AQSQID: 240270006

Site Name: Howard County Near Road

Location: Laurel (I 95), MD

Reporting: True, Located: True

Current AQI: 42.0

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
Feb. 17, 2020, 10 p.m. 32.5 ppb (30) 10.9 ppb (10) N/A 22.0 ppb (20) N/A N/A N/A 0.33 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 17, 2020, 9 p.m. 30.3 ppb (28) 9.8 ppb (9) N/A 20.0 ppb (19) N/A N/A N/A 0.3 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 17, 2020, 8 p.m. 30.4 ppb (28) 11.0 ppb (10) N/A 19.0 ppb (18) N/A N/A N/A 0.29 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Feb. 17, 2020, 7 p.m. 28.5 ppb (26) 10.1 ppb (9) N/A 18.0 ppb (17) N/A N/A N/A 0.28 ppb (3) N/A 6.0 μg/m3 (25) 26.0
 
Feb. 17, 2020, 6 p.m. 22.8 ppb (21) 6.4 ppb (6) N/A 16.0 ppb (15) N/A N/A N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 21.0
 
Feb. 17, 2020, 5 p.m. 24.1 ppb (22) 8.0 ppb (7) N/A 16.0 ppb (15) N/A N/A N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 22.0
 
Feb. 17, 2020, 4 p.m. 24.2 ppb (22) 8.9 ppb (8) N/A 15.0 ppb (14) N/A N/A N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 22.0
 
Feb. 17, 2020, 3 p.m. 26.6 ppb (25) 11.9 ppb (11) N/A 15.0 ppb (14) N/A N/A N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Feb. 17, 2020, 2 p.m. 30.4 ppb (28) 15.4 ppb (14) N/A 15.0 ppb (14) N/A N/A N/A 0.28 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
Feb. 17, 2020, 1 p.m. 45.8 ppb (42) 29.4 ppb (27) N/A 16.0 ppb (15) N/A N/A N/A 0.32 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
Feb. 17, 2020, noon 43.0 ppb (40) 26.7 ppb (25) N/A 16.0 ppb (15) N/A N/A N/A 0.32 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
Feb. 17, 2020, 11 a.m. 35.9 ppb (33) 20.1 ppb (19) N/A 16.0 ppb (15) N/A N/A N/A 0.3 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
Feb. 17, 2020, 10 a.m. 40.4 ppb (37) 21.9 ppb (20) N/A 19.0 ppb (18) N/A N/A N/A 0.33 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
Feb. 17, 2020, 9 a.m. 35.8 ppb (33) 17.1 ppb (16) N/A 19.0 ppb (18) N/A N/A N/A 0.33 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
Feb. 17, 2020, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.34 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
Feb. 17, 2020, 7 a.m. 25.7 ppb (24) 7.5 ppb (7) N/A 18.0 ppb (17) N/A N/A N/A 0.34 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
Feb. 17, 2020, 6 a.m. 27.8 ppb (26) 9.1 ppb (8) N/A 19.0 ppb (18) N/A N/A N/A 0.36 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
Feb. 17, 2020, 5 a.m. 27.9 ppb (26) 9.5 ppb (9) N/A 18.0 ppb (17) N/A N/A N/A 0.35 ppb (4) N/A 16.0 μg/m3 (59) 59.0
 
Feb. 17, 2020, 4 a.m. 25.8 ppb (24) 8.2 ppb (8) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Feb. 17, 2020, 3 a.m. 30.5 ppb (28) 10.6 ppb (10) N/A 20.0 ppb (19) N/A N/A N/A 0.32 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
Feb. 17, 2020, 2 a.m. 29.4 ppb (27) 8.6 ppb (8) N/A 21.0 ppb (19) N/A N/A N/A 0.31 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
Feb. 17, 2020, 1 a.m. 21.6 ppb (20) 2.6 ppb (2) N/A 19.0 ppb (18) N/A N/A N/A 0.3 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Feb. 17, 2020, midnight 33.0 ppb (31) 9.4 ppb (9) N/A 24.0 ppb (22) N/A N/A N/A 0.38 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 16, 2020, 11 p.m. 33.8 ppb (31) 9.8 ppb (9) N/A 24.0 ppb (22) N/A N/A N/A 0.39 ppb (4) N/A 7.0 μg/m3 (29) 31.0
 
