AQSQID: 240270006

Site Name: Howard County Near Road

Location: Laurel (I 95), MD

Reporting: True, Located: True

Current AQI: 21.0

Laurel (I 95) MD, US: 39.143197, -76.846192

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Jan. 17, 2020, 2 p.m. 6.8 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 17, 2020, 1 p.m. 11.0 ppb (10) 2.2 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 17, 2020, noon 13.2 ppb (12) 2.9 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 12.0
 
Jan. 17, 2020, 11 a.m. 13.6 ppb (13) 3.4 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 17, 2020, 10 a.m. 12.8 ppb (12) 3.1 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 17, 2020, 9 a.m. 11.9 ppb (11) 2.9 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 17, 2020, 7 a.m. 11.0 ppb (10) 2.4 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 17, 2020, 6 a.m. 10.2 ppb (9) 2.2 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 17, 2020, 5 a.m. 10.6 ppb (10) 2.2 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 10.0
 
Jan. 17, 2020, 4 a.m. 10.3 ppb (10) 2.8 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 17, 2020, 3 a.m. 7.0 ppb (6) 1.3 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 17, 2020, 2 a.m. 7.0 ppb (6) 1.3 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 17, 2020, 1 a.m. 6.3 ppb (6) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 17, 2020, midnight 8.3 ppb (8) 1.3 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 16, 2020, 11 p.m. 8.7 ppb (8) 1.7 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 16, 2020, 10 p.m. 5.5 ppb (5) 0.6 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. 16, 2020, 9 p.m. 6.1 ppb (6) 0.8 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. 16, 2020, 8 p.m. 6.4 ppb (6) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Jan. 16, 2020, 7 p.m. 6.5 ppb (6) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 16, 2020, 6 p.m. 6.9 ppb (6) 0.9 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 16, 2020, 5 p.m. 7.7 ppb (7) 1.1 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.19 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 16, 2020, 4 p.m. 8.6 ppb (8) 1.2 ppb (1) 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. 16, 2020, 3 p.m. 9.9 ppb (9) 1.3 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.17 ppb (2) N/A 2.0 μg/m3 (8) 9.0
 
Jan. 16, 2020, 2 p.m. 12.0 ppb (11) 2.2 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.18 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 16, 2020, 1 p.m. 16.0 ppb (15) 4.9 ppb (5) N/A 11.0 ppb (10) N/A N/A N/A 0.19 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 16, 2020, noon 27.9 ppb (26) 15.1 ppb (14) N/A 13.0 ppb (12) N/A N/A N/A 0.23 ppb (3) N/A 3.0 μg/m3 (12) 26.0
 
Jan. 16, 2020, 11 a.m. 34.2 ppb (32) 21.0 ppb (19) N/A 13.0 ppb (12) N/A N/A N/A 0.26 ppb (3) N/A 7.0 μg/m3 (29) 32.0
 
Jan. 16, 2020, 10 a.m. 38.5 ppb (36) 26.3 ppb (24) N/A 12.0 ppb (11) N/A N/A N/A 0.27 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 16, 2020, 9 a.m. 61.7 ppb (58) 45.0 ppb (42) N/A 17.0 ppb (16) N/A N/A N/A 0.31 ppb (3) N/A 10.0 μg/m3 (42) 58.0
 
Jan. 16, 2020, 8 a.m. 65.9 ppb (63) 47.7 ppb (44) N/A 18.0 ppb (17) N/A N/A N/A 0.3 ppb (3) N/A 9.0 μg/m3 (38) 63.0
 
Jan. 16, 2020, 7 a.m. 52.5 ppb (49) 34.7 ppb (32) N/A 18.0 ppb (17) N/A N/A N/A 0.29 ppb (3) N/A 9.0 μg/m3 (38) 49.0
 
