Howard Co MD, US: 39.143197, -76.846192
| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| May 21, 2019, 3 p.m. | 9.7 ppb (9) | 2.7 ppb (3) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | N/A | 9.0 | |
| May 21, 2019, 2 p.m. | 11.2 ppb (10) | 4.0 ppb (4) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 | |
| May 21, 2019, 1 p.m. | 10.6 ppb (10) | 2.7 ppb (3) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | N/A | N/A | N/A | 10.0 | |
| May 21, 2019, noon | 13.2 ppb (12) | 3.6 ppb (3) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | N/A | N/A | N/A | 12.0 | |
| May 21, 2019, 11 a.m. | 17.1 ppb (16) | 5.0 ppb (5) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 2.0 μg/m3 (8) | 16.0 | |
| May 21, 2019, 10 a.m. | 27.2 ppb (25) | 11.8 ppb (11) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 3.0 μg/m3 (12) | 25.0 | |
| May 21, 2019, 9 a.m. | 30.4 ppb (28) | 12.3 ppb (11) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 2.0 μg/m3 (8) | 28.0 | |
| May 21, 2019, 8 a.m. | 21.1 ppb (20) | 6.5 ppb (6) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 1.0 μg/m3 (4) | 20.0 | |
| May 21, 2019, 7 a.m. | 14.5 ppb (13) | 2.7 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 2.0 μg/m3 (8) | 13.0 | |
| May 21, 2019, 6 a.m. | 18.7 ppb (17) | 3.5 ppb (3) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 21, 2019, 5 a.m. | 25.5 ppb (24) | 6.4 ppb (6) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 21, 2019, 4 a.m. | 24.7 ppb (23) | 5.8 ppb (5) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | N/A | N/A | 5.0 μg/m3 (21) | 23.0 | |
| May 21, 2019, 3 a.m. | 19.9 ppb (18) | 3.1 ppb (3) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 21, 2019, 2 a.m. | 21.1 ppb (20) | 3.6 ppb (3) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 21, 2019, 1 a.m. | 26.3 ppb (24) | 6.0 ppb (6) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 5.0 μg/m3 (21) | 24.0 | |
| May 21, 2019, midnight | 24.0 ppb (22) | 5.2 ppb (5) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 3.0 μg/m3 (12) | 22.0 | |
| May 20, 2019, 11 p.m. | 15.9 ppb (15) | 3.2 ppb (3) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 20, 2019, 10 p.m. | 11.5 ppb (11) | 1.9 ppb (2) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 20, 2019, 9 p.m. | 11.1 ppb (10) | 2.1 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 20, 2019, 8 p.m. | 10.3 ppb (10) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 20, 2019, 7 p.m. | 11.5 ppb (11) | 2.5 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 20, 2019, 6 p.m. | 15.5 ppb (14) | 3.9 ppb (4) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 20, 2019, 5 p.m. | 15.0 ppb (14) | 3.7 ppb (3) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | N/A | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 20, 2019, 4 p.m. | 16.0 ppb (15) | 2.9 ppb (3) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 20, 2019, 3 p.m. | 26.2 ppb (24) | 5.9 ppb (5) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 20, 2019, 2 p.m. | 34.1 ppb (32) | 9.6 ppb (9) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | N/A | 32.0 | |
| May 20, 2019, 1 p.m. | 34.2 ppb (32) | 11.5 ppb (11) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 20, 2019, noon | 35.1 ppb (32) | 13.2 ppb (12) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 20, 2019, 11 a.m. | 41.0 ppb (38) | 18.1 ppb (17) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 17.0 μg/m3 (61) | 61.0 | |
| May 20, 2019, 10 a.m. | 43.5 ppb (40) | 16.6 ppb (15) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 20, 2019, 9 a.m. | 43.8 ppb (41) | 15.5 ppb (14) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 20, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 20, 2019, 7 a.m. | 28.9 ppb (27) | 6.6 ppb (6) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 20, 2019, 6 a.m. | 30.9 ppb (29) | 7.4 ppb (7) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 20, 2019, 5 a.m. | 29.3 ppb (27) | 6.3 ppb (6) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 20, 2019, 4 a.m. | 37.6 ppb (35) | 9.7 ppb (9) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 20, 2019, 3 a.m. | 36.3 ppb (34) | 8.9 ppb (8) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 19.0 μg/m3 (65) | 65.0 | |
