ID: 2375

AQSQID: 240270006

Site Name: Howard County Near Road

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

Updated: Sept. 24, 2020, 4:38 a.m.

Location: Laurel (I 95), MD

Reporting: True, Located: True

Current AQI: 66.0

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. 24, 2020, 3 a.m. 68.8 ppb (66) 40.1 ppb (37) N/A 29.0 ppb (27) N/A N/A N/A 0.3 ppb (3) N/A 9.0 μg/m3 (38) 66.0
 
Sept. 24, 2020, 2 a.m. 45.2 ppb (42) 21.4 ppb (20) N/A 24.0 ppb (22) N/A N/A N/A 0.26 ppb (3) N/A 7.0 μg/m3 (29) 42.0
 
Sept. 24, 2020, 1 a.m. 12.0 ppb (11) 2.4 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.21 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 24, 2020, midnight 12.9 ppb (12) 2.4 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 23, 2020, 11 p.m. 10.5 ppb (10) 2.1 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.2 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 23, 2020, 10 p.m. 9.0 ppb (8) 1.9 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
 
Sept. 23, 2020, 9 p.m. 15.2 ppb (14) 4.3 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.19 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 23, 2020, 8 p.m. 11.0 ppb (10) 3.2 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 23, 2020, 7 p.m. 11.4 ppb (11) 3.7 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.18 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 23, 2020, 6 p.m. 9.5 ppb (9) 3.3 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 23, 2020, 5 p.m. 6.8 ppb (6) 2.2 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.16 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 23, 2020, 4 p.m. 10.1 ppb (9) 3.4 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A 0.18 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 23, 2020, 3 p.m. 5.3 ppb (5) 1.3 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.16 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 23, 2020, 2 p.m. 8.4 ppb (8) 2.6 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.18 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 23, 2020, 1 p.m. 12.1 ppb (11) 4.1 ppb (4) N/A 8.0 ppb (7) N/A N/A N/A 0.19 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 23, 2020, noon 20.2 ppb (19) 8.5 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
 
Sept. 23, 2020, 11 a.m. 49.6 ppb (46) 26.1 ppb (24) N/A 24.0 ppb (22) N/A N/A N/A 0.27 ppb (3) N/A 7.0 μg/m3 (29) 46.0
 
Sept. 23, 2020, 10 a.m. 38.8 ppb (36) 17.2 ppb (16) 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
 
Sept. 23, 2020, 9 a.m. 39.4 ppb (36) 17.3 ppb (16) N/A 22.0 ppb (20) N/A N/A N/A 0.22 ppb (2) N/A 7.0 μg/m3 (29) 36.0
 
Sept. 23, 2020, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.2 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 23, 2020, 7 a.m. 48.3 ppb (45) 23.8 ppb (22) N/A 24.0 ppb (22) N/A N/A N/A 0.19 ppb (2) N/A 9.0 μg/m3 (38) 45.0
 
Sept. 23, 2020, 6 a.m. 57.9 ppb (54) 34.5 ppb (32) N/A 23.0 ppb (21) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 54.0
 
Sept. 23, 2020, 5 a.m. 60.8 ppb (57) 34.9 ppb (32) N/A 26.0 ppb (24) N/A N/A N/A 0.22 ppb (2) N/A 7.0 μg/m3 (29) 57.0
 
Sept. 23, 2020, 4 a.m. 66.9 ppb (64) 38.0 ppb (35) N/A 29.0 ppb (27) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 64.0
 
Sept. 23, 2020, 3 a.m. 39.2 ppb (36) 18.4 ppb (17) N/A 21.0 ppb (19) N/A N/A N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 36.0
 
Sept. 23, 2020, 2 a.m. 35.5 ppb (33) 14.7 ppb (14) N/A 21.0 ppb (19) N/A N/A N/A 0.24 ppb (3) N/A 7.0 μg/m3 (29) 33.0
 
Sept. 23, 2020, 1 a.m. 30.8 ppb (29) 13.9 ppb (13) N/A 17.0 ppb (16) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 29.0
 