Jan. 16, 2020, 6 a.m. 50.4 ppb (47) 32.9 ppb (30) N/A 18.0 ppb (17) N/A N/A N/A 0.3 ppb (3) N/A 9.0 μg/m3 (38) 47.0
 
Jan. 16, 2020, 5 a.m. 45.7 ppb (42) 28.7 ppb (27) N/A 17.0 ppb (16) N/A N/A N/A 0.31 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 16, 2020, 4 a.m. 43.0 ppb (40) 26.5 ppb (25) N/A 17.0 ppb (16) N/A N/A N/A 0.34 ppb (4) N/A 9.0 μg/m3 (38) 40.0
 
Jan. 16, 2020, 3 a.m. 42.5 ppb (39) 25.5 ppb (24) N/A 17.0 ppb (16) N/A N/A N/A 0.43 ppb (5) N/A 7.0 μg/m3 (29) 39.0
 
Jan. 16, 2020, 2 a.m. 39.6 ppb (37) 22.7 ppb (21) N/A 17.0 ppb (16) N/A N/A N/A 0.44 ppb (5) N/A 7.0 μg/m3 (29) 37.0
 
Jan. 16, 2020, 1 a.m. 43.5 ppb (40) 25.4 ppb (24) N/A 18.0 ppb (17) N/A N/A N/A 0.45 ppb (5) N/A 7.0 μg/m3 (29) 40.0
 
Jan. 16, 2020, midnight 41.8 ppb (39) 23.6 ppb (22) N/A 18.0 ppb (17) N/A N/A N/A 0.48 ppb (5) N/A 8.0 μg/m3 (33) 39.0
 
Jan. 15, 2020, 11 p.m. 46.6 ppb (43) 27.4 ppb (25) N/A 19.0 ppb (18) N/A N/A N/A 0.51 ppb (6) N/A 9.0 μg/m3 (38) 43.0
 
Jan. 15, 2020, 10 p.m. 43.1 ppb (40) 24.5 ppb (23) N/A 19.0 ppb (18) N/A N/A N/A 0.47 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 15, 2020, 9 p.m. 43.3 ppb (40) 24.3 ppb (23) N/A 19.0 ppb (18) N/A N/A N/A 0.45 ppb (5) N/A 8.0 μg/m3 (33) 40.0
 
Jan. 15, 2020, 8 p.m. 47.6 ppb (44) 26.3 ppb (24) N/A 21.0 ppb (19) N/A N/A N/A 0.43 ppb (5) N/A 7.0 μg/m3 (29) 44.0
 
Jan. 15, 2020, 7 p.m. 40.2 ppb (37) 22.2 ppb (21) N/A 18.0 ppb (17) N/A N/A N/A 0.37 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 15, 2020, 6 p.m. 40.0 ppb (37) 25.1 ppb (23) N/A 15.0 ppb (14) N/A N/A N/A 0.38 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 15, 2020, 5 p.m. 59.5 ppb (56) 42.0 ppb (39) N/A 17.0 ppb (16) N/A N/A N/A 0.47 ppb (5) N/A 7.0 μg/m3 (29) 56.0
 
Jan. 15, 2020, 4 p.m. 59.5 ppb (56) 43.0 ppb (40) N/A 17.0 ppb (16) N/A N/A N/A 0.49 ppb (5) N/A 10.0 μg/m3 (42) 56.0
 
Jan. 15, 2020, 3 p.m. 61.8 ppb (58) 46.0 ppb (43) N/A 16.0 ppb (15) N/A N/A N/A 0.5 ppb (6) N/A 8.0 μg/m3 (33) 58.0
 
Jan. 15, 2020, 2 p.m. 48.4 ppb (45) 33.6 ppb (31) N/A 15.0 ppb (14) N/A N/A N/A 0.43 ppb (5) N/A 9.0 μg/m3 (38) 45.0
 
Jan. 15, 2020, 1 p.m. 40.7 ppb (38) 27.8 ppb (26) N/A 13.0 ppb (12) N/A N/A N/A 0.4 ppb (4) N/A 8.0 μg/m3 (33) 38.0
 