| May 20, 2019, 2 a.m. | 35.9 ppb (33) | 9.1 ppb (8) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 21.0 μg/m3 (69) | 69.0 | |
| May 20, 2019, 1 a.m. | 30.8 ppb (29) | 7.6 ppb (7) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 18.0 μg/m3 (63) | 63.0 | |
| May 20, 2019, midnight | 24.9 ppb (23) | 5.3 ppb (5) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.35 ppb (4) | N/A | 17.0 μg/m3 (61) | 61.0 | |
| May 19, 2019, 11 p.m. | 22.2 ppb (21) | 5.0 ppb (5) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 20.0 μg/m3 (67) | 67.0 | |
| May 19, 2019, 10 p.m. | 16.1 ppb (15) | 3.2 ppb (3) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 19, 2019, 9 p.m. | 18.2 ppb (17) | 4.2 ppb (4) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 17.0 μg/m3 (61) | 61.0 | |
| May 19, 2019, 8 p.m. | 15.5 ppb (14) | 3.7 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 18.0 μg/m3 (63) | 63.0 | |
| May 19, 2019, 7 p.m. | 14.8 ppb (14) | 3.3 ppb (3) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 16.0 μg/m3 (59) | 59.0 | |
| May 19, 2019, 6 p.m. | 15.4 ppb (14) | 3.3 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 19, 2019, 5 p.m. | 15.5 ppb (14) | 3.2 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 19, 2019, 4 p.m. | 13.6 ppb (13) | 2.7 ppb (3) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 19, 2019, 3 p.m. | 15.7 ppb (15) | 3.4 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 19, 2019, 2 p.m. | 17.3 ppb (16) | 4.6 ppb (4) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 1 p.m. | 16.7 ppb (15) | 4.1 ppb (4) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 19, 2019, noon | 21.6 ppb (20) | 7.6 ppb (7) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 19, 2019, 11 a.m. | 32.0 ppb (30) | 16.5 ppb (15) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.27 ppb (3) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 10 a.m. | 33.0 ppb (31) | 17.2 ppb (16) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 9 a.m. | 24.9 ppb (23) | 8.7 ppb (8) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 19, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 19, 2019, 7 a.m. | 17.7 ppb (16) | 2.8 ppb (3) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 6 a.m. | 19.7 ppb (18) | 3.7 ppb (3) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 19, 2019, 5 a.m. | 21.9 ppb (20) | 4.3 ppb (4) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 19, 2019, 4 a.m. | 26.5 ppb (25) | 5.7 ppb (5) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | N/A | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 19, 2019, 3 a.m. | 25.0 ppb (23) | 5.9 ppb (5) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.53 ppb (6) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 19, 2019, 2 a.m. | 26.1 ppb (24) | 5.9 ppb (5) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.6 ppb (7) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 19, 2019, 1 a.m. | 20.1 ppb (19) | 3.7 ppb (3) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 19, 2019, midnight | 19.0 ppb (18) | 3.1 ppb (3) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.56 ppb (6) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 18, 2019, 11 p.m. | 19.0 ppb (18) | 3.9 ppb (4) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.56 ppb (6) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 18, 2019, 10 p.m. | 18.0 ppb (17) | 3.9 ppb (4) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.53 ppb (6) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 18, 2019, 9 p.m. | 20.0 ppb (19) | 4.2 ppb (4) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.51 ppb (6) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 18, 2019, 8 p.m. | 21.9 ppb (20) | 4.7 ppb (4) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.52 ppb (6) | N/A | 12.0 μg/m3 (50) | 50.0 | |