Sept. 23, 2020, midnight 21.6 ppb (20) 7.8 ppb (7) N/A 14.0 ppb (13) N/A N/A N/A 0.22 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 22, 2020, 11 p.m. 8.8 ppb (8) 2.8 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.18 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 22, 2020, 10 p.m. 12.1 ppb (11) 4.0 ppb (4) 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
 
Sept. 22, 2020, 9 p.m. 10.2 ppb (9) 3.1 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A 0.19 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 22, 2020, 8 p.m. 8.8 ppb (8) 3.2 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 22, 2020, 7 p.m. 6.8 ppb (6) 2.2 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Sept. 22, 2020, 6 p.m. 8.4 ppb (8) 3.7 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Sept. 22, 2020, 5 p.m. 8.8 ppb (8) 4.1 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Sept. 22, 2020, 4 p.m. 15.9 ppb (15) 7.3 ppb (7) 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
 
Sept. 22, 2020, 3 p.m. 14.5 ppb (13) 5.9 ppb (5) N/A 9.0 ppb (8) N/A N/A N/A 0.17 ppb (2) N/A 2.0 μg/m3 (8) 13.0
 
Sept. 22, 2020, 2 p.m. 13.8 ppb (13) 5.1 ppb (5) N/A 9.0 ppb (8) N/A N/A N/A 0.18 ppb (2) N/A 1.0 μg/m3 (4) 13.0
 
Sept. 22, 2020, 1 p.m. 23.9 ppb (22) 11.1 ppb (10) N/A 13.0 ppb (12) N/A N/A N/A 0.21 ppb (2) N/A 3.0 μg/m3 (12) 22.0
 
Sept. 22, 2020, noon 42.5 ppb (39) 25.3 ppb (23) N/A 17.0 ppb (16) N/A N/A N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 39.0
 
Sept. 22, 2020, 11 a.m. 56.1 ppb (52) 38.2 ppb (35) N/A 18.0 ppb (17) N/A N/A N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 52.0
 
Sept. 22, 2020, 10 a.m. 75.0 ppb (72) 54.3 ppb (50) N/A 21.0 ppb (19) N/A N/A N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 72.0
 
Sept. 22, 2020, 9 a.m. 43.7 ppb (40) 29.4 ppb (27) N/A 14.0 ppb (13) N/A N/A N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 40.0
 
Sept. 22, 2020, 8 a.m. 18.8 ppb (17) 9.7 ppb (9) N/A 9.0 ppb (8) N/A N/A N/A 0.16 ppb (2) N/A 2.0 μg/m3 (8) 17.0
 
Sept. 22, 2020, 7 a.m. 8.3 ppb (8) 3.1 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
Sept. 22, 2020, 6 a.m. 5.7 ppb (5) 1.1 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.16 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 22, 2020, 5 a.m. 16.4 ppb (15) 7.8 ppb (7) 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
 
Sept. 22, 2020, 4 a.m. 15.2 ppb (14) 7.7 ppb (7) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 14.0
 
Sept. 22, 2020, 3 a.m. 16.1 ppb (15) 8.4 ppb (8) N/A 8.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 22, 2020, 2 a.m. 18.3 ppb (17) 8.6 ppb (8) N/A 10.0 ppb (9) N/A N/A N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 22, 2020, 1 a.m. 40.6 ppb (38) 23.9 ppb (22) N/A 17.0 ppb (16) N/A N/A N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 38.0
 
Sept. 22, 2020, midnight 45.5 ppb (42) 23.9 ppb (22) N/A 22.0 ppb (20) N/A N/A N/A 0.27 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 21, 2020, 11 p.m. 61.4 ppb (58) 30.4 ppb (28) N/A 31.0 ppb (29) N/A N/A N/A 0.3 ppb (3) N/A 12.0 μg/m3 (50) 58.0
 
Sept. 21, 2020, 10 p.m. 50.8 ppb (47) 23.3 ppb (22) N/A 27.0 ppb (25) N/A N/A N/A 0.39 ppb (4) N/A 10.0 μg/m3 (42) 47.0
 
