AQSQID: 240270006

Site Name: Howard County Near Road

Location: Howard Co, MD

Reporting: True, Located: True

Current AQI: 46.0

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
July 21, 2019, 9 a.m. 13.3 ppb (12) 2.9 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.24 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 21, 2019, 8 a.m. 12.0 ppb (11) 1.9 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.23 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
July 21, 2019, 7 a.m. 16.2 ppb (15) 4.4 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A 0.23 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 21, 2019, 6 a.m. 12.5 ppb (12) 2.7 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.23 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
July 21, 2019, 5 a.m. 13.4 ppb (12) 2.2 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.24 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 21, 2019, 4 a.m. 16.4 ppb (15) 4.3 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 52.0
 
July 21, 2019, 3 a.m. 15.4 ppb (14) 4.3 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.29 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
July 21, 2019, 2 a.m. 12.9 ppb (12) 2.6 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.29 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
July 21, 2019, 1 a.m. 8.0 ppb (7) 1.8 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 17.0 μg/m3 (61) 61.0
 
July 21, 2019, midnight 4.8 ppb (4) 0.9 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.23 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
July 20, 2019, 11 p.m. 4.7 ppb (4) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.24 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
July 20, 2019, 10 p.m. 3.4 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.23 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 20, 2019, 9 p.m. 3.7 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.22 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
July 20, 2019, 8 p.m. 3.9 ppb (4) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.22 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
July 20, 2019, 7 p.m. 3.5 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.22 ppb (2) N/A 16.0 μg/m3 (59) 59.0
 
July 20, 2019, 6 p.m. 5.6 ppb (5) 1.1 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.24 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 20, 2019, 5 p.m. 5.9 ppb (5) 1.2 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.25 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
July 20, 2019, 4 p.m. 5.9 ppb (5) 1.2 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.23 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
July 20, 2019, 3 p.m. 5.2 ppb (5) 0.8 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.22 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
July 20, 2019, 2 p.m. 7.4 ppb (7) 1.2 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 16.0 μg/m3 (59) 59.0
 
July 20, 2019, 1 p.m. 9.3 ppb (9) 1.2 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
July 20, 2019, noon 16.4 ppb (15) 5.1 ppb (5) N/A 11.0 ppb (10) N/A N/A N/A 0.28 ppb (3) N/A 17.0 μg/m3 (61) 61.0
 
July 20, 2019, 11 a.m. 33.2 ppb (31) 17.6 ppb (16) N/A 16.0 ppb (15) N/A N/A N/A 0.3 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
July 20, 2019, 10 a.m. 36.1 ppb (33) 18.3 ppb (17) N/A 18.0 ppb (17) N/A N/A N/A 0.26 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
July 20, 2019, 9 a.m. 30.8 ppb (29) 14.6 ppb (14) N/A 16.0 ppb (15) N/A N/A N/A 0.24 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 20, 2019, 8 a.m. 35.4 ppb (33) 18.5 ppb (17) N/A 17.0 ppb (16) N/A N/A N/A 0.25 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 20, 2019, 7 a.m. 43.5 ppb (40) 26.3 ppb (24) N/A 17.0 ppb (16) N/A N/A N/A 0.27 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 20, 2019, 6 a.m. 43.3 ppb (40) 23.2 ppb (21) N/A 20.0 ppb (19) N/A N/A N/A 0.28 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 20, 2019, 5 a.m. 33.5 ppb (31) 15.1 ppb (14) N/A 18.0 ppb (17) N/A N/A N/A 0.28 ppb (3) N/A 6.0 μg/m3 (25) 31.0
 
July 20, 2019, 4 a.m. 20.6 ppb (19) 6.0 ppb (6) N/A 15.0 ppb (14) N/A N/A N/A 0.24 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 20, 2019, 3 a.m. 22.7 ppb (21) 7.2 ppb (7) N/A 15.0 ppb (14) N/A N/A N/A 0.23 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 20, 2019, 2 a.m. 19.8 ppb (18) 5.7 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A 0.23 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 20, 2019, 1 a.m. 20.4 ppb (19) 4.8 ppb (4) N/A 16.0 ppb (15) N/A N/A N/A 0.23 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
July 20, 2019, midnight 18.5 ppb (17) 3.6 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.21 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
July 19, 2019, 11 p.m. 15.0 ppb (14) 2.7 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.2 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
July 19, 2019, 10 p.m. 12.9 ppb (12) 2.4 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.18 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
July 19, 2019, 9 p.m. 11.4 ppb (11) 1.9 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.2 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
July 19, 2019, 8 p.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
July 19, 2019, 7 p.m. 7.1 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 19, 2019, 6 p.m. 8.9 ppb (8) 2.2 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.3 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 19, 2019, 5 p.m. 8.1 ppb (8) 1.7 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.46 ppb (5) N/A 15.0 μg/m3 (56) 56.0
 
