AQSQID: 240270006

Site Name: Howard County Near Road

Location: Howard Co, MD

Reporting: True, Located: True

Current AQI: 17.0

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
Jan. 16, 2019, 9 p.m. 24.4 ppb (23) 7.3 ppb (7) N/A 17.0 ppb (16) N/A N/A N/A 0.17 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 16, 2019, 8 p.m. 18.6 ppb (17) 5.0 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A 0.15 ppb (2) N/A 3.0 μg/m3 (12) 17.0
 
Jan. 16, 2019, 7 p.m. 21.5 ppb (20) 8.0 ppb (7) N/A 13.0 ppb (12) N/A N/A N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 16, 2019, 6 p.m. 23.2 ppb (21) 9.4 ppb (9) N/A 14.0 ppb (13) N/A N/A N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 16, 2019, 5 p.m. 32.8 ppb (30) 15.7 ppb (15) N/A 17.0 ppb (16) N/A N/A N/A 0.22 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 16, 2019, 4 p.m. 45.1 ppb (42) 23.6 ppb (22) N/A 22.0 ppb (20) N/A N/A N/A 0.29 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 16, 2019, 3 p.m. 57.5 ppb (54) 33.7 ppb (31) N/A 24.0 ppb (22) N/A N/A N/A 0.35 ppb (4) N/A 9.0 μg/m3 (38) 54.0
 
Jan. 16, 2019, 2 p.m. 103.0 ppb (100) 71.8 ppb (69) N/A 31.0 ppb (29) N/A N/A N/A 0.49 ppb (5) N/A 17.0 μg/m3 (61) 100.0
 
Jan. 16, 2019, 1 p.m. 136.1 ppb (107) 101.2 ppb (100) N/A 35.0 ppb (32) N/A N/A N/A 0.58 ppb (6) N/A 13.0 μg/m3 (52) 107.0
 
Jan. 16, 2019, noon 143.7 ppb (108) 106.9 ppb (101) N/A 37.0 ppb (34) N/A N/A N/A 0.55 ppb (6) N/A 17.0 μg/m3 (61) 108.0
 
Jan. 16, 2019, 11 a.m. 115.6 ppb (103) 80.5 ppb (78) N/A 35.0 ppb (32) N/A N/A N/A 0.5 ppb (6) N/A 17.0 μg/m3 (61) 103.0
 
Jan. 16, 2019, 10 a.m. 64.9 ppb (62) 37.7 ppb (35) N/A 27.0 ppb (25) N/A N/A N/A 0.4 ppb (4) N/A 14.0 μg/m3 (54) 62.0
 
Jan. 16, 2019, 9 a.m. 87.6 ppb (86) 59.3 ppb (56) N/A 28.0 ppb (26) N/A N/A N/A 0.43 ppb (5) N/A 18.0 μg/m3 (63) 86.0
 
Jan. 16, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.39 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 16, 2019, 7 a.m. 31.3 ppb (29) 10.7 ppb (10) N/A 21.0 ppb (19) N/A N/A N/A 0.34 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 16, 2019, 6 a.m. 35.1 ppb (32) 13.6 ppb (13) N/A 22.0 ppb (20) N/A N/A N/A N/A N/A 16.0 μg/m3 (59) 59.0
 
Jan. 16, 2019, 5 a.m. 24.3 ppb (23) 6.3 ppb (6) N/A 18.0 ppb (17) N/A N/A N/A 0.34 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 16, 2019, 4 a.m. 30.7 ppb (28) 9.6 ppb (9) N/A 21.0 ppb (19) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Jan. 16, 2019, 3 a.m. 33.4 ppb (31) 9.2 ppb (9) N/A 24.0 ppb (22) N/A N/A N/A 0.35 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 16, 2019, 2 a.m. 43.2 ppb (40) 17.8 ppb (16) N/A 25.0 ppb (23) N/A N/A N/A 0.35 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
Jan. 16, 2019, 1 a.m. 46.4 ppb (43) 22.9 ppb (21) N/A 23.0 ppb (21) N/A N/A N/A 0.35 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
Jan. 16, 2019, midnight 42.9 ppb (40) 20.2 ppb (19) N/A 23.0 ppb (21) N/A N/A N/A 0.33 ppb (4) N/A 9.0 μg/m3 (38) 40.0
 