| May 18, 2019, 7 p.m. | 19.1 ppb (18) | 4.3 ppb (4) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 18, 2019, 6 p.m. | 19.0 ppb (18) | 4.8 ppb (4) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.48 ppb (5) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 18, 2019, 5 p.m. | 16.0 ppb (15) | 3.7 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.46 ppb (5) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 18, 2019, 4 p.m. | 17.3 ppb (16) | 3.9 ppb (4) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 18, 2019, 3 p.m. | 21.7 ppb (20) | 6.5 ppb (6) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 18, 2019, 2 p.m. | 24.0 ppb (22) | 7.9 ppb (7) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 18, 2019, 1 p.m. | 27.4 ppb (25) | 10.5 ppb (10) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 18, 2019, noon | 31.2 ppb (29) | 15.8 ppb (15) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 18, 2019, 11 a.m. | 30.5 ppb (28) | 17.5 ppb (16) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 18, 2019, 10 a.m. | 50.6 ppb (47) | 31.4 ppb (29) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 18, 2019, 9 a.m. | 29.8 ppb (28) | 13.5 ppb (12) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 18, 2019, 8 a.m. | 27.4 ppb (25) | 10.3 ppb (10) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 18, 2019, 7 a.m. | 30.9 ppb (29) | 12.0 ppb (11) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 18, 2019, 6 a.m. | 25.4 ppb (24) | 8.2 ppb (8) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 18, 2019, 5 a.m. | 19.3 ppb (18) | 3.7 ppb (3) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 7.0 μg/m3 (29) | 29.0 | |
| May 18, 2019, 4 a.m. | 18.7 ppb (17) | 3.4 ppb (3) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 18, 2019, 3 a.m. | 19.1 ppb (18) | 3.9 ppb (4) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.0 ppb (0) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 18, 2019, 2 a.m. | 18.3 ppb (17) | 4.0 ppb (4) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.01 ppb (0) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 18, 2019, 1 a.m. | 15.1 ppb (14) | 2.8 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.05 ppb (1) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 18, 2019, midnight | 16.2 ppb (15) | 2.9 ppb (3) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.1 ppb (1) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 17, 2019, 11 p.m. | 11.7 ppb (11) | 1.8 ppb (2) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 17, 2019, 10 p.m. | 8.5 ppb (8) | 1.3 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.56 ppb (6) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 17, 2019, 9 p.m. | 10.1 ppb (9) | 1.0 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 1.34 ppb (15) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 17, 2019, 8 p.m. | 18.4 ppb (17) | 6.7 ppb (6) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 1.94 ppb (22) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 17, 2019, 7 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 17, 2019, 6 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 17, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.17 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 17, 2019, 4 p.m. | 29.7 ppb (28) | 9.3 ppb (9) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 17, 2019, 3 p.m. | 38.1 ppb (35) | 14.9 ppb (14) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 17, 2019, 2 p.m. | 36.6 ppb (34) | 16.4 ppb (15) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 17, 2019, 1 p.m. | 44.2 ppb (41) | 24.2 ppb (22) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 17, 2019, noon | 60.4 ppb (57) | 38.3 ppb (35) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.38 ppb (4) | N/A | 10.0 μg/m3 (42) | 57.0 | |
| May 17, 2019, 11 a.m. | 63.2 ppb (60) | 40.5 ppb (38) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 11.0 μg/m3 (46) | 60.0 | |
| May 17, 2019, 10 a.m. | 76.3 ppb (74) | 55.8 ppb (52) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.34 ppb (4) | N/A | 17.0 μg/m3 (61) | 74.0 | |
| May 17, 2019, 9 a.m. | 68.6 ppb (66) | 47.6 ppb (44) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 12.0 μg/m3 (50) | 66.0 | |
| May 17, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.31 ppb (3) | N/A | 13.0 μg/m3 (52) | 52.0 | |
| May 17, 2019, 7 a.m. | 53.9 ppb (50) | 31.5 ppb (29) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 11.0 μg/m3 (46) | 50.0 | |
