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| Date Observed (UTC) | NOX | NO | NOY | NO2 | NO2Y | SO2 | OZONE | CO | PM10 | PM2.5 | AQI | AQI/500 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 26, 2019, 8 a.m. | 123.0 ppb (104) | 53.0 ppb (49) | N/A | 70.0 ppb (67) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | N/A | 104.0 | |
| March 26, 2019, 7 a.m. | 93.0 ppb (91) | 43.0 ppb (40) | N/A | 50.0 ppb (46) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 91.0 | |
| March 26, 2019, 6 a.m. | 38.0 ppb (35) | 11.0 ppb (10) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 35.0 | |
| March 26, 2019, 5 a.m. | 53.0 ppb (49) | 19.0 ppb (18) | N/A | 34.0 ppb (31) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 49.0 | |
| March 26, 2019, 4 a.m. | 116.0 ppb (103) | 57.0 ppb (53) | N/A | 59.0 ppb (55) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | N/A | 103.0 | |
| March 26, 2019, 3 a.m. | 149.0 ppb (109) | 86.0 ppb (84) | N/A | 63.0 ppb (60) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 109.0 | |
| March 26, 2019, 2 a.m. | 166.0 ppb (112) | 105.0 ppb (101) | N/A | 61.0 ppb (57) | N/A | N/A | N/A | 0.6 ppb (7) | N/A | N/A | 112.0 | |
| March 26, 2019, 1 a.m. | 92.0 ppb (90) | 49.0 ppb (45) | N/A | 43.0 ppb (40) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | N/A | 90.0 | |
| March 26, 2019, midnight | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | |
| March 25, 2019, 11 p.m. | 36.0 ppb (33) | 6.0 ppb (6) | N/A | 30.0 ppb (28) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 33.0 | |
| March 25, 2019, 6 p.m. | 21.0 ppb (19) | 1.0 ppb (1) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 19.0 | |
| March 25, 2019, 5 p.m. | 19.0 ppb (18) | 1.0 ppb (1) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 18.0 | |
| March 25, 2019, 3 p.m. | 23.0 ppb (21) | 2.0 ppb (2) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 21.0 | |
| March 25, 2019, 2 p.m. | 23.0 ppb (21) | 1.0 ppb (1) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 21.0 | |
| March 25, 2019, 1 p.m. | 35.0 ppb (32) | 4.0 ppb (4) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 32.0 | |
| March 25, 2019, noon | 58.0 ppb (54) | 6.0 ppb (6) | N/A | 52.0 ppb (48) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | N/A | 54.0 | |
| March 25, 2019, 11 a.m. | 94.0 ppb (93) | 31.0 ppb (29) | N/A | 63.0 ppb (60) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | N/A | 93.0 | |
| March 25, 2019, 10 a.m. | 93.0 ppb (91) | 30.0 ppb (28) | N/A | 63.0 ppb (60) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 91.0 | |
| March 25, 2019, 9 a.m. | 89.0 ppb (87) | 30.0 ppb (28) | N/A | 59.0 ppb (55) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 87.0 | |
| March 25, 2019, 8 a.m. | 62.0 ppb (59) | 15.0 ppb (14) | N/A | 47.0 ppb (44) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 59.0 | |
| March 25, 2019, 7 a.m. | 76.0 ppb (73) | 25.0 ppb (23) | N/A | 51.0 ppb (47) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 73.0 | |
| March 25, 2019, 6 a.m. | 87.0 ppb (85) | 34.0 ppb (31) | N/A | 53.0 ppb (49) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | N/A | 85.0 | |
| March 25, 2019, 5 a.m. | 94.0 ppb (93) | 40.0 ppb (37) | N/A | 54.0 ppb (50) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 93.0 | |
| March 25, 2019, 4 a.m. | 77.0 ppb (74) | 31.0 ppb (29) | N/A | 46.0 ppb (43) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 74.0 | |
| March 25, 2019, 3 a.m. | 99.0 ppb (98) | 48.0 ppb (44) | N/A | 51.0 ppb (47) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 98.0 | |