Feb. 16, 2020, 10 p.m. 26.8 ppb (25) 5.8 ppb (5) N/A 21.0 ppb (19) N/A N/A N/A 0.37 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Feb. 16, 2020, 9 p.m. 25.5 ppb (24) 6.1 ppb (6) N/A 19.0 ppb (18) N/A N/A N/A 0.35 ppb (4) N/A 5.0 μg/m3 (21) 24.0
 
Feb. 16, 2020, 8 p.m. 25.3 ppb (23) 7.5 ppb (7) N/A 18.0 ppb (17) N/A N/A N/A 0.34 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 16, 2020, 7 p.m. 26.9 ppb (25) 8.4 ppb (8) N/A 19.0 ppb (18) N/A N/A N/A 0.33 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 16, 2020, 6 p.m. 28.9 ppb (27) 11.2 ppb (10) N/A 18.0 ppb (17) N/A N/A N/A 0.36 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Feb. 16, 2020, 5 p.m. 31.0 ppb (29) 12.6 ppb (12) N/A 18.0 ppb (17) N/A N/A N/A 0.36 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Feb. 16, 2020, 4 p.m. 28.1 ppb (26) 9.9 ppb (9) N/A 18.0 ppb (17) N/A N/A N/A 0.33 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Feb. 16, 2020, 3 p.m. 28.8 ppb (27) 10.2 ppb (9) N/A 19.0 ppb (18) N/A N/A N/A 0.34 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 16, 2020, 2 p.m. 38.0 ppb (35) 17.4 ppb (16) N/A 21.0 ppb (19) N/A N/A N/A 0.38 ppb (4) N/A 8.0 μg/m3 (33) 35.0
 
Feb. 16, 2020, 1 p.m. 52.2 ppb (48) 28.7 ppb (27) N/A 23.0 ppb (21) N/A N/A N/A 0.38 ppb (4) N/A 11.0 μg/m3 (46) 48.0
 
Feb. 16, 2020, noon 59.0 ppb (55) 33.9 ppb (31) N/A 25.0 ppb (23) N/A N/A N/A 0.38 ppb (4) N/A 8.0 μg/m3 (33) 55.0
 
Feb. 16, 2020, 11 a.m. 56.4 ppb (53) 29.7 ppb (28) N/A 27.0 ppb (25) N/A N/A N/A 0.34 ppb (4) N/A 8.0 μg/m3 (33) 53.0
 
Feb. 16, 2020, 10 a.m. 49.0 ppb (45) 23.3 ppb (22) N/A 26.0 ppb (24) N/A N/A N/A 0.29 ppb (3) N/A 7.0 μg/m3 (29) 45.0
 
Feb. 16, 2020, 9 a.m. 51.8 ppb (48) 24.4 ppb (23) N/A 27.0 ppb (25) N/A N/A N/A 0.28 ppb (3) N/A 8.0 μg/m3 (33) 48.0
 
Feb. 16, 2020, 8 a.m. 38.2 ppb (35) 11.1 ppb (10) N/A 27.0 ppb (25) N/A N/A N/A 0.27 ppb (3) N/A 6.0 μg/m3 (25) 35.0
 
Feb. 16, 2020, 7 a.m. 34.5 ppb (32) 9.3 ppb (9) N/A 25.0 ppb (23) N/A N/A N/A 0.31 ppb (3) N/A 6.0 μg/m3 (25) 32.0
 
Feb. 16, 2020, 6 a.m. 38.2 ppb (35) 12.1 ppb (11) N/A 26.0 ppb (24) N/A N/A N/A 0.33 ppb (4) N/A 6.0 μg/m3 (25) 35.0
 
Feb. 16, 2020, 5 a.m. 33.1 ppb (31) 8.7 ppb (8) N/A 24.0 ppb (22) N/A N/A N/A 0.31 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 16, 2020, 4 a.m. 29.3 ppb (27) 6.1 ppb (6) N/A 23.0 ppb (21) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Feb. 16, 2020, 3 a.m. 32.9 ppb (30) 9.5 ppb (9) N/A 23.0 ppb (21) N/A N/A N/A 0.32 ppb (4) N/A 7.0 μg/m3 (29) 30.0
 
