Cambridge (Horns Point Rd) MD, US: 38.5876, -76.1408
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. 26, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 27.0 ppb (21) | N/A | N/A | 0.0 μg/m3 (0) | 21.0 | |
| Jan. 26, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 30.0 ppb (23) | N/A | N/A | 0.0 μg/m3 (0) | 23.0 | |
| Jan. 26, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | N/A | N/A | 0.0 μg/m3 (0) | 25.0 | |
| Jan. 26, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | N/A | N/A | 2.0 μg/m3 (8) | 25.0 | |
| Jan. 26, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | N/A | N/A | 2.0 μg/m3 (8) | 25.0 | |
| Jan. 26, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | N/A | N/A | 1.0 μg/m3 (4) | 25.0 | |
| Jan. 26, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | N/A | N/A | 2.0 μg/m3 (8) | 25.0 | |
| Jan. 26, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 28.0 ppb (22) | N/A | N/A | 0.0 μg/m3 (0) | 22.0 | |
| Jan. 26, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 24.0 ppb (18) | N/A | N/A | -2.0 μg/m3 (0) | 18.0 | |
| Jan. 26, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 22.0 ppb (17) | N/A | N/A | 1.0 μg/m3 (4) | 17.0 | |
| Jan. 26, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 12.0 ppb (9) | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 26, 2020, noon | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 10.0 ppb (8) | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 26, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 9.0 ppb (7) | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| Jan. 26, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 9.0 ppb (7) | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| Jan. 26, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 11.0 ppb (8) | N/A | N/A | 4.0 μg/m3 (17) | 17.0 | |
| Jan. 26, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 13.0 ppb (10) | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| Jan. 26, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 20.0 ppb (15) | N/A | N/A | 2.0 μg/m3 (8) | 15.0 | |
| Jan. 26, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 22.0 ppb (17) | N/A | N/A | 3.0 μg/m3 (12) | 17.0 | |
| Jan. 26, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 22.0 ppb (17) | N/A | N/A | 3.0 μg/m3 (12) | 17.0 | |
| Jan. 26, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 22.0 ppb (17) | N/A | N/A | 3.0 μg/m3 (12) | 17.0 | |
| Jan. 26, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 13.0 ppb (10) | N/A | N/A | 0.0 μg/m3 (0) | 10.0 | |
| Jan. 26, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 13.0 ppb (10) | N/A | N/A | 1.0 μg/m3 (4) | 10.0 | |
| Jan. 26, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 16.0 ppb (12) | N/A | N/A | 3.0 μg/m3 (12) | 12.0 | |
| Jan. 26, 2020, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 20.0 ppb (15) | N/A | N/A | 2.0 μg/m3 (8) | 15.0 | |
| Jan. 25, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 26.0 ppb (20) | N/A | N/A | 2.0 μg/m3 (8) | 20.0 | |
| Jan. 25, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 29.0 ppb (22) | N/A | N/A | 1.0 μg/m3 (4) | 22.0 | |
| Jan. 25, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 31.0 ppb (24) | N/A | N/A | 2.0 μg/m3 (8) | 24.0 | |
| Jan. 25, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 28.0 ppb (22) | N/A | N/A | 2.0 μg/m3 (8) | 22.0 | |
| Jan. 25, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 29.0 ppb (22) | N/A | N/A | 1.0 μg/m3 (4) | 22.0 | |
| Jan. 25, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | N/A | N/A | 1.0 μg/m3 (4) | 25.0 | |
| Jan. 25, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 33.0 ppb (25) | N/A | N/A | -2.0 μg/m3 (0) | 25.0 | |
| Jan. 25, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 33.0 ppb (25) | N/A | N/A | -2.0 μg/m3 (0) | 25.0 | |
| Jan. 25, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | N/A | N/A | -1.0 μg/m3 (0) | 25.0 | |
| Jan. 25, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 30.0 ppb (23) | N/A | N/A | 0.0 μg/m3 (0) | 23.0 | |
| Jan. 25, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 33.0 ppb (25) | N/A | N/A | 1.0 μg/m3 (4) | 25.0 | |
| Jan. 25, 2020, noon | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | N/A | N/A | -1.0 μg/m3 (0) | 29.0 | |
| Jan. 25, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | N/A | N/A | -2.0 μg/m3 (0) | 29.0 | |
| Jan. 25, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 36.0 ppb (28) | N/A | N/A | 0.0 μg/m3 (0) | 28.0 | |
| Jan. 25, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 36.0 ppb (28) | N/A | N/A | 1.0 μg/m3 (4) | 28.0 | |
| Jan. 25, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 36.0 ppb (28) | N/A | N/A | 1.0 μg/m3 (4) | 28.0 | |
| Jan. 25, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | N/A | N/A | 2.0 μg/m3 (8) | 29.0 | |
