AQSQID: 240270006

Site Name: Howard County Near Road

Location: Laurel (I 95), MD

Reporting: True, Located: True

Current AQI: 25.0

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
April 10, 2020, 1 a.m. 4.4 ppb (4) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.12 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
April 10, 2020, midnight 7.7 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.11 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
April 9, 2020, 11 p.m. 5.5 ppb (5) 1.3 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.1 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
April 9, 2020, 10 p.m. 3.5 ppb (3) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.1 ppb (1) N/A 1.0 μg/m3 (4) 4.0
 
April 9, 2020, 9 p.m. 3.3 ppb (3) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.1 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
April 9, 2020, 8 p.m. 2.8 ppb (3) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.1 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
April 9, 2020, 7 p.m. 3.3 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.1 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
April 9, 2020, 6 p.m. 3.3 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.09 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
April 9, 2020, 5 p.m. 2.5 ppb (2) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.1 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
April 9, 2020, 4 p.m. 5.7 ppb (5) 1.8 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.13 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
April 9, 2020, 3 p.m. 22.6 ppb (21) 11.4 ppb (11) N/A 11.0 ppb (10) N/A N/A N/A 0.22 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
April 9, 2020, 2 p.m. N/A N/A N/A N/A N/A N/A N/A 0.26 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
April 9, 2020, 1 p.m. 54.0 ppb (50) 31.5 ppb (29) N/A 22.0 ppb (20) N/A N/A N/A 0.27 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
April 9, 2020, noon 59.7 ppb (56) 33.6 ppb (31) N/A 26.0 ppb (24) N/A N/A N/A 0.36 ppb (4) N/A 18.0 μg/m3 (63) 63.0
 
April 9, 2020, 11 a.m. 51.2 ppb (47) 26.5 ppb (25) N/A 25.0 ppb (23) N/A N/A N/A 0.33 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
April 9, 2020, 10 a.m. 28.3 ppb (26) 11.1 ppb (10) N/A 17.0 ppb (16) N/A N/A N/A 0.25 ppb (3) N/A 17.0 μg/m3 (61) 61.0
 
April 9, 2020, 9 a.m. 42.8 ppb (40) 17.3 ppb (16) N/A 26.0 ppb (24) N/A N/A N/A 0.32 ppb (4) N/A 16.0 μg/m3 (59) 59.0
 
April 9, 2020, 8 a.m. 39.6 ppb (37) 14.8 ppb (14) N/A 25.0 ppb (23) N/A N/A N/A 0.28 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
April 9, 2020, 7 a.m. 46.5 ppb (43) 19.3 ppb (18) N/A 27.0 ppb (25) N/A N/A N/A 0.26 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
April 9, 2020, 6 a.m. 39.7 ppb (37) 14.3 ppb (13) N/A 25.0 ppb (23) N/A N/A N/A 0.28 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
April 9, 2020, 5 a.m. 39.9 ppb (37) 15.5 ppb (14) N/A 24.0 ppb (22) N/A N/A N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 37.0
 
April 9, 2020, 4 a.m. 28.3 ppb (26) 11.1 ppb (10) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
April 9, 2020, 3 a.m. 32.6 ppb (30) 12.6 ppb (12) N/A 20.0 ppb (19) N/A N/A N/A 0.3 ppb (3) N/A 4.0 μg/m3 (17) 30.0
 
April 9, 2020, 2 a.m. 35.6 ppb (33) 16.3 ppb (15) N/A 19.0 ppb (18) N/A N/A N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 33.0
 
April 9, 2020, 1 a.m. 20.1 ppb (19) 9.5 ppb (9) N/A 11.0 ppb (10) N/A N/A N/A 0.26 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
April 9, 2020, midnight 20.1 ppb (19) 8.3 ppb (8) N/A 12.0 ppb (11) N/A N/A N/A 0.27 ppb (3) N/A 3.0 μg/m3 (12) 19.0
 
