AQSQID: 240270006

Site Name: Howard County Near Road

Location: Howard Co, MD

Reporting: True, Located: True

Current AQI: 29.0

Howard Co MD, US: 39.143197, -76.846192

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Sept. 15, 2019, 10 a.m. 21.2 ppb (20) 10.7 ppb (10) N/A 11.0 ppb (10) N/A N/A N/A 0.25 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 15, 2019, 9 a.m. 24.9 ppb (23) 12.2 ppb (11) N/A 13.0 ppb (12) N/A N/A N/A 0.29 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 15, 2019, 8 a.m. 23.2 ppb (21) 9.6 ppb (9) N/A 14.0 ppb (13) N/A N/A N/A 0.3 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 15, 2019, 7 a.m. 26.7 ppb (25) 11.0 ppb (10) N/A 16.0 ppb (15) N/A N/A N/A 0.33 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 15, 2019, 6 a.m. 24.1 ppb (22) 8.5 ppb (8) N/A 16.0 ppb (15) N/A N/A N/A 0.35 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 15, 2019, 5 a.m. 30.3 ppb (28) 13.5 ppb (12) N/A 17.0 ppb (16) N/A N/A N/A 0.38 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 15, 2019, 4 a.m. 26.1 ppb (24) 8.6 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
 
Sept. 15, 2019, 3 a.m. 24.7 ppb (23) 6.7 ppb (6) N/A 18.0 ppb (17) N/A N/A N/A 0.34 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 15, 2019, 2 a.m. 28.1 ppb (26) 8.1 ppb (8) N/A 20.0 ppb (19) N/A N/A N/A 0.36 ppb (4) N/A 4.0 μg/m3 (17) 26.0
 
Sept. 15, 2019, 1 a.m. 29.2 ppb (27) 8.4 ppb (8) N/A 21.0 ppb (19) N/A N/A N/A 0.39 ppb (4) N/A 6.0 μg/m3 (25) 27.0
 
Sept. 15, 2019, midnight 27.9 ppb (26) 7.8 ppb (7) N/A 20.0 ppb (19) N/A N/A N/A 0.38 ppb (4) N/A 5.0 μg/m3 (21) 26.0
 
Sept. 14, 2019, 11 p.m. 24.6 ppb (23) 6.1 ppb (6) N/A 19.0 ppb (18) N/A N/A N/A 0.37 ppb (4) N/A 4.0 μg/m3 (17) 23.0
 
Sept. 14, 2019, 10 p.m. 23.8 ppb (22) 6.2 ppb (6) N/A 18.0 ppb (17) N/A N/A N/A 0.38 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 14, 2019, 9 p.m. 23.0 ppb (21) 6.7 ppb (6) N/A 16.0 ppb (15) N/A N/A N/A 0.36 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 14, 2019, 8 p.m. 20.3 ppb (19) 5.3 ppb (5) N/A 15.0 ppb (14) N/A N/A N/A 0.35 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 14, 2019, 7 p.m. 21.3 ppb (20) 5.6 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A 0.35 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 14, 2019, 6 p.m. 19.1 ppb (18) 4.9 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A 0.32 ppb (4) N/A 4.0 μg/m3 (17) 18.0
 
Sept. 14, 2019, 5 p.m. 20.9 ppb (19) 5.3 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A 0.33 ppb (4) N/A 4.0 μg/m3 (17) 19.0
 
Sept. 14, 2019, 4 p.m. 23.2 ppb (21) 8.1 ppb (8) N/A 15.0 ppb (14) N/A N/A N/A 0.34 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 14, 2019, 3 p.m. 26.7 ppb (25) 12.5 ppb (12) N/A 14.0 ppb (13) N/A N/A N/A 0.34 ppb (4) N/A 4.0 μg/m3 (17) 25.0
 
Sept. 14, 2019, 2 p.m. 32.5 ppb (30) 17.9 ppb (17) N/A 15.0 ppb (14) N/A N/A N/A 0.33 ppb (4) N/A 3.0 μg/m3 (12) 30.0
 