Feb. 16, 2020, 2 a.m. 36.5 ppb (34) 11.4 ppb (11) N/A 25.0 ppb (23) N/A N/A N/A 0.35 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 16, 2020, 1 a.m. 32.4 ppb (30) 9.2 ppb (9) N/A 23.0 ppb (21) N/A N/A N/A 0.36 ppb (4) N/A 6.0 μg/m3 (25) 30.0
 
Feb. 16, 2020, midnight 28.5 ppb (26) 8.2 ppb (8) N/A 20.0 ppb (19) N/A N/A N/A 0.32 ppb (4) N/A 5.0 μg/m3 (21) 26.0
 
Feb. 15, 2020, 11 p.m. 26.3 ppb (24) 6.9 ppb (6) N/A 19.0 ppb (18) N/A N/A N/A 0.31 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 15, 2020, 10 p.m. 24.9 ppb (23) 7.7 ppb (7) N/A 17.0 ppb (16) N/A N/A N/A 0.3 ppb (3) N/A 3.0 μg/m3 (12) 23.0
 
Feb. 15, 2020, 9 p.m. 19.9 ppb (18) 5.4 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A 0.27 ppb (3) N/A 4.0 μg/m3 (17) 18.0
 
Feb. 15, 2020, 8 p.m. 21.1 ppb (20) 6.0 ppb (6) N/A 15.0 ppb (14) N/A N/A N/A 0.29 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 15, 2020, 7 p.m. 20.8 ppb (19) 6.1 ppb (6) N/A 15.0 ppb (14) N/A N/A N/A 0.27 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 15, 2020, 6 p.m. 22.1 ppb (20) 7.5 ppb (7) N/A 15.0 ppb (14) N/A N/A N/A 0.28 ppb (3) N/A 3.0 μg/m3 (12) 20.0
 
Feb. 15, 2020, 5 p.m. 21.6 ppb (20) 6.9 ppb (6) N/A 15.0 ppb (14) N/A N/A N/A 0.27 ppb (3) N/A 2.0 μg/m3 (8) 20.0
 
Feb. 15, 2020, 4 p.m. 22.5 ppb (21) 7.1 ppb (7) N/A 15.0 ppb (14) N/A N/A N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 15, 2020, 3 p.m. 26.6 ppb (25) 9.4 ppb (9) N/A 17.0 ppb (16) N/A N/A N/A 0.28 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 15, 2020, 2 p.m. 33.5 ppb (31) 13.7 ppb (13) N/A 20.0 ppb (19) N/A N/A N/A 0.3 ppb (3) N/A 7.0 μg/m3 (29) 31.0
 
Feb. 15, 2020, 1 p.m. 44.0 ppb (41) 20.9 ppb (19) N/A 23.0 ppb (21) N/A N/A N/A 0.32 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 15, 2020, noon 55.0 ppb (51) 29.2 ppb (27) N/A 26.0 ppb (24) N/A N/A N/A 0.34 ppb (4) N/A 9.0 μg/m3 (38) 51.0
 
Feb. 15, 2020, 11 a.m. 57.5 ppb (54) 28.8 ppb (27) N/A 29.0 ppb (27) N/A N/A N/A 0.29 ppb (3) N/A 6.0 μg/m3 (25) 54.0
 
Feb. 15, 2020, 10 a.m. 46.2 ppb (43) 19.9 ppb (18) N/A 26.0 ppb (24) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 43.0
 
Feb. 15, 2020, 9 a.m. 41.1 ppb (38) 16.9 ppb (16) N/A 24.0 ppb (22) N/A N/A N/A 0.2 ppb (2) N/A 7.0 μg/m3 (29) 38.0
 
Feb. 15, 2020, 8 a.m. 36.0 ppb (33) 13.7 ppb (13) N/A 22.0 ppb (20) N/A N/A N/A 0.2 ppb (2) N/A 7.0 μg/m3 (29) 33.0
 