Jan. 15, 2019, 11 p.m. 24.3 ppb (23) 6.6 ppb (6) N/A 18.0 ppb (17) N/A N/A N/A 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 15, 2019, 10 p.m. 16.5 ppb (15) 3.0 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.23 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 15, 2019, 9 p.m. 13.7 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.2 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
Jan. 15, 2019, 8 p.m. 12.2 ppb (11) 2.2 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.18 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 15, 2019, 7 p.m. 12.1 ppb (11) 2.6 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.14 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 15, 2019, 6 p.m. 19.0 ppb (18) 4.6 ppb (4) N/A 14.0 ppb (13) N/A N/A N/A 0.11 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 15, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 15, 2019, 4 p.m. 34.7 ppb (32) 21.0 ppb (19) N/A 14.0 ppb (13) N/A N/A N/A 0.29 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 15, 2019, 3 p.m. 45.7 ppb (42) 29.0 ppb (27) N/A 17.0 ppb (16) N/A N/A N/A 0.31 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 15, 2019, 2 p.m. 61.6 ppb (58) 40.0 ppb (37) N/A 22.0 ppb (20) N/A N/A N/A 0.36 ppb (4) N/A 12.0 μg/m3 (50) 58.0
 
Jan. 15, 2019, 1 p.m. 139.2 ppb (107) 103.8 ppb (101) N/A 35.0 ppb (32) N/A N/A N/A 0.54 ppb (6) N/A 19.0 μg/m3 (65) 107.0
 
Jan. 15, 2019, noon 117.0 ppb (103) 84.2 ppb (82) N/A 33.0 ppb (31) N/A N/A N/A 0.46 ppb (5) N/A 16.0 μg/m3 (59) 103.0
 
Jan. 15, 2019, 11 a.m. 155.5 ppb (110) 117.8 ppb (103) N/A 38.0 ppb (35) N/A N/A N/A 0.51 ppb (6) N/A 22.0 μg/m3 (71) 110.0
 
Jan. 15, 2019, 10 a.m. 129.3 ppb (105) 92.4 ppb (91) N/A 37.0 ppb (34) N/A N/A N/A 0.48 ppb (5) N/A 14.0 μg/m3 (54) 105.0
 
Jan. 15, 2019, 9 a.m. 115.1 ppb (103) 77.9 ppb (75) N/A 37.0 ppb (34) N/A N/A N/A 0.43 ppb (5) N/A 18.0 μg/m3 (63) 103.0
 
Jan. 15, 2019, 8 a.m. 93.1 ppb (92) 59.2 ppb (56) N/A 34.0 ppb (31) N/A N/A N/A 0.4 ppb (4) N/A 18.0 μg/m3 (63) 92.0
 
Jan. 15, 2019, 7 a.m. 69.2 ppb (66) 38.1 ppb (35) N/A 31.0 ppb (29) N/A N/A N/A N/A N/A 16.0 μg/m3 (59) 66.0
 
Jan. 15, 2019, 6 a.m. 48.7 ppb (45) 21.4 ppb (20) N/A 27.0 ppb (25) N/A N/A N/A 0.33 ppb (4) N/A 19.0 μg/m3 (65) 65.0
 
Jan. 15, 2019, 5 a.m. 42.7 ppb (40) 16.0 ppb (15) N/A 27.0 ppb (25) N/A N/A N/A 0.34 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 15, 2019, 4 a.m. 80.0 ppb (78) 45.0 ppb (42) N/A 35.0 ppb (32) N/A N/A N/A N/A N/A 14.0 μg/m3 (54) 78.0
 