Sept. 14, 2019, 1 p.m. 35.4 ppb (33) 21.8 ppb (20) N/A 14.0 ppb (13) N/A N/A N/A 0.33 ppb (4) N/A 6.0 μg/m3 (25) 33.0
 
Sept. 14, 2019, noon 40.7 ppb (38) 25.9 ppb (24) N/A 15.0 ppb (14) N/A N/A N/A 0.33 ppb (4) N/A 5.0 μg/m3 (21) 38.0
 
Sept. 14, 2019, 11 a.m. 50.8 ppb (47) 35.4 ppb (33) N/A 15.0 ppb (14) N/A N/A N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 47.0
 
Sept. 14, 2019, 10 a.m. 45.2 ppb (42) 29.3 ppb (27) N/A 16.0 ppb (15) N/A N/A N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 42.0
 
Sept. 14, 2019, 9 a.m. 53.6 ppb (50) 37.1 ppb (34) N/A 17.0 ppb (16) N/A N/A N/A 0.27 ppb (3) N/A 5.0 μg/m3 (21) 50.0
 
Sept. 14, 2019, 8 a.m. 38.0 ppb (35) 22.3 ppb (21) N/A 16.0 ppb (15) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 35.0
 
Sept. 14, 2019, 7 a.m. 30.3 ppb (28) 13.5 ppb (12) N/A 17.0 ppb (16) N/A N/A N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 28.0
 
Sept. 14, 2019, 6 a.m. 32.2 ppb (30) 14.3 ppb (13) N/A 18.0 ppb (17) N/A N/A N/A 0.26 ppb (3) N/A 4.0 μg/m3 (17) 30.0
 
Sept. 14, 2019, 5 a.m. 25.9 ppb (24) 9.3 ppb (9) N/A 17.0 ppb (16) N/A N/A N/A 0.24 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 14, 2019, 4 a.m. 22.7 ppb (21) 7.9 ppb (7) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 14, 2019, 3 a.m. 20.0 ppb (19) 6.4 ppb (6) N/A 14.0 ppb (13) N/A N/A N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 14, 2019, 2 a.m. 20.0 ppb (19) 7.1 ppb (7) N/A 13.0 ppb (12) N/A N/A N/A 0.28 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 14, 2019, 1 a.m. 20.1 ppb (19) 7.4 ppb (7) N/A 13.0 ppb (12) N/A N/A N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 14, 2019, midnight 20.9 ppb (19) 7.6 ppb (7) N/A 13.0 ppb (12) N/A N/A N/A 0.29 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 13, 2019, 11 p.m. 22.8 ppb (21) 8.2 ppb (8) N/A 15.0 ppb (14) N/A N/A N/A 0.3 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 13, 2019, 10 p.m. 22.8 ppb (21) 8.9 ppb (8) N/A 14.0 ppb (13) N/A N/A N/A 0.32 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 13, 2019, 9 p.m. 21.1 ppb (20) 7.3 ppb (7) N/A 14.0 ppb (13) N/A N/A N/A 0.3 ppb (3) N/A 3.0 μg/m3 (12) 20.0
 
Sept. 13, 2019, 8 p.m. 19.9 ppb (18) 7.2 ppb (7) N/A 13.0 ppb (12) N/A N/A N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 13, 2019, 7 p.m. 21.4 ppb (20) 8.3 ppb (8) N/A 13.0 ppb (12) N/A N/A N/A 0.29 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 13, 2019, 6 p.m. 25.1 ppb (23) 11.7 ppb (11) N/A 13.0 ppb (12) N/A N/A N/A 0.29 ppb (3) N/A 5.0 μg/m3 (21) 23.0
 
Sept. 13, 2019, 5 p.m. 24.4 ppb (23) 11.4 ppb (11) N/A 13.0 ppb (12) N/A N/A N/A 0.27 ppb (3) N/A 5.0 μg/m3 (21) 23.0
 