Sept. 21, 2020, 9 p.m. 43.0 ppb (40) 20.8 ppb (19) N/A 22.0 ppb (20) N/A N/A N/A 0.38 ppb (4) N/A 4.0 μg/m3 (17) 40.0
 
Sept. 21, 2020, 8 p.m. 36.6 ppb (34) 18.2 ppb (17) N/A 18.0 ppb (17) N/A N/A N/A 0.32 ppb (4) N/A 5.0 μg/m3 (21) 34.0
 
Sept. 21, 2020, 7 p.m. 30.7 ppb (28) 17.6 ppb (16) N/A 13.0 ppb (12) N/A N/A N/A 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 21, 2020, 6 p.m. 25.3 ppb (23) 13.9 ppb (13) N/A 11.0 ppb (10) N/A N/A N/A 0.27 ppb (3) N/A N/A 23.0
 
Sept. 21, 2020, 5 p.m. 26.8 ppb (25) 15.5 ppb (14) N/A 11.0 ppb (10) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 25.0
 
Sept. 21, 2020, 4 p.m. 24.8 ppb (23) 14.2 ppb (13) N/A 11.0 ppb (10) N/A N/A N/A 0.2 ppb (2) N/A 0.0 μg/m3 (0) 23.0
 
Sept. 21, 2020, 3 p.m. 23.9 ppb (22) 13.1 ppb (12) N/A 11.0 ppb (10) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 22.0
 
Sept. 21, 2020, 2 p.m. 25.5 ppb (24) 15.0 ppb (14) N/A 10.0 ppb (9) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 24.0
 
Sept. 21, 2020, 1 p.m. 35.9 ppb (33) 21.4 ppb (20) N/A 15.0 ppb (14) N/A N/A N/A 0.26 ppb (3) N/A 4.0 μg/m3 (17) 33.0
 
Sept. 21, 2020, noon 33.6 ppb (31) 20.3 ppb (19) N/A 13.0 ppb (12) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 31.0
 
Sept. 21, 2020, 11 a.m. 32.6 ppb (30) 19.3 ppb (18) N/A 13.0 ppb (12) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 30.0
 
Sept. 21, 2020, 10 a.m. 37.9 ppb (35) 22.7 ppb (21) N/A 15.0 ppb (14) N/A N/A N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 35.0
 
Sept. 21, 2020, 9 a.m. 28.2 ppb (26) 16.0 ppb (15) N/A 12.0 ppb (11) N/A N/A N/A 0.18 ppb (2) N/A 4.0 μg/m3 (17) 26.0
 
Sept. 21, 2020, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 21, 2020, 7 a.m. 27.3 ppb (25) 15.8 ppb (15) N/A 12.0 ppb (11) N/A N/A N/A 0.18 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 21, 2020, 6 a.m. 24.7 ppb (23) 14.0 ppb (13) N/A 11.0 ppb (10) N/A N/A N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 21, 2020, 5 a.m. 30.1 ppb (28) 18.5 ppb (17) N/A 12.0 ppb (11) N/A N/A N/A 0.21 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 21, 2020, 4 a.m. 65.6 ppb (62) 44.7 ppb (41) N/A 21.0 ppb (19) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 62.0
 
Sept. 21, 2020, 3 a.m. 61.1 ppb (58) 39.5 ppb (37) N/A 22.0 ppb (20) N/A N/A N/A 0.28 ppb (3) N/A 10.0 μg/m3 (42) 58.0
 
Sept. 21, 2020, 2 a.m. 58.3 ppb (55) 38.6 ppb (36) N/A 20.0 ppb (19) N/A N/A N/A 0.25 ppb (3) N/A 8.0 μg/m3 (33) 55.0
 
Sept. 21, 2020, 1 a.m. 38.6 ppb (36) 21.5 ppb (20) N/A 17.0 ppb (16) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 36.0
 
