ID: 2375

AQSQID: 240270006

Site Name: Howard County Near Road

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

Updated: Sept. 22, 2021, 8:01 a.m.

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
Sept. 22, 2021, 6 a.m. 26.1 ppb (25) 12.5 ppb (12) N/A 14.0 ppb (14) N/A N/A N/A 0.21 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 22, 2021, 5 a.m. 30.4 ppb (29) 14.8 ppb (14) N/A 16.0 ppb (16) N/A N/A N/A 0.21 ppb (3) N/A 6.0 μg/m3 (25) 29.0
 
Sept. 22, 2021, 4 a.m. 34.7 ppb (33) 17.4 ppb (17) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 33.0
 
Sept. 22, 2021, 3 a.m. 37.5 ppb (36) 19.6 ppb (19) N/A 18.0 ppb (17) N/A N/A N/A 0.27 ppb (4) N/A 3.0 μg/m3 (13) 36.0
 
Sept. 22, 2021, 2 a.m. 36.7 ppb (35) 17.9 ppb (17) N/A 19.0 ppb (18) N/A N/A N/A 0.28 ppb (4) N/A 3.0 μg/m3 (13) 35.0
 
Sept. 22, 2021, 1 a.m. 36.0 ppb (34) 17.4 ppb (17) N/A 19.0 ppb (18) N/A N/A N/A 0.29 ppb (4) N/A 3.0 μg/m3 (13) 34.0
 
Sept. 22, 2021, midnight 34.7 ppb (33) 16.2 ppb (16) N/A 19.0 ppb (18) N/A N/A N/A 0.34 ppb (4) N/A 3.0 μg/m3 (13) 33.0
 
Sept. 21, 2021, 11 p.m. 38.8 ppb (37) 18.7 ppb (18) N/A 20.0 ppb (19) N/A N/A N/A 0.38 ppb (5) N/A 4.0 μg/m3 (17) 37.0
 
Sept. 21, 2021, 10 p.m. 44.4 ppb (42) 22.9 ppb (22) N/A 22.0 ppb (21) N/A N/A N/A 0.42 ppb (5) N/A 2.0 μg/m3 (9) 42.0
 
Sept. 21, 2021, 9 p.m. 38.4 ppb (37) 20.0 ppb (19) N/A 18.0 ppb (17) N/A N/A N/A 0.43 ppb (5) N/A 1.0 μg/m3 (5) 37.0
 
Sept. 21, 2021, 8 p.m. 37.4 ppb (36) 21.6 ppb (21) N/A 16.0 ppb (16) N/A N/A N/A 0.43 ppb (5) N/A 3.0 μg/m3 (13) 36.0
 
Sept. 21, 2021, 7 p.m. 35.2 ppb (34) 20.1 ppb (19) N/A 15.0 ppb (15) N/A N/A N/A 0.39 ppb (5) N/A 4.0 μg/m3 (17) 34.0
 
Sept. 21, 2021, 6 p.m. 41.0 ppb (39) 24.3 ppb (23) N/A 17.0 ppb (17) N/A N/A N/A 0.39 ppb (5) N/A 6.0 μg/m3 (25) 39.0
 
Sept. 21, 2021, 5 p.m. 28.8 ppb (28) 17.1 ppb (17) N/A 12.0 ppb (12) N/A N/A N/A 0.33 ppb (4) N/A 6.0 μg/m3 (25) 28.0
 
Sept. 21, 2021, 4 p.m. 32.2 ppb (31) 20.6 ppb (20) N/A 12.0 ppb (12) N/A N/A N/A 0.36 ppb (5) N/A 6.0 μg/m3 (25) 31.0
 
Sept. 21, 2021, 3 p.m. 36.6 ppb (35) 23.5 ppb (23) N/A 13.0 ppb (13) N/A N/A N/A 0.33 ppb (4) N/A 2.0 μg/m3 (9) 35.0
 
Sept. 21, 2021, 2 p.m. 36.3 ppb (35) 22.4 ppb (22) N/A 14.0 ppb (14) N/A N/A N/A 0.33 ppb (4) N/A 4.0 μg/m3 (17) 35.0
 