| Jan. 25, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | N/A | N/A | 3.0 μg/m3 (12) | 29.0 | |
| Jan. 25, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 39.0 ppb (30) | N/A | N/A | 2.0 μg/m3 (8) | 30.0 | |
| Jan. 25, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | N/A | N/A | 0.0 μg/m3 (0) | 29.0 | |
| Jan. 25, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | N/A | N/A | 2.0 μg/m3 (8) | 29.0 | |
| Jan. 25, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | N/A | N/A | 2.0 μg/m3 (8) | 28.0 | |
| Jan. 25, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | N/A | N/A | 2.0 μg/m3 (8) | 28.0 | |
| Jan. 25, 2020, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | N/A | N/A | 4.0 μg/m3 (17) | 28.0 | |
| Jan. 24, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | N/A | N/A | 5.0 μg/m3 (21) | 29.0 | |
| Jan. 24, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | N/A | N/A | 4.0 μg/m3 (17) | 29.0 | |
| Jan. 24, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | N/A | N/A | 3.0 μg/m3 (12) | 31.0 | |
| Jan. 24, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | N/A | N/A | 3.0 μg/m3 (12) | 31.0 | |
| Jan. 24, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | N/A | N/A | 3.0 μg/m3 (12) | 31.0 | |
| Jan. 24, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | N/A | N/A | 1.0 μg/m3 (4) | 31.0 | |
| Jan. 24, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | N/A | N/A | 2.0 μg/m3 (8) | 28.0 | |
| Jan. 24, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 30.0 ppb (23) | N/A | N/A | 4.0 μg/m3 (17) | 23.0 | |
| Jan. 24, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 27.0 ppb (21) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 24, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 25.0 ppb (19) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 24, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 24.0 ppb (18) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 24, 2020, noon | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 23.0 ppb (18) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 24, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 24.0 ppb (18) | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 24, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 24.0 ppb (18) | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Jan. 24, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 22.0 ppb (17) | N/A | N/A | 14.0 μg/m3 (54) | 54.0 | |
| Jan. 24, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 20.0 ppb (15) | N/A | N/A | 14.0 μg/m3 (54) | 54.0 | |
| Jan. 24, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 19.0 ppb (15) | N/A | N/A | 15.0 μg/m3 (56) | 56.0 | |
| Jan. 24, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 18.0 ppb (14) | N/A | N/A | 14.0 μg/m3 (54) | 54.0 | |
| Jan. 24, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 19.0 ppb (15) | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 24, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 16.0 ppb (12) | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 24, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 18.0 ppb (14) | N/A | N/A | 15.0 μg/m3 (56) | 56.0 | |
| Jan. 24, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 20.0 ppb (15) | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Jan. 24, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 20.0 ppb (15) | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 24, 2020, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 22.0 ppb (17) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 23, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 24.0 ppb (18) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 23, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 27.0 ppb (21) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 23, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 31.0 ppb (24) | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 23, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 33.0 ppb (25) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 23, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 33.0 ppb (25) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 23, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 33.0 ppb (25) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 23, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 33.0 ppb (25) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 23, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 23, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 29.0 ppb (22) | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 23, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 25.0 ppb (19) | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 23, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 8.0 ppb (6) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 23, 2020, noon | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 11.0 ppb (8) | N/A | N/A | 12.0 μg/m3 (50) | 50.0 | |
