ID: 2375

AQSQID: 240270006

Site Name: Howard County Near Road

Added: April 21, 2020, 6:24 p.m.

Updated: June 23, 2021, 4:51 p.m.

Location: Laurel (I 95), MD

Reporting: True, Located: True

Current AQI: 18.0

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
June 23, 2021, 4 p.m. 23.6 ppb (23) 12.7 ppb (12) N/A 11.0 ppb (11) N/A N/A N/A 0.21 ppb (3) N/A 1.0 μg/m3 (5) 23.0
 
June 23, 2021, 3 p.m. 18.7 ppb (18) 9.2 ppb (9) N/A 10.0 ppb (10) N/A N/A N/A 0.17 ppb (3) N/A 2.0 μg/m3 (9) 18.0
 
June 23, 2021, 2 p.m. 14.2 ppb (14) 6.4 ppb (7) N/A 8.0 ppb (8) N/A N/A N/A 0.16 ppb (3) N/A 1.0 μg/m3 (5) 14.0
 
June 23, 2021, 1 p.m. 22.8 ppb (22) 11.8 ppb (12) N/A 11.0 ppb (11) N/A N/A N/A 0.2 ppb (3) N/A 3.0 μg/m3 (13) 22.0
 
June 23, 2021, noon 17.7 ppb (17) 9.1 ppb (9) N/A 9.0 ppb (9) N/A N/A N/A 0.19 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
June 23, 2021, 11 a.m. 29.4 ppb (28) 18.0 ppb (17) N/A 11.0 ppb (11) N/A N/A N/A 0.23 ppb (3) N/A 2.0 μg/m3 (9) 28.0
 
June 23, 2021, 10 a.m. 41.1 ppb (39) 28.5 ppb (27) N/A 13.0 ppb (13) N/A N/A N/A 0.28 ppb (4) N/A 2.0 μg/m3 (9) 39.0
 
June 23, 2021, 9 a.m. 42.1 ppb (40) 30.6 ppb (29) N/A 12.0 ppb (12) N/A N/A N/A 0.28 ppb (4) N/A 3.0 μg/m3 (13) 40.0
 
June 23, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.19 ppb (3) N/A 3.0 μg/m3 (13) 13.0
 
June 23, 2021, 7 a.m. 32.3 ppb (31) 22.3 ppb (22) N/A 10.0 ppb (10) N/A N/A N/A 0.14 ppb (2) N/A 4.0 μg/m3 (17) 31.0
 
June 23, 2021, 6 a.m. 32.6 ppb (31) 21.2 ppb (20) N/A 11.0 ppb (11) N/A N/A N/A 0.17 ppb (3) N/A 4.0 μg/m3 (17) 31.0
 
June 23, 2021, 5 a.m. 36.6 ppb (35) 23.9 ppb (23) N/A 13.0 ppb (13) N/A N/A N/A 0.2 ppb (3) N/A 5.0 μg/m3 (21) 35.0
 
June 23, 2021, 4 a.m. 48.5 ppb (46) 34.7 ppb (33) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 46.0
 
June 23, 2021, 3 a.m. 16.6 ppb (16) 9.6 ppb (10) N/A 7.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
June 23, 2021, 2 a.m. 19.2 ppb (19) 9.8 ppb (10) N/A 9.0 ppb (9) N/A N/A N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
June 23, 2021, 1 a.m. 16.3 ppb (16) 7.8 ppb (8) N/A 8.0 ppb (8) N/A N/A N/A 0.22 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
June 23, 2021, midnight 21.1 ppb (20) 9.0 ppb (9) N/A 12.0 ppb (12) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
June 22, 2021, 11 p.m. 13.3 ppb (13) 5.8 ppb (6) N/A 7.0 ppb (7) N/A N/A N/A 0.21 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
June 22, 2021, 10 p.m. 14.2 ppb (14) 6.2 ppb (6) N/A 8.0 ppb (8) N/A N/A N/A 0.21 ppb (3) N/A 3.0 μg/m3 (13) 14.0
 
June 22, 2021, 9 p.m. 15.3 ppb (15) 6.7 ppb (7) N/A 9.0 ppb (9) N/A N/A N/A 0.21 ppb (3) N/A 3.0 μg/m3 (13) 15.0
 