April 8, 2020, 11 p.m. 12.4 ppb (11) 2.7 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.24 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
April 8, 2020, 10 p.m. 5.9 ppb (5) 1.4 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 8, 2020, 9 p.m. 3.5 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.22 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
April 8, 2020, 8 p.m. 5.5 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
April 8, 2020, 7 p.m. 2.8 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
April 8, 2020, 6 p.m. 2.9 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.21 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
April 8, 2020, 5 p.m. 3.5 ppb (3) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
April 8, 2020, 4 p.m. 2.9 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
April 8, 2020, 3 p.m. 5.2 ppb (5) 1.7 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (2) N/A 1.0 μg/m3 (4) 5.0
 
April 8, 2020, 2 p.m. 12.3 ppb (11) 5.4 ppb (5) N/A 7.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 0.0 μg/m3 (0) 11.0
 
April 8, 2020, 1 p.m. 23.2 ppb (21) 9.9 ppb (9) N/A 13.0 ppb (12) N/A N/A N/A 0.23 ppb (3) N/A 2.0 μg/m3 (8) 21.0
 
April 8, 2020, noon 29.4 ppb (27) 12.9 ppb (12) N/A 17.0 ppb (16) N/A N/A N/A 0.24 ppb (3) N/A 4.0 μg/m3 (17) 27.0
 
April 8, 2020, 11 a.m. 36.3 ppb (34) 16.8 ppb (16) N/A 20.0 ppb (19) N/A N/A N/A 0.26 ppb (3) N/A 3.0 μg/m3 (12) 34.0
 
April 8, 2020, 10 a.m. 42.6 ppb (39) 19.8 ppb (18) N/A 23.0 ppb (21) N/A N/A N/A 0.28 ppb (3) N/A 2.0 μg/m3 (8) 39.0
 
April 8, 2020, 9 a.m. 31.8 ppb (29) 12.2 ppb (11) N/A 20.0 ppb (19) N/A N/A N/A 0.27 ppb (3) N/A 4.0 μg/m3 (17) 29.0
 
April 8, 2020, 8 a.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
 
April 8, 2020, 7 a.m. 51.4 ppb (48) 31.7 ppb (29) N/A 20.0 ppb (19) N/A N/A N/A 0.23 ppb (3) N/A 16.0 μg/m3 (59) 59.0
 
April 8, 2020, 6 a.m. 38.8 ppb (36) 16.4 ppb (15) N/A 22.0 ppb (20) N/A N/A N/A 0.24 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
April 8, 2020, 5 a.m. 40.3 ppb (37) 17.0 ppb (16) N/A 23.0 ppb (21) N/A N/A N/A 0.23 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
April 8, 2020, 4 a.m. 43.3 ppb (40) 17.7 ppb (16) N/A 26.0 ppb (24) N/A N/A N/A 0.25 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
April 8, 2020, 3 a.m. 41.4 ppb (38) 16.8 ppb (16) N/A 25.0 ppb (23) N/A N/A N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 38.0
 
April 8, 2020, 2 a.m. 58.2 ppb (54) 29.1 ppb (27) N/A 29.0 ppb (27) N/A N/A N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 54.0
 
April 8, 2020, 1 a.m. 41.0 ppb (38) 15.5 ppb (14) N/A 25.0 ppb (23) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 38.0
 
April 8, 2020, midnight 48.2 ppb (45) 18.1 ppb (17) N/A 30.0 ppb (28) N/A N/A N/A 0.27 ppb (3) N/A 7.0 μg/m3 (29) 45.0
 
April 7, 2020, 11 p.m. 43.9 ppb (41) 17.7 ppb (16) N/A 26.0 ppb (24) N/A N/A N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 41.0
 
April 7, 2020, 10 p.m. 35.1 ppb (32) 13.8 ppb (13) N/A 21.0 ppb (19) N/A N/A N/A 0.28 ppb (3) N/A 7.0 μg/m3 (29) 32.0
 
April 7, 2020, 9 p.m. 37.6 ppb (35) 16.3 ppb (15) N/A 21.0 ppb (19) N/A N/A N/A 0.28 ppb (3) N/A 7.0 μg/m3 (29) 35.0
 
April 7, 2020, 8 p.m. 49.5 ppb (46) 23.2 ppb (21) N/A 26.0 ppb (24) N/A N/A N/A 0.34 ppb (4) N/A 9.0 μg/m3 (38) 46.0
 