Jan. 15, 2019, 3 a.m. 89.7 ppb (88) 51.9 ppb (48) N/A 38.0 ppb (35) N/A N/A N/A 0.39 ppb (4) N/A 19.0 μg/m3 (65) 88.0
 
Jan. 15, 2019, 2 a.m. 54.1 ppb (50) 22.8 ppb (21) N/A 31.0 ppb (29) N/A N/A N/A 0.34 ppb (4) N/A 21.0 μg/m3 (69) 69.0
 
Jan. 15, 2019, 1 a.m. 47.4 ppb (44) 16.6 ppb (15) N/A 31.0 ppb (29) N/A N/A N/A 0.3 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 15, 2019, midnight 43.8 ppb (41) 16.0 ppb (15) N/A 28.0 ppb (26) N/A N/A N/A 0.29 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 14, 2019, 11 p.m. 19.3 ppb (18) 3.8 ppb (4) N/A 16.0 ppb (15) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 14, 2019, 10 p.m. 15.7 ppb (15) 3.3 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 14, 2019, 9 p.m. 14.7 ppb (14) 3.1 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.2 ppb (2) N/A 2.0 μg/m3 (8) 14.0
 
Jan. 14, 2019, 8 p.m. 14.5 ppb (13) 4.5 ppb (4) N/A 10.0 ppb (9) N/A N/A N/A 0.19 ppb (2) N/A 2.0 μg/m3 (8) 13.0
 
Jan. 14, 2019, 7 p.m. 13.6 ppb (13) 4.4 ppb (4) N/A 9.0 ppb (8) N/A N/A N/A 0.19 ppb (2) N/A 1.0 μg/m3 (4) 13.0
 
Jan. 14, 2019, 6 p.m. 15.4 ppb (14) 5.4 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 14, 2019, 5 p.m. 21.2 ppb (20) 8.9 ppb (8) N/A 12.0 ppb (11) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 14, 2019, 4 p.m. 22.0 ppb (20) 9.0 ppb (8) N/A 13.0 ppb (12) N/A N/A N/A 0.23 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 14, 2019, 3 p.m. 23.3 ppb (22) 9.4 ppb (9) N/A 14.0 ppb (13) N/A N/A N/A 0.24 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 14, 2019, 2 p.m. 20.8 ppb (19) 7.6 ppb (7) N/A 13.0 ppb (12) N/A N/A N/A 0.23 ppb (3) N/A 3.0 μg/m3 (12) 19.0
 
Jan. 14, 2019, 1 p.m. 23.1 ppb (21) 5.8 ppb (5) N/A 17.0 ppb (16) N/A N/A N/A 0.23 ppb (3) N/A 3.0 μg/m3 (12) 21.0
 
Jan. 14, 2019, noon 29.6 ppb (27) 7.9 ppb (7) N/A 22.0 ppb (20) N/A N/A N/A 0.24 ppb (3) N/A 4.0 μg/m3 (17) 27.0
 
Jan. 14, 2019, 11 a.m. 37.1 ppb (34) 11.3 ppb (10) N/A 26.0 ppb (24) N/A N/A N/A 0.23 ppb (3) N/A 3.0 μg/m3 (12) 34.0
 
Jan. 14, 2019, 10 a.m. 22.8 ppb (21) 4.4 ppb (4) N/A 18.0 ppb (17) N/A N/A N/A 0.22 ppb (2) N/A 2.0 μg/m3 (8) 21.0
 
Jan. 14, 2019, 9 a.m. 30.2 ppb (28) 6.3 ppb (6) N/A 24.0 ppb (22) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 28.0
 
Jan. 14, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 14, 2019, 7 a.m. 33.4 ppb (31) 8.8 ppb (8) N/A 25.0 ppb (23) N/A N/A N/A 0.23 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 14, 2019, 6 a.m. 22.4 ppb (21) 4.5 ppb (4) N/A 18.0 ppb (17) N/A N/A N/A 0.19 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 14, 2019, 5 a.m. 36.9 ppb (34) 11.2 ppb (10) N/A 26.0 ppb (24) N/A N/A N/A 0.2 ppb (2) N/A 8.0 μg/m3 (33) 34.0
 