Sept. 13, 2019, 4 p.m. 28.0 ppb (26) 14.8 ppb (14) N/A 13.0 ppb (12) N/A N/A N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 26.0
 
Sept. 13, 2019, 3 p.m. 27.8 ppb (26) 14.8 ppb (14) N/A 13.0 ppb (12) N/A N/A N/A 0.28 ppb (3) N/A 6.0 μg/m3 (25) 26.0
 
Sept. 13, 2019, 2 p.m. 29.0 ppb (27) 16.7 ppb (15) N/A 12.0 ppb (11) N/A N/A N/A 0.26 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 13, 2019, 1 p.m. 31.4 ppb (29) 18.8 ppb (17) N/A 13.0 ppb (12) N/A N/A N/A 0.28 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 13, 2019, noon 29.6 ppb (27) 17.4 ppb (16) N/A 12.0 ppb (11) N/A N/A N/A 0.29 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 13, 2019, 11 a.m. 33.6 ppb (31) 20.6 ppb (19) N/A 13.0 ppb (12) N/A N/A N/A 0.32 ppb (4) N/A 7.0 μg/m3 (29) 31.0
 
Sept. 13, 2019, 10 a.m. 33.1 ppb (31) 19.8 ppb (18) N/A 13.0 ppb (12) N/A N/A N/A 0.32 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 13, 2019, 9 a.m. 24.8 ppb (23) 12.9 ppb (12) N/A 12.0 ppb (11) N/A N/A N/A 0.28 ppb (3) N/A 3.0 μg/m3 (12) 23.0
 
Sept. 13, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.21 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 13, 2019, 7 a.m. 16.7 ppb (15) 6.7 ppb (6) N/A 10.0 ppb (9) N/A N/A N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 13, 2019, 6 a.m. 15.3 ppb (14) 4.8 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 13, 2019, 5 a.m. 16.7 ppb (15) 5.3 ppb (5) N/A 11.0 ppb (10) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 13, 2019, 4 a.m. 16.5 ppb (15) 3.8 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 13, 2019, 3 a.m. 20.0 ppb (19) 4.8 ppb (4) 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
 