| Jan. 23, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 15.0 ppb (12) | N/A | N/A | 11.0 μg/m3 (46) | 46.0 | |
| Jan. 23, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 18.0 ppb (14) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 23, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 22.0 ppb (17) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 23, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 26.0 ppb (20) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 23, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 23.0 ppb (18) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 23, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 24.0 ppb (18) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 23, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 22.0 ppb (17) | N/A | N/A | 3.0 μg/m3 (12) | 17.0 | |
| Jan. 23, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 20.0 ppb (15) | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 23, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 24.0 ppb (18) | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 23, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 24.0 ppb (18) | N/A | N/A | 4.0 μg/m3 (17) | 18.0 | |
| Jan. 23, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 25.0 ppb (19) | N/A | N/A | 3.0 μg/m3 (12) | 19.0 | |
| Jan. 23, 2020, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 30.0 ppb (23) | N/A | N/A | 2.0 μg/m3 (8) | 23.0 | |
| Jan. 22, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 30.0 ppb (23) | N/A | N/A | 0.0 μg/m3 (0) | 23.0 | |
| Jan. 22, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | N/A | N/A | 2.0 μg/m3 (8) | 28.0 | |
| Jan. 22, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | N/A | N/A | 4.0 μg/m3 (17) | 31.0 | |
| Jan. 22, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 39.0 ppb (30) | N/A | N/A | 5.0 μg/m3 (21) | 30.0 | |
| Jan. 22, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 37.0 ppb (28) | N/A | N/A | 6.0 μg/m3 (25) | 28.0 | |
| Jan. 22, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 39.0 ppb (30) | N/A | N/A | 7.0 μg/m3 (29) | 30.0 | |
| Jan. 22, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 40.0 ppb (31) | N/A | N/A | N/A | 31.0 | |
| Jan. 22, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 38.0 ppb (29) | N/A | N/A | N/A | 29.0 | |
| Jan. 22, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 37.0 ppb (28) | N/A | N/A | 4.0 μg/m3 (17) | 28.0 | |
| Jan. 22, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 1.0 ppb (1) | 35.0 ppb (27) | N/A | N/A | 6.0 μg/m3 (25) | 27.0 | |
| Jan. 22, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 33.0 ppb (25) | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| Jan. 22, 2020, noon | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 22, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 28.0 ppb (22) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 22, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 22, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 29.0 ppb (22) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 22, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 31.0 ppb (24) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 22, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 22, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 33.0 ppb (25) | N/A | N/A | 5.0 μg/m3 (21) | 25.0 | |
| Jan. 22, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 4.0 μg/m3 (17) | 28.0 | |
| Jan. 22, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 22, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 22, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 6.0 μg/m3 (25) | 29.0 | |
| Jan. 22, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 6.0 μg/m3 (25) | 28.0 | |
| Jan. 22, 2020, midnight | N/A | N/A | N/A | N/A | N/A | N/A | 35.0 ppb (27) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 21, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 21, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 36.0 ppb (28) | N/A | N/A | 4.0 μg/m3 (17) | 28.0 | |
| Jan. 21, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 37.0 ppb (28) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 21, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 8.0 μg/m3 (33) | 33.0 | |
| Jan. 21, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | 2.0 μg/m3 (8) | 31.0 | |
| Jan. 21, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | 3.0 μg/m3 (12) | 31.0 | |
| Jan. 21, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 39.0 ppb (30) | N/A | N/A | 2.0 μg/m3 (8) | 30.0 | |
| Jan. 21, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | 3.0 μg/m3 (12) | 31.0 | |