June 22, 2021, 8 p.m. 14.8 ppb (14) 6.5 ppb (7) N/A 8.0 ppb (8) N/A N/A N/A 0.19 ppb (3) N/A 3.0 μg/m3 (13) 14.0
 
June 22, 2021, 7 p.m. 20.0 ppb (19) 9.7 ppb (10) N/A 10.0 ppb (10) N/A N/A N/A 0.22 ppb (3) N/A 1.0 μg/m3 (5) 19.0
 
June 22, 2021, 6 p.m. 19.2 ppb (19) 9.9 ppb (10) N/A 9.0 ppb (9) N/A N/A N/A 0.24 ppb (3) N/A 1.0 μg/m3 (5) 19.0
 
June 22, 2021, 5 p.m. 20.2 ppb (20) 10.2 ppb (10) N/A 10.0 ppb (10) N/A N/A N/A 0.24 ppb (3) N/A 1.0 μg/m3 (5) 20.0
 
June 22, 2021, 4 p.m. 34.0 ppb (33) 17.8 ppb (17) N/A 16.0 ppb (16) N/A N/A N/A 0.23 ppb (3) N/A 3.0 μg/m3 (13) 33.0
 
June 22, 2021, 3 p.m. 24.2 ppb (23) 11.1 ppb (11) N/A 13.0 ppb (13) N/A N/A N/A 0.2 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
June 22, 2021, 2 p.m. 22.5 ppb (22) 9.7 ppb (10) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
June 22, 2021, 1 p.m. 22.9 ppb (22) 8.6 ppb (9) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
June 22, 2021, noon 36.7 ppb (35) 21.0 ppb (20) N/A 16.0 ppb (16) N/A N/A N/A 0.26 ppb (4) N/A 5.0 μg/m3 (21) 35.0
 
June 22, 2021, 11 a.m. 66.3 ppb (65) 49.8 ppb (47) N/A 16.0 ppb (16) N/A N/A N/A 0.39 ppb (5) N/A 5.0 μg/m3 (21) 65.0
 
June 22, 2021, 10 a.m. 62.3 ppb (60) 47.6 ppb (45) N/A 15.0 ppb (15) N/A N/A N/A 0.4 ppb (5) N/A 6.0 μg/m3 (25) 60.0
 
June 22, 2021, 9 a.m. 86.1 ppb (86) 68.5 ppb (67) N/A 17.0 ppb (17) N/A N/A N/A 0.44 ppb (5) N/A 6.0 μg/m3 (25) 86.0
 
June 22, 2021, 8 a.m. 77.6 ppb (77) 59.8 ppb (58) N/A 18.0 ppb (17) N/A N/A N/A 0.34 ppb (4) N/A 5.0 μg/m3 (21) 77.0
 
June 22, 2021, 7 a.m. 45.0 ppb (43) 27.9 ppb (27) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 43.0
 
June 22, 2021, 6 a.m. 52.8 ppb (50) 32.5 ppb (31) N/A 20.0 ppb (19) N/A N/A N/A 0.27 ppb (4) N/A 3.0 μg/m3 (13) 50.0
 
June 22, 2021, 5 a.m. 40.2 ppb (38) 18.0 ppb (17) N/A 22.0 ppb (21) N/A N/A N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 38.0
 
June 22, 2021, 4 a.m. 49.7 ppb (47) 26.5 ppb (25) N/A 23.0 ppb (22) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 47.0
 
June 22, 2021, 3 a.m. 30.5 ppb (29) 12.9 ppb (13) N/A 18.0 ppb (17) N/A N/A N/A 0.18 ppb (3) N/A 5.0 μg/m3 (21) 29.0
 
June 22, 2021, 2 a.m. 37.0 ppb (35) 17.3 ppb (17) N/A 20.0 ppb (19) N/A N/A N/A 0.29 ppb (4) N/A 5.0 μg/m3 (21) 35.0
 
June 22, 2021, 1 a.m. 56.8 ppb (54) 30.7 ppb (29) N/A 26.0 ppb (25) N/A N/A N/A 0.37 ppb (5) N/A 6.0 μg/m3 (25) 54.0
 