Sept. 21, 2021, 1 p.m. 44.6 ppb (43) 28.2 ppb (27) N/A 16.0 ppb (16) N/A N/A N/A 0.4 ppb (5) N/A 6.0 μg/m3 (25) 43.0
 
Sept. 21, 2021, noon 53.8 ppb (51) 35.3 ppb (34) N/A 18.0 ppb (17) N/A N/A N/A 0.42 ppb (5) N/A 5.0 μg/m3 (21) 51.0
 
Sept. 21, 2021, 11 a.m. 56.7 ppb (54) 36.0 ppb (34) N/A 21.0 ppb (20) N/A N/A N/A 0.45 ppb (6) N/A 7.0 μg/m3 (30) 54.0
 
Sept. 21, 2021, 10 a.m. 58.2 ppb (56) 37.1 ppb (35) N/A 21.0 ppb (20) N/A N/A N/A 0.45 ppb (6) N/A 8.0 μg/m3 (34) 56.0
 
Sept. 21, 2021, 9 a.m. 55.0 ppb (53) 34.3 ppb (33) N/A 21.0 ppb (20) N/A N/A N/A 0.41 ppb (5) N/A 5.0 μg/m3 (21) 53.0
 
Sept. 21, 2021, 8 a.m. 47.6 ppb (45) 26.2 ppb (25) N/A 21.0 ppb (20) N/A N/A N/A 0.26 ppb (4) N/A 4.0 μg/m3 (17) 45.0
 
Sept. 21, 2021, 7 a.m. 47.7 ppb (45) 26.4 ppb (25) N/A 21.0 ppb (20) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 45.0
 
Sept. 21, 2021, 6 a.m. 46.1 ppb (44) 24.4 ppb (24) N/A 22.0 ppb (21) N/A N/A N/A 0.24 ppb (3) N/A 2.0 μg/m3 (9) 44.0
 
Sept. 21, 2021, 5 a.m. 42.6 ppb (41) 21.2 ppb (20) N/A 21.0 ppb (20) N/A N/A N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 41.0
 
Sept. 21, 2021, 4 a.m. 40.3 ppb (39) 18.9 ppb (18) N/A 21.0 ppb (20) N/A N/A N/A 0.22 ppb (3) N/A 4.0 μg/m3 (17) 39.0
 
Sept. 21, 2021, 3 a.m. 41.4 ppb (40) 21.8 ppb (21) N/A 20.0 ppb (19) N/A N/A N/A 0.24 ppb (3) N/A 3.0 μg/m3 (13) 40.0
 
Sept. 21, 2021, 2 a.m. 36.6 ppb (35) 18.7 ppb (18) N/A 18.0 ppb (17) N/A N/A N/A 0.24 ppb (3) N/A 3.0 μg/m3 (13) 35.0
 
Sept. 21, 2021, 1 a.m. 26.5 ppb (25) 12.9 ppb (13) N/A 14.0 ppb (14) N/A N/A N/A 0.21 ppb (3) N/A 5.0 μg/m3 (21) 25.0
 
Sept. 21, 2021, midnight 40.4 ppb (39) 21.4 ppb (21) N/A 19.0 ppb (18) N/A N/A N/A 0.3 ppb (4) N/A 6.0 μg/m3 (25) 39.0
 
Sept. 20, 2021, 11 p.m. 36.7 ppb (35) 19.1 ppb (19) N/A 18.0 ppb (17) N/A N/A N/A 0.29 ppb (4) N/A 4.0 μg/m3 (17) 35.0
 
Sept. 20, 2021, 10 p.m. 31.1 ppb (30) 15.1 ppb (15) N/A 16.0 ppb (16) N/A N/A N/A 0.28 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 20, 2021, 9 p.m. 29.2 ppb (28) 14.8 ppb (14) N/A 14.0 ppb (14) N/A N/A N/A 0.25 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Sept. 20, 2021, 8 p.m. 28.4 ppb (27) 15.0 ppb (15) N/A 13.0 ppb (13) N/A N/A N/A 0.29 ppb (4) N/A 5.0 μg/m3 (21) 27.0
 