July 19, 2019, 4 p.m. 8.7 ppb (8) 1.9 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.37 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
July 19, 2019, 3 p.m. 7.5 ppb (7) 1.4 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
July 19, 2019, 2 p.m. 11.6 ppb (11) 2.9 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.21 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
July 19, 2019, 1 p.m. 13.2 ppb (12) 3.0 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.21 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
July 19, 2019, noon 24.3 ppb (23) 12.6 ppb (12) N/A 12.0 ppb (11) N/A N/A N/A 0.28 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
July 19, 2019, 11 a.m. 44.5 ppb (41) 30.3 ppb (28) N/A 14.0 ppb (13) N/A N/A N/A 0.35 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
July 19, 2019, 10 a.m. 39.0 ppb (36) 27.2 ppb (25) N/A 12.0 ppb (11) N/A N/A N/A 0.31 ppb (3) N/A 8.0 μg/m3 (33) 36.0
 
July 19, 2019, 9 a.m. 44.3 ppb (41) 31.4 ppb (29) N/A 13.0 ppb (12) N/A N/A N/A 0.32 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
July 19, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.31 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
July 19, 2019, 7 a.m. 31.8 ppb (29) 19.8 ppb (18) N/A 12.0 ppb (11) N/A N/A N/A 0.26 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 19, 2019, 6 a.m. 30.8 ppb (29) 20.1 ppb (19) N/A 11.0 ppb (10) N/A N/A N/A 0.3 ppb (3) N/A 6.0 μg/m3 (25) 29.0
 
July 19, 2019, 5 a.m. 25.2 ppb (23) 15.5 ppb (14) N/A 10.0 ppb (9) N/A N/A N/A 0.29 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
July 19, 2019, 4 a.m. 26.7 ppb (25) 13.9 ppb (13) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
July 19, 2019, 3 a.m. 19.9 ppb (18) 5.6 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A 0.34 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
July 19, 2019, 2 a.m. 22.0 ppb (20) 7.2 ppb (7) N/A 15.0 ppb (14) N/A N/A N/A 0.31 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
July 19, 2019, 1 a.m. 11.5 ppb (11) 2.6 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.26 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 19, 2019, midnight 11.9 ppb (11) 2.5 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.21 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
July 18, 2019, 11 p.m. 12.2 ppb (11) 2.4 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
July 18, 2019, 10 p.m. 8.8 ppb (8) 1.3 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
July 18, 2019, 9 p.m. 8.6 ppb (8) 1.7 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
July 18, 2019, 8 p.m. 6.1 ppb (6) 1.3 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.19 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
July 18, 2019, 7 p.m. 6.9 ppb (6) 1.4 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
 
July 18, 2019, 6 p.m. 11.4 ppb (11) 2.4 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
July 18, 2019, 5 p.m. 11.8 ppb (11) 3.9 ppb (4) 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
 
July 18, 2019, 4 p.m. 7.9 ppb (7) 1.9 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
July 18, 2019, 3 p.m. 11.3 ppb (10) 3.1 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.19 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
July 18, 2019, 2 p.m. 14.9 ppb (14) 4.7 ppb (4) 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
 
July 18, 2019, 1 p.m. 20.8 ppb (19) 9.7 ppb (9) N/A 11.0 ppb (10) N/A N/A N/A 0.27 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
July 18, 2019, noon 30.6 ppb (28) 20.9 ppb (19) N/A 10.0 ppb (9) N/A N/A N/A 0.35 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
July 18, 2019, 11 a.m. 49.6 ppb (46) 39.9 ppb (37) N/A 10.0 ppb (9) N/A N/A N/A 0.43 ppb (5) N/A 12.0 μg/m3 (50) 50.0
 
July 18, 2019, 10 a.m. 49.1 ppb (45) 39.3 ppb (36) N/A 10.0 ppb (9) N/A N/A N/A 0.41 ppb (5) N/A 9.0 μg/m3 (38) 45.0
 
July 18, 2019, 9 a.m. 50.6 ppb (47) 40.3 ppb (37) N/A 10.0 ppb (9) N/A N/A N/A 0.38 ppb (4) N/A 8.0 μg/m3 (33) 47.0
 
July 18, 2019, 8 a.m. 55.7 ppb (52) 44.0 ppb (41) N/A 12.0 ppb (11) N/A N/A N/A 0.38 ppb (4) N/A 7.0 μg/m3 (29) 52.0
 