| May 17, 2019, 6 a.m. | 59.6 ppb (56) | 31.5 ppb (29) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.32 ppb (4) | N/A | 12.0 μg/m3 (50) | 56.0 | |
| May 17, 2019, 5 a.m. | 70.8 ppb (68) | 37.9 ppb (35) | N/A | 33.0 ppb (31) | N/A | N/A | N/A | 0.36 ppb (4) | N/A | 13.0 μg/m3 (52) | 68.0 | |
| May 17, 2019, 4 a.m. | 62.9 ppb (59) | 28.1 ppb (26) | N/A | 35.0 ppb (32) | N/A | N/A | N/A | N/A | N/A | 13.0 μg/m3 (52) | 59.0 | |
| May 17, 2019, 3 a.m. | 60.1 ppb (56) | 23.6 ppb (22) | N/A | 37.0 ppb (34) | N/A | N/A | N/A | 0.51 ppb (6) | N/A | 15.0 μg/m3 (56) | 56.0 | |
| May 17, 2019, 2 a.m. | 52.1 ppb (48) | 17.0 ppb (16) | N/A | 35.0 ppb (32) | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 14.0 μg/m3 (54) | 54.0 | |
| May 17, 2019, 1 a.m. | 46.4 ppb (43) | 14.5 ppb (13) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.45 ppb (5) | N/A | 10.0 μg/m3 (42) | 43.0 | |
| May 17, 2019, midnight | 34.3 ppb (32) | 11.9 ppb (11) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.33 ppb (4) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 16, 2019, 11 p.m. | 14.0 ppb (13) | 2.2 ppb (2) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 3.0 μg/m3 (12) | 13.0 | |
| May 16, 2019, 10 p.m. | 13.1 ppb (12) | 2.2 ppb (2) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 16, 2019, 9 p.m. | 10.6 ppb (10) | 1.7 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 16, 2019, 8 p.m. | 9.6 ppb (9) | 1.9 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 16, 2019, 7 p.m. | 9.7 ppb (9) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 16, 2019, 6 p.m. | 9.0 ppb (8) | 1.8 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 8.0 μg/m3 (33) | 33.0 | |
| May 16, 2019, 5 p.m. | 11.4 ppb (11) | 1.9 ppb (2) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 11.0 μg/m3 (46) | 46.0 | |
| May 16, 2019, 4 p.m. | 15.5 ppb (14) | 3.6 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 16, 2019, 3 p.m. | 12.4 ppb (11) | 2.0 ppb (2) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.24 ppb (3) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 16, 2019, 2 p.m. | 23.8 ppb (22) | 7.8 ppb (7) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.26 ppb (3) | N/A | 6.0 μg/m3 (25) | 25.0 | |
| May 16, 2019, 1 p.m. | 25.3 ppb (23) | 9.5 ppb (9) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 16, 2019, noon | 30.7 ppb (28) | 12.2 ppb (11) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 16, 2019, 11 a.m. | 27.3 ppb (25) | 8.8 ppb (8) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 16, 2019, 10 a.m. | 34.2 ppb (32) | 15.0 ppb (14) | N/A | 19.0 ppb (18) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 9.0 μg/m3 (38) | 38.0 | |
| May 16, 2019, 9 a.m. | 52.3 ppb (48) | 24.1 ppb (22) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 6.0 μg/m3 (25) | 48.0 | |
| May 16, 2019, 8 a.m. | 50.7 ppb (47) | 22.0 ppb (20) | N/A | 29.0 ppb (27) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 9.0 μg/m3 (38) | 47.0 | |
| May 16, 2019, 7 a.m. | 41.9 ppb (39) | 16.4 ppb (15) | N/A | 26.0 ppb (24) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | 9.0 μg/m3 (38) | 39.0 | |
| May 16, 2019, 6 a.m. | 47.3 ppb (44) | 23.9 ppb (22) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.12 ppb (1) | N/A | 10.0 μg/m3 (42) | 44.0 | |
| May 16, 2019, 5 a.m. | 44.4 ppb (41) | 20.2 ppb (19) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.14 ppb (2) | N/A | 10.0 μg/m3 (42) | 42.0 | |
| May 16, 2019, 4 a.m. | 45.8 ppb (42) | 23.2 ppb (21) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | N/A | N/A | 4.0 μg/m3 (17) | 42.0 | |
| May 16, 2019, 3 a.m. | 34.8 ppb (32) | 17.6 ppb (16) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.06 ppb (1) | N/A | 3.0 μg/m3 (12) | 32.0 | |
| May 16, 2019, 2 a.m. | 45.5 ppb (42) | 21.4 ppb (20) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 4.0 μg/m3 (17) | 42.0 | |
| May 16, 2019, 1 a.m. | 31.2 ppb (29) | 10.5 ppb (10) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 4.0 μg/m3 (17) | 29.0 | |
| May 16, 2019, midnight | 35.4 ppb (33) | 11.6 ppb (11) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 4.0 μg/m3 (17) | 33.0 | |
| May 15, 2019, 11 p.m. | 19.3 ppb (18) | 5.2 ppb (5) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.21 ppb (2) | N/A | 4.0 μg/m3 (17) | 18.0 | |