Sept. 20, 2021, 7 p.m. 37.9 ppb (36) 20.7 ppb (20) N/A 17.0 ppb (17) N/A N/A N/A 0.3 ppb (4) N/A 5.0 μg/m3 (21) 36.0
 
Sept. 20, 2021, 6 p.m. 26.3 ppb (25) 14.5 ppb (14) N/A 12.0 ppb (12) N/A N/A N/A 0.27 ppb (4) N/A 4.0 μg/m3 (17) 25.0
 
Sept. 20, 2021, 5 p.m. 33.9 ppb (32) 18.0 ppb (17) N/A 16.0 ppb (16) N/A N/A N/A 0.26 ppb (4) N/A 6.0 μg/m3 (25) 32.0
 
Sept. 20, 2021, 4 p.m. 31.7 ppb (30) 17.8 ppb (17) N/A 14.0 ppb (14) N/A N/A N/A 0.29 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 20, 2021, 3 p.m. 29.6 ppb (28) 15.8 ppb (15) N/A 14.0 ppb (14) N/A N/A N/A 0.28 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Sept. 20, 2021, 2 p.m. 39.9 ppb (38) 24.4 ppb (24) N/A 15.0 ppb (15) N/A N/A N/A 0.3 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 20, 2021, 1 p.m. 60.8 ppb (59) 37.8 ppb (36) N/A 23.0 ppb (22) N/A N/A N/A 0.41 ppb (5) N/A 8.0 μg/m3 (34) 59.0
 
Sept. 20, 2021, noon 86.8 ppb (86) 67.6 ppb (66) N/A 19.0 ppb (18) N/A N/A N/A 0.59 ppb (7) N/A 10.0 μg/m3 (42) 86.0
 
Sept. 20, 2021, 11 a.m. 49.4 ppb (47) 38.9 ppb (37) N/A 11.0 ppb (11) N/A N/A N/A 0.4 ppb (5) N/A 5.0 μg/m3 (21) 47.0
 
Sept. 20, 2021, 10 a.m. 36.9 ppb (35) 26.8 ppb (26) N/A 10.0 ppb (10) N/A N/A N/A 0.34 ppb (4) N/A 6.0 μg/m3 (25) 35.0
 
Sept. 20, 2021, 9 a.m. 35.7 ppb (34) 24.9 ppb (24) N/A 11.0 ppb (11) N/A N/A N/A 0.36 ppb (5) N/A 7.0 μg/m3 (30) 34.0
 
Sept. 20, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.36 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 20, 2021, 7 a.m. 52.4 ppb (50) 38.7 ppb (37) N/A 14.0 ppb (14) N/A N/A N/A 0.33 ppb (4) N/A 7.0 μg/m3 (30) 50.0
 
Sept. 20, 2021, 6 a.m. 59.9 ppb (58) 42.9 ppb (41) N/A 17.0 ppb (17) N/A N/A N/A 0.35 ppb (4) N/A 6.0 μg/m3 (25) 58.0
 
Sept. 20, 2021, 5 a.m. 40.6 ppb (39) 25.5 ppb (25) N/A 15.0 ppb (15) N/A N/A N/A 0.36 ppb (5) N/A 4.0 μg/m3 (17) 39.0
 
Sept. 20, 2021, 4 a.m. 31.2 ppb (30) 19.8 ppb (19) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 30.0
 
Sept. 20, 2021, 3 a.m. 20.4 ppb (20) 10.9 ppb (11) N/A 10.0 ppb (10) N/A N/A N/A 0.33 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 20, 2021, 2 a.m. 26.3 ppb (25) 14.0 ppb (14) N/A 12.0 ppb (12) N/A N/A N/A 0.32 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 20, 2021, 1 a.m. 22.0 ppb (21) 6.5 ppb (7) N/A 15.0 ppb (15) N/A N/A N/A 0.32 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 20, 2021, midnight 25.5 ppb (25) 4.9 ppb (5) N/A 21.0 ppb (20) N/A N/A N/A 0.36 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 19, 2021, 11 p.m. 35.9 ppb (34) 10.2 ppb (10) N/A 26.0 ppb (25) N/A N/A N/A 0.43 ppb (5) N/A 4.0 μg/m3 (17) 34.0
 