June 22, 2021, midnight 36.8 ppb (35) 14.9 ppb (15) N/A 22.0 ppb (21) N/A N/A N/A 0.29 ppb (4) N/A 6.0 μg/m3 (25) 35.0
 
June 21, 2021, 11 p.m. 31.3 ppb (30) 11.9 ppb (12) N/A 19.0 ppb (18) N/A N/A N/A 0.28 ppb (4) N/A 6.0 μg/m3 (25) 30.0
 
June 21, 2021, 10 p.m. 18.1 ppb (18) 6.7 ppb (7) N/A 12.0 ppb (12) N/A N/A N/A 0.19 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
June 21, 2021, 9 p.m. 42.1 ppb (40) 17.9 ppb (17) N/A 24.0 ppb (23) N/A N/A N/A 0.33 ppb (4) N/A 8.0 μg/m3 (34) 40.0
 
June 21, 2021, 8 p.m. 40.5 ppb (39) 19.6 ppb (19) N/A 21.0 ppb (20) N/A N/A N/A 0.37 ppb (5) N/A 8.0 μg/m3 (34) 39.0
 
June 21, 2021, 7 p.m. 31.5 ppb (30) 13.1 ppb (13) 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
 
June 21, 2021, 6 p.m. 27.1 ppb (26) 10.5 ppb (10) N/A 17.0 ppb (17) N/A N/A N/A 0.33 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
June 21, 2021, 5 p.m. 27.2 ppb (26) 12.0 ppb (12) N/A 15.0 ppb (15) N/A N/A N/A 0.31 ppb (4) N/A 13.0 μg/m3 (53) 53.0
 
June 21, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A N/A 0.32 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
June 21, 2021, 3 p.m. 36.3 ppb (35) 17.0 ppb (17) N/A 19.0 ppb (18) N/A N/A N/A 0.29 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
June 21, 2021, 2 p.m. 39.4 ppb (38) 20.8 ppb (20) N/A 19.0 ppb (18) N/A N/A N/A 0.28 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
June 21, 2021, 1 p.m. 33.8 ppb (32) 18.9 ppb (18) N/A 15.0 ppb (15) N/A N/A N/A 0.29 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
June 21, 2021, noon 31.9 ppb (31) 19.6 ppb (19) N/A 12.0 ppb (12) N/A N/A N/A 0.31 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
June 21, 2021, 11 a.m. 42.2 ppb (40) 28.1 ppb (27) N/A 14.0 ppb (14) N/A N/A N/A 0.34 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
June 21, 2021, 10 a.m. 56.6 ppb (54) 39.0 ppb (37) N/A 18.0 ppb (17) N/A N/A N/A 0.41 ppb (5) N/A 8.0 μg/m3 (34) 54.0
 
June 21, 2021, 9 a.m. 55.8 ppb (53) 37.7 ppb (36) N/A 18.0 ppb (17) N/A N/A N/A 0.42 ppb (5) N/A 9.0 μg/m3 (38) 53.0
 
June 21, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.3 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
June 21, 2021, 7 a.m. 41.4 ppb (40) 23.4 ppb (23) N/A 18.0 ppb (17) N/A N/A N/A 0.22 ppb (3) N/A 7.0 μg/m3 (30) 40.0
 
June 21, 2021, 6 a.m. 40.0 ppb (38) 21.5 ppb (21) N/A 19.0 ppb (18) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 38.0
 
June 21, 2021, 5 a.m. 26.7 ppb (26) 12.4 ppb (12) N/A 14.0 ppb (14) N/A N/A N/A 0.23 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
June 21, 2021, 4 a.m. 30.6 ppb (29) 15.5 ppb (15) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 29.0
 
June 21, 2021, 3 a.m. 35.8 ppb (34) 18.8 ppb (18) N/A 17.0 ppb (17) N/A N/A N/A 0.3 ppb (4) N/A 7.0 μg/m3 (30) 34.0
 