| March 25, 2019, 2 a.m. | 115.0 ppb (103) | 62.0 ppb (59) | N/A | N/A | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 103.0 | |
| March 25, 2019, 1 a.m. | 31.0 ppb (29) | 13.0 ppb (12) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 29.0 | |
| March 25, 2019, midnight | 22.0 ppb (20) | 7.0 ppb (6) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 20.0 | |
| March 24, 2019, 11 p.m. | 24.0 ppb (22) | 7.0 ppb (6) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 22.0 | |
| March 24, 2019, 10 p.m. | 29.0 ppb (27) | 7.0 ppb (6) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 27.0 | |
| March 24, 2019, 9 p.m. | 29.0 ppb (27) | 5.0 ppb (5) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 27.0 | |
| March 24, 2019, 8 p.m. | 23.0 ppb (21) | 2.0 ppb (2) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 21.0 | |
| March 24, 2019, 7 p.m. | 16.0 ppb (15) | 1.0 ppb (1) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 15.0 | |
| March 24, 2019, 6 p.m. | 13.0 ppb (12) | 1.0 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 12.0 | |
| March 24, 2019, 3 p.m. | 6.0 ppb (6) | 0.0 ppb (0) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 6.0 | |
| March 24, 2019, 2 p.m. | 10.0 ppb (9) | 1.0 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 9.0 | |
| March 24, 2019, 1 p.m. | 10.0 ppb (9) | 1.0 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 9.0 | |
| March 24, 2019, noon | 10.0 ppb (9) | 1.0 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 9.0 | |
| March 24, 2019, 11 a.m. | 14.0 ppb (13) | 1.0 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 13.0 | |
| March 24, 2019, 10 a.m. | 14.0 ppb (13) | 1.0 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 13.0 | |
| March 24, 2019, 9 a.m. | 8.0 ppb (7) | 0.0 ppb (0) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 7.0 | |
| March 24, 2019, 8 a.m. | 17.0 ppb (16) | 2.0 ppb (2) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 16.0 | |
| March 24, 2019, 7 a.m. | 23.0 ppb (21) | 3.0 ppb (3) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 21.0 | |
| March 24, 2019, 6 a.m. | 22.0 ppb (20) | 4.0 ppb (4) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 20.0 | |
| March 24, 2019, 5 a.m. | 19.0 ppb (18) | 4.0 ppb (4) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 18.0 | |
| March 24, 2019, 4 a.m. | 17.0 ppb (16) | 4.0 ppb (4) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 16.0 | |
| March 24, 2019, 3 a.m. | 10.0 ppb (9) | 2.0 ppb (2) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 9.0 | |
| March 24, 2019, 2 a.m. | 5.0 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 5.0 | |
| March 24, 2019, 1 a.m. | 5.0 ppb (5) | 1.0 ppb (1) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 5.0 | |
| March 24, 2019, midnight | 8.0 ppb (7) | 2.0 ppb (2) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 7.0 | |
| March 23, 2019, 11 p.m. | 14.0 ppb (13) | 3.0 ppb (3) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 13.0 | |
| March 23, 2019, 10 p.m. | 14.0 ppb (13) | 3.0 ppb (3) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 13.0 | |
| March 23, 2019, 9 p.m. | 17.0 ppb (16) | 2.0 ppb (2) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 16.0 | |
| March 23, 2019, 8 p.m. | 33.0 ppb (31) | 3.0 ppb (3) | N/A | 30.0 ppb (28) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 31.0 | |
| March 23, 2019, 7 p.m. | 22.0 ppb (20) | 2.0 ppb (2) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 20.0 | |
| March 23, 2019, 6 p.m. | 19.0 ppb (18) | 2.0 ppb (2) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 18.0 | |
| March 23, 2019, 5 p.m. | 15.0 ppb (14) | 1.0 ppb (1) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 14.0 | |