Sept. 19, 2021, 10 p.m. 19.2 ppb (19) 7.0 ppb (7) N/A 12.0 ppb (12) N/A N/A N/A 0.27 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 19, 2021, 9 p.m. 16.2 ppb (16) 5.6 ppb (6) N/A 11.0 ppb (11) N/A N/A N/A 0.21 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 19, 2021, 8 p.m. 7.6 ppb (8) 2.2 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2021, 7 p.m. 6.7 ppb (7) 2.6 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.22 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 19, 2021, 6 p.m. 3.6 ppb (4) 1.1 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.2 ppb (3) N/A 3.0 μg/m3 (13) 13.0
 
Sept. 19, 2021, 5 p.m. 5.3 ppb (5) 1.7 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 19, 2021, 4 p.m. 10.1 ppb (10) 4.1 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 19, 2021, 3 p.m. 9.0 ppb (9) 3.9 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.24 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 19, 2021, 2 p.m. 11.3 ppb (11) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A 0.27 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2021, 1 p.m. 10.8 ppb (11) 4.8 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A 0.28 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2021, noon 15.1 ppb (15) 6.1 ppb (6) N/A 9.0 ppb (9) N/A N/A N/A 0.26 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 19, 2021, 11 a.m. 22.1 ppb (21) 8.4 ppb (8) N/A 14.0 ppb (14) N/A N/A N/A 0.31 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Sept. 19, 2021, 10 a.m. 17.1 ppb (17) 4.9 ppb (5) N/A 12.0 ppb (12) N/A N/A N/A 0.39 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2021, 9 a.m. 19.0 ppb (18) 7.8 ppb (8) N/A 11.0 ppb (11) N/A N/A N/A 0.36 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2021, 8 a.m. 23.0 ppb (22) 12.6 ppb (12) N/A 10.0 ppb (10) N/A N/A N/A 0.39 ppb (5) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 19, 2021, 7 a.m. 18.7 ppb (18) 8.7 ppb (9) N/A 10.0 ppb (10) N/A N/A N/A 0.32 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 19, 2021, 6 a.m. 17.7 ppb (17) 8.3 ppb (8) N/A 9.0 ppb (9) N/A N/A N/A 0.34 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 19, 2021, 5 a.m. 11.7 ppb (12) 5.0 ppb (5) N/A 7.0 ppb (7) N/A N/A N/A 0.29 ppb (4) N/A 2.0 μg/m3 (9) 12.0
 
Sept. 19, 2021, 4 a.m. 25.2 ppb (24) 15.4 ppb (15) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 24.0
 
Sept. 19, 2021, 3 a.m. 10.5 ppb (10) 4.4 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A 0.53 ppb (6) N/A 3.0 μg/m3 (13) 13.0
 
Sept. 19, 2021, 2 a.m. 9.9 ppb (10) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.51 ppb (6) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2021, 1 a.m. 7.8 ppb (8) 2.4 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.5 ppb (6) N/A 8.0 μg/m3 (34) 34.0
 
Sept. 19, 2021, midnight 7.1 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.56 ppb (7) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 18, 2021, 11 p.m. 11.4 ppb (11) 3.8 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A 0.51 ppb (6) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 18, 2021, 10 p.m. 16.0 ppb (16) 6.8 ppb (7) N/A 9.0 ppb (9) N/A N/A N/A 0.48 ppb (6) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 18, 2021, 9 p.m. 12.7 ppb (12) 4.4 ppb (5) N/A 8.0 ppb (8) N/A N/A N/A 0.48 ppb (6) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 18, 2021, 8 p.m. 17.8 ppb (17) 7.3 ppb (7) N/A 11.0 ppb (11) N/A N/A N/A 0.58 ppb (7) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 18, 2021, 7 p.m. 8.6 ppb (9) 3.1 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.47 ppb (6) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 18, 2021, 6 p.m. 9.8 ppb (10) 3.7 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.54 ppb (6) N/A 8.0 μg/m3 (34) 34.0
 