Sept. 21, 2020, midnight 51.4 ppb (48) 26.8 ppb (25) N/A 25.0 ppb (23) N/A N/A N/A 0.35 ppb (4) N/A 5.0 μg/m3 (21) 48.0
 
Sept. 20, 2020, 11 p.m. 30.4 ppb (28) 9.7 ppb (9) N/A 21.0 ppb (19) N/A N/A N/A 0.25 ppb (3) N/A 0.0 μg/m3 (0) 28.0
 
Sept. 20, 2020, 10 p.m. 22.5 ppb (21) 9.9 ppb (9) N/A 13.0 ppb (12) N/A N/A N/A 0.31 ppb (3) N/A 0.0 μg/m3 (0) 21.0
 
Sept. 20, 2020, 9 p.m. 15.1 ppb (14) 6.6 ppb (6) N/A 8.0 ppb (7) N/A N/A N/A 0.26 ppb (3) N/A 2.0 μg/m3 (8) 14.0
 
Sept. 20, 2020, 8 p.m. 13.3 ppb (12) 6.3 ppb (6) 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
 
Sept. 20, 2020, 7 p.m. 10.0 ppb (9) 4.8 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.23 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 20, 2020, 6 p.m. 8.9 ppb (8) 4.2 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (2) N/A 0.0 μg/m3 (0) 8.0
 
Sept. 20, 2020, 5 p.m. 10.1 ppb (9) 4.8 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.16 ppb (2) N/A 1.0 μg/m3 (4) 9.0
 
Sept. 20, 2020, 4 p.m. 12.5 ppb (12) 7.0 ppb (6) 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
 
Sept. 20, 2020, 3 p.m. 11.1 ppb (10) 5.7 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 20, 2020, 2 p.m. 11.1 ppb (10) 6.0 ppb (6) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 20, 2020, 1 p.m. 17.0 ppb (16) 8.8 ppb (8) N/A 8.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 20, 2020, noon 13.4 ppb (12) 6.0 ppb (6) N/A 7.0 ppb (6) N/A N/A N/A 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 20, 2020, 11 a.m. 22.6 ppb (21) 12.9 ppb (12) N/A 10.0 ppb (9) N/A N/A N/A 0.2 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 20, 2020, 10 a.m. 27.5 ppb (25) 17.8 ppb (16) N/A 10.0 ppb (9) N/A N/A N/A 0.21 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
Sept. 20, 2020, 9 a.m. 23.8 ppb (22) 14.8 ppb (14) N/A 9.0 ppb (8) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 20, 2020, 8 a.m. 14.9 ppb (14) 8.2 ppb (8) N/A 7.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 20, 2020, 7 a.m. 16.0 ppb (15) 8.7 ppb (8) N/A 7.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 20, 2020, 6 a.m. 19.5 ppb (18) 11.6 ppb (11) N/A 8.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 20, 2020, 5 a.m. 22.9 ppb (21) 14.9 ppb (14) N/A 8.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
Sept. 20, 2020, 4 a.m. 33.1 ppb (31) 23.5 ppb (22) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 20, 2020, 3 a.m. 20.9 ppb (19) 13.2 ppb (12) N/A 8.0 ppb (7) N/A N/A N/A 0.36 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
Sept. 20, 2020, 2 a.m. 14.4 ppb (13) 6.0 ppb (6) N/A 8.0 ppb (7) N/A N/A N/A 0.4 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
Sept. 20, 2020, 1 a.m. 13.9 ppb (13) 5.5 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A 0.36 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
Sept. 20, 2020, midnight 7.3 ppb (7) 2.2 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.3 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 19, 2020, 11 p.m. 10.6 ppb (10) 2.5 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.3 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2020, 10 p.m. 16.2 ppb (15) 3.7 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.28 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 19, 2020, 9 p.m. 14.7 ppb (14) 6.2 ppb (6) N/A 8.0 ppb (7) N/A N/A N/A 0.32 ppb (4) N/A 3.0 μg/m3 (12) 14.0
 
