.9 μg/m3 (50) | 50.0 | |
| Sept. 18, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 10.6 μg/m3 (44) | 44.0 | |
| Sept. 18, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 10.4 μg/m3 (43) | 43.0 | |
| Sept. 18, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 9.5 μg/m3 (40) | 40.0 | |
| Sept. 18, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 8.7 μg/m3 (36) | 36.0 | |
| Sept. 18, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 8.1 μg/m3 (34) | 34.0 | |
| Sept. 18, 2020, noon | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 10.4 μg/m3 (43) | 43.0 | |
| Sept. 18, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 13.1 μg/m3 (52) | 52.0 | |
| Sept. 18, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 ppb (7) | N/A | N/A | 10.7 μg/m3 (45) | 45.0 | |
| Sept. 18, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Sept. 18, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 10.5 μg/m3 (44) | 44.0 | |
| Sept. 18, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 6.2 μg/m3 (26) | 26.0 | |
| Sept. 18, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 4.5 μg/m3 (19) | 19.0 | |
| Sept. 18, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 4.4 μg/m3 (18) | 25.0 | |
| Sept. 18, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 4.3 μg/m3 (18) | 22.0 | |
| Sept. 18, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 4.8 μg/m3 (20) | 20.0 | |
| Sept. 18, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 5.5 μg/m3 (23) | 23.0 | |
| Sept. 18, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 7.9 μg/m3 (33) | 33.0 | |
| Sept. 18, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 11.7 μg/m3 (49) | 49.0 | |
| Sept. 17, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 10.5 μg/m3 (44) | 44.0 | |
| Sept. 17, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 7.5 μg/m3 (31) | 31.0 | |
| Sept. 17, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 7.7 μg/m3 (32) | 32.0 | |
| Sept. 17, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 8.3 μg/m3 (35) | 35.0 | |
| Sept. 17, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 8.8 μg/m3 (37) | 37.0 | |
| Sept. 17, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 9.3 μg/m3 (39) | 39.0 | |
| Sept. 17, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 9.6 μg/m3 (40) | 40.0 | |
| Sept. 17, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 9.6 μg/m3 (40) | 40.0 | |
| Sept. 17, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 ppb (8) | N/A | N/A | 8.8 μg/m3 (37) | 37.0 | |
| Sept. 17, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 6.0 ppb (5) | N/A | N/A | 9.2 μg/m3 (38) | 38.0 | |
| Sept. 17, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 7.9 μg/m3 (33) | 33.0 | |
| Sept. 17, 2020, noon | N/A | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | N/A | N/A | 8.7 μg/m3 (36) | 36.0 | |
| Sept. 17, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | 7.7 μg/m3 (32) | 32.0 | |
| Sept. 17, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | 7.2 μg/m3 (30) | 30.0 | |
| Sept. 17, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | 7.4 μg/m3 (31) | 31.0 | |
| Sept. 17, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 6.8 μg/m3 (28) | 28.0 | |
| Sept. 17, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 3.0 ppb (2) | N/A | N/A | 6.8 μg/m3 (28) | 28.0 | |
| Sept. 17, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 6.4 μg/m3 (27) | 27.0 | |
| Sept. 17, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 6.4 μg/m3 (27) | 27.0 | |
| Sept. 17, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | 6.2 μg/m3 (26) | 26.0 | |
| Sept. 17, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 5.5 μg/m3 (23) | 23.0 | |
| Sept. 17, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 5.4 μg/m3 (23) | 23.0 | |
| Sept. 17, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Sept. 17, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 5.3 μg/m3 (22) | 22.0 | |
| Sept. 16, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 5.1 μg/m3 (21) | 22.0 | |
| Sept. 16, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 4.5 μg/m3 (19) | 25.0 | |
| Sept. 16, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 4.5 μg/m3 (19) | 28.0 | |
| Sept. 16, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 4.5 μg/m3 (19) | 29.0 | |
| Sept. 16, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 4.6 μg/m3 (19) | 28.0 | |
| Sept. 16, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 4.5 μg/m3 (19) | 26.0 | |
| Sept. 16, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 4.8 μg/m3 (20) | 25.0 | |
| Sept. 16, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 7.1 μg/m3 (30) | 30.0 | |
| Sept. 16, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Sept. 16, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 6.5 μg/m3 (27) | 27.0 | |
| Sept. 16, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 4.0 ppb (3) | N/A | N/A | 11.2 μg/m3 (47) | 47.0 | |