Jan. 15, 2020, noon 28.9 ppb (27) 16.6 ppb (15) N/A 12.0 ppb (11) N/A N/A N/A 0.33 ppb (4) N/A 6.0 μg/m3 (25) 27.0
 
Jan. 15, 2020, 11 a.m. 29.8 ppb (28) 16.7 ppb (15) N/A 13.0 ppb (12) N/A N/A N/A 0.32 ppb (4) N/A 6.0 μg/m3 (25) 28.0
 
Jan. 15, 2020, 10 a.m. 36.1 ppb (33) 22.6 ppb (21) N/A 13.0 ppb (12) N/A N/A N/A 0.33 ppb (4) N/A 5.0 μg/m3 (21) 33.0
 
Jan. 15, 2020, 9 a.m. 29.4 ppb (27) 16.0 ppb (15) N/A 13.0 ppb (12) N/A N/A N/A 0.31 ppb (3) N/A 3.0 μg/m3 (12) 27.0
 
Jan. 15, 2020, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.27 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 15, 2020, 7 a.m. 23.1 ppb (21) 9.4 ppb (9) N/A 14.0 ppb (13) N/A N/A N/A 0.27 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 15, 2020, 6 a.m. 20.4 ppb (19) 7.5 ppb (7) N/A 13.0 ppb (12) N/A N/A N/A 0.28 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 15, 2020, 5 a.m. 22.9 ppb (21) 9.8 ppb (9) N/A 13.0 ppb (12) N/A N/A N/A 0.3 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 15, 2020, 4 a.m. 27.8 ppb (26) 14.2 ppb (13) N/A 14.0 ppb (13) N/A N/A N/A 0.3 ppb (3) N/A 6.0 μg/m3 (25) 26.0
 
Jan. 15, 2020, 3 a.m. 31.3 ppb (29) 16.6 ppb (15) N/A 15.0 ppb (14) N/A N/A N/A 0.27 ppb (3) N/A 6.0 μg/m3 (25) 29.0
 
Jan. 15, 2020, 2 a.m. 33.7 ppb (31) 18.0 ppb (17) N/A 16.0 ppb (15) N/A N/A N/A 0.29 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 15, 2020, 1 a.m. 37.1 ppb (34) 20.6 ppb (19) N/A 16.0 ppb (15) N/A N/A N/A 0.3 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 15, 2020, midnight 43.1 ppb (40) 26.4 ppb (24) N/A 17.0 ppb (16) N/A N/A N/A 0.33 ppb (4) N/A 8.0 μg/m3 (33) 40.0
 
Jan. 14, 2020, 11 p.m. 43.0 ppb (40) 26.1 ppb (24) N/A 17.0 ppb (16) N/A N/A N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 40.0
 
Jan. 14, 2020, 10 p.m. 47.3 ppb (44) 30.2 ppb (28) N/A 17.0 ppb (16) N/A N/A N/A 0.36 ppb (4) N/A 10.0 μg/m3 (42) 44.0
 
Jan. 14, 2020, 9 p.m. 52.3 ppb (48) 35.4 ppb (33) N/A 17.0 ppb (16) N/A N/A N/A 0.36 ppb (4) N/A 7.0 μg/m3 (29) 48.0
 
Jan. 14, 2020, 8 p.m. 54.5 ppb (51) 37.3 ppb (35) N/A 17.0 ppb (16) N/A N/A N/A 0.34 ppb (4) N/A 8.0 μg/m3 (33) 51.0
 
Jan. 14, 2020, 7 p.m. 56.4 ppb (53) 38.2 ppb (35) N/A 18.0 ppb (17) N/A N/A N/A 0.32 ppb (4) N/A 11.0 μg/m3 (46) 53.0
 