Feb. 15, 2020, 7 a.m. 17.4 ppb (16) 5.1 ppb (5) N/A 12.0 ppb (11) N/A N/A N/A 0.17 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Feb. 15, 2020, 6 a.m. 10.9 ppb (10) 1.4 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.16 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Feb. 15, 2020, 5 a.m. 14.4 ppb (13) 1.8 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A 0.16 ppb (2) N/A 3.0 μg/m3 (12) 13.0
 
Feb. 15, 2020, 4 a.m. 19.5 ppb (18) 3.5 ppb (3) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 18.0
 
Feb. 15, 2020, 3 a.m. 16.2 ppb (15) 2.2 ppb (2) 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
 
Feb. 15, 2020, 2 a.m. 18.1 ppb (17) 3.4 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.24 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 15, 2020, 1 a.m. 12.5 ppb (12) 1.9 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Feb. 15, 2020, midnight 7.9 ppb (7) 1.2 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Feb. 14, 2020, 11 p.m. 5.8 ppb (5) 0.6 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Feb. 14, 2020, 10 p.m. 6.7 ppb (6) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Feb. 14, 2020, 9 p.m. 6.3 ppb (6) 1.1 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Feb. 14, 2020, 8 p.m. 5.5 ppb (5) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Feb. 14, 2020, 7 p.m. 5.3 ppb (5) 0.9 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Feb. 14, 2020, 6 p.m. 5.0 ppb (5) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Feb. 14, 2020, 5 p.m. 5.4 ppb (5) 0.6 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 14, 2020, 4 p.m. 6.0 ppb (6) 0.8 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.19 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Feb. 14, 2020, 3 p.m. 6.8 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Feb. 14, 2020, 2 p.m. 8.8 ppb (8) 1.6 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Feb. 14, 2020, 1 p.m. 11.5 ppb (11) 1.8 ppb (2) 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
 
Feb. 14, 2020, noon 15.2 ppb (14) 3.3 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.19 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 14, 2020, 11 a.m. 14.6 ppb (14) 2.2 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.19 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Feb. 14, 2020, 10 a.m. 20.2 ppb (19) 3.9 ppb (4) N/A 16.0 ppb (15) N/A N/A N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 14, 2020, 9 a.m. 36.1 ppb (33) 13.9 ppb (13) N/A 22.0 ppb (20) N/A N/A N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 33.0
 
Feb. 14, 2020, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.18 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Feb. 14, 2020, 7 a.m. 49.7 ppb (46) 24.7 ppb (23) N/A 25.0 ppb (23) N/A N/A N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 46.0
 
Feb. 14, 2020, 6 a.m. 24.5 ppb (23) 10.1 ppb (9) N/A 14.0 ppb (13) N/A N/A N/A 0.19 ppb (2) N/A 3.0 μg/m3 (12) 23.0
 
Feb. 14, 2020, 5 a.m. 11.4 ppb (11) 2.3 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.18 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Feb. 14, 2020, 4 a.m. 9.6 ppb (9) 1.7 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Feb. 14, 2020, 3 a.m. 11.3 ppb (10) 2.5 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.16 ppb (2) N/A 2.0 μg/m3 (8) 10.0
 
Feb. 14, 2020, 2 a.m. 9.5 ppb (9) 1.2 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.15 ppb (2) N/A 1.0 μg/m3 (4) 9.0
 
Feb. 14, 2020, 1 a.m. 10.0 ppb (9) 1.5 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.15 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Feb. 14, 2020, midnight 10.3 ppb (10) 1.4 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Feb. 13, 2020, 11 p.m. 10.7 ppb (10) 1.4 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 13, 2020, 10 p.m. 12.7 ppb (12) 2.7 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 12.0
 
Feb. 13, 2020, 9 p.m. 15.6 ppb (14) 5.4 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A 0.2 ppb (2) N/A 1.0 μg/m3 (4) 14.0
 
Feb. 13, 2020, 8 p.m. 19.4 ppb (18) 8.8 ppb (8) N/A 11.0 ppb (10) N/A N/A N/A 0.21 ppb (2) N/A 2.0 μg/m3 (8) 18.0
 