| March 23, 2019, 4 p.m. | 18.0 ppb (17) | 2.0 ppb (2) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 17.0 | |
| March 23, 2019, 3 p.m. | 17.0 ppb (16) | 1.0 ppb (1) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 16.0 | |
| March 23, 2019, 2 p.m. | 14.0 ppb (13) | 1.0 ppb (1) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 13.0 | |
| March 23, 2019, 1 p.m. | 17.0 ppb (16) | 1.0 ppb (1) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 16.0 | |
| March 23, 2019, noon | 27.0 ppb (25) | 4.0 ppb (4) | N/A | 23.0 ppb (21) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 25.0 | |
| March 23, 2019, 11 a.m. | 20.0 ppb (19) | 3.0 ppb (3) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 19.0 | |
| March 23, 2019, 10 a.m. | 19.0 ppb (18) | 2.0 ppb (2) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 18.0 | |
| March 23, 2019, 9 a.m. | 20.0 ppb (19) | 2.0 ppb (2) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 19.0 | |
| March 23, 2019, 8 a.m. | 36.0 ppb (33) | 11.0 ppb (10) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 33.0 | |
| March 23, 2019, 7 a.m. | 22.0 ppb (20) | 4.0 ppb (4) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 20.0 | |
| March 23, 2019, 6 a.m. | 33.0 ppb (31) | 11.0 ppb (10) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 31.0 | |
| March 23, 2019, 5 a.m. | 17.0 ppb (16) | 4.0 ppb (4) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 16.0 | |
| March 23, 2019, 4 a.m. | 20.0 ppb (19) | 6.0 ppb (6) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 19.0 | |
| March 23, 2019, 3 a.m. | 31.0 ppb (29) | 9.0 ppb (8) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 29.0 | |
| March 23, 2019, 2 a.m. | 32.0 ppb (30) | 10.0 ppb (9) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 30.0 | |
| March 23, 2019, 1 a.m. | 18.0 ppb (17) | 5.0 ppb (5) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 17.0 | |
| March 23, 2019, midnight | 15.0 ppb (14) | 3.0 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 14.0 | |
| March 22, 2019, 11 p.m. | 9.0 ppb (8) | 2.0 ppb (2) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 8.0 | |
| March 22, 2019, 10 p.m. | 12.0 ppb (11) | 2.0 ppb (2) | N/A | 10.0 ppb (9) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 11.0 | |
| March 22, 2019, 9 p.m. | 14.0 ppb (13) | 3.0 ppb (3) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 13.0 | |
| March 22, 2019, 8 p.m. | 10.0 ppb (9) | 1.0 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 9.0 | |
| March 22, 2019, 7 p.m. | 7.0 ppb (6) | 1.0 ppb (1) | N/A | 6.0 ppb (6) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 6.0 | |
| March 22, 2019, 6 p.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 4.0 | |
| March 22, 2019, 5 p.m. | 4.0 ppb (4) | 0.0 ppb (0) | N/A | 4.0 ppb (4) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 4.0 | |
| March 22, 2019, 4 p.m. | 5.0 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 5.0 | |
| March 22, 2019, 3 p.m. | 5.0 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 5.0 | |
| March 22, 2019, 2 p.m. | 5.0 ppb (5) | 0.0 ppb (0) | N/A | 5.0 ppb (5) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 5.0 | |
| March 22, 2019, 1 p.m. | 8.0 ppb (7) | 1.0 ppb (1) | N/A | 7.0 ppb (6) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 7.0 | |
| March 22, 2019, noon | 9.0 ppb (8) | 1.0 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 8.0 | |
| March 22, 2019, 11 a.m. | 13.0 ppb (12) | 1.0 ppb (1) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 12.0 | |