Jan. 14, 2020, 6 p.m. 60.1 ppb (56) 42.7 ppb (40) N/A 17.0 ppb (16) N/A N/A N/A 0.32 ppb (4) N/A 11.0 μg/m3 (46) 56.0
 
Jan. 14, 2020, 5 p.m. 70.4 ppb (67) 53.9 ppb (50) N/A 16.0 ppb (15) N/A N/A N/A 0.34 ppb (4) N/A 12.0 μg/m3 (50) 67.0
 
Jan. 14, 2020, 4 p.m. N/A N/A N/A N/A N/A N/A N/A 0.37 ppb (4) N/A 16.0 μg/m3 (59) 59.0
 
Jan. 14, 2020, 3 p.m. 82.6 ppb (80) 64.1 ppb (61) N/A 19.0 ppb (18) N/A N/A N/A 0.38 ppb (4) N/A 13.0 μg/m3 (52) 80.0
 
Jan. 14, 2020, 2 p.m. 81.7 ppb (79) 63.9 ppb (61) N/A 18.0 ppb (17) N/A N/A N/A 0.4 ppb (4) N/A 13.0 μg/m3 (52) 79.0
 
Jan. 14, 2020, 1 p.m. 79.6 ppb (77) 63.6 ppb (60) N/A 16.0 ppb (15) N/A N/A N/A 0.4 ppb (4) N/A 12.0 μg/m3 (50) 77.0
 
Jan. 14, 2020, noon 85.2 ppb (83) 68.6 ppb (66) N/A 17.0 ppb (16) N/A N/A N/A 0.46 ppb (5) N/A 8.0 μg/m3 (33) 83.0
 
Jan. 13, 2020, 9 p.m. 41.5 ppb (38) 24.2 ppb (22) N/A 17.0 ppb (16) N/A N/A N/A 0.34 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 13, 2020, 8 p.m. 26.3 ppb (24) 12.7 ppb (12) N/A 14.0 ppb (13) N/A N/A N/A 0.26 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 13, 2020, 7 p.m. 22.8 ppb (21) 10.7 ppb (10) N/A 12.0 ppb (11) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 13, 2020, 6 p.m. 22.7 ppb (21) 10.7 ppb (10) N/A 12.0 ppb (11) N/A N/A N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 13, 2020, 5 p.m. 25.0 ppb (23) 13.2 ppb (12) N/A 12.0 ppb (11) N/A N/A N/A 0.24 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 13, 2020, 4 p.m. 27.3 ppb (25) 14.6 ppb (14) N/A 13.0 ppb (12) N/A N/A N/A 0.29 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 13, 2020, 3 p.m. 30.4 ppb (28) 16.8 ppb (16) N/A 14.0 ppb (13) N/A N/A N/A 0.33 ppb (4) N/A 3.0 μg/m3 (12) 28.0
 
Jan. 13, 2020, 2 p.m. 35.1 ppb (32) 20.8 ppb (19) N/A 14.0 ppb (13) N/A N/A N/A 0.34 ppb (4) N/A N/A 32.0
 
Jan. 13, 2020, 1 p.m. 43.4 ppb (40) 27.3 ppb (25) N/A 16.0 ppb (15) N/A N/A N/A 0.32 ppb (4) N/A 4.0 μg/m3 (17) 40.0
 
Jan. 13, 2020, noon 47.9 ppb (44) 30.6 ppb (28) N/A 17.0 ppb (16) N/A N/A N/A 0.31 ppb (3) N/A 3.0 μg/m3 (12) 44.0
 
Jan. 13, 2020, 11 a.m. 52.2 ppb (48) 35.6 ppb (33) N/A 17.0 ppb (16) N/A N/A N/A 0.31 ppb (3) N/A 4.0 μg/m3 (17) 48.0
 
Jan. 13, 2020, 10 a.m. 50.3 ppb (47) 33.0 ppb (31) N/A 17.0 ppb (16) N/A N/A N/A 0.29 ppb (3) N/A 6.0 μg/m3 (25) 47.0
 