Jan. 14, 2019, 4 a.m. 30.4 ppb (28) 8.6 ppb (8) N/A 22.0 ppb (20) N/A N/A N/A 0.25 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 14, 2019, 3 a.m. 16.0 ppb (15) 1.6 ppb (1) N/A 14.0 ppb (13) N/A N/A N/A 0.21 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 14, 2019, 2 a.m. 22.5 ppb (21) 3.9 ppb (4) N/A 19.0 ppb (18) N/A N/A N/A 0.21 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 14, 2019, 1 a.m. 13.2 ppb (12) 1.7 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.17 ppb (2) N/A 2.0 μg/m3 (8) 12.0
 
Jan. 14, 2019, midnight 19.2 ppb (18) 3.2 ppb (3) N/A 16.0 ppb (15) N/A N/A N/A 0.19 ppb (2) N/A 16.0 μg/m3 (59) 59.0
 
Jan. 13, 2019, 11 p.m. 23.9 ppb (22) 5.1 ppb (5) N/A 19.0 ppb (18) N/A N/A N/A 0.2 ppb (2) N/A 14.0 μg/m3 (54) 54.0
 
Jan. 13, 2019, 10 p.m. 23.4 ppb (22) 4.3 ppb (4) N/A 19.0 ppb (18) N/A N/A N/A 0.22 ppb (2) N/A 17.0 μg/m3 (61) 61.0
 
Jan. 13, 2019, 9 p.m. 24.5 ppb (23) 5.0 ppb (5) N/A 19.0 ppb (18) N/A N/A N/A 0.24 ppb (3) N/A 18.0 μg/m3 (63) 63.0
 
Jan. 13, 2019, 8 p.m. 27.0 ppb (25) 8.0 ppb (7) N/A 19.0 ppb (18) N/A N/A N/A 0.26 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 13, 2019, 7 p.m. 26.1 ppb (24) 7.1 ppb (7) N/A 19.0 ppb (18) N/A N/A N/A 0.26 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
Jan. 13, 2019, 6 p.m. 25.5 ppb (24) 8.9 ppb (8) N/A 17.0 ppb (16) N/A N/A N/A 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 13, 2019, 5 p.m. 25.3 ppb (23) 9.1 ppb (8) N/A 16.0 ppb (15) N/A N/A N/A 0.26 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 13, 2019, 4 p.m. 24.3 ppb (23) 8.5 ppb (8) N/A 16.0 ppb (15) N/A N/A N/A 0.23 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 13, 2019, 3 p.m. 24.1 ppb (22) 7.8 ppb (7) N/A 16.0 ppb (15) N/A N/A N/A 0.21 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 13, 2019, 2 p.m. 23.5 ppb (22) 7.0 ppb (6) N/A 17.0 ppb (16) N/A N/A N/A 0.2 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 13, 2019, 1 p.m. 23.9 ppb (22) 6.3 ppb (6) N/A 18.0 ppb (17) N/A N/A N/A 0.21 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 13, 2019, noon 24.7 ppb (23) 5.5 ppb (5) N/A 19.0 ppb (18) N/A N/A N/A 0.2 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 13, 2019, 11 a.m. 20.9 ppb (19) 2.9 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A 0.17 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 13, 2019, 10 a.m. 18.5 ppb (17) 3.6 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.15 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 13, 2019, 9 a.m. 21.3 ppb (20) 5.7 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A 0.13 ppb (1) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 13, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.13 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 13, 2019, 7 a.m. 16.5 ppb (15) 3.5 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.17 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 13, 2019, 6 a.m. 20.4 ppb (19) 5.1 ppb (5) N/A 15.0 ppb (14) N/A N/A N/A 0.15 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 13, 2019, 5 a.m. 26.6 ppb (25) 8.8 ppb (8) N/A 18.0 ppb (17) N/A N/A N/A 0.17 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 13, 2019, 4 a.m. 32.7 ppb (30) 11.1 ppb (10) N/A 22.0 ppb (20) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Jan. 13, 2019, 3 a.m. 32.7 ppb (30) 11.1 ppb (10) N/A 22.0 ppb (20) N/A N/A N/A 0.17 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 13, 2019, 2 a.m. 27.0 ppb (25) 9.2 ppb (9) N/A 18.0 ppb (17) N/A N/A N/A 0.14 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 13, 2019, 1 a.m. 26.3 ppb (24) 8.7 ppb (8) N/A 18.0 ppb (17) N/A N/A N/A 0.14 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 13, 2019, midnight 25.6 ppb (24) 8.8 ppb (8) N/A 17.0 ppb (16) N/A N/A N/A 0.19 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 12, 2019, 11 p.m. 34.5 ppb (32) 15.0 ppb (14) N/A 20.0 ppb (19) N/A N/A N/A 0.26 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 12, 2019, 10 p.m. 39.0 ppb (36) 17.2 ppb (16) N/A 22.0 ppb (20) N/A N/A N/A 0.34 ppb (4) N/A 6.0 μg/m3 (25) 36.0
 