June 21, 2021, 2 a.m. 32.1 ppb (31) 15.4 ppb (15) N/A 17.0 ppb (17) N/A N/A N/A 0.37 ppb (5) N/A 7.0 μg/m3 (30) 31.0
 
June 21, 2021, 1 a.m. 31.0 ppb (30) 13.7 ppb (13) N/A 17.0 ppb (17) N/A N/A N/A 0.39 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
June 21, 2021, midnight 26.1 ppb (25) 9.6 ppb (10) N/A 17.0 ppb (17) N/A N/A N/A 0.35 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
June 20, 2021, 11 p.m. 19.6 ppb (19) 7.3 ppb (7) N/A 12.0 ppb (12) N/A N/A N/A 0.38 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
June 20, 2021, 10 p.m. 18.5 ppb (18) 7.2 ppb (7) N/A 11.0 ppb (11) N/A N/A N/A 0.34 ppb (4) N/A 13.0 μg/m3 (53) 53.0
 
June 20, 2021, 9 p.m. 20.3 ppb (20) 7.1 ppb (7) N/A 13.0 ppb (13) N/A N/A N/A 0.35 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
June 20, 2021, 8 p.m. 14.0 ppb (14) 3.1 ppb (3) N/A 11.0 ppb (11) N/A N/A N/A 0.33 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
June 20, 2021, 7 p.m. 15.1 ppb (15) 4.2 ppb (4) N/A 11.0 ppb (11) N/A N/A N/A 0.34 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
June 20, 2021, 6 p.m. 6.2 ppb (6) 1.2 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.24 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
June 20, 2021, 5 p.m. 5.3 ppb (5) 1.1 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.25 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
June 20, 2021, 4 p.m. 13.6 ppb (13) 4.1 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A 0.33 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
June 20, 2021, 3 p.m. 15.6 ppb (15) 4.8 ppb (5) N/A 11.0 ppb (11) N/A N/A N/A 0.34 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
June 20, 2021, 2 p.m. 17.7 ppb (17) 5.8 ppb (6) N/A 12.0 ppb (12) N/A N/A N/A 0.36 ppb (5) N/A 8.0 μg/m3 (34) 34.0
 
June 20, 2021, 1 p.m. 18.8 ppb (18) 6.3 ppb (6) N/A 12.0 ppb (12) N/A N/A N/A 0.4 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
June 20, 2021, noon 24.8 ppb (24) 9.0 ppb (9) N/A 16.0 ppb (16) N/A N/A N/A 0.46 ppb (6) N/A 10.0 μg/m3 (42) 42.0
 
June 20, 2021, 11 a.m. 53.3 ppb (51) 33.6 ppb (32) N/A 20.0 ppb (19) N/A N/A N/A 0.53 ppb (6) N/A 12.0 μg/m3 (50) 51.0
 
June 20, 2021, 10 a.m. 42.3 ppb (40) 30.4 ppb (29) N/A 12.0 ppb (12) N/A N/A N/A 0.37 ppb (5) N/A 8.0 μg/m3 (34) 40.0
 
June 20, 2021, 9 a.m. 28.9 ppb (28) 17.2 ppb (17) N/A 12.0 ppb (12) N/A N/A N/A 0.34 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
June 20, 2021, 8 a.m. 37.7 ppb (36) 23.8 ppb (23) N/A 14.0 ppb (14) N/A N/A N/A 0.31 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
June 20, 2021, 7 a.m. 56.1 ppb (54) 36.9 ppb (35) N/A 19.0 ppb (18) N/A N/A N/A 0.43 ppb (5) N/A 10.0 μg/m3 (42) 54.0
 
June 20, 2021, 6 a.m. 48.2 ppb (46) 27.6 ppb (27) N/A 21.0 ppb (20) N/A N/A N/A 0.32 ppb (4) N/A 8.0 μg/m3 (34) 46.0
 
June 20, 2021, 5 a.m. 53.4 ppb (51) 27.8 ppb (27) N/A 26.0 ppb (25) N/A N/A N/A 0.43 ppb (5) N/A 6.0 μg/m3 (25) 51.0
 
June 20, 2021, 4 a.m. 33.9 ppb (32) 14.3 ppb (14) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 32.0
 