Sept. 19, 2020, 8 p.m. 9.1 ppb (8) 4.0 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.26 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
Sept. 19, 2020, 7 p.m. 14.6 ppb (14) 6.9 ppb (6) N/A 8.0 ppb (7) N/A N/A N/A 0.26 ppb (3) N/A 1.0 μg/m3 (4) 14.0
 
Sept. 19, 2020, 6 p.m. 8.7 ppb (8) 4.2 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.24 ppb (3) N/A 1.0 μg/m3 (4) 8.0
 
Sept. 19, 2020, 5 p.m. 9.9 ppb (9) 4.8 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.26 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 19, 2020, 4 p.m. 9.3 ppb (9) 4.9 ppb (5) N/A 4.0 ppb (4) N/A N/A N/A 0.26 ppb (3) N/A 1.0 μg/m3 (4) 9.0
 
Sept. 19, 2020, 3 p.m. 10.6 ppb (10) 6.0 ppb (6) N/A 5.0 ppb (5) N/A N/A N/A 0.24 ppb (3) N/A 2.0 μg/m3 (8) 10.0
 
Sept. 19, 2020, 2 p.m. 13.6 ppb (13) 7.6 ppb (7) N/A 6.0 ppb (6) N/A N/A N/A 0.26 ppb (3) N/A 3.0 μg/m3 (12) 13.0
 
Sept. 19, 2020, 1 p.m. 16.3 ppb (15) 8.9 ppb (8) N/A 7.0 ppb (6) N/A N/A N/A 0.26 ppb (3) N/A 1.0 μg/m3 (4) 15.0
 
Sept. 19, 2020, noon 15.6 ppb (14) 8.3 ppb (8) N/A 7.0 ppb (6) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 14.0
 
Sept. 19, 2020, 11 a.m. 17.6 ppb (16) 7.4 ppb (7) N/A 10.0 ppb (9) N/A N/A N/A 0.17 ppb (2) N/A 2.0 μg/m3 (8) 16.0
 
Sept. 19, 2020, 10 a.m. 25.2 ppb (23) 11.5 ppb (11) N/A 14.0 ppb (13) N/A N/A N/A 0.17 ppb (2) N/A 3.0 μg/m3 (12) 23.0
 
Sept. 19, 2020, 9 a.m. 33.7 ppb (31) 16.2 ppb (15) N/A 18.0 ppb (17) N/A N/A N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 31.0
 
Sept. 19, 2020, 8 a.m. 26.8 ppb (25) 11.0 ppb (10) N/A 16.0 ppb (15) N/A N/A N/A 0.15 ppb (2) N/A 3.0 μg/m3 (12) 25.0
 
Sept. 19, 2020, 7 a.m. 20.6 ppb (19) 8.0 ppb (7) N/A 13.0 ppb (12) N/A N/A N/A 0.15 ppb (2) N/A 3.0 μg/m3 (12) 19.0
 
Sept. 19, 2020, 6 a.m. 12.7 ppb (12) 3.9 ppb (4) N/A 9.0 ppb (8) N/A N/A N/A 0.14 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 19, 2020, 5 a.m. 5.9 ppb (5) 1.7 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.14 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 19, 2020, 4 a.m. 6.4 ppb (6) 1.8 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.11 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 19, 2020, 3 a.m. 7.4 ppb (7) 1.8 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.24 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
Sept. 19, 2020, 2 a.m. 6.5 ppb (6) 1.8 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 19, 2020, 1 a.m. 19.5 ppb (18) 6.5 ppb (6) N/A 13.0 ppb (12) N/A N/A N/A 0.31 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 19, 2020, midnight 16.5 ppb (15) 5.6 ppb (5) N/A 11.0 ppb (10) N/A N/A N/A 0.35 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 18, 2020, 11 p.m. 7.2 ppb (7) 2.5 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.34 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2020, 10 p.m. 19.6 ppb (18) 7.2 ppb (7) N/A 12.0 ppb (11) N/A N/A N/A 0.35 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 18, 2020, 9 p.m. 8.7 ppb (8) 2.6 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.32 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 18, 2020, 8 p.m. 8.4 ppb (8) 3.6 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.32 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
Sept. 18, 2020, 7 p.m. 9.5 ppb (9) 3.4 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.33 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
Sept. 18, 2020, 6 p.m. 10.7 ppb (10) 4.6 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.35 ppb (4) N/A 21.0 μg/m3 (69) 69.0
 