Jan. 12, 2019, 9 p.m. 36.0 ppb (33) 16.3 ppb (15) N/A 20.0 ppb (19) N/A N/A N/A 0.36 ppb (4) N/A 5.0 μg/m3 (21) 33.0
 
Jan. 12, 2019, 8 p.m. 36.0 ppb (33) 16.9 ppb (16) N/A 19.0 ppb (18) N/A N/A N/A 0.35 ppb (4) N/A 4.0 μg/m3 (17) 33.0
 
Jan. 12, 2019, 7 p.m. 39.1 ppb (36) 17.7 ppb (16) N/A 21.0 ppb (19) N/A N/A N/A 0.34 ppb (4) N/A 6.0 μg/m3 (25) 36.0
 
Jan. 12, 2019, 6 p.m. 39.7 ppb (37) 19.1 ppb (18) N/A 21.0 ppb (19) N/A N/A N/A 0.34 ppb (4) N/A 6.0 μg/m3 (25) 37.0
 
Jan. 12, 2019, 5 p.m. 41.2 ppb (38) 21.7 ppb (20) N/A 19.0 ppb (18) N/A N/A N/A 0.34 ppb (4) N/A 6.0 μg/m3 (25) 38.0
 
Jan. 12, 2019, 4 p.m. 44.7 ppb (41) 24.1 ppb (22) N/A 21.0 ppb (19) N/A N/A N/A 0.36 ppb (4) N/A 3.0 μg/m3 (12) 41.0
 
Jan. 12, 2019, 3 p.m. 44.6 ppb (41) 23.8 ppb (22) N/A 21.0 ppb (19) N/A N/A N/A 0.37 ppb (4) N/A 7.0 μg/m3 (29) 41.0
 
Jan. 12, 2019, 2 p.m. 73.5 ppb (71) 43.8 ppb (41) N/A 30.0 ppb (28) N/A N/A N/A 0.48 ppb (5) N/A 13.0 μg/m3 (52) 71.0
 
Jan. 12, 2019, 1 p.m. 84.3 ppb (82) 50.9 ppb (47) N/A 33.0 ppb (31) N/A N/A N/A 0.51 ppb (6) N/A 15.0 μg/m3 (56) 82.0
 
Jan. 12, 2019, noon 86.5 ppb (85) 55.0 ppb (51) N/A 31.0 ppb (29) N/A N/A N/A 0.46 ppb (5) N/A 17.0 μg/m3 (61) 85.0
 
Jan. 12, 2019, 11 a.m. 91.8 ppb (90) 62.4 ppb (59) N/A 29.0 ppb (27) N/A N/A N/A 0.4 ppb (4) N/A 14.0 μg/m3 (54) 90.0
 