| March 22, 2019, 10 a.m. | 55.0 ppb (51) | 15.0 ppb (14) | N/A | 40.0 ppb (37) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 51.0 | |
| March 22, 2019, 9 a.m. | 36.0 ppb (33) | 8.0 ppb (7) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 33.0 | |
| March 22, 2019, 8 a.m. | 80.0 ppb (78) | 25.0 ppb (23) | N/A | 55.0 ppb (51) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | N/A | 78.0 | |
| March 22, 2019, 7 a.m. | 52.0 ppb (48) | 20.0 ppb (19) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 48.0 | |
| March 22, 2019, 5 a.m. | 14.0 ppb (13) | 2.0 ppb (2) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 13.0 | |
| March 22, 2019, 4 a.m. | 10.0 ppb (9) | 1.0 ppb (1) | N/A | 9.0 ppb (8) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 9.0 | |
| March 22, 2019, 3 a.m. | 9.0 ppb (8) | 1.0 ppb (1) | N/A | 8.0 ppb (7) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 8.0 | |
| March 22, 2019, 2 a.m. | 16.0 ppb (15) | 5.0 ppb (5) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 15.0 | |
| March 22, 2019, 1 a.m. | 17.0 ppb (16) | 5.0 ppb (5) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 16.0 | |
| March 22, 2019, midnight | 15.0 ppb (14) | 4.0 ppb (4) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 14.0 | |
| March 21, 2019, 11 p.m. | 21.0 ppb (19) | 6.0 ppb (6) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 19.0 | |
| March 21, 2019, 10 p.m. | 32.0 ppb (30) | 12.0 ppb (11) | N/A | 20.0 ppb (19) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 30.0 | |
| March 21, 2019, 9 p.m. | 38.0 ppb (35) | 10.0 ppb (9) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 35.0 | |
| March 21, 2019, 8 p.m. | 41.0 ppb (38) | 9.0 ppb (8) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.6 ppb (7) | N/A | N/A | 38.0 | |
| March 21, 2019, 7 p.m. | 136.0 ppb (107) | 82.0 ppb (80) | N/A | 54.0 ppb (50) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | N/A | 107.0 | |
| March 21, 2019, 6 p.m. | 82.0 ppb (80) | 37.0 ppb (34) | N/A | 45.0 ppb (42) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 80.0 | |
| March 21, 2019, 5 p.m. | 48.0 ppb (44) | 15.0 ppb (14) | N/A | 33.0 ppb (31) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 44.0 | |
| March 21, 2019, 4 p.m. | 23.0 ppb (21) | 5.0 ppb (5) | N/A | 18.0 ppb (17) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 21.0 | |
| March 21, 2019, 3 p.m. | 19.0 ppb (18) | 4.0 ppb (4) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 18.0 | |
| March 21, 2019, 2 p.m. | 17.0 ppb (16) | 3.0 ppb (3) | N/A | 14.0 ppb (13) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 16.0 | |
| March 21, 2019, 1 p.m. | 20.0 ppb (19) | 5.0 ppb (5) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 19.0 | |
| March 21, 2019, noon | 20.0 ppb (19) | 4.0 ppb (4) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 19.0 | |
| March 21, 2019, 11 a.m. | 19.0 ppb (18) | 4.0 ppb (4) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 18.0 | |
| March 21, 2019, 10 a.m. | 15.0 ppb (14) | 3.0 ppb (3) | N/A | 12.0 ppb (11) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 14.0 | |
| March 21, 2019, 9 a.m. | 16.0 ppb (15) | 3.0 ppb (3) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 15.0 | |
| March 21, 2019, 8 a.m. | 16.0 ppb (15) | 3.0 ppb (3) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 15.0 | |
| March 21, 2019, 7 a.m. | 15.0 ppb (14) | 4.0 ppb (4) | N/A | 11.0 ppb (10) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 14.0 | |
| March 21, 2019, 6 a.m. | 21.0 ppb (19) | 6.0 ppb (6) | N/A | 15.0 ppb (14) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 19.0 | |