April 7, 2020, 7 p.m. 10.4 ppb (10) 3.8 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
April 7, 2020, 6 p.m. 4.4 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.12 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
April 7, 2020, 5 p.m. 5.7 ppb (5) 1.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.12 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
April 7, 2020, 4 p.m. 10.6 ppb (10) 3.7 ppb (3) 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
 
April 7, 2020, 3 p.m. 25.8 ppb (24) 11.2 ppb (10) N/A 15.0 ppb (14) N/A N/A N/A 0.23 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
April 7, 2020, 2 p.m. 58.3 ppb (55) 33.7 ppb (31) N/A 25.0 ppb (23) N/A N/A N/A 0.33 ppb (4) N/A 14.0 μg/m3 (54) 55.0
 
April 7, 2020, 1 p.m. 70.9 ppb (68) 43.0 ppb (40) N/A 28.0 ppb (26) N/A N/A N/A 0.35 ppb (4) N/A 13.0 μg/m3 (52) 68.0
 
April 7, 2020, noon 87.8 ppb (86) 51.6 ppb (48) N/A 36.0 ppb (33) N/A N/A N/A 0.4 ppb (4) N/A 13.0 μg/m3 (52) 86.0
 
April 7, 2020, 11 a.m. 91.8 ppb (90) 54.1 ppb (50) N/A 38.0 ppb (35) N/A N/A N/A 0.43 ppb (5) N/A 13.0 μg/m3 (52) 90.0
 
April 7, 2020, 10 a.m. 94.9 ppb (94) 57.7 ppb (54) N/A 37.0 ppb (34) N/A N/A N/A 0.47 ppb (5) N/A 17.0 μg/m3 (61) 94.0
 
April 7, 2020, 9 a.m. 77.0 ppb (74) 41.4 ppb (38) N/A 36.0 ppb (33) N/A N/A N/A 0.43 ppb (5) N/A 12.0 μg/m3 (50) 74.0
 
April 7, 2020, 8 a.m. 80.1 ppb (78) 40.2 ppb (37) N/A 40.0 ppb (37) N/A N/A N/A 0.35 ppb (4) N/A 10.0 μg/m3 (42) 78.0
 
April 7, 2020, 7 a.m. 87.8 ppb (86) 47.6 ppb (44) N/A 40.0 ppb (37) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 86.0
 
April 7, 2020, 6 a.m. 55.7 ppb (52) 32.7 ppb (30) N/A 23.0 ppb (21) N/A N/A N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 52.0
 
April 7, 2020, 5 a.m. 33.9 ppb (31) 15.9 ppb (15) N/A 18.0 ppb (17) N/A N/A N/A 0.26 ppb (3) N/A 6.0 μg/m3 (25) 31.0
 
April 7, 2020, 4 a.m. 26.7 ppb (25) 8.5 ppb (8) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 7, 2020, 3 a.m. 24.4 ppb (23) 6.8 ppb (6) N/A 18.0 ppb (17) N/A N/A N/A 0.26 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
April 7, 2020, 2 a.m. 19.1 ppb (18) 6.8 ppb (6) N/A 12.0 ppb (11) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
April 7, 2020, 1 a.m. 29.4 ppb (27) 13.0 ppb (12) N/A 16.0 ppb (15) N/A N/A N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 27.0
 
April 7, 2020, midnight 20.6 ppb (19) 9.4 ppb (9) N/A 11.0 ppb (10) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 6, 2020, 11 p.m. 14.2 ppb (13) 3.1 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 6, 2020, 10 p.m. 10.4 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 10.0
 
April 6, 2020, 9 p.m. 8.2 ppb (8) 2.5 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
 
April 6, 2020, 8 p.m. 8.7 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 8.0
 
April 6, 2020, 7 p.m. 6.2 ppb (6) 2.5 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 6.0
 
April 6, 2020, 6 p.m. 5.9 ppb (5) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 5.0
 