Jan. 12, 2019, 10 a.m. 64.5 ppb (61) 39.7 ppb (37) N/A 25.0 ppb (23) N/A N/A N/A 0.36 ppb (4) N/A 11.0 μg/m3 (46) 61.0
 
Jan. 12, 2019, 9 a.m. 64.0 ppb (61) 41.1 ppb (38) N/A 23.0 ppb (21) N/A N/A N/A 0.32 ppb (4) N/A 12.0 μg/m3 (50) 61.0
 
Jan. 12, 2019, 8 a.m. 66.6 ppb (63) 41.2 ppb (38) N/A 25.0 ppb (23) N/A N/A N/A 0.33 ppb (4) N/A 9.0 μg/m3 (38) 63.0
 
Jan. 12, 2019, 7 a.m. 66.5 ppb (63) 41.4 ppb (38) N/A 25.0 ppb (23) N/A N/A N/A 0.33 ppb (4) N/A 8.0 μg/m3 (33) 63.0
 
Jan. 12, 2019, 6 a.m. 53.4 ppb (49) 29.0 ppb (27) N/A 24.0 ppb (22) N/A N/A N/A 0.28 ppb (3) N/A 8.0 μg/m3 (33) 49.0
 
Jan. 12, 2019, 5 a.m. 58.1 ppb (54) 32.0 ppb (30) N/A 26.0 ppb (24) N/A N/A N/A 0.31 ppb (3) N/A 12.0 μg/m3 (50) 54.0
 
Jan. 12, 2019, 4 a.m. 36.8 ppb (34) 16.5 ppb (15) N/A 20.0 ppb (19) N/A N/A N/A 0.3 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 12, 2019, 3 a.m. 44.5 ppb (41) 21.5 ppb (20) N/A 23.0 ppb (21) N/A N/A N/A 0.33 ppb (4) N/A 8.0 μg/m3 (33) 41.0
 
Jan. 12, 2019, 2 a.m. 33.2 ppb (31) 12.6 ppb (12) N/A 21.0 ppb (19) N/A N/A N/A 0.3 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 12, 2019, 1 a.m. 21.0 ppb (19) 5.6 ppb (5) N/A 15.0 ppb (14) N/A N/A N/A 0.28 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 12, 2019, midnight 20.5 ppb (19) 6.3 ppb (6) N/A 14.0 ppb (13) N/A N/A N/A 0.25 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 11, 2019, 11 p.m. 18.1 ppb (17) 5.3 ppb (5) N/A 13.0 ppb (12) N/A N/A N/A 0.22 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 11, 2019, 10 p.m. 11.0 ppb (10) 1.9 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.19 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 11, 2019, 9 p.m. 8.3 ppb (8) 1.0 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 11, 2019, 8 p.m. 8.2 ppb (8) 1.3 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 11, 2019, 7 p.m. 7.4 ppb (7) 1.2 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 11, 2019, 6 p.m. 8.1 ppb (8) 1.5 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 11, 2019, 5 p.m. 7.9 ppb (7) 1.6 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 11, 2019, 4 p.m. 7.4 ppb (7) 1.3 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 7.0
 
Jan. 11, 2019, 3 p.m. 8.4 ppb (8) 1.7 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 0.0 μg/m3 (0) 8.0
 
Jan. 11, 2019, 2 p.m. 8.8 ppb (8) 1.7 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.18 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 11, 2019, 1 p.m. 8.3 ppb (8) 1.3 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.18 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 11, 2019, noon 15.3 ppb (14) 3.6 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.19 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 11, 2019, 11 a.m. 11.9 ppb (11) 2.5 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
 
Jan. 11, 2019, 10 a.m. 17.6 ppb (16) 4.8 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 11, 2019, 9 a.m. 19.5 ppb (18) 6.1 ppb (6) N/A 13.0 ppb (12) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 18.0
 
Jan. 11, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 11, 2019, 7 a.m. 23.4 ppb (22) 9.4 ppb (9) N/A 14.0 ppb (13) N/A N/A N/A 0.16 ppb (2) N/A 3.0 μg/m3 (12) 22.0
 