June 20, 2021, 3 a.m. 34.1 ppb (33) 9.7 ppb (10) N/A 24.0 ppb (23) N/A N/A N/A 0.38 ppb (5) N/A 5.0 μg/m3 (21) 33.0
 
June 20, 2021, 2 a.m. 27.0 ppb (26) 10.4 ppb (10) N/A 17.0 ppb (17) N/A N/A N/A 0.32 ppb (4) N/A 4.0 μg/m3 (17) 26.0
 
June 20, 2021, 1 a.m. 13.6 ppb (13) 3.0 ppb (3) N/A 11.0 ppb (11) N/A N/A N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
June 20, 2021, midnight 11.1 ppb (11) 2.5 ppb (3) N/A 9.0 ppb (9) N/A N/A N/A 0.28 ppb (4) N/A 2.0 μg/m3 (9) 11.0
 
June 19, 2021, 11 p.m. 13.4 ppb (13) 2.8 ppb (3) N/A 11.0 ppb (11) N/A N/A N/A 0.29 ppb (4) N/A 1.0 μg/m3 (5) 13.0
 
June 19, 2021, 10 p.m. 9.6 ppb (10) 2.4 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
June 19, 2021, 9 p.m. 9.1 ppb (9) 1.8 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
June 19, 2021, 8 p.m. 8.7 ppb (9) 2.1 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.21 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
June 19, 2021, 7 p.m. 8.6 ppb (9) 1.9 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
June 19, 2021, 6 p.m. 14.5 ppb (14) 3.9 ppb (4) N/A 11.0 ppb (11) N/A N/A N/A 0.3 ppb (4) N/A 14.0 μg/m3 (55) 55.0
 
June 19, 2021, 5 p.m. 14.2 ppb (14) 3.6 ppb (4) N/A 11.0 ppb (11) N/A N/A N/A 0.28 ppb (4) N/A 13.0 μg/m3 (53) 53.0
 
June 19, 2021, 4 p.m. 15.2 ppb (15) 4.0 ppb (4) N/A 11.0 ppb (11) N/A N/A N/A 0.33 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
June 19, 2021, 3 p.m. 16.9 ppb (16) 5.0 ppb (5) N/A 12.0 ppb (12) N/A N/A N/A 0.35 ppb (4) N/A 14.0 μg/m3 (55) 55.0
 
June 19, 2021, 2 p.m. 29.6 ppb (28) 11.8 ppb (12) N/A 18.0 ppb (17) N/A N/A N/A 0.42 ppb (5) N/A 14.0 μg/m3 (55) 55.0
 
June 19, 2021, 1 p.m. 30.4 ppb (29) 9.4 ppb (9) N/A 21.0 ppb (20) N/A N/A N/A 0.36 ppb (5) N/A 13.0 μg/m3 (53) 53.0
 
June 19, 2021, noon 28.3 ppb (27) 7.0 ppb (7) N/A 21.0 ppb (20) N/A N/A N/A 0.32 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
June 19, 2021, 11 a.m. 37.9 ppb (36) 11.4 ppb (11) N/A 27.0 ppb (26) N/A N/A N/A 0.36 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
June 19, 2021, 10 a.m. 42.8 ppb (41) 12.4 ppb (12) N/A 30.0 ppb (29) N/A N/A N/A 0.34 ppb (4) N/A 9.0 μg/m3 (38) 41.0
 
June 19, 2021, 9 a.m. 37.3 ppb (36) 10.8 ppb (11) N/A 27.0 ppb (26) N/A N/A N/A 0.32 ppb (4) N/A 13.0 μg/m3 (53) 53.0
 
June 19, 2021, 8 a.m. 49.2 ppb (47) 16.7 ppb (16) N/A 32.0 ppb (31) N/A N/A N/A 0.29 ppb (4) N/A 10.0 μg/m3 (42) 47.0
 
June 19, 2021, 7 a.m. 42.2 ppb (40) 11.8 ppb (12) N/A 30.0 ppb (29) N/A N/A N/A 0.26 ppb (4) N/A 9.0 μg/m3 (38) 40.0
 