April 6, 2020, 5 p.m. 6.1 ppb (6) 2.7 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
April 6, 2020, 4 p.m. 6.4 ppb (6) 2.6 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.16 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
April 6, 2020, 3 p.m. 7.5 ppb (7) 3.6 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
April 6, 2020, 2 p.m. 8.9 ppb (8) 4.2 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.18 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 6, 2020, 1 p.m. 7.9 ppb (7) 3.6 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 6, 2020, noon 9.2 ppb (9) 4.1 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.19 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
April 6, 2020, 11 a.m. 27.3 ppb (25) 11.5 ppb (11) N/A 16.0 ppb (15) N/A N/A N/A 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
April 6, 2020, 10 a.m. 38.6 ppb (36) 15.6 ppb (14) N/A 23.0 ppb (21) N/A N/A N/A 0.28 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
April 6, 2020, 9 a.m. 17.0 ppb (16) 7.3 ppb (7) N/A 10.0 ppb (9) N/A N/A N/A 0.21 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
April 6, 2020, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.18 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
April 6, 2020, 7 a.m. 9.7 ppb (9) 2.5 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 6, 2020, 6 a.m. 9.6 ppb (9) 2.2 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
April 6, 2020, 5 a.m. 21.7 ppb (20) 6.1 ppb (6) N/A 16.0 ppb (15) N/A N/A N/A 0.21 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
April 6, 2020, 4 a.m. 29.6 ppb (27) 10.6 ppb (10) N/A 19.0 ppb (18) N/A N/A N/A 0.22 ppb (2) N/A 4.0 μg/m3 (17) 27.0
 
April 6, 2020, 3 a.m. 31.4 ppb (29) 10.1 ppb (9) N/A 21.0 ppb (19) N/A N/A N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 29.0
 
April 6, 2020, 2 a.m. 26.5 ppb (25) 5.8 ppb (5) N/A 21.0 ppb (19) N/A N/A N/A 0.21 ppb (2) N/A 3.0 μg/m3 (12) 25.0
 
April 6, 2020, 1 a.m. 29.6 ppb (27) 11.8 ppb (11) N/A 18.0 ppb (17) N/A N/A N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 27.0
 
April 6, 2020, midnight 22.2 ppb (21) 8.8 ppb (8) N/A 13.0 ppb (12) N/A N/A N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
April 5, 2020, 11 p.m. 23.4 ppb (22) 10.5 ppb (10) N/A 13.0 ppb (12) N/A N/A N/A 0.31 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
April 5, 2020, 10 p.m. 22.3 ppb (21) 6.9 ppb (6) N/A 15.0 ppb (14) N/A N/A N/A 0.35 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
April 5, 2020, 9 p.m. 15.3 ppb (14) 6.0 ppb (6) N/A 9.0 ppb (8) N/A N/A N/A 0.25 ppb (3) N/A 3.0 μg/m3 (12) 14.0
 
April 5, 2020, 8 p.m. 12.6 ppb (12) 5.5 ppb (5) N/A 7.0 ppb (6) N/A N/A N/A 0.24 ppb (3) N/A 1.0 μg/m3 (4) 12.0
 
April 5, 2020, 7 p.m. 10.8 ppb (10) 4.6 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.24 ppb (3) N/A 0.0 μg/m3 (0) 10.0
 
April 5, 2020, 6 p.m. 11.3 ppb (10) 4.8 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.28 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
April 5, 2020, 5 p.m. 12.0 ppb (11) 5.1 ppb (5) N/A 7.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
April 5, 2020, 4 p.m. 12.7 ppb (12) 6.7 ppb (6) N/A 6.0 ppb (6) N/A N/A N/A 0.24 ppb (3) N/A 2.0 μg/m3 (8) 12.0
 
April 5, 2020, 3 p.m. 14.5 ppb (13) 7.3 ppb (7) N/A 7.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
April 5, 2020, 2 p.m. 15.3 ppb (14) 7.6 ppb (7) N/A 8.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
April 5, 2020, 1 p.m. 21.8 ppb (20) 11.1 ppb (10) N/A 11.0 ppb (10) N/A N/A N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
April 5, 2020, noon 19.2 ppb (18) 7.7 ppb (7) N/A 12.0 ppb (11) N/A N/A N/A 0.27 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
April 5, 2020, 11 a.m. 36.5 ppb (34) 17.7 ppb (16) N/A 19.0 ppb (18) N/A N/A N/A 0.3 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
April 5, 2020, 10 a.m. 42.4 ppb (39) 19.7 ppb (18) N/A 23.0 ppb (21) N/A N/A N/A 0.32 ppb (4) N/A 7.0 μg/m3 (29) 39.0
 