Sept. 18, 2021, 5 p.m. 10.9 ppb (11) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A 0.55 ppb (7) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 18, 2021, 4 p.m. 11.4 ppb (11) 4.7 ppb (5) N/A 7.0 ppb (7) N/A N/A N/A 0.55 ppb (7) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 18, 2021, 3 p.m. 8.2 ppb (8) 3.4 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.56 ppb (7) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 18, 2021, 2 p.m. 16.7 ppb (16) 9.1 ppb (9) N/A 8.0 ppb (8) N/A N/A N/A 0.59 ppb (7) N/A 8.0 μg/m3 (34) 34.0
 
Sept. 18, 2021, 1 p.m. 23.3 ppb (22) 14.0 ppb (14) N/A 9.0 ppb (9) N/A N/A N/A 0.65 ppb (8) N/A 4.0 μg/m3 (17) 22.0
 
Sept. 18, 2021, noon 30.3 ppb (29) 20.2 ppb (20) N/A 10.0 ppb (10) N/A N/A N/A 0.34 ppb (4) N/A 4.0 μg/m3 (17) 29.0
 
Sept. 18, 2021, 11 a.m. 46.1 ppb (44) 36.2 ppb (35) N/A 10.0 ppb (10) N/A N/A N/A 0.36 ppb (5) N/A 5.0 μg/m3 (21) 44.0
 
Sept. 18, 2021, 10 a.m. 38.2 ppb (37) 29.1 ppb (28) N/A 9.0 ppb (9) N/A N/A N/A 0.3 ppb (4) N/A 6.0 μg/m3 (25) 37.0
 
Sept. 18, 2021, 9 a.m. 39.4 ppb (38) 28.3 ppb (27) N/A 11.0 ppb (11) N/A N/A N/A 0.29 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 18, 2021, 8 a.m. 49.4 ppb (47) 34.7 ppb (33) N/A 15.0 ppb (15) N/A N/A N/A 0.31 ppb (4) N/A 9.0 μg/m3 (38) 47.0
 
Sept. 18, 2021, 7 a.m. 57.6 ppb (55) 43.0 ppb (41) N/A 15.0 ppb (15) N/A N/A N/A 0.33 ppb (4) N/A 8.0 μg/m3 (34) 55.0
 
Sept. 18, 2021, 6 a.m. 52.3 ppb (50) 37.5 ppb (36) N/A 15.0 ppb (15) N/A N/A N/A 0.36 ppb (5) N/A 8.0 μg/m3 (34) 50.0
 
Sept. 18, 2021, 5 a.m. 46.9 ppb (45) 32.2 ppb (31) N/A 15.0 ppb (15) N/A N/A N/A 0.35 ppb (4) N/A 7.0 μg/m3 (30) 45.0
 
Sept. 18, 2021, 4 a.m. 61.3 ppb (59) 43.6 ppb (42) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 59.0
 
Sept. 18, 2021, 3 a.m. 43.8 ppb (42) 26.9 ppb (26) N/A 17.0 ppb (17) N/A N/A N/A 0.35 ppb (4) N/A 9.0 μg/m3 (38) 42.0
 
Sept. 18, 2021, 2 a.m. 46.3 ppb (44) 21.2 ppb (20) N/A 25.0 ppb (24) N/A N/A N/A 0.35 ppb (4) N/A 10.0 μg/m3 (42) 44.0
 
Sept. 18, 2021, 1 a.m. 49.2 ppb (47) 24.1 ppb (23) N/A 25.0 ppb (24) N/A N/A N/A 0.46 ppb (6) N/A 6.0 μg/m3 (25) 47.0
 
Sept. 18, 2021, midnight 48.3 ppb (46) 23.3 ppb (22) N/A 25.0 ppb (24) N/A N/A N/A 0.46 ppb (6) N/A 6.0 μg/m3 (25) 46.0
 
Sept. 17, 2021, 11 p.m. 38.9 ppb (37) 18.5 ppb (18) N/A 20.0 ppb (19) N/A N/A N/A 0.44 ppb (5) N/A 5.0 μg/m3 (21) 37.0
 