June 19, 2021, 6 a.m. 39.3 ppb (38) 10.5 ppb (10) N/A 29.0 ppb (28) N/A N/A N/A 0.28 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
June 19, 2021, 5 a.m. 42.3 ppb (40) 12.3 ppb (12) N/A 30.0 ppb (29) N/A N/A N/A 0.27 ppb (4) N/A 9.0 μg/m3 (38) 40.0
 
June 19, 2021, 4 a.m. 43.7 ppb (42) 13.6 ppb (13) N/A 30.0 ppb (29) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
June 19, 2021, 3 a.m. 45.1 ppb (43) 14.1 ppb (14) N/A 31.0 ppb (30) N/A N/A N/A 0.34 ppb (4) N/A 8.0 μg/m3 (34) 43.0
 
June 19, 2021, 2 a.m. 54.5 ppb (52) 21.4 ppb (21) N/A 33.0 ppb (32) N/A N/A N/A 0.35 ppb (4) N/A 11.0 μg/m3 (46) 52.0
 
June 19, 2021, 1 a.m. 53.9 ppb (51) 17.9 ppb (17) N/A 36.0 ppb (34) N/A N/A N/A 0.39 ppb (5) N/A 14.0 μg/m3 (55) 55.0
 
June 19, 2021, midnight 50.9 ppb (49) 15.0 ppb (15) N/A 36.0 ppb (34) N/A N/A N/A 0.4 ppb (5) N/A 14.0 μg/m3 (55) 55.0
 
June 18, 2021, 11 p.m. 50.7 ppb (48) 16.6 ppb (16) N/A 34.0 ppb (33) N/A N/A N/A 0.41 ppb (5) N/A 11.0 μg/m3 (46) 48.0
 
June 18, 2021, 10 p.m. 40.7 ppb (39) 14.9 ppb (15) N/A 26.0 ppb (25) N/A N/A N/A 0.25 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
June 18, 2021, 9 p.m. 30.8 ppb (30) 11.1 ppb (11) N/A 20.0 ppb (19) N/A N/A N/A 0.22 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
June 18, 2021, 8 p.m. 24.0 ppb (23) 7.9 ppb (8) N/A 16.0 ppb (16) N/A N/A N/A 0.19 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
June 18, 2021, 7 p.m. 15.3 ppb (15) 5.4 ppb (6) N/A 10.0 ppb (10) N/A N/A N/A 0.13 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
June 18, 2021, 6 p.m. 26.0 ppb (25) 7.5 ppb (8) N/A 19.0 ppb (18) N/A N/A N/A 0.21 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
June 18, 2021, 5 p.m. 29.6 ppb (28) 10.1 ppb (10) N/A 19.0 ppb (18) N/A N/A N/A 0.22 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
June 18, 2021, 4 p.m. 31.5 ppb (30) 11.4 ppb (11) N/A 20.0 ppb (19) N/A N/A N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 30.0
 
June 18, 2021, 3 p.m. 34.6 ppb (33) 14.0 ppb (14) N/A 21.0 ppb (20) N/A N/A N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 33.0
 
June 18, 2021, 2 p.m. 46.1 ppb (44) 19.3 ppb (19) N/A 27.0 ppb (26) N/A N/A N/A 0.28 ppb (4) N/A 6.0 μg/m3 (25) 44.0
 
June 18, 2021, 1 p.m. 48.9 ppb (47) 22.2 ppb (21) N/A 27.0 ppb (26) N/A N/A N/A 0.29 ppb (4) N/A 8.0 μg/m3 (34) 47.0
 
June 18, 2021, noon 81.7 ppb (81) 48.5 ppb (46) N/A 33.0 ppb (32) N/A N/A N/A 0.58 ppb (7) N/A 13.0 μg/m3 (53) 81.0
 
June 18, 2021, 11 a.m. 117.2 ppb (105) 86.5 ppb (86) N/A 31.0 ppb (30) N/A N/A N/A 0.59 ppb (7) N/A 11.0 μg/m3 (46) 105.0
 
June 18, 2021, 10 a.m. 57.7 ppb (55) 36.8 ppb (35) N/A 21.0 ppb (20) N/A N/A N/A 0.28 ppb (4) N/A 5.0 μg/m3 (21) 55.0
 