| May 15, 2019, 10 p.m. | 13.2 ppb (12) | 3.4 ppb (3) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 4.0 μg/m3 (17) | 17.0 | |
| May 15, 2019, 9 p.m. | 9.0 ppb (8) | 1.7 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 15, 2019, 8 p.m. | 12.4 ppb (11) | 2.8 ppb (3) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 5.0 μg/m3 (21) | 21.0 | |
| May 15, 2019, 7 p.m. | 9.9 ppb (9) | 2.2 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 2.0 μg/m3 (8) | 9.0 | |
| May 15, 2019, 6 p.m. | 7.9 ppb (7) | 1.7 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 0.0 μg/m3 (0) | 7.0 | |
| May 15, 2019, 5 p.m. | 8.6 ppb (8) | 1.9 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.16 ppb (2) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| May 15, 2019, 4 p.m. | 10.4 ppb (10) | 2.7 ppb (3) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 2.0 μg/m3 (8) | 10.0 | |
| May 15, 2019, 3 p.m. | 9.4 ppb (9) | 2.1 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 1.0 μg/m3 (4) | 9.0 | |
| May 15, 2019, 2 p.m. | 10.9 ppb (10) | 2.6 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 1.0 μg/m3 (4) | 10.0 | |
| May 15, 2019, 1 p.m. | 12.1 ppb (11) | 2.5 ppb (2) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.19 ppb (2) | N/A | 1.0 μg/m3 (4) | 11.0 | |
| May 15, 2019, noon | 17.7 ppb (16) | 6.3 ppb (6) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.23 ppb (3) | N/A | 2.0 μg/m3 (8) | 16.0 | |
| May 15, 2019, 11 a.m. | 20.5 ppb (19) | 8.3 ppb (8) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.25 ppb (3) | N/A | 4.0 μg/m3 (17) | 19.0 | |
| May 15, 2019, 10 a.m. | 35.1 ppb (32) | 18.3 ppb (17) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 3.0 μg/m3 (12) | 32.0 | |
| May 15, 2019, 9 a.m. | 42.8 ppb (40) | 22.7 ppb (21) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.29 ppb (3) | N/A | 2.0 μg/m3 (8) | 40.0 | |
| May 15, 2019, 8 a.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.28 ppb (3) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| May 15, 2019, 7 a.m. | 23.1 ppb (21) | 8.0 ppb (7) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.18 ppb (2) | N/A | 3.0 μg/m3 (12) | 21.0 | |
| May 15, 2019, 6 a.m. | 18.2 ppb (17) | 6.0 ppb (6) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 3.0 μg/m3 (12) | 17.0 | |
| May 15, 2019, 5 a.m. | 22.5 ppb (21) | 8.3 ppb (8) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 3.0 μg/m3 (12) | 21.0 | |
| May 15, 2019, 4 a.m. | 29.4 ppb (27) | 12.6 ppb (12) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 5.0 μg/m3 (21) | 27.0 | |
| May 15, 2019, 3 a.m. | 27.1 ppb (25) | 10.8 ppb (10) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.08 ppb (1) | N/A | 2.0 μg/m3 (8) | 25.0 | |
| May 15, 2019, 2 a.m. | 17.7 ppb (16) | 5.3 ppb (5) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.07 ppb (1) | N/A | 1.0 μg/m3 (4) | 16.0 | |
| May 15, 2019, 1 a.m. | 13.4 ppb (12) | 3.5 ppb (3) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.09 ppb (1) | N/A | 2.0 μg/m3 (8) | 12.0 | |
| May 15, 2019, midnight | 11.8 ppb (11) | 3.0 ppb (3) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 14, 2019, 11 p.m. | 10.0 ppb (9) | 2.7 ppb (3) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.22 ppb (2) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 14, 2019, 10 p.m. | 8.4 ppb (8) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 3.0 μg/m3 (12) | 12.0 | |
| May 14, 2019, 9 p.m. | 7.9 ppb (7) | 1.9 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | 2.0 μg/m3 (8) | 8.0 | |
| May 14, 2019, 8 p.m. | 6.8 ppb (6) | 1.5 ppb (1) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.15 ppb (2) | N/A | 1.0 μg/m3 (4) | 6.0 | |
| May 14, 2019, 7 p.m. | 6.5 ppb (6) | 1.7 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | -1.0 μg/m3 (0) | 6.0 | |
| May 14, 2019, 6 p.m. | 6.4 ppb (6) | 1.9 ppb (2) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.13 ppb (1) | N/A | -2.0 μg/m3 (0) | 6.0 | |
| May 14, 2019, 5 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.21 ppb (2) | N/A | -2.0 μg/m3 (0) | 2.0 | |
| May 14, 2019, 4 p.m. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 0.2 ppb (2) | N/A | -4.0 μg/m3 (0) | 2.0 |