April 5, 2020, 9 a.m. 42.8 ppb (40) 22.9 ppb (21) N/A 20.0 ppb (19) N/A N/A N/A 0.26 ppb (3) N/A 7.0 μg/m3 (29) 40.0
 
April 5, 2020, 8 a.m. 23.2 ppb (21) 8.4 ppb (8) N/A 15.0 ppb (14) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 5, 2020, 7 a.m. 27.3 ppb (25) 8.9 ppb (8) N/A 18.0 ppb (17) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 5, 2020, 6 a.m. 13.6 ppb (13) 3.2 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.18 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
April 5, 2020, 5 a.m. 22.2 ppb (21) 7.0 ppb (6) N/A 15.0 ppb (14) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 5, 2020, 4 a.m. 22.6 ppb (21) 7.2 ppb (7) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
April 5, 2020, 3 a.m. 24.0 ppb (22) 8.3 ppb (8) N/A 16.0 ppb (15) N/A N/A N/A 0.17 ppb (2) N/A 4.0 μg/m3 (17) 22.0
 
April 5, 2020, 2 a.m. 20.8 ppb (19) 8.4 ppb (8) N/A 12.0 ppb (11) N/A N/A N/A 0.22 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
April 5, 2020, 1 a.m. 19.3 ppb (18) 8.4 ppb (8) N/A 11.0 ppb (10) N/A N/A N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
April 5, 2020, midnight 20.1 ppb (19) 8.4 ppb (8) N/A 12.0 ppb (11) N/A N/A N/A 0.32 ppb (4) N/A 4.0 μg/m3 (17) 19.0
 
April 4, 2020, 11 p.m. 21.0 ppb (19) 9.0 ppb (8) N/A 12.0 ppb (11) N/A N/A N/A 0.3 ppb (3) N/A 3.0 μg/m3 (12) 19.0
 
April 4, 2020, 10 p.m. 22.8 ppb (21) 11.2 ppb (10) N/A 12.0 ppb (11) N/A N/A N/A 0.29 ppb (3) N/A 4.0 μg/m3 (17) 21.0
 
April 4, 2020, 9 p.m. 13.0 ppb (12) 5.8 ppb (5) N/A 7.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 2.0 μg/m3 (8) 12.0
 
April 4, 2020, 8 p.m. 12.5 ppb (12) 5.6 ppb (5) N/A 7.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 0.0 μg/m3 (0) 12.0
 
April 4, 2020, 7 p.m. 10.1 ppb (9) 4.1 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.19 ppb (2) N/A 1.0 μg/m3 (4) 9.0
 
April 4, 2020, 6 p.m. 8.2 ppb (8) 3.6 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
April 4, 2020, 5 p.m. 7.5 ppb (7) 3.3 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (2) N/A 0.0 μg/m3 (0) 7.0
 
April 4, 2020, 4 p.m. 8.3 ppb (8) 4.1 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (2) N/A 1.0 μg/m3 (4) 8.0
 
April 4, 2020, 3 p.m. 10.9 ppb (10) 5.1 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A 0.18 ppb (2) N/A -2.0 μg/m3 (0) 10.0
 
April 4, 2020, 2 p.m. 5.4 ppb (5) 2.3 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.15 ppb (2) N/A -2.0 μg/m3 (0) 5.0
 
April 4, 2020, 1 p.m. 5.4 ppb (5) 2.2 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.14 ppb (2) N/A 1.0 μg/m3 (4) 5.0
 
April 4, 2020, noon 6.9 ppb (6) 2.4 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.15 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
April 4, 2020, 11 a.m. 10.3 ppb (10) 3.6 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A 0.15 ppb (2) N/A -1.0 μg/m3 (0) 10.0
 
April 4, 2020, 10 a.m. 11.3 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A 0.14 ppb (2) N/A 1.0 μg/m3 (4) 10.0
 