Jan. 13, 2020, 9 a.m. 30.5 ppb (28) 17.2 ppb (16) N/A 13.0 ppb (12) N/A N/A N/A 0.23 ppb (3) N/A 3.0 μg/m3 (12) 28.0
 
Jan. 13, 2020, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.23 ppb (3) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 13, 2020, 7 a.m. 19.1 ppb (18) 6.3 ppb (6) N/A 13.0 ppb (12) N/A N/A N/A 0.22 ppb (2) N/A 3.0 μg/m3 (12) 18.0
 
Jan. 13, 2020, 6 a.m. 14.1 ppb (13) 2.7 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A 0.2 ppb (2) N/A 3.0 μg/m3 (12) 13.0
 
Jan. 13, 2020, 5 a.m. 14.7 ppb (14) 2.9 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.21 ppb (2) N/A 3.0 μg/m3 (12) 14.0
 
Jan. 13, 2020, 4 a.m. 16.6 ppb (15) 4.7 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 15.0
 
Jan. 13, 2020, 3 a.m. 22.5 ppb (21) 9.6 ppb (9) N/A 13.0 ppb (12) N/A N/A N/A 0.35 ppb (4) N/A 4.0 μg/m3 (17) 21.0
 
Jan. 13, 2020, 2 a.m. 25.9 ppb (24) 11.7 ppb (11) N/A 14.0 ppb (13) N/A N/A N/A 0.34 ppb (4) N/A 5.0 μg/m3 (21) 24.0
 
Jan. 13, 2020, 1 a.m. 17.0 ppb (16) 4.7 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A 0.32 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 13, 2020, midnight 12.2 ppb (11) 2.2 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.28 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 12, 2020, 11 p.m. 12.4 ppb (11) 2.4 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.28 ppb (3) N/A 0.0 μg/m3 (0) 11.0
 
Jan. 12, 2020, 10 p.m. 9.4 ppb (9) 1.9 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.26 ppb (3) N/A 1.0 μg/m3 (4) 9.0
 
Jan. 12, 2020, 9 p.m. 7.7 ppb (7) 1.1 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 12, 2020, 8 p.m. 6.5 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 1.0 μg/m3 (4) 6.0
 
Jan. 12, 2020, 7 p.m. 6.2 ppb (6) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.23 ppb (3) N/A 0.0 μg/m3 (0) 6.0
 
Jan. 12, 2020, 6 p.m. 6.4 ppb (6) 0.9 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 1.0 μg/m3 (4) 6.0
 
Jan. 12, 2020, 5 p.m. 7.3 ppb (7) 0.9 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 1.0 μg/m3 (4) 7.0
 
Jan. 12, 2020, 4 p.m. 9.6 ppb (9) 2.1 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 1.0 μg/m3 (4) 9.0
 
Jan. 12, 2020, 3 p.m. 9.5 ppb (9) 1.8 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 2.0 μg/m3 (8) 9.0
 
Jan. 12, 2020, 2 p.m. 10.4 ppb (10) 2.4 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.22 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 12, 2020, 1 p.m. 10.8 ppb (10) 2.9 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 2.0 μg/m3 (8) 10.0
 
Jan. 12, 2020, noon 13.5 ppb (12) 3.9 ppb (4) N/A 10.0 ppb (9) N/A N/A N/A 0.22 ppb (2) N/A 2.0 μg/m3 (8) 12.0
 
Jan. 12, 2020, 11 a.m. 12.5 ppb (12) 3.1 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 2.0 μg/m3 (8) 12.0
 
Jan. 12, 2020, 10 a.m. 12.8 ppb (12) 2.9 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.23 ppb (3) N/A 1.0 μg/m3 (4) 12.0
 
Jan. 12, 2020, 9 a.m. 12.0 ppb (11) 3.1 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 0.0 μg/m3 (0) 11.0
 