| March 21, 2019, 5 a.m. | 24.0 ppb (22) | 7.0 ppb (6) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 22.0 | |
| March 21, 2019, 4 a.m. | 19.0 ppb (18) | 6.0 ppb (6) | N/A | 13.0 ppb (12) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 18.0 | |
| March 21, 2019, 2 a.m. | 34.0 ppb (31) | 10.0 ppb (9) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 31.0 | |
| March 21, 2019, 1 a.m. | 47.0 ppb (44) | 15.0 ppb (14) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 44.0 | |
| March 21, 2019, midnight | 47.0 ppb (44) | 15.0 ppb (14) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 44.0 | |
| March 20, 2019, 11 p.m. | 55.0 ppb (51) | 18.0 ppb (17) | N/A | 37.0 ppb (34) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 51.0 | |
| March 20, 2019, 9 p.m. | 50.0 ppb (46) | 13.0 ppb (12) | N/A | 37.0 ppb (34) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 46.0 | |
| March 20, 2019, 8 p.m. | 48.0 ppb (44) | 12.0 ppb (11) | N/A | 36.0 ppb (33) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 44.0 | |
| March 20, 2019, 7 p.m. | 42.0 ppb (39) | 9.0 ppb (8) | N/A | 33.0 ppb (31) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 39.0 | |
| March 20, 2019, 6 p.m. | 46.0 ppb (43) | 9.0 ppb (8) | N/A | 37.0 ppb (34) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 43.0 | |
| March 20, 2019, 5 p.m. | 36.0 ppb (33) | 5.0 ppb (5) | N/A | 31.0 ppb (29) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 33.0 | |
| March 20, 2019, 4 p.m. | 42.0 ppb (39) | 6.0 ppb (6) | N/A | 36.0 ppb (33) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 39.0 | |
| March 20, 2019, 3 p.m. | 41.0 ppb (38) | 5.0 ppb (5) | N/A | 36.0 ppb (33) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 38.0 | |
| March 20, 2019, 2 p.m. | 59.0 ppb (55) | 11.0 ppb (10) | N/A | 48.0 ppb (44) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 55.0 | |
| March 20, 2019, 1 p.m. | 65.0 ppb (62) | 12.0 ppb (11) | N/A | 53.0 ppb (49) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 62.0 | |
| March 20, 2019, noon | 71.0 ppb (68) | 15.0 ppb (14) | N/A | 56.0 ppb (52) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 68.0 | |
| March 20, 2019, 11 a.m. | 77.0 ppb (74) | 19.0 ppb (18) | N/A | 58.0 ppb (54) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 74.0 | |
| March 20, 2019, 10 a.m. | 96.0 ppb (95) | 31.0 ppb (29) | N/A | 65.0 ppb (62) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | N/A | 95.0 | |
| March 20, 2019, 9 a.m. | 108.0 ppb (101) | 31.0 ppb (29) | N/A | 77.0 ppb (74) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 101.0 | |
| March 20, 2019, 8 a.m. | 126.0 ppb (105) | 36.0 ppb (33) | N/A | 90.0 ppb (88) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 105.0 | |
| March 20, 2019, 7 a.m. | 90.0 ppb (88) | 20.0 ppb (19) | N/A | 70.0 ppb (67) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 88.0 | |
| March 20, 2019, 6 a.m. | 93.0 ppb (91) | 27.0 ppb (25) | N/A | 66.0 ppb (63) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 91.0 | |
| March 20, 2019, 5 a.m. | 86.0 ppb (84) | 29.0 ppb (27) | N/A | 57.0 ppb (53) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 84.0 | |
| March 20, 2019, 4 a.m. | 88.0 ppb (86) | 31.0 ppb (29) | N/A | 57.0 ppb (53) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 86.0 | |
| March 20, 2019, 3 a.m. | 62.0 ppb (59) | 23.0 ppb (21) | N/A | 39.0 ppb (36) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 59.0 | |
| March 20, 2019, 2 a.m. | 24.0 ppb (22) | 7.0 ppb (6) | N/A | 17.0 ppb (16) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 22.0 | |