April 4, 2020, 9 a.m. 9.3 ppb (9) 2.8 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.14 ppb (2) N/A 1.0 μg/m3 (4) 9.0
 
April 4, 2020, 8 a.m. 15.0 ppb (14) 5.1 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A 0.14 ppb (2) N/A 0.0 μg/m3 (0) 14.0
 
April 4, 2020, 7 a.m. 13.7 ppb (13) 4.1 ppb (4) N/A 10.0 ppb (9) N/A N/A N/A 0.14 ppb (2) N/A 0.0 μg/m3 (0) 13.0
 
April 4, 2020, 6 a.m. 12.9 ppb (12) 3.6 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.14 ppb (2) N/A -2.0 μg/m3 (0) 12.0
 
April 4, 2020, 5 a.m. 11.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.14 ppb (2) N/A 0.0 μg/m3 (0) 10.0
 
April 4, 2020, 4 a.m. 7.7 ppb (7) 2.1 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 7.0
 
April 4, 2020, 3 a.m. 8.2 ppb (8) 2.3 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.14 ppb (2) N/A -2.0 μg/m3 (0) 8.0
 
April 4, 2020, 2 a.m. 5.3 ppb (5) 1.9 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.14 ppb (2) N/A -1.0 μg/m3 (0) 5.0
 
April 4, 2020, 1 a.m. 9.3 ppb (9) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.16 ppb (2) N/A 1.0 μg/m3 (4) 9.0
 
April 4, 2020, midnight 5.5 ppb (5) 1.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.15 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
April 3, 2020, 11 p.m. 5.1 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
April 3, 2020, 10 p.m. 5.7 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.16 ppb (2) N/A 0.0 μg/m3 (0) 5.0
 
April 3, 2020, 9 p.m. 4.3 ppb (4) 1.5 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (2) N/A -1.0 μg/m3 (0) 4.0
 
April 3, 2020, 8 p.m. 3.1 ppb (3) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 0.0 μg/m3 (0) 3.0
 
April 3, 2020, 7 p.m. 3.7 ppb (3) 1.1 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.14 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
April 3, 2020, 6 p.m. 2.5 ppb (2) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
April 3, 2020, 5 p.m. 2.9 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.13 ppb (1) N/A 1.0 μg/m3 (4) 4.0
 
April 3, 2020, 4 p.m. 2.6 ppb (2) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.13 ppb (1) N/A 1.0 μg/m3 (4) 4.0
 
April 3, 2020, 3 p.m. 3.4 ppb (3) 1.2 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
April 3, 2020, 2 p.m. 3.0 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
April 3, 2020, 1 p.m. 3.9 ppb (4) 1.4 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
April 3, 2020, noon 3.2 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.13 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
April 3, 2020, 11 a.m. 4.9 ppb (5) 1.3 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.14 ppb (2) N/A 1.0 μg/m3 (4) 5.0
 
April 3, 2020, 10 a.m. 4.9 ppb (5) 1.2 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.14 ppb (2) N/A 0.0 μg/m3 (0) 5.0
 
April 3, 2020, 9 a.m. 12.8 ppb (12) 6.5 ppb (6) N/A 6.0 ppb (6) N/A N/A N/A 0.14 ppb (2) N/A 0.0 μg/m3 (0) 12.0
 
April 3, 2020, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.14 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
April 3, 2020, 7 a.m. 15.5 ppb (14) 7.2 ppb (7) N/A 8.0 ppb (7) N/A N/A N/A 0.14 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
April 3, 2020, 6 a.m. 14.1 ppb (13) 7.0 ppb (6) N/A 7.0 ppb (6) N/A N/A N/A 0.14 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
April 3, 2020, 5 a.m. 11.4 ppb (11) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A 0.14 ppb (2) N/A 2.0 μg/m3 (8) 11.0
 
April 3, 2020, 4 a.m. 9.9 ppb (9) 4.3 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 9.0
 
April 3, 2020, 3 a.m. 11.9 ppb (11) 5.0 ppb (5) N/A 7.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 11.0
 
April 3, 2020, 2 a.m. 6.8 ppb (6) 2.1 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.17 ppb (2) N/A -1.0 μg/m3 (0) 6.0