June 18, 2021, 9 a.m. 35.4 ppb (34) 18.2 ppb (18) N/A 17.0 ppb (17) N/A N/A N/A 0.21 ppb (3) N/A 6.0 μg/m3 (25) 34.0
 
June 18, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.26 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
June 18, 2021, 7 a.m. 97.3 ppb (98) 69.4 ppb (68) N/A 28.0 ppb (27) N/A N/A N/A 0.27 ppb (4) N/A 9.0 μg/m3 (38) 98.0
 
June 18, 2021, 6 a.m. 69.1 ppb (68) 44.2 ppb (42) N/A 25.0 ppb (24) N/A N/A N/A 0.31 ppb (4) N/A 10.0 μg/m3 (42) 68.0
 
June 18, 2021, 5 a.m. 41.9 ppb (40) 21.4 ppb (21) N/A 20.0 ppb (19) N/A N/A N/A 0.25 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
June 18, 2021, 4 a.m. 37.1 ppb (35) 17.3 ppb (17) N/A 20.0 ppb (19) N/A N/A N/A 0.26 ppb (4) N/A 6.0 μg/m3 (25) 35.0
 
June 18, 2021, 3 a.m. 52.5 ppb (50) 23.6 ppb (23) N/A 29.0 ppb (28) N/A N/A N/A 0.32 ppb (4) N/A 7.0 μg/m3 (30) 50.0
 
June 18, 2021, 2 a.m. 64.7 ppb (63) 33.1 ppb (32) N/A 32.0 ppb (31) N/A N/A N/A 0.28 ppb (4) N/A 6.0 μg/m3 (25) 63.0
 
June 18, 2021, 1 a.m. 29.5 ppb (28) 9.5 ppb (9) N/A 20.0 ppb (19) N/A N/A N/A 0.19 ppb (3) N/A 0.0 μg/m3 (0) 28.0
 
June 18, 2021, midnight 12.8 ppb (13) 3.2 ppb (4) N/A 10.0 ppb (10) N/A N/A N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
June 17, 2021, 11 p.m. 15.7 ppb (15) 5.0 ppb (5) N/A 11.0 ppb (11) N/A N/A N/A 0.15 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
June 17, 2021, 10 p.m. 22.1 ppb (21) 8.3 ppb (8) N/A 14.0 ppb (14) N/A N/A N/A 0.14 ppb (2) N/A 0.0 μg/m3 (0) 21.0
 
June 17, 2021, 9 p.m. 16.5 ppb (16) 5.1 ppb (5) N/A 11.0 ppb (11) N/A N/A N/A 0.15 ppb (2) N/A 0.0 μg/m3 (0) 16.0
 
June 17, 2021, 8 p.m. 14.7 ppb (14) 5.2 ppb (5) N/A 9.0 ppb (9) N/A N/A N/A 0.15 ppb (2) N/A 1.0 μg/m3 (5) 14.0
 
June 17, 2021, 7 p.m. 6.0 ppb (6) 1.9 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.12 ppb (2) N/A 1.0 μg/m3 (5) 6.0
 
June 17, 2021, 6 p.m. 10.2 ppb (10) 3.8 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.14 ppb (2) N/A 3.0 μg/m3 (13) 13.0
 
June 17, 2021, 5 p.m. 8.8 ppb (9) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.13 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
June 17, 2021, 4 p.m. 10.2 ppb (10) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.13 ppb (2) N/A 1.0 μg/m3 (5) 10.0
 
June 17, 2021, 3 p.m. 10.7 ppb (11) 4.0 ppb (4) N/A 7.0 ppb (7) N/A N/A N/A 0.12 ppb (2) N/A 0.0 μg/m3 (0) 11.0
 
June 17, 2021, 2 p.m. 18.2 ppb (18) 8.2 ppb (8) N/A 10.0 ppb (10) N/A N/A N/A 0.15 ppb (2) N/A 0.0 μg/m3 (0) 18.0
 
June 17, 2021, 1 p.m. 13.9 ppb (14) 5.1 ppb (5) N/A 9.0 ppb (9) N/A N/A N/A 0.13 ppb (2) N/A 1.0 μg/m3 (5) 14.0
 