Sept. 17, 2021, 10 p.m. 33.9 ppb (32) 15.5 ppb (15) N/A 18.0 ppb (17) N/A N/A N/A 0.41 ppb (5) N/A 6.0 μg/m3 (25) 32.0
 
Sept. 17, 2021, 9 p.m. 27.0 ppb (26) 11.6 ppb (11) N/A 15.0 ppb (15) N/A N/A N/A 0.33 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Sept. 17, 2021, 8 p.m. 25.9 ppb (25) 12.1 ppb (12) N/A 14.0 ppb (14) N/A N/A N/A 0.35 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 17, 2021, 7 p.m. 28.1 ppb (27) 14.2 ppb (14) N/A 14.0 ppb (14) N/A N/A N/A 0.31 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 17, 2021, 6 p.m. 24.1 ppb (23) 11.4 ppb (11) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 17, 2021, 5 p.m. 31.8 ppb (30) 17.6 ppb (17) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 30.0
 
Sept. 17, 2021, 4 p.m. 35.7 ppb (34) 19.7 ppb (19) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 34.0
 
Sept. 17, 2021, 3 p.m. 26.1 ppb (25) 14.8 ppb (14) N/A 11.0 ppb (11) N/A N/A N/A 0.28 ppb (4) N/A 4.0 μg/m3 (17) 25.0
 
Sept. 17, 2021, 2 p.m. 30.2 ppb (29) 17.3 ppb (17) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 29.0
 
Sept. 17, 2021, 1 p.m. 41.2 ppb (39) 24.0 ppb (23) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 39.0
 
Sept. 17, 2021, noon 16.8 ppb (16) 7.7 ppb (8) N/A 9.0 ppb (9) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 17, 2021, 11 a.m. 29.2 ppb (28) 15.2 ppb (15) N/A 14.0 ppb (14) N/A N/A N/A 0.29 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 17, 2021, 10 a.m. 32.9 ppb (32) 16.9 ppb (16) N/A 16.0 ppb (16) N/A N/A N/A 0.28 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Sept. 17, 2021, 9 a.m. 35.7 ppb (34) 18.1 ppb (18) N/A 18.0 ppb (17) N/A N/A N/A 0.27 ppb (4) N/A 7.0 μg/m3 (30) 34.0
 
Sept. 17, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.25 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Sept. 17, 2021, 7 a.m. 38.5 ppb (37) 17.9 ppb (17) N/A 21.0 ppb (20) N/A N/A N/A 0.2 ppb (3) N/A 6.0 μg/m3 (25) 37.0
 
Sept. 17, 2021, 6 a.m. 29.2 ppb (28) 10.8 ppb (11) N/A 18.0 ppb (17) N/A N/A N/A 0.21 ppb (3) N/A 5.0 μg/m3 (21) 28.0
 
Sept. 17, 2021, 5 a.m. 31.2 ppb (30) 13.0 ppb (13) N/A 18.0 ppb (17) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 30.0
 
Sept. 17, 2021, 4 a.m. 22.7 ppb (22) 9.3 ppb (9) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 22.0
 
Sept. 17, 2021, 3 a.m. 24.5 ppb (24) 10.9 ppb (11) N/A 14.0 ppb (14) N/A N/A N/A 0.28 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 17, 2021, 2 a.m. 30.9 ppb (30) 14.8 ppb (14) N/A 16.0 ppb (16) N/A N/A N/A 0.34 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Sept. 17, 2021, 1 a.m. 42.2 ppb (40) 20.3 ppb (20) N/A 22.0 ppb (21) N/A N/A N/A 0.35 ppb (4) N/A 7.0 μg/m3 (30) 40.0
 
Sept. 17, 2021, midnight 41.9 ppb (40) 19.8 ppb (19) N/A 22.0 ppb (21) N/A N/A N/A 0.36 ppb (5) N/A 7.0 μg/m3 (30) 40.0
 
Sept. 16, 2021, 11 p.m. 26.6 ppb (26) 10.9 ppb (11) N/A 16.0 ppb (16) N/A N/A N/A 0.35 ppb (4) N/A 6.0 μg/m3 (25) 26.0
 