| Sept. 16, 2020, noon | N/A | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | N/A | N/A | 7.6 μg/m3 (32) | 32.0 | |
| Sept. 16, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Sept. 16, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | N/A | N/A | 6.4 μg/m3 (27) | 27.0 | |
| Sept. 16, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | N/A | N/A | 6.3 μg/m3 (26) | 26.0 | |
| Sept. 16, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | N/A | N/A | 6.4 μg/m3 (27) | 27.0 | |
| Sept. 16, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 6.6 μg/m3 (28) | 28.0 | |
| Sept. 16, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 6.7 μg/m3 (28) | 28.0 | |
| Sept. 16, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | N/A | N/A | 7.3 μg/m3 (30) | 30.0 | |
| Sept. 16, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | N/A | 6.3 μg/m3 (26) | 26.0 | |
| Sept. 16, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 4.9 μg/m3 (20) | 20.0 | |
| Sept. 16, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 6.7 μg/m3 (28) | 28.0 | |
| Sept. 16, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 2.0 ppb (2) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Sept. 16, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 5.0 ppb (4) | N/A | N/A | 9.7 μg/m3 (40) | 40.0 | |
| Sept. 15, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 4.2 μg/m3 (18) | 19.0 | |
| Sept. 15, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 4.2 μg/m3 (18) | 21.0 | |
| Sept. 15, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 4.1 μg/m3 (17) | 21.0 | |
| Sept. 15, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 3.9 μg/m3 (16) | 25.0 | |
| Sept. 15, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 3.9 μg/m3 (16) | 25.0 | |
| Sept. 15, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 3.7 μg/m3 (15) | 23.0 | |
| Sept. 15, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 4.5 μg/m3 (19) | 21.0 | |
| Sept. 15, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 4.5 μg/m3 (19) | 19.0 | |
| Sept. 15, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 4.6 μg/m3 (19) | 19.0 | |
| Sept. 15, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 4.4 μg/m3 (18) | 18.0 | |
| Sept. 15, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Sept. 15, 2020, noon | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 3.4 μg/m3 (14) | 14.0 | |
| Sept. 15, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | N/A | 2.9 μg/m3 (12) | 12.0 | |
| Sept. 15, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | 2.6 μg/m3 (11) | 11.0 | |
| Sept. 15, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 1.8 μg/m3 (8) | 14.0 | |
| Sept. 15, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 1.9 μg/m3 (8) | 16.0 | |
| Sept. 15, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 2.0 μg/m3 (8) | 18.0 | |
| Sept. 15, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 2.6 μg/m3 (11) | 11.0 | |
| Sept. 15, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 24.0 ppb (18) | N/A | N/A | 2.8 μg/m3 (12) | 18.0 | |
| Sept. 15, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 3.9 μg/m3 (16) | 17.0 | |
| Sept. 15, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 4.6 μg/m3 (19) | 19.0 | |
| Sept. 15, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 4.5 μg/m3 (19) | 19.0 | |
| Sept. 15, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 4.8 μg/m3 (20) | 20.0 | |
| Sept. 15, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 5.4 μg/m3 (23) | 23.0 | |
| Sept. 14, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 5.5 μg/m3 (23) | 23.0 | |
| Sept. 14, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 5.8 μg/m3 (24) | 25.0 | |
| Sept. 14, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 5.7 μg/m3 (24) | 26.0 | |
| Sept. 14, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 5.4 μg/m3 (23) | 28.0 | |
| Sept. 14, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 5.5 μg/m3 (23) | 28.0 | |
| Sept. 14, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 5.3 μg/m3 (22) | 28.0 | |
| Sept. 14, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 5.2 μg/m3 (22) | 28.0 | |
| Sept. 14, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 5.1 μg/m3 (21) | 26.0 | |
| Sept. 14, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 5.4 μg/m3 (23) | 23.0 | |
| Sept. 14, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 5.5 μg/m3 (23) | 23.0 | |
| Sept. 14, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 6.1 μg/m3 (25) | 25.0 | |
| Sept. 14, 2020, noon | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | N/A | 7.1 μg/m3 (30) | 30.0 | |
| Sept. 14, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | N/A | 6.7 μg/m3 (28) | 28.0 | |
| Sept. 14, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 6.6 μg/m3 (28) | 28.0 | |
| Sept. 14, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | N/A | 6.8 μg/m3 (28) | 28.0 | |