June 17, 2021, noon 13.5 ppb (13) 4.6 ppb (5) N/A 9.0 ppb (9) N/A N/A N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
June 17, 2021, 11 a.m. 27.3 ppb (26) 12.5 ppb (12) N/A 15.0 ppb (15) N/A N/A N/A 0.18 ppb (3) N/A 4.0 μg/m3 (17) 26.0
 
June 17, 2021, 10 a.m. 46.2 ppb (44) 24.1 ppb (23) N/A 22.0 ppb (21) N/A N/A N/A 0.24 ppb (3) N/A 5.0 μg/m3 (21) 44.0
 
June 17, 2021, 9 a.m. 49.8 ppb (47) 26.3 ppb (25) N/A 23.0 ppb (22) N/A N/A N/A 0.22 ppb (3) N/A 7.0 μg/m3 (30) 47.0
 
June 17, 2021, 8 a.m. 47.4 ppb (45) 22.5 ppb (22) N/A 25.0 ppb (24) N/A N/A N/A 0.16 ppb (3) N/A 6.0 μg/m3 (25) 45.0
 
June 17, 2021, 7 a.m. 41.1 ppb (39) 16.8 ppb (16) N/A 24.0 ppb (23) N/A N/A N/A 0.15 ppb (2) N/A 2.0 μg/m3 (9) 39.0
 
June 17, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A N/A 0.15 ppb (2) N/A 3.0 μg/m3 (13) 13.0
 
June 17, 2021, 5 a.m. 50.2 ppb (48) 22.8 ppb (22) N/A 27.0 ppb (26) N/A N/A N/A 0.21 ppb (3) N/A 4.0 μg/m3 (17) 48.0
 
June 17, 2021, 4 a.m. 43.6 ppb (42) 16.7 ppb (16) N/A 27.0 ppb (26) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 42.0
 
June 17, 2021, 3 a.m. 17.0 ppb (17) 5.2 ppb (5) N/A 12.0 ppb (12) N/A N/A N/A 0.18 ppb (3) N/A 3.0 μg/m3 (13) 17.0
 
June 17, 2021, 2 a.m. 22.1 ppb (21) 8.9 ppb (9) N/A 13.0 ppb (13) N/A N/A N/A 0.19 ppb (3) N/A 4.0 μg/m3 (17) 21.0
 
June 17, 2021, 1 a.m. 15.2 ppb (15) 4.7 ppb (5) N/A 11.0 ppb (11) N/A N/A N/A 0.2 ppb (3) N/A 3.0 μg/m3 (13) 15.0
 
June 17, 2021, midnight 8.9 ppb (9) 2.2 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A 0.17 ppb (3) N/A 1.0 μg/m3 (5) 9.0
 
June 16, 2021, 11 p.m. 14.6 ppb (14) 3.7 ppb (4) N/A 11.0 ppb (11) N/A N/A N/A 0.26 ppb (4) N/A -2.0 μg/m3 (0) 14.0
 
June 16, 2021, 10 p.m. 11.8 ppb (12) 3.3 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A 0.17 ppb (3) N/A 0.0 μg/m3 (0) 12.0
 
June 16, 2021, 9 p.m. 12.9 ppb (13) 4.1 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A 0.17 ppb (3) N/A 2.0 μg/m3 (9) 13.0
 
June 16, 2021, 8 p.m. 9.4 ppb (9) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.14 ppb (2) N/A 3.0 μg/m3 (13) 13.0
 
June 16, 2021, 7 p.m. 10.8 ppb (11) 3.9 ppb (4) N/A 7.0 ppb (7) N/A N/A N/A 0.15 ppb (2) N/A 3.0 μg/m3 (13) 13.0
 
June 16, 2021, 6 p.m. 13.6 ppb (13) 5.6 ppb (6) N/A 8.0 ppb (8) N/A N/A N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
June 16, 2021, 5 p.m. 15.4 ppb (15) 6.6 ppb (7) N/A 9.0 ppb (9) N/A N/A N/A 0.16 ppb (3) N/A 5.0 μg/m3 (21) 21.0