| Jan. 21, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | 2.0 μg/m3 (8) | 31.0 | |
| Jan. 21, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | 2.0 μg/m3 (8) | 31.0 | |
| Jan. 21, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | 40.0 ppb (31) | N/A | N/A | 1.0 μg/m3 (4) | 31.0 | |
| Jan. 21, 2020, noon | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | N/A | N/A | 3.0 μg/m3 (12) | 29.0 | |
| Jan. 21, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 38.0 ppb (29) | N/A | N/A | 5.0 μg/m3 (21) | 29.0 | |
| Jan. 21, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 36.0 ppb (28) | N/A | N/A | 5.0 μg/m3 (21) | 28.0 | |
| Jan. 21, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 37.0 ppb (28) | N/A | N/A | 5.0 μg/m3 (21) | 28.0 | |
| Jan. 21, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 38.0 ppb (29) | N/A | N/A | 4.0 μg/m3 (17) | 29.0 | |
| Jan. 21, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | N/A | N/A | 4.0 μg/m3 (17) | 31.0 | |
| Jan. 21, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | N/A | N/A | -1.0 μg/m3 (0) | 31.0 | |
| Jan. 21, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 41.0 ppb (32) | N/A | N/A | 1.0 μg/m3 (4) | 32.0 | |
| Jan. 21, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | N/A | N/A | 2.0 μg/m3 (8) | 31.0 | |
| Jan. 21, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 39.0 ppb (30) | N/A | N/A | 3.0 μg/m3 (12) | 30.0 | |
| Jan. 21, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | N/A | N/A | 5.0 μg/m3 (21) | 31.0 | |
| Jan. 21, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 40.0 ppb (31) | N/A | N/A | 6.0 μg/m3 (25) | 31.0 | |
| Jan. 21, 2020, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 41.0 ppb (32) | N/A | N/A | 2.0 μg/m3 (8) | 32.0 | |
| Jan. 20, 2020, 11 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | N/A | N/A | 4.0 μg/m3 (17) | 32.0 | |
| Jan. 20, 2020, 10 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | N/A | N/A | 6.0 μg/m3 (25) | 32.0 | |
| Jan. 20, 2020, 9 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 42.0 ppb (32) | N/A | N/A | 6.0 μg/m3 (25) | 32.0 | |
| Jan. 20, 2020, 8 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 43.0 ppb (33) | N/A | N/A | 3.0 μg/m3 (12) | 33.0 | |
| Jan. 20, 2020, 7 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 43.0 ppb (33) | N/A | N/A | 1.0 μg/m3 (4) | 33.0 | |
| Jan. 20, 2020, 6 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 43.0 ppb (33) | N/A | N/A | 1.0 μg/m3 (4) | 33.0 | |
| Jan. 20, 2020, 5 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 41.0 ppb (32) | N/A | N/A | 2.0 μg/m3 (8) | 32.0 | |
| Jan. 20, 2020, 4 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 39.0 ppb (30) | N/A | N/A | 4.0 μg/m3 (17) | 30.0 | |
| Jan. 20, 2020, 3 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 36.0 ppb (28) | N/A | N/A | 6.0 μg/m3 (25) | 28.0 | |
| Jan. 20, 2020, 2 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 34.0 ppb (26) | N/A | N/A | 4.0 μg/m3 (17) | 26.0 | |
| Jan. 20, 2020, 1 p.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 33.0 ppb (25) | N/A | N/A | 5.0 μg/m3 (21) | 25.0 | |
| Jan. 20, 2020, noon | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 20, 2020, 11 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 32.0 ppb (25) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 20, 2020, 10 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 31.0 ppb (24) | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 20, 2020, 9 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | 30.0 ppb (23) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 20, 2020, 8 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 28.0 ppb (22) | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| Jan. 20, 2020, 7 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 26.0 ppb (20) | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 20, 2020, 6 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 26.0 ppb (20) | N/A | N/A | 6.0 μg/m3 (25) | 25.0 | |
| Jan. 20, 2020, 5 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 25.0 ppb (19) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 20, 2020, 4 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 25.0 ppb (19) | N/A | N/A | 7.0 μg/m3 (29) | 29.0 | |
| Jan. 20, 2020, 3 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 25.0 ppb (19) | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 20, 2020, 2 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 26.0 ppb (20) | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 20, 2020, 1 a.m. | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 27.0 ppb (21) | N/A | N/A | 5.0 μg/m3 (21) | 21.0 | |
| Jan. 20, 2020, midnight | N/A | N/A | N/A | N/A | N/A | 0.0 ppb (0) | 28.0 ppb (22) | N/A | N/A | 4.0 μg/m3 (17) | 22.0 |