July 18, 2019, 7 a.m. 59.1 ppb (55) 45.6 ppb (42) N/A 14.0 ppb (13) N/A N/A N/A 0.39 ppb (4) N/A 8.0 μg/m3 (33) 55.0
 
July 18, 2019, 6 a.m. 54.9 ppb (51) 41.1 ppb (38) N/A 14.0 ppb (13) N/A N/A N/A 0.38 ppb (4) N/A 9.0 μg/m3 (38) 51.0
 
July 18, 2019, 5 a.m. 51.0 ppb (47) 37.2 ppb (34) N/A 14.0 ppb (13) N/A N/A N/A 0.37 ppb (4) N/A 5.0 μg/m3 (21) 47.0
 
July 18, 2019, 4 a.m. 58.5 ppb (55) 42.8 ppb (40) N/A 16.0 ppb (15) N/A N/A N/A 0.53 ppb (6) N/A 7.0 μg/m3 (29) 55.0
 
July 18, 2019, 1 a.m. 31.0 ppb (29) 14.3 ppb (13) N/A 17.0 ppb (16) N/A N/A N/A 0.32 ppb (4) N/A 6.0 μg/m3 (25) 29.0
 
July 18, 2019, midnight 34.3 ppb (32) 13.8 ppb (13) N/A 20.0 ppb (19) N/A N/A N/A 0.34 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
July 17, 2019, 11 p.m. 32.9 ppb (30) 12.2 ppb (11) 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
 
July 17, 2019, 10 p.m. 24.9 ppb (23) 8.5 ppb (8) N/A 16.0 ppb (15) N/A N/A N/A 0.3 ppb (3) N/A 4.0 μg/m3 (17) 23.0
 
July 17, 2019, 9 p.m. 21.8 ppb (20) 4.3 ppb (4) N/A 17.0 ppb (16) N/A N/A N/A 0.38 ppb (4) N/A 18.0 μg/m3 (63) 63.0
 
July 17, 2019, 8 p.m. 25.7 ppb (24) 7.1 ppb (7) N/A 19.0 ppb (18) N/A N/A N/A 0.37 ppb (4) N/A 20.0 μg/m3 (67) 67.0
 
July 17, 2019, 7 p.m. 27.9 ppb (26) 7.0 ppb (6) N/A 21.0 ppb (19) N/A N/A N/A 0.35 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
July 17, 2019, 6 p.m. 21.5 ppb (20) 5.8 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A 0.28 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
July 17, 2019, 5 p.m. 11.7 ppb (11) 2.9 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.21 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
July 17, 2019, 4 p.m. 11.9 ppb (11) 2.8 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.22 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
July 17, 2019, 3 p.m. 16.6 ppb (15) 3.5 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.28 ppb (3) N/A 16.0 μg/m3 (59) 59.0
 
July 17, 2019, 2 p.m. 25.3 ppb (23) 5.8 ppb (5) N/A 20.0 ppb (19) N/A N/A N/A 0.34 ppb (4) N/A 18.0 μg/m3 (63) 63.0
 
July 17, 2019, 1 p.m. 30.8 ppb (29) 10.4 ppb (10) N/A 20.0 ppb (19) N/A N/A N/A 0.38 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
July 17, 2019, noon 48.0 ppb (44) 29.1 ppb (27) N/A 19.0 ppb (18) N/A N/A N/A 0.45 ppb (5) N/A 18.0 μg/m3 (63) 63.0
 
July 17, 2019, 11 a.m. 74.7 ppb (72) 54.8 ppb (51) N/A 20.0 ppb (19) N/A N/A N/A 0.53 ppb (6) N/A 20.0 μg/m3 (67) 72.0
 
July 17, 2019, 10 a.m. 77.4 ppb (75) 59.7 ppb (56) N/A 18.0 ppb (17) N/A N/A N/A 0.54 ppb (6) N/A 16.0 μg/m3 (59) 75.0
 
July 17, 2019, 9 a.m. 73.0 ppb (70) 55.5 ppb (52) N/A 18.0 ppb (17) N/A N/A N/A 0.47 ppb (5) N/A 17.0 μg/m3 (61) 70.0
 
July 17, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.38 ppb (4) N/A 18.0 μg/m3 (63) 63.0
 
July 17, 2019, 7 a.m. 31.9 ppb (30) 16.5 ppb (15) N/A 15.0 ppb (14) N/A N/A N/A 0.28 ppb (3) N/A 17.0 μg/m3 (61) 61.0
 