Sept. 13, 2019, 2 a.m. 20.2 ppb (19) 5.1 ppb (5) N/A 15.0 ppb (14) N/A N/A N/A 0.29 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 13, 2019, 1 a.m. 14.6 ppb (14) 2.0 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A 0.28 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 13, 2019, midnight 17.7 ppb (16) 4.2 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.28 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 12, 2019, 11 p.m. 8.6 ppb (8) 0.9 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 12, 2019, 10 p.m. 7.2 ppb (7) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 12, 2019, 9 p.m. 5.4 ppb (5) 0.3 ppb (0) 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. 12, 2019, 8 p.m. 9.2 ppb (9) 0.9 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.21 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 12, 2019, 7 p.m. 8.5 ppb (8) 1.2 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 12, 2019, 6 p.m. 7.8 ppb (7) 1.2 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 12, 2019, 5 p.m. 7.8 ppb (7) 1.2 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 12, 2019, 4 p.m. 8.5 ppb (8) 1.4 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 12, 2019, 3 p.m. 9.4 ppb (9) 1.3 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 12, 2019, 2 p.m. 12.5 ppb (12) 1.7 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.28 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
Sept. 12, 2019, 1 p.m. 24.2 ppb (22) 9.2 ppb (9) N/A 15.0 ppb (14) N/A N/A N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 12, 2019, noon 44.9 ppb (42) 25.1 ppb (23) N/A 20.0 ppb (19) N/A N/A N/A 0.44 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 12, 2019, 11 a.m. 24.0 ppb (22) 10.0 ppb (9) N/A 14.0 ppb (13) N/A N/A N/A 0.31 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 12, 2019, 10 a.m. 26.5 ppb (25) 10.6 ppb (10) N/A 16.0 ppb (15) N/A N/A N/A 0.29 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 12, 2019, 9 a.m. 37.3 ppb (35) 16.2 ppb (15) N/A 21.0 ppb (19) N/A N/A N/A 0.31 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 12, 2019, 8 a.m. 41.8 ppb (39) 21.2 ppb (20) N/A 21.0 ppb (19) N/A N/A N/A 0.28 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 12, 2019, 7 a.m. 34.1 ppb (32) 13.6 ppb (13) N/A 20.0 ppb (19) N/A N/A N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 12, 2019, 6 a.m. 21.8 ppb (20) 5.7 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A 0.27 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 12, 2019, 5 a.m. 13.9 ppb (13) 2.4 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.26 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 12, 2019, 4 a.m. 13.6 ppb (13) 1.4 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 12, 2019, 3 a.m. 17.8 ppb (16) 2.5 ppb (2) N/A 15.0 ppb (14) N/A N/A N/A 0.3 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 12, 2019, 2 a.m. 18.6 ppb (17) 2.6 ppb (2) N/A 16.0 ppb (15) N/A N/A N/A 0.32 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 12, 2019, 1 a.m. 17.0 ppb (16) 2.4 ppb (2) N/A 15.0 ppb (14) N/A N/A N/A 0.33 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 12, 2019, midnight 18.4 ppb (17) 2.1 ppb (2) N/A 16.0 ppb (15) N/A N/A N/A 0.33 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 11, 2019, 11 p.m. 16.5 ppb (15) 2.0 ppb (2) N/A 15.0 ppb (14) N/A N/A N/A 0.35 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 11, 2019, 10 p.m. 23.4 ppb (22) 3.0 ppb (3) N/A 20.0 ppb (19) N/A N/A N/A 0.4 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
Sept. 11, 2019, 9 p.m. 11.1 ppb (10) 1.8 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.3 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 11, 2019, 8 p.m. 7.8 ppb (7) 1.1 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 11, 2019, 7 p.m. 11.1 ppb (10) 1.8 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.27 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 11, 2019, 6 p.m. 13.0 ppb (12) 2.6 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.29 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 11, 2019, 5 p.m. 12.2 ppb (11) 2.2 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.29 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 11, 2019, 4 p.m. 14.5 ppb (13) 2.4 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.29 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 11, 2019, 3 p.m. 21.7 ppb (20) 4.7 ppb (4) N/A 17.0 ppb (16) N/A N/A N/A 0.33 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 11, 2019, 2 p.m. 27.3 ppb (25) 10.9 ppb (10) N/A 16.0 ppb (15) N/A N/A N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 11, 2019, 1 p.m. 40.7 ppb (38) 23.4 ppb (22) N/A 17.0 ppb (16) N/A N/A N/A 0.36 ppb (4) N/A 7.0 μg/m3 (29) 38.0
 
Sept. 11, 2019, noon 56.7 ppb (53) 36.9 ppb (34) N/A 20.0 ppb (19) N/A N/A N/A 0.46 ppb (5) N/A 8.0 μg/m3 (33) 53.0
 
Sept. 11, 2019, 11 a.m. 57.8 ppb (54) 39.3 ppb (36) N/A 18.0 ppb (17) N/A N/A N/A 0.48 ppb (5) N/A 12.0 μg/m3 (50) 54.0
 
Sept. 11, 2019, 10 a.m. 56.0 ppb (52) 36.3 ppb (34) N/A 20.0 ppb (19) N/A N/A N/A 0.43 ppb (5) N/A 9.0 μg/m3 (38) 52.0
 
Sept. 11, 2019, 9 a.m. 55.0 ppb (51) 36.2 ppb (34) N/A 19.0 ppb (18) N/A N/A N/A 0.38 ppb (4) N/A 7.0 μg/m3 (29) 51.0
 
Sept. 11, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.3 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 11, 2019, 7 a.m. 44.9 ppb (42) 24.0 ppb (22) N/A 21.0 ppb (19) N/A N/A N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 42.0
 
Sept. 11, 2019, 6 a.m. 41.6 ppb (39) 19.3 ppb (18) N/A 22.0 ppb (20) N/A N/A N/A 0.26 ppb (3) N/A 8.0 μg/m3 (33) 39.0
 