Sept. 18, 2020, 5 p.m. 9.5 ppb (9) 4.2 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.34 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 18, 2020, 4 p.m. 11.1 ppb (10) 4.9 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A 0.3 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 18, 2020, 3 p.m. N/A N/A N/A N/A N/A N/A N/A 0.29 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 18, 2020, 2 p.m. 11.9 ppb (11) 5.8 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A 0.29 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 18, 2020, 1 p.m. 12.9 ppb (12) 6.0 ppb (6) N/A 7.0 ppb (6) N/A N/A N/A 0.29 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 18, 2020, noon 20.0 ppb (19) 9.8 ppb (9) N/A 10.0 ppb (9) N/A N/A N/A 0.29 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 18, 2020, 11 a.m. 24.2 ppb (22) 12.6 ppb (12) N/A 12.0 ppb (11) N/A N/A N/A 0.31 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 18, 2020, 10 a.m. 32.8 ppb (30) 19.4 ppb (18) N/A 13.0 ppb (12) N/A N/A N/A 0.32 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 18, 2020, 9 a.m. 25.9 ppb (24) 13.9 ppb (13) N/A 12.0 ppb (11) N/A N/A N/A 0.33 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2020, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.3 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2020, 7 a.m. 45.1 ppb (42) 27.5 ppb (25) N/A 18.0 ppb (17) N/A N/A N/A 0.25 ppb (3) N/A 9.0 μg/m3 (38) 42.0
 
Sept. 18, 2020, 6 a.m. 28.5 ppb (26) 13.8 ppb (13) N/A 15.0 ppb (14) N/A N/A N/A 0.24 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2020, 5 a.m. 37.3 ppb (35) 20.8 ppb (19) N/A 16.0 ppb (15) N/A N/A N/A 0.25 ppb (3) N/A 7.0 μg/m3 (29) 35.0
 
Sept. 18, 2020, 4 a.m. 41.5 ppb (38) 22.5 ppb (21) N/A 19.0 ppb (18) N/A N/A N/A 0.25 ppb (3) N/A 8.0 μg/m3 (33) 38.0
 
Sept. 18, 2020, 3 a.m. 39.6 ppb (37) 21.1 ppb (20) N/A 19.0 ppb (18) N/A N/A N/A 0.2 ppb (2) N/A 8.0 μg/m3 (33) 37.0
 
Sept. 18, 2020, 2 a.m. 44.7 ppb (41) 25.3 ppb (23) N/A 19.0 ppb (18) N/A N/A N/A 0.2 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 18, 2020, 1 a.m. 45.0 ppb (42) 24.7 ppb (23) N/A 20.0 ppb (19) N/A N/A N/A 0.28 ppb (3) N/A 9.0 μg/m3 (38) 42.0
 
Sept. 18, 2020, midnight 53.6 ppb (50) 32.3 ppb (30) N/A 21.0 ppb (19) N/A N/A N/A 0.39 ppb (4) N/A 9.0 μg/m3 (38) 50.0
 
Sept. 17, 2020, 11 p.m. 53.4 ppb (49) 30.8 ppb (29) N/A 23.0 ppb (21) N/A N/A N/A 0.42 ppb (5) N/A 11.0 μg/m3 (46) 49.0
 
Sept. 17, 2020, 10 p.m. 56.5 ppb (53) 33.4 ppb (31) N/A 23.0 ppb (21) N/A N/A N/A 0.44 ppb (5) N/A 15.0 μg/m3 (56) 56.0
 