Sept. 16, 2021, 10 p.m. 25.1 ppb (24) 12.2 ppb (12) N/A 13.0 ppb (13) N/A N/A N/A 0.4 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 16, 2021, 9 p.m. 34.7 ppb (33) 16.0 ppb (16) N/A 19.0 ppb (18) N/A N/A N/A 0.47 ppb (6) N/A 15.0 μg/m3 (58) 58.0
 
Sept. 16, 2021, 8 p.m. 36.9 ppb (35) 14.1 ppb (14) N/A 23.0 ppb (22) N/A N/A N/A 0.51 ppb (6) N/A 13.0 μg/m3 (53) 53.0
 
Sept. 16, 2021, 7 p.m. 30.9 ppb (30) 12.8 ppb (13) N/A 18.0 ppb (17) N/A N/A N/A 0.46 ppb (6) N/A 14.0 μg/m3 (55) 55.0
 
Sept. 16, 2021, 6 p.m. 26.8 ppb (26) 11.7 ppb (12) N/A 15.0 ppb (15) N/A N/A N/A 0.44 ppb (5) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 16, 2021, 5 p.m. 29.8 ppb (29) 11.5 ppb (11) N/A 18.0 ppb (17) N/A N/A N/A 0.43 ppb (5) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 16, 2021, 4 p.m. 31.1 ppb (30) 13.9 ppb (14) N/A 17.0 ppb (17) N/A N/A N/A 0.41 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 16, 2021, 3 p.m. 35.3 ppb (34) 18.3 ppb (18) N/A 17.0 ppb (17) N/A N/A N/A 0.41 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 16, 2021, 2 p.m. 40.4 ppb (39) 22.0 ppb (21) N/A 18.0 ppb (17) N/A N/A N/A 0.43 ppb (5) N/A 5.0 μg/m3 (21) 39.0
 
Sept. 16, 2021, 1 p.m. 37.1 ppb (35) 20.4 ppb (20) N/A 17.0 ppb (17) N/A N/A N/A 0.44 ppb (5) N/A 8.0 μg/m3 (34) 35.0
 
Sept. 16, 2021, noon 27.6 ppb (27) 13.0 ppb (13) N/A 15.0 ppb (15) N/A N/A N/A 0.37 ppb (5) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 16, 2021, 11 a.m. 46.2 ppb (44) 25.8 ppb (25) N/A 20.0 ppb (19) N/A N/A N/A 0.47 ppb (6) N/A 7.0 μg/m3 (30) 44.0
 
Sept. 16, 2021, 10 a.m. 43.7 ppb (42) 22.4 ppb (22) N/A 21.0 ppb (20) N/A N/A N/A 0.42 ppb (5) N/A 6.0 μg/m3 (25) 42.0
 
Sept. 16, 2021, 9 a.m. 28.8 ppb (28) 11.5 ppb (11) N/A 17.0 ppb (17) N/A N/A N/A 0.33 ppb (4) N/A 5.0 μg/m3 (21) 28.0
 
Sept. 16, 2021, 8 a.m. 31.8 ppb (30) 13.6 ppb (13) N/A 18.0 ppb (17) N/A N/A N/A 0.24 ppb (3) N/A 2.0 μg/m3 (9) 30.0
 
Sept. 16, 2021, 7 a.m. 22.5 ppb (22) 7.0 ppb (7) N/A 16.0 ppb (16) N/A N/A N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 22.0
 
Sept. 16, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A N/A 0.26 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 16, 2021, 5 a.m. 38.2 ppb (37) 15.4 ppb (15) N/A 23.0 ppb (22) N/A N/A N/A 0.27 ppb (4) N/A 6.0 μg/m3 (25) 37.0
 
Sept. 16, 2021, 4 a.m. 39.9 ppb (38) 15.6 ppb (15) N/A 24.0 ppb (23) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 38.0
 
Sept. 16, 2021, 3 a.m. 30.7 ppb (29) 10.3 ppb (10) N/A 20.0 ppb (19) N/A N/A N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 29.0
 