| Sept. 14, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 7.0 ppb (5) | N/A | N/A | 6.9 μg/m3 (29) | 29.0 | |
| Sept. 14, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 8.0 ppb (6) | N/A | N/A | 7.2 μg/m3 (30) | 30.0 | |
| Sept. 14, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 6.9 μg/m3 (29) | 29.0 | |
| Sept. 14, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Sept. 14, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 18.0 ppb (14) | N/A | N/A | 6.8 μg/m3 (28) | 28.0 | |
| Sept. 14, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 6.9 μg/m3 (29) | 29.0 | |
| Sept. 14, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 6.5 μg/m3 (27) | 27.0 | |
| Sept. 14, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 6.6 μg/m3 (28) | 28.0 | |
| Sept. 14, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 6.7 μg/m3 (28) | 28.0 | |
| Sept. 13, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 6.8 μg/m3 (28) | 28.0 | |
| Sept. 13, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 7.1 μg/m3 (30) | 30.0 | |
| Sept. 13, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 6.7 μg/m3 (28) | 28.0 | |
| Sept. 13, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 6.8 μg/m3 (28) | 28.0 | |
| Sept. 13, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 34.0 ppb (26) | N/A | N/A | 6.8 μg/m3 (28) | 28.0 | |
| Sept. 13, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 7.1 μg/m3 (30) | 30.0 | |
| Sept. 13, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 7.2 μg/m3 (30) | 30.0 | |
| Sept. 13, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 7.4 μg/m3 (31) | 31.0 | |
| Sept. 13, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 7.8 μg/m3 (32) | 32.0 | |
| Sept. 12, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 5.8 μg/m3 (24) | 25.0 | |
| Sept. 12, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 5.4 μg/m3 (23) | 25.0 | |
| Sept. 12, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 5.1 μg/m3 (21) | 23.0 | |
| Sept. 12, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 4.9 μg/m3 (20) | 22.0 | |
| Sept. 12, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 27.0 ppb (21) | N/A | N/A | 5.7 μg/m3 (24) | 24.0 | |
| Sept. 12, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 6.4 μg/m3 (27) | 27.0 | |
| Sept. 12, 2020, noon | N/A | N/A | N/A | N/A | N/A | N/A | 16.0 ppb (12) | N/A | N/A | 8.3 μg/m3 (35) | 35.0 | |
| Sept. 12, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 14.0 ppb (11) | N/A | N/A | 6.8 μg/m3 (28) | 28.0 | |
| Sept. 12, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 15.0 ppb (12) | N/A | N/A | 6.2 μg/m3 (26) | 26.0 | |
| Sept. 12, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 13.0 ppb (10) | N/A | N/A | 8.9 μg/m3 (37) | 37.0 | |
| Sept. 12, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 ppb (9) | N/A | N/A | 10.7 μg/m3 (45) | 45.0 | |
| Sept. 12, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 11.0 ppb (8) | N/A | N/A | 10.2 μg/m3 (42) | 42.0 | |
| Sept. 12, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 10.5 μg/m3 (44) | 44.0 | |
| Sept. 12, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 19.0 ppb (15) | N/A | N/A | 7.9 μg/m3 (33) | 33.0 | |
| Sept. 12, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 7.3 μg/m3 (30) | 30.0 | |
| Sept. 12, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 8.5 μg/m3 (35) | 35.0 | |
| Sept. 12, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 17.0 ppb (13) | N/A | N/A | 9.7 μg/m3 (40) | 40.0 | |
| Sept. 12, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 21.0 ppb (16) | N/A | N/A | 8.6 μg/m3 (36) | 36.0 | |
| Sept. 12, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 8.6 μg/m3 (36) | 36.0 | |
| Sept. 11, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 20.0 ppb (15) | N/A | N/A | 9.4 μg/m3 (39) | 39.0 | |
| Sept. 11, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 23.0 ppb (18) | N/A | N/A | 10.8 μg/m3 (45) | 45.0 | |
| Sept. 11, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 26.0 ppb (20) | N/A | N/A | 9.7 μg/m3 (40) | 40.0 | |
| Sept. 11, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 7.1 μg/m3 (30) | 30.0 | |
| Sept. 11, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 8.5 μg/m3 (35) | 35.0 | |
| Sept. 11, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 8.1 μg/m3 (34) | 34.0 | |
| Sept. 11, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 32.0 ppb (25) | N/A | N/A | 8.4 μg/m3 (35) | 35.0 | |
| Sept. 11, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 10.2 μg/m3 (42) | 42.0 | |
| Sept. 11, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 10.6 μg/m3 (44) | 44.0 | |
| Sept. 11, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 25.0 ppb (19) | N/A | N/A | 12.9 μg/m3 (52) | 52.0 | |
| Sept. 11, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 13.5 μg/m3 (53) | 53.0 |