Feb. 13, 2020, 7 p.m. 25.9 ppb (24) 13.2 ppb (12) N/A 13.0 ppb (12) N/A N/A N/A 0.24 ppb (3) N/A 3.0 μg/m3 (12) 24.0
 
Feb. 13, 2020, 6 p.m. 27.4 ppb (25) 14.0 ppb (13) N/A 13.0 ppb (12) N/A N/A N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 25.0
 
Feb. 13, 2020, 5 p.m. 39.9 ppb (37) 22.4 ppb (21) N/A 18.0 ppb (17) N/A N/A N/A 0.28 ppb (3) N/A 4.0 μg/m3 (17) 37.0
 
Feb. 13, 2020, 4 p.m. 47.2 ppb (44) 28.1 ppb (26) N/A 19.0 ppb (18) N/A N/A N/A 0.29 ppb (3) N/A 5.0 μg/m3 (21) 44.0
 
Feb. 13, 2020, 3 p.m. 54.4 ppb (50) 34.1 ppb (32) N/A 20.0 ppb (19) N/A N/A N/A 0.31 ppb (3) N/A 5.0 μg/m3 (21) 50.0
 
Feb. 13, 2020, 2 p.m. 46.1 ppb (43) 25.4 ppb (24) N/A 21.0 ppb (19) N/A N/A N/A 0.3 ppb (3) N/A 7.0 μg/m3 (29) 43.0
 
Feb. 13, 2020, 1 p.m. 47.6 ppb (44) 26.3 ppb (24) N/A 21.0 ppb (19) N/A N/A N/A 0.32 ppb (4) N/A 7.0 μg/m3 (29) 44.0
 
Feb. 13, 2020, noon 56.2 ppb (52) 32.8 ppb (30) N/A 23.0 ppb (21) N/A N/A N/A 0.35 ppb (4) N/A 10.0 μg/m3 (42) 52.0
 
Feb. 13, 2020, 11 a.m. 54.5 ppb (51) 29.6 ppb (27) N/A 25.0 ppb (23) N/A N/A N/A 0.34 ppb (4) N/A 8.0 μg/m3 (33) 51.0
 
Feb. 13, 2020, 10 a.m. 49.4 ppb (46) 24.2 ppb (22) N/A 25.0 ppb (23) N/A N/A N/A 0.28 ppb (3) N/A 9.0 μg/m3 (38) 46.0
 
Feb. 13, 2020, 9 a.m. 40.5 ppb (38) 16.7 ppb (15) N/A 24.0 ppb (22) N/A N/A N/A 0.24 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 13, 2020, 8 a.m. 30.8 ppb (29) 10.3 ppb (10) N/A 20.0 ppb (19) N/A N/A N/A 0.21 ppb (2) N/A 5.0 μg/m3 (21) 29.0
 
Feb. 13, 2020, 7 a.m. 27.4 ppb (25) 8.7 ppb (8) N/A 19.0 ppb (18) N/A N/A N/A 0.21 ppb (2) N/A 3.0 μg/m3 (12) 25.0
 
Feb. 13, 2020, 6 a.m. 23.1 ppb (21) 6.0 ppb (6) N/A 17.0 ppb (16) N/A N/A N/A 0.22 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 13, 2020, 5 a.m. 21.3 ppb (20) 5.4 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A 0.23 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Feb. 13, 2020, 4 a.m. 23.4 ppb (22) 6.2 ppb (6) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Feb. 13, 2020, 3 a.m. 29.2 ppb (27) 10.9 ppb (10) N/A 18.0 ppb (17) N/A N/A N/A 0.34 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 13, 2020, 2 a.m. 33.4 ppb (31) 13.5 ppb (12) N/A 20.0 ppb (19) N/A N/A N/A 0.35 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 13, 2020, 1 a.m. 39.9 ppb (37) 17.7 ppb (16) N/A 22.0 ppb (20) N/A N/A N/A 0.39 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
Feb. 13, 2020, midnight 38.2 ppb (35) 16.9 ppb (16) N/A 21.0 ppb (19) N/A N/A N/A 0.41 ppb (5) N/A 14.0 μg/m3 (54) 54.0
 