Sept. 11, 2019, 5 a.m. 49.5 ppb (46) 24.5 ppb (23) N/A 25.0 ppb (23) N/A N/A N/A 0.28 ppb (3) N/A 7.0 μg/m3 (29) 46.0
 
Sept. 11, 2019, 4 a.m. 38.2 ppb (35) 14.8 ppb (14) N/A 23.0 ppb (21) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 35.0
 
Sept. 11, 2019, 3 a.m. 37.4 ppb (35) 14.7 ppb (14) N/A 23.0 ppb (21) N/A N/A N/A 0.32 ppb (4) N/A 6.0 μg/m3 (25) 35.0
 
Sept. 11, 2019, 2 a.m. 36.4 ppb (34) 12.3 ppb (11) N/A 24.0 ppb (22) N/A N/A N/A 0.33 ppb (4) N/A 7.0 μg/m3 (29) 34.0
 
Sept. 11, 2019, 1 a.m. 38.2 ppb (35) 12.2 ppb (11) N/A 26.0 ppb (24) N/A N/A N/A 0.34 ppb (4) N/A 8.0 μg/m3 (33) 35.0
 
Sept. 11, 2019, midnight 35.0 ppb (32) 10.9 ppb (10) N/A 24.0 ppb (22) N/A N/A N/A 0.37 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 10, 2019, 11 p.m. 33.5 ppb (31) 9.9 ppb (9) N/A 24.0 ppb (22) N/A N/A N/A 0.37 ppb (4) N/A 7.0 μg/m3 (29) 31.0
 
Sept. 10, 2019, 10 p.m. 31.0 ppb (29) 8.9 ppb (8) N/A 22.0 ppb (20) N/A N/A N/A 0.37 ppb (4) N/A 6.0 μg/m3 (25) 29.0
 
Sept. 10, 2019, 9 p.m. 32.0 ppb (30) 9.1 ppb (8) N/A 23.0 ppb (21) N/A N/A N/A 0.37 ppb (4) N/A 6.0 μg/m3 (25) 30.0
 
Sept. 10, 2019, 8 p.m. 28.5 ppb (26) 7.0 ppb (6) N/A 21.0 ppb (19) N/A N/A N/A 0.34 ppb (4) N/A 6.0 μg/m3 (25) 26.0
 
Sept. 10, 2019, 7 p.m. 29.7 ppb (28) 7.4 ppb (7) N/A 22.0 ppb (20) N/A N/A N/A 0.35 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 10, 2019, 6 p.m. 29.3 ppb (27) 7.9 ppb (7) N/A 21.0 ppb (19) N/A N/A N/A 0.32 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 10, 2019, 5 p.m. 30.9 ppb (29) 9.4 ppb (9) N/A 21.0 ppb (19) N/A N/A N/A 0.28 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 10, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A N/A 0.28 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 10, 2019, 3 p.m. 38.7 ppb (36) 15.9 ppb (15) N/A 23.0 ppb (21) N/A N/A N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 10, 2019, 2 p.m. 47.3 ppb (44) 25.9 ppb (24) N/A 21.0 ppb (19) N/A N/A N/A 0.35 ppb (4) N/A 9.0 μg/m3 (38) 44.0
 
Sept. 10, 2019, 1 p.m. 55.5 ppb (52) 34.4 ppb (32) N/A 21.0 ppb (19) N/A N/A N/A 0.41 ppb (5) N/A 9.0 μg/m3 (38) 52.0
 
Sept. 10, 2019, noon 68.0 ppb (65) 45.7 ppb (42) N/A 22.0 ppb (20) N/A N/A N/A 0.46 ppb (5) N/A 12.0 μg/m3 (50) 65.0
 
Sept. 10, 2019, 11 a.m. 68.0 ppb (65) 51.0 ppb (47) N/A 17.0 ppb (16) N/A N/A N/A 0.39 ppb (4) N/A 7.0 μg/m3 (29) 65.0
 