Sept. 17, 2020, 9 p.m. 64.4 ppb (61) 41.2 ppb (38) N/A 23.0 ppb (21) N/A N/A N/A 0.52 ppb (6) N/A 13.0 μg/m3 (52) 61.0
 
Sept. 17, 2020, 8 p.m. 57.4 ppb (54) 35.1 ppb (32) N/A 22.0 ppb (20) N/A N/A N/A 0.45 ppb (5) N/A 8.0 μg/m3 (33) 54.0
 
Sept. 17, 2020, 7 p.m. 45.4 ppb (42) 26.0 ppb (24) N/A 19.0 ppb (18) N/A N/A N/A 0.4 ppb (4) N/A 6.0 μg/m3 (25) 42.0
 
Sept. 17, 2020, 6 p.m. 60.7 ppb (57) 36.2 ppb (34) N/A 25.0 ppb (23) N/A N/A N/A 0.43 ppb (5) N/A 9.0 μg/m3 (38) 57.0
 
Sept. 17, 2020, 5 p.m. 60.7 ppb (57) 36.2 ppb (34) N/A 25.0 ppb (23) N/A N/A N/A 0.4 ppb (4) N/A 8.0 μg/m3 (33) 57.0
 
Sept. 17, 2020, 4 p.m. 61.1 ppb (58) 40.1 ppb (37) N/A 21.0 ppb (19) N/A N/A N/A 0.35 ppb (4) N/A 9.0 μg/m3 (38) 58.0
 
Sept. 17, 2020, 3 p.m. 52.9 ppb (49) 33.4 ppb (31) N/A 19.0 ppb (18) N/A N/A N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 49.0
 
Sept. 17, 2020, 2 p.m. 70.6 ppb (68) 50.3 ppb (47) N/A 20.0 ppb (19) N/A N/A N/A 0.37 ppb (4) N/A 12.0 μg/m3 (50) 68.0
 
Sept. 17, 2020, 1 p.m. 74.1 ppb (71) 55.6 ppb (52) N/A 19.0 ppb (18) N/A N/A N/A 0.43 ppb (5) N/A 8.0 μg/m3 (33) 71.0
 
Sept. 17, 2020, noon 69.7 ppb (67) 57.2 ppb (53) N/A 13.0 ppb (12) N/A N/A N/A 0.43 ppb (5) N/A 7.0 μg/m3 (29) 67.0
 
Sept. 17, 2020, 11 a.m. 38.6 ppb (36) 29.4 ppb (27) N/A 9.0 ppb (8) N/A N/A N/A 0.28 ppb (3) N/A 4.0 μg/m3 (17) 36.0
 
Sept. 17, 2020, 10 a.m. 34.8 ppb (32) 26.2 ppb (24) N/A 9.0 ppb (8) N/A N/A N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 32.0
 
Sept. 17, 2020, 9 a.m. 49.0 ppb (45) 38.0 ppb (35) N/A 11.0 ppb (10) N/A N/A N/A 0.3 ppb (3) N/A 7.0 μg/m3 (29) 45.0
 
Sept. 17, 2020, 8 a.m. 45.5 ppb (42) 35.0 ppb (32) N/A 10.0 ppb (9) N/A N/A N/A 0.28 ppb (3) N/A 6.0 μg/m3 (25) 42.0
 
Sept. 17, 2020, 7 a.m. 35.5 ppb (33) 25.5 ppb (24) N/A 10.0 ppb (9) N/A N/A N/A 0.27 ppb (3) N/A 6.0 μg/m3 (25) 33.0
 
Sept. 17, 2020, 6 a.m. 60.4 ppb (57) 47.3 ppb (44) N/A 13.0 ppb (12) N/A N/A N/A 0.3 ppb (3) N/A 7.0 μg/m3 (29) 57.0
 
Sept. 17, 2020, 5 a.m. 56.8 ppb (53) 45.2 ppb (42) N/A 12.0 ppb (11) N/A N/A N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 53.0
 
Sept. 17, 2020, 4 a.m. 52.6 ppb (49) 40.5 ppb (38) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 49.0