Feb. 12, 2020, 11 p.m. 40.8 ppb (38) 18.0 ppb (17) N/A 23.0 ppb (21) N/A N/A N/A 0.41 ppb (5) N/A 14.0 μg/m3 (54) 54.0
 
Feb. 12, 2020, 10 p.m. 37.8 ppb (35) 17.4 ppb (16) N/A 20.0 ppb (19) N/A N/A N/A 0.41 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 12, 2020, 9 p.m. 38.8 ppb (36) 18.4 ppb (17) N/A 20.0 ppb (19) N/A N/A N/A 0.41 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 12, 2020, 8 p.m. 37.7 ppb (35) 18.1 ppb (17) N/A 20.0 ppb (19) N/A N/A N/A 0.39 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 12, 2020, 7 p.m. 32.0 ppb (30) 15.2 ppb (14) N/A 17.0 ppb (16) N/A N/A N/A 0.35 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 12, 2020, 6 p.m. 28.5 ppb (26) 12.1 ppb (11) N/A 16.0 ppb (15) N/A N/A N/A 0.33 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 12, 2020, 5 p.m. 24.6 ppb (23) 10.2 ppb (9) N/A 14.0 ppb (13) N/A N/A N/A 0.3 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 12, 2020, 4 p.m. 21.0 ppb (19) 8.6 ppb (8) N/A 12.0 ppb (11) N/A N/A N/A 0.28 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 12, 2020, 3 p.m. 13.1 ppb (12) 3.4 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.25 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 12, 2020, 2 p.m. 13.5 ppb (12) 2.4 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Feb. 12, 2020, 1 p.m. 18.5 ppb (17) 4.7 ppb (4) N/A 14.0 ppb (13) N/A N/A N/A 0.25 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 12, 2020, noon 16.9 ppb (16) 3.1 ppb (3) N/A 14.0 ppb (13) N/A N/A N/A 0.21 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 12, 2020, 11 a.m. 17.0 ppb (16) 3.3 ppb (3) 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
 
Feb. 12, 2020, 10 a.m. 18.1 ppb (17) 4.7 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.21 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 12, 2020, 9 a.m. 13.8 ppb (13) 2.9 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A 0.19 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 12, 2020, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 12, 2020, 7 a.m. 7.7 ppb (7) 0.8 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.16 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Feb. 12, 2020, 6 a.m. 9.5 ppb (9) 1.1 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.17 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Feb. 12, 2020, 5 a.m. 10.1 ppb (9) 1.3 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.17 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 12, 2020, 4 a.m. 10.8 ppb (10) 1.5 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.16 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Feb. 12, 2020, 3 a.m. 11.9 ppb (11) 1.4 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 11.0
 
Feb. 12, 2020, 2 a.m. 14.2 ppb (13) 2.8 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
 
Feb. 12, 2020, 1 a.m. 16.7 ppb (15) 5.2 ppb (5) N/A 11.0 ppb (10) N/A N/A N/A 0.22 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 12, 2020, midnight 18.3 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (11) N/A N/A N/A 0.23 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 11, 2020, 11 p.m. 18.0 ppb (17) 5.7 ppb (5) N/A 12.0 ppb (11) N/A N/A N/A 0.23 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 11, 2020, 10 p.m. 18.1 ppb (17) 6.3 ppb (6) 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
 
Feb. 11, 2020, 9 p.m. 21.3 ppb (20) 8.4 ppb (8) N/A 13.0 ppb (12) N/A N/A N/A 0.27 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 11, 2020, 8 p.m. 21.8 ppb (20) 9.5 ppb (9) N/A 12.0 ppb (11) N/A N/A N/A 0.24 ppb (3) N/A 3.0 μg/m3 (12) 20.0
 
Feb. 11, 2020, 7 p.m. 23.2 ppb (21) 11.4 ppb (11) N/A 12.0 ppb (11) N/A N/A N/A 0.25 ppb (3) N/A 2.0 μg/m3 (8) 21.0
 
Feb. 11, 2020, 6 p.m. 26.5 ppb (25) 13.8 ppb (13) N/A 13.0 ppb (12) N/A N/A N/A 0.26 ppb (3) N/A 2.0 μg/m3 (8) 25.0
 