Jan. 12, 2020, 8 a.m. 12.1 ppb (11) 2.8 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.21 ppb (2) N/A -2.0 μg/m3 (0) 11.0
 
Jan. 12, 2020, 7 a.m. 12.8 ppb (12) 3.0 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.22 ppb (2) N/A 0.0 μg/m3 (0) 12.0
 
Jan. 12, 2020, 6 a.m. 12.9 ppb (12) 2.8 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.22 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 12, 2020, 5 a.m. 13.6 ppb (13) 2.9 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 12, 2020, 4 a.m. 15.2 ppb (14) 3.6 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 12, 2020, 3 a.m. 14.9 ppb (14) 3.6 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A 0.19 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 12, 2020, 2 a.m. 16.2 ppb (15) 4.0 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A 0.22 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 12, 2020, 1 a.m. 18.6 ppb (17) 5.0 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A 0.24 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 12, 2020, midnight 18.6 ppb (17) 4.7 ppb (4) N/A 14.0 ppb (13) N/A N/A N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 11, 2020, 11 p.m. 20.8 ppb (19) 5.6 ppb (5) N/A 15.0 ppb (14) N/A N/A N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 11, 2020, 10 p.m. 18.6 ppb (17) 4.6 ppb (4) N/A 14.0 ppb (13) N/A N/A N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 11, 2020, 9 p.m. 18.3 ppb (17) 4.3 ppb (4) N/A 14.0 ppb (13) N/A N/A N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 11, 2020, 8 p.m. 22.2 ppb (21) 5.6 ppb (5) N/A 17.0 ppb (16) N/A N/A N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 11, 2020, 7 p.m. 24.4 ppb (23) 6.7 ppb (6) N/A 18.0 ppb (17) N/A N/A N/A 0.26 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 11, 2020, 6 p.m. 26.8 ppb (25) 8.7 ppb (8) N/A 18.0 ppb (17) N/A N/A N/A 0.27 ppb (3) N/A 5.0 μg/m3 (21) 25.0
 
Jan. 11, 2020, 5 p.m. 33.4 ppb (31) 15.2 ppb (14) N/A 18.0 ppb (17) N/A N/A N/A 0.29 ppb (3) N/A 4.0 μg/m3 (17) 31.0
 
Jan. 11, 2020, 4 p.m. 42.5 ppb (39) 25.2 ppb (23) N/A 17.0 ppb (16) N/A N/A N/A 0.31 ppb (3) N/A 6.0 μg/m3 (25) 39.0
 
Jan. 11, 2020, 3 p.m. 53.0 ppb (49) 36.0 ppb (33) N/A 17.0 ppb (16) N/A N/A N/A 0.33 ppb (4) N/A 4.0 μg/m3 (17) 49.0
 
Jan. 11, 2020, 2 p.m. 68.6 ppb (66) 50.0 ppb (46) N/A 19.0 ppb (18) N/A N/A N/A 0.38 ppb (4) N/A 7.0 μg/m3 (29) 66.0
 
Jan. 11, 2020, 1 p.m. 101.0 ppb (100) 81.0 ppb (79) N/A 20.0 ppb (19) N/A N/A N/A 0.44 ppb (5) N/A 10.0 μg/m3 (42) 100.0
 
Jan. 11, 2020, noon 103.5 ppb (100) 83.9 ppb (82) N/A 20.0 ppb (19) N/A N/A N/A 0.43 ppb (5) N/A 10.0 μg/m3 (42) 100.0
 
Jan. 11, 2020, 11 a.m. 110.7 ppb (102) 90.9 ppb (89) N/A 20.0 ppb (19) N/A N/A N/A 0.43 ppb (5) N/A 22.0 μg/m3 (71) 102.0
 