| March 20, 2019, 1 a.m. | 22.0 ppb (20) | 6.0 ppb (6) | N/A | 16.0 ppb (15) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 20.0 | |
| March 20, 2019, midnight | 31.0 ppb (29) | 9.0 ppb (8) | N/A | 22.0 ppb (20) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 29.0 | |
| March 19, 2019, 11 p.m. | 31.0 ppb (29) | 7.0 ppb (6) | N/A | 24.0 ppb (22) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 29.0 | |
| March 19, 2019, 10 p.m. | 44.0 ppb (41) | 12.0 ppb (11) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 41.0 | |
| March 19, 2019, 9 p.m. | 44.0 ppb (41) | 9.0 ppb (8) | N/A | 35.0 ppb (32) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 41.0 | |
| March 19, 2019, 8 p.m. | 30.0 ppb (28) | 2.0 ppb (2) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 28.0 | |
| March 19, 2019, 7 p.m. | 29.0 ppb (27) | 1.0 ppb (1) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 27.0 | |
| March 19, 2019, 6 p.m. | 28.0 ppb (26) | 1.0 ppb (1) | N/A | 27.0 ppb (25) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 26.0 | |
| March 19, 2019, 5 p.m. | 26.0 ppb (24) | 1.0 ppb (1) | N/A | 25.0 ppb (23) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 24.0 | |
| March 19, 2019, 4 p.m. | 22.0 ppb (20) | 1.0 ppb (1) | N/A | 21.0 ppb (19) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 20.0 | |
| March 19, 2019, 3 p.m. | 29.0 ppb (27) | 1.0 ppb (1) | N/A | 28.0 ppb (26) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 27.0 | |
| March 19, 2019, 2 p.m. | 48.0 ppb (44) | 4.0 ppb (4) | N/A | 44.0 ppb (41) | N/A | N/A | N/A | 0.7 ppb (8) | N/A | N/A | 44.0 | |
| March 19, 2019, 1 p.m. | 76.0 ppb (73) | 18.0 ppb (17) | N/A | 58.0 ppb (54) | N/A | N/A | N/A | 0.7 ppb (8) | N/A | N/A | 73.0 | |
| March 19, 2019, noon | 78.0 ppb (76) | 20.0 ppb (19) | N/A | 58.0 ppb (54) | N/A | N/A | N/A | 0.6 ppb (7) | N/A | N/A | 76.0 | |
| March 19, 2019, 11 a.m. | 101.0 ppb (100) | 37.0 ppb (34) | N/A | 64.0 ppb (61) | N/A | N/A | N/A | 0.6 ppb (7) | N/A | N/A | 100.0 | |
| March 19, 2019, 10 a.m. | 103.0 ppb (100) | 40.0 ppb (37) | N/A | 63.0 ppb (60) | N/A | N/A | N/A | 0.6 ppb (7) | N/A | N/A | 100.0 | |
| March 19, 2019, 9 a.m. | 143.0 ppb (108) | 71.0 ppb (68) | N/A | 72.0 ppb (69) | N/A | N/A | N/A | 0.8 ppb (9) | N/A | N/A | 108.0 | |
| March 19, 2019, 8 a.m. | 123.0 ppb (104) | 53.0 ppb (49) | N/A | 70.0 ppb (67) | N/A | N/A | N/A | 0.7 ppb (8) | N/A | N/A | 104.0 | |
| March 19, 2019, 7 a.m. | 99.0 ppb (98) | 37.0 ppb (34) | N/A | 62.0 ppb (59) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | N/A | 98.0 | |
| March 19, 2019, 6 a.m. | 71.0 ppb (68) | 24.0 ppb (22) | N/A | 47.0 ppb (44) | N/A | N/A | N/A | 0.2 ppb (2) | N/A | N/A | 68.0 | |
| March 19, 2019, 5 a.m. | 100.0 ppb (99) | 42.0 ppb (39) | N/A | 58.0 ppb (54) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 99.0 | |
| March 19, 2019, 4 a.m. | 90.0 ppb (88) | 36.0 ppb (33) | N/A | 54.0 ppb (50) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 88.0 | |
| March 19, 2019, 3 a.m. | 90.0 ppb (88) | 39.0 ppb (36) | N/A | 51.0 ppb (47) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 88.0 | |
| March 19, 2019, 2 a.m. | 146.0 ppb (109) | 81.0 ppb (79) | N/A | 65.0 ppb (62) | N/A | N/A | N/A | 0.3 ppb (3) | N/A | N/A | 109.0 | |
| March 19, 2019, 1 a.m. | 166.0 ppb (112) | 99.0 ppb (98) | N/A | 67.0 ppb (64) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | N/A | 112.0 | |
| March 19, 2019, midnight | 119.0 ppb (103) | 62.0 ppb (59) | N/A | 57.0 ppb (53) | N/A | N/A | N/A | 0.5 ppb (6) | N/A | N/A | 103.0 | |
| March 18, 2019, 11 p.m. | 49.0 ppb (45) | 17.0 ppb (16) | N/A | 32.0 ppb (30) | N/A | N/A | N/A | 0.4 ppb (4) | N/A | N/A | 45.0 |