Sept. 10, 2019, 10 a.m. 43.9 ppb (41) 31.0 ppb (29) N/A 13.0 ppb (12) N/A N/A N/A 0.33 ppb (4) N/A 3.0 μg/m3 (12) 41.0
 
Sept. 10, 2019, 9 a.m. 64.6 ppb (61) 48.9 ppb (45) N/A 16.0 ppb (15) N/A N/A N/A 0.37 ppb (4) N/A 4.0 μg/m3 (17) 61.0
 
Sept. 10, 2019, 8 a.m. 59.1 ppb (55) 42.0 ppb (39) N/A 17.0 ppb (16) N/A N/A N/A 0.31 ppb (3) N/A 8.0 μg/m3 (33) 55.0
 
Sept. 10, 2019, 7 a.m. 62.2 ppb (59) 43.2 ppb (40) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 59.0
 
Sept. 10, 2019, 6 a.m. 57.2 ppb (53) 34.9 ppb (32) N/A 22.0 ppb (20) N/A N/A N/A 0.32 ppb (4) N/A 8.0 μg/m3 (33) 53.0
 
Sept. 10, 2019, 5 a.m. 49.2 ppb (46) 25.9 ppb (24) N/A 23.0 ppb (21) N/A N/A N/A 0.32 ppb (4) N/A 7.0 μg/m3 (29) 46.0
 
Sept. 10, 2019, 4 a.m. 60.1 ppb (56) 35.6 ppb (33) N/A 24.0 ppb (22) N/A N/A N/A 0.35 ppb (4) N/A 8.0 μg/m3 (33) 56.0
 
Sept. 10, 2019, 3 a.m. 40.3 ppb (37) 19.4 ppb (18) N/A 21.0 ppb (19) N/A N/A N/A 0.27 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 10, 2019, 2 a.m. 45.8 ppb (42) 21.3 ppb (20) N/A 24.0 ppb (22) N/A N/A N/A 0.28 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 10, 2019, 1 a.m. 43.1 ppb (40) 14.6 ppb (14) N/A 28.0 ppb (26) N/A N/A N/A 0.29 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 10, 2019, midnight 45.9 ppb (42) 13.0 ppb (12) N/A 33.0 ppb (31) N/A N/A N/A 0.31 ppb (3) N/A 9.0 μg/m3 (38) 42.0
 
Sept. 9, 2019, 11 p.m. 32.4 ppb (30) 5.7 ppb (5) N/A 27.0 ppb (25) N/A N/A N/A 0.33 ppb (4) N/A 6.0 μg/m3 (25) 30.0
 
Sept. 9, 2019, 10 p.m. 29.1 ppb (27) 6.2 ppb (6) N/A 23.0 ppb (21) N/A N/A N/A 0.34 ppb (4) N/A 6.0 μg/m3 (25) 27.0
 
Sept. 9, 2019, 9 p.m. 27.5 ppb (25) 6.1 ppb (6) N/A 21.0 ppb (19) N/A N/A N/A 0.34 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 9, 2019, 8 p.m. 31.6 ppb (29) 7.7 ppb (7) N/A 24.0 ppb (22) N/A N/A N/A 0.32 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 9, 2019, 7 p.m. 24.4 ppb (23) 5.1 ppb (5) N/A 19.0 ppb (18) N/A N/A N/A 0.27 ppb (3) N/A 5.0 μg/m3 (21) 23.0
 
Sept. 9, 2019, 6 p.m. 27.5 ppb (25) 7.9 ppb (7) N/A 20.0 ppb (19) N/A N/A N/A 0.27 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 9, 2019, 5 p.m. 27.3 ppb (25) 7.3 ppb (7) N/A 20.0 ppb (19) N/A N/A N/A 0.27 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 9, 2019, 4 p.m. 35.0 ppb (32) 10.6 ppb (10) N/A 24.0 ppb (22) N/A N/A N/A 0.29 ppb (3) N/A N/A 32.0
 