Sept. 16, 2021, 2 a.m. 18.2 ppb (18) 3.7 ppb (4) N/A 14.0 ppb (14) N/A N/A N/A 0.21 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Sept. 16, 2021, 1 a.m. 19.0 ppb (18) 4.1 ppb (4) N/A 15.0 ppb (15) N/A N/A N/A 0.24 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 16, 2021, midnight 55.1 ppb (53) 23.8 ppb (23) N/A 31.0 ppb (30) N/A N/A N/A 0.45 ppb (6) N/A 8.0 μg/m3 (34) 53.0
 
Sept. 15, 2021, 11 p.m. 48.9 ppb (47) 20.2 ppb (20) N/A 29.0 ppb (28) N/A N/A N/A 0.46 ppb (6) N/A 11.0 μg/m3 (46) 47.0
 
Sept. 15, 2021, 10 p.m. 39.0 ppb (37) 14.6 ppb (14) N/A 24.0 ppb (23) N/A N/A N/A 0.45 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 15, 2021, 9 p.m. 33.9 ppb (32) 13.3 ppb (13) N/A 21.0 ppb (20) N/A N/A N/A 0.44 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 15, 2021, 8 p.m. 31.9 ppb (31) 11.9 ppb (12) N/A 20.0 ppb (19) N/A N/A N/A 0.38 ppb (5) N/A 14.0 μg/m3 (55) 55.0
 
Sept. 15, 2021, 7 p.m. 36.8 ppb (35) 14.5 ppb (14) N/A 22.0 ppb (21) N/A N/A N/A 0.39 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 15, 2021, 6 p.m. 35.5 ppb (34) 14.2 ppb (14) N/A 21.0 ppb (20) N/A N/A N/A 0.42 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 15, 2021, 5 p.m. 33.6 ppb (32) 14.2 ppb (14) N/A 19.0 ppb (18) N/A N/A N/A 0.37 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 15, 2021, 4 p.m. 40.6 ppb (39) 16.4 ppb (16) N/A 24.0 ppb (23) N/A N/A N/A 0.37 ppb (5) N/A 14.0 μg/m3 (55) 55.0
 
Sept. 15, 2021, 3 p.m. 39.5 ppb (38) 16.9 ppb (16) N/A 23.0 ppb (22) N/A N/A N/A 0.4 ppb (5) N/A 19.0 μg/m3 (66) 66.0
 
Sept. 15, 2021, 2 p.m. 50.2 ppb (48) 25.7 ppb (25) N/A 25.0 ppb (24) N/A N/A N/A 0.41 ppb (5) N/A 17.0 μg/m3 (62) 62.0
 
Sept. 15, 2021, 1 p.m. 53.3 ppb (51) 29.4 ppb (28) N/A 24.0 ppb (23) N/A N/A N/A 0.44 ppb (5) N/A 16.0 μg/m3 (60) 60.0
 
Sept. 15, 2021, noon 82.3 ppb (82) 53.4 ppb (51) N/A 29.0 ppb (28) N/A N/A N/A 0.65 ppb (8) N/A 21.0 μg/m3 (70) 82.0
 
Sept. 15, 2021, 11 a.m. 75.3 ppb (74) 48.5 ppb (46) N/A 27.0 ppb (26) N/A N/A N/A 0.57 ppb (7) N/A 21.0 μg/m3 (70) 74.0
 
Sept. 15, 2021, 10 a.m. 99.1 ppb (100) 70.1 ppb (69) N/A 29.0 ppb (28) N/A N/A N/A 0.65 ppb (8) N/A 14.0 μg/m3 (55) 100.0
 
Sept. 15, 2021, 9 a.m. 70.8 ppb (69) 47.1 ppb (45) N/A 24.0 ppb (23) N/A N/A N/A 0.55 ppb (7) N/A 19.0 μg/m3 (66) 69.0
 
Sept. 15, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.41 ppb (5) N/A 17.0 μg/m3 (62) 62.0
 
Sept. 15, 2021, 7 a.m. 53.5 ppb (51) 29.1 ppb (28) N/A 24.0 ppb (23) N/A N/A N/A 0.34 ppb (4) N/A 13.0 μg/m3 (53) 53.0