Jan. 11, 2020, 10 a.m. 84.3 ppb (82) 66.7 ppb (64) N/A 18.0 ppb (17) N/A N/A N/A 0.4 ppb (4) N/A 12.0 μg/m3 (50) 82.0
 
Jan. 11, 2020, 9 a.m. 92.0 ppb (90) 72.8 ppb (70) N/A 19.0 ppb (18) N/A N/A N/A 0.44 ppb (5) N/A 11.0 μg/m3 (46) 90.0
 
Jan. 11, 2020, 8 a.m. 79.1 ppb (77) 61.4 ppb (58) N/A 18.0 ppb (17) N/A N/A N/A 0.42 ppb (5) N/A 6.0 μg/m3 (25) 77.0
 
Jan. 11, 2020, 7 a.m. 69.4 ppb (66) 51.0 ppb (47) N/A 18.0 ppb (17) N/A N/A N/A 0.42 ppb (5) N/A 8.0 μg/m3 (33) 66.0
 
Jan. 11, 2020, 6 a.m. 77.4 ppb (75) 57.8 ppb (54) N/A 20.0 ppb (19) N/A N/A N/A 0.43 ppb (5) N/A 10.0 μg/m3 (42) 75.0
 
Jan. 11, 2020, 5 a.m. 70.4 ppb (67) 50.5 ppb (47) N/A 20.0 ppb (19) N/A N/A N/A 0.44 ppb (5) N/A 18.0 μg/m3 (63) 67.0
 
Jan. 11, 2020, 4 a.m. 71.1 ppb (68) 49.8 ppb (46) N/A 21.0 ppb (19) N/A N/A N/A N/A N/A 15.0 μg/m3 (56) 68.0
 
Jan. 11, 2020, 3 a.m. 72.6 ppb (70) 50.0 ppb (46) N/A 23.0 ppb (21) N/A N/A N/A 0.44 ppb (5) N/A 19.0 μg/m3 (65) 70.0
 
Jan. 11, 2020, 2 a.m. 62.6 ppb (59) 40.4 ppb (37) N/A 22.0 ppb (20) N/A N/A N/A 0.43 ppb (5) N/A 7.0 μg/m3 (29) 59.0
 
Jan. 11, 2020, 1 a.m. 57.1 ppb (53) 34.1 ppb (32) N/A 23.0 ppb (21) N/A N/A N/A 0.38 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 11, 2020, midnight 49.2 ppb (46) 26.1 ppb (24) 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
 
Jan. 10, 2020, 11 p.m. 51.1 ppb (47) 26.0 ppb (24) N/A 25.0 ppb (23) N/A N/A N/A 0.39 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 10, 2020, 10 p.m. 47.5 ppb (44) 22.1 ppb (20) N/A 25.0 ppb (23) N/A N/A N/A 0.4 ppb (4) N/A 7.0 μg/m3 (29) 44.0
 
Jan. 10, 2020, 9 p.m. 48.8 ppb (45) 23.7 ppb (22) N/A 25.0 ppb (23) N/A N/A N/A 0.4 ppb (4) N/A 6.0 μg/m3 (25) 45.0
 
Jan. 10, 2020, 8 p.m. 46.7 ppb (43) 23.2 ppb (21) N/A 23.0 ppb (21) N/A N/A N/A 0.36 ppb (4) N/A 7.0 μg/m3 (29) 43.0
 
Jan. 10, 2020, 7 p.m. 50.8 ppb (47) 27.4 ppb (25) N/A 23.0 ppb (21) N/A N/A N/A 0.36 ppb (4) N/A 6.0 μg/m3 (25) 47.0
 
Jan. 10, 2020, 6 p.m. 52.6 ppb (49) 28.4 ppb (26) N/A 24.0 ppb (22) N/A N/A N/A 0.35 ppb (4) N/A 6.0 μg/m3 (25) 49.0
 
Jan. 10, 2020, 5 p.m. 58.1 ppb (54) 33.7 ppb (31) N/A 24.0 ppb (22) N/A N/A N/A 0.36 ppb (4) N/A 8.0 μg/m3 (33) 54.0
 