Jan. 11, 2019, 6 a.m. 17.2 ppb (16) 5.1 ppb (5) N/A 12.0 ppb (11) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 16.0
 
Jan. 11, 2019, 5 a.m. 19.5 ppb (18) 6.6 ppb (6) N/A 13.0 ppb (12) N/A N/A N/A 0.19 ppb (2) N/A 3.0 μg/m3 (12) 18.0
 
Jan. 11, 2019, 4 a.m. 15.8 ppb (15) 4.6 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 11, 2019, 3 a.m. 15.5 ppb (14) 4.8 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.06 ppb (1) N/A 2.0 μg/m3 (8) 14.0
 
Jan. 11, 2019, 2 a.m. 14.6 ppb (14) 4.2 ppb (4) N/A 10.0 ppb (9) N/A N/A N/A 0.06 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 11, 2019, 1 a.m. 14.7 ppb (14) 4.7 ppb (4) N/A 10.0 ppb (9) N/A N/A N/A 0.07 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 11, 2019, midnight 9.9 ppb (9) 2.1 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.05 ppb (1) N/A 2.0 μg/m3 (8) 9.0
 
Jan. 10, 2019, 11 p.m. 8.1 ppb (8) 1.3 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.05 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 10, 2019, 10 p.m. 7.2 ppb (7) 0.6 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.05 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 10, 2019, 9 p.m. 7.7 ppb (7) 0.9 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.05 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 10, 2019, 8 p.m. 8.0 ppb (7) 1.4 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.05 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 10, 2019, 7 p.m. 7.8 ppb (7) 1.6 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.05 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 10, 2019, 6 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.05 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 10, 2019, 5 p.m. 7.0 ppb (6) 1.6 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.04 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 10, 2019, 4 p.m. 6.9 ppb (6) 1.4 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Jan. 10, 2019, 3 p.m. 6.5 ppb (6) 1.3 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 10, 2019, 2 p.m. 6.9 ppb (6) 1.4 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.06 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 10, 2019, 1 p.m. 6.2 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.07 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 10, 2019, noon 7.4 ppb (7) 1.1 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.09 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 10, 2019, 11 a.m. 11.0 ppb (10) 3.3 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.09 ppb (1) N/A 2.0 μg/m3 (8) 10.0
 
Jan. 10, 2019, 10 a.m. 10.9 ppb (10) 4.2 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A 0.09 ppb (1) N/A 2.0 μg/m3 (8) 10.0
 
Jan. 10, 2019, 9 a.m. 8.9 ppb (8) 2.6 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.09 ppb (1) N/A 1.0 μg/m3 (4) 8.0
 
Jan. 10, 2019, 8 a.m. 8.6 ppb (8) 2.4 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.12 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 10, 2019, 7 a.m. 8.7 ppb (8) 2.4 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.12 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 10, 2019, 6 a.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.13 ppb (1) N/A 0.0 μg/m3 (0) 7.0
 
Jan. 10, 2019, 5 a.m. 11.1 ppb (10) 3.1 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.14 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 10, 2019, 4 a.m. 11.9 ppb (11) 3.3 ppb (3) 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
 
Jan. 10, 2019, 3 a.m. 11.1 ppb (10) 3.2 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.4 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 10, 2019, 2 a.m. 9.6 ppb (9) 2.2 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.4 ppb (4) N/A 1.0 μg/m3 (4) 9.0
 
Jan. 10, 2019, 1 a.m. 9.6 ppb (9) 2.2 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.39 ppb (4) N/A 2.0 μg/m3 (8) 9.0
 
Jan. 10, 2019, midnight 8.3 ppb (8) 1.5 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.41 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 9, 2019, 11 p.m. 8.3 ppb (8) 1.4 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.39 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 9, 2019, 10 p.m. 8.6 ppb (8) 1.4 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.35 ppb (4) N/A 5.0 μg/m3 (21) 21.0