Feb. 11, 2020, 5 p.m. 30.8 ppb (29) 16.5 ppb (15) N/A 14.0 ppb (13) N/A N/A N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 29.0
 
Feb. 11, 2020, 4 p.m. 35.0 ppb (32) 19.8 ppb (18) N/A 15.0 ppb (14) N/A N/A N/A 0.31 ppb (3) N/A 5.0 μg/m3 (21) 32.0
 
Feb. 11, 2020, 3 p.m. N/A N/A N/A N/A N/A N/A N/A 0.34 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
Feb. 11, 2020, 2 p.m. 50.9 ppb (47) 33.1 ppb (31) N/A 18.0 ppb (17) N/A N/A N/A 0.33 ppb (4) N/A 9.0 μg/m3 (38) 47.0
 
Feb. 11, 2020, 1 p.m. 47.4 ppb (44) 29.7 ppb (28) N/A 18.0 ppb (17) N/A N/A N/A 0.31 ppb (3) N/A 6.0 μg/m3 (25) 44.0
 
Feb. 11, 2020, noon 48.3 ppb (45) 29.8 ppb (28) N/A 18.0 ppb (17) N/A N/A N/A 0.28 ppb (3) N/A 7.0 μg/m3 (29) 45.0
 
Feb. 11, 2020, 11 a.m. 62.9 ppb (59) 41.5 ppb (38) N/A 21.0 ppb (19) N/A N/A N/A 0.31 ppb (3) N/A 7.0 μg/m3 (29) 59.0
 
Feb. 11, 2020, 10 a.m. 69.8 ppb (67) 45.0 ppb (42) N/A 25.0 ppb (23) N/A N/A N/A 0.32 ppb (4) N/A 7.0 μg/m3 (29) 67.0
 
Feb. 11, 2020, 9 a.m. 67.0 ppb (64) 41.7 ppb (39) N/A 25.0 ppb (23) N/A N/A N/A 0.29 ppb (3) N/A 16.0 μg/m3 (59) 64.0
 
Feb. 11, 2020, 8 a.m. 55.5 ppb (52) 32.6 ppb (30) N/A 23.0 ppb (21) N/A N/A N/A 0.26 ppb (3) N/A 8.0 μg/m3 (33) 52.0
 
Feb. 11, 2020, 7 a.m. 63.8 ppb (60) 39.3 ppb (36) N/A 25.0 ppb (23) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 60.0
 
Feb. 11, 2020, 6 a.m. 53.6 ppb (50) 29.7 ppb (28) N/A 24.0 ppb (22) N/A N/A N/A 0.3 ppb (3) N/A 16.0 μg/m3 (59) 59.0
 
Feb. 11, 2020, 5 a.m. 53.9 ppb (50) 29.5 ppb (27) N/A 24.0 ppb (22) N/A N/A N/A 0.31 ppb (3) N/A 11.0 μg/m3 (46) 50.0
 
Feb. 11, 2020, 4 a.m. 53.6 ppb (50) 28.9 ppb (27) N/A 25.0 ppb (23) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 50.0
 
Feb. 11, 2020, 3 a.m. 49.1 ppb (45) 24.6 ppb (23) N/A 24.0 ppb (22) N/A N/A N/A 0.36 ppb (4) N/A 10.0 μg/m3 (42) 45.0
 
Feb. 11, 2020, 2 a.m. 45.8 ppb (42) 21.1 ppb (20) N/A 25.0 ppb (23) N/A N/A N/A 0.35 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 11, 2020, 1 a.m. 42.5 ppb (39) 18.9 ppb (18) N/A 24.0 ppb (22) N/A N/A N/A 0.34 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 11, 2020, midnight 47.1 ppb (44) 22.3 ppb (21) N/A 25.0 ppb (23) N/A N/A N/A 0.42 ppb (5) N/A 6.0 μg/m3 (25) 44.0
 
Feb. 10, 2020, 11 p.m. 48.2 ppb (45) 23.0 ppb (21) N/A 25.0 ppb (23) N/A N/A N/A 0.42 ppb (5) N/A 15.0 μg/m3 (56) 56.0