Jan. 10, 2020, 4 p.m. 62.0 ppb (59) 37.0 ppb (34) N/A 25.0 ppb (23) N/A N/A N/A 0.39 ppb (4) N/A 6.0 μg/m3 (25) 59.0
 
Jan. 10, 2020, 3 p.m. 67.3 ppb (64) 41.3 ppb (38) N/A 26.0 ppb (24) N/A N/A N/A 0.43 ppb (5) N/A 8.0 μg/m3 (33) 64.0
 
Jan. 10, 2020, 2 p.m. 72.2 ppb (69) 45.7 ppb (42) N/A 26.0 ppb (24) N/A N/A N/A 0.45 ppb (5) N/A 6.0 μg/m3 (25) 69.0
 
Jan. 10, 2020, 1 p.m. 76.9 ppb (74) 49.6 ppb (46) N/A 27.0 ppb (25) N/A N/A N/A 0.46 ppb (5) N/A 7.0 μg/m3 (29) 74.0
 
Jan. 10, 2020, noon 71.8 ppb (69) 45.1 ppb (42) N/A 27.0 ppb (25) N/A N/A N/A 0.43 ppb (5) N/A 8.0 μg/m3 (33) 69.0
 
Jan. 10, 2020, 11 a.m. 71.1 ppb (68) 44.8 ppb (41) N/A 26.0 ppb (24) N/A N/A N/A 0.39 ppb (4) N/A 7.0 μg/m3 (29) 68.0
 
Jan. 10, 2020, 10 a.m. 61.6 ppb (58) 35.6 ppb (33) N/A 26.0 ppb (24) N/A N/A N/A 0.3 ppb (3) N/A 6.0 μg/m3 (25) 58.0
 
Jan. 10, 2020, 9 a.m. 56.6 ppb (53) 30.6 ppb (28) N/A 26.0 ppb (24) N/A N/A N/A 0.24 ppb (3) N/A 7.0 μg/m3 (29) 53.0
 
Jan. 10, 2020, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 10, 2020, 7 a.m. 43.6 ppb (40) 20.5 ppb (19) N/A 23.0 ppb (21) N/A N/A N/A 0.19 ppb (2) N/A 2.0 μg/m3 (8) 40.0
 
Jan. 10, 2020, 6 a.m. 39.3 ppb (36) 16.8 ppb (16) N/A 23.0 ppb (21) N/A N/A N/A 0.2 ppb (2) N/A 2.0 μg/m3 (8) 36.0
 
Jan. 10, 2020, 5 a.m. 37.3 ppb (35) 15.7 ppb (15) N/A 22.0 ppb (20) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 35.0
 
Jan. 10, 2020, 4 a.m. 36.3 ppb (34) 15.5 ppb (14) N/A 21.0 ppb (19) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 34.0
 
Jan. 10, 2020, 3 a.m. 48.5 ppb (45) 25.3 ppb (23) N/A 23.0 ppb (21) N/A N/A N/A 0.31 ppb (3) N/A 7.0 μg/m3 (29) 45.0
 
Jan. 10, 2020, 2 a.m. 53.3 ppb (49) 28.2 ppb (26) N/A 25.0 ppb (23) N/A N/A N/A 0.32 ppb (4) N/A 7.0 μg/m3 (29) 49.0
 
Jan. 10, 2020, 1 a.m. 49.5 ppb (46) 24.0 ppb (22) N/A 25.0 ppb (23) N/A N/A N/A 0.33 ppb (4) N/A 5.0 μg/m3 (21) 46.0
 
Jan. 10, 2020, midnight 45.3 ppb (42) 21.1 ppb (20) N/A 24.0 ppb (22) N/A N/A N/A 0.34 ppb (4) N/A 3.0 μg/m3 (12) 42.0