Sept. 9, 2019, 3 p.m. 38.5 ppb (36) 12.9 ppb (12) N/A 26.0 ppb (24) N/A N/A N/A 0.31 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 9, 2019, 2 p.m. 45.2 ppb (42) 20.7 ppb (19) N/A 24.0 ppb (22) N/A N/A N/A 0.36 ppb (4) N/A 7.0 μg/m3 (29) 42.0
 
Sept. 9, 2019, 1 p.m. 57.9 ppb (54) 32.7 ppb (30) N/A 25.0 ppb (23) N/A N/A N/A 0.43 ppb (5) N/A N/A 54.0
 
Sept. 9, 2019, noon 43.8 ppb (41) 25.3 ppb (23) N/A 19.0 ppb (18) N/A N/A N/A 0.42 ppb (5) N/A 9.0 μg/m3 (38) 41.0
 
Sept. 9, 2019, 11 a.m. 23.3 ppb (22) 10.9 ppb (10) N/A 12.0 ppb (11) N/A N/A N/A 0.29 ppb (3) N/A 5.0 μg/m3 (21) 22.0
 
Sept. 9, 2019, 10 a.m. 31.8 ppb (29) 19.1 ppb (18) N/A 13.0 ppb (12) N/A N/A N/A 0.3 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 9, 2019, 9 a.m. 25.2 ppb (23) 14.0 ppb (13) N/A 11.0 ppb (10) N/A N/A N/A 0.3 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 9, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.28 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 9, 2019, 7 a.m. 20.1 ppb (19) 9.1 ppb (8) N/A 11.0 ppb (10) N/A N/A N/A 0.26 ppb (3) N/A 4.0 μg/m3 (17) 19.0
 
Sept. 9, 2019, 6 a.m. 18.8 ppb (17) 7.8 ppb (7) N/A 11.0 ppb (10) N/A N/A N/A 0.29 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 9, 2019, 5 a.m. 20.9 ppb (19) 7.6 ppb (7) N/A 13.0 ppb (12) N/A N/A N/A 0.3 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 9, 2019, 4 a.m. 20.0 ppb (19) 5.7 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Sept. 9, 2019, 3 a.m. 27.4 ppb (25) 7.5 ppb (7) N/A 20.0 ppb (19) N/A N/A N/A 0.34 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 9, 2019, 2 a.m. 31.4 ppb (29) 7.9 ppb (7) N/A 24.0 ppb (22) N/A N/A N/A 0.34 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 9, 2019, 1 a.m. 34.0 ppb (31) 7.7 ppb (7) N/A 26.0 ppb (24) N/A N/A N/A 0.34 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 9, 2019, midnight 30.1 ppb (28) 6.6 ppb (6) N/A 23.0 ppb (21) N/A N/A N/A 0.35 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 8, 2019, 11 p.m. 20.5 ppb (19) 3.1 ppb (3) N/A 17.0 ppb (16) N/A N/A N/A 0.26 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 8, 2019, 10 p.m. 6.5 ppb (6) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.19 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 8, 2019, 9 p.m. 7.2 ppb (7) 1.3 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 8, 2019, 8 p.m. 5.5 ppb (5) 1.1 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 8, 2019, 7 p.m. 4.7 ppb (4) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 8, 2019, 6 p.m. 4.2 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Sept. 8, 2019, 5 p.m. 6.2 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 8, 2019, 4 p.m. 9.5 ppb (9) 2.5 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 8, 2019, 3 p.m. 10.2 ppb (9) 2.2 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 8, 2019, 2 p.m. 13.2 ppb (12) 3.4 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 8, 2019, 1 p.m. 15.6 ppb (14) 6.1 ppb (6) N/A 9.0 ppb (8) N/A N/A N/A 0.24 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 8, 2019, noon 24.6 ppb (23) 15.1 ppb (14) N/A 10.0 ppb (9) N/A N/A N/A 0.32 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 8, 2019, 11 a.m. 21.7 ppb (20) 12.4 ppb (11) N/A 9.0 ppb (8) N/A N/A N/A 0.26 ppb (3) N/A 8.0 μg/m3 (33) 33.0