July 17, 2019, 6 a.m. 41.6 ppb (39) 24.3 ppb (23) N/A 17.0 ppb (16) N/A N/A N/A 0.3 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 17, 2019, 5 a.m. 53.1 ppb (49) 32.6 ppb (30) N/A 21.0 ppb (19) N/A N/A N/A 0.33 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
July 17, 2019, 4 a.m. 44.5 ppb (41) 22.8 ppb (21) N/A 22.0 ppb (20) N/A N/A N/A 0.31 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
July 17, 2019, 3 a.m. 43.8 ppb (41) 20.3 ppb (19) N/A 24.0 ppb (22) N/A N/A N/A 0.28 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 17, 2019, 2 a.m. 37.8 ppb (35) 13.0 ppb (12) N/A 25.0 ppb (23) N/A N/A N/A 0.28 ppb (3) N/A 17.0 μg/m3 (61) 61.0
 
July 17, 2019, 1 a.m. 32.9 ppb (30) 9.3 ppb (9) N/A 24.0 ppb (22) N/A N/A N/A 0.29 ppb (3) N/A 17.0 μg/m3 (61) 61.0
 
July 17, 2019, midnight 33.6 ppb (31) 8.8 ppb (8) N/A 25.0 ppb (23) N/A N/A N/A 0.4 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
July 16, 2019, 11 p.m. 23.7 ppb (22) 6.5 ppb (6) N/A 17.0 ppb (16) N/A N/A N/A 0.35 ppb (4) N/A 19.0 μg/m3 (65) 65.0
 
July 16, 2019, 10 p.m. 8.0 ppb (7) 0.9 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 16.0 μg/m3 (59) 59.0
 
July 16, 2019, 9 p.m. 8.5 ppb (8) 0.5 ppb (0) N/A 8.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
July 16, 2019, 8 p.m. 18.9 ppb (18) 2.6 ppb (2) N/A 16.0 ppb (15) N/A N/A N/A 0.31 ppb (3) N/A 16.0 μg/m3 (59) 59.0
 
July 16, 2019, 7 p.m. 14.4 ppb (13) 1.5 ppb (1) N/A 13.0 ppb (12) N/A N/A N/A 0.27 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
July 16, 2019, 6 p.m. 20.2 ppb (19) 4.1 ppb (4) N/A 16.0 ppb (15) N/A N/A N/A 0.28 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
July 16, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A N/A 0.22 ppb (2) N/A N/A 2.0
 
July 16, 2019, 4 p.m. 17.4 ppb (16) 2.4 ppb (2) N/A 15.0 ppb (14) N/A N/A N/A 0.26 ppb (3) N/A 16.0 μg/m3 (59) 59.0
 
July 16, 2019, 3 p.m. 32.8 ppb (30) 6.0 ppb (6) N/A 27.0 ppb (25) N/A N/A N/A 0.34 ppb (4) N/A 19.0 μg/m3 (65) 65.0
 
July 16, 2019, 2 p.m. 44.1 ppb (41) 13.1 ppb (12) N/A 31.0 ppb (29) N/A N/A N/A 0.38 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
July 16, 2019, 1 p.m. 51.5 ppb (48) 24.7 ppb (23) N/A 27.0 ppb (25) N/A N/A N/A 0.41 ppb (5) N/A 13.0 μg/m3 (52) 52.0
 
July 16, 2019, noon 48.8 ppb (45) 29.8 ppb (28) N/A 19.0 ppb (18) N/A N/A N/A 0.43 ppb (5) N/A 17.0 μg/m3 (61) 61.0
 
July 16, 2019, 11 a.m. 37.5 ppb (35) 26.6 ppb (25) N/A 11.0 ppb (10) N/A N/A N/A 0.35 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
July 16, 2019, 10 a.m. 33.8 ppb (31) 24.4 ppb (23) N/A 9.0 ppb (8) N/A N/A N/A 0.34 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
July 16, 2019, 9 a.m. 32.3 ppb (30) 22.1 ppb (20) N/A 10.0 ppb (9) N/A N/A N/A 0.31 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 16, 2019, 8 a.m. 36.1 ppb (33) 25.1 ppb (23) N/A 11.0 ppb (10) N/A N/A N/A 0.33 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
July 16, 2019, 7 a.m. 43.0 ppb (40) 28.7 ppb (27) N/A 14.0 ppb (13) N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 52.0
 
July 16, 2019, 6 a.m. 45.4 ppb (42) 28.1 ppb (26) N/A 17.0 ppb (16) N/A N/A N/A 0.32 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
July 16, 2019, 5 a.m. 50.6 ppb (47) 29.4 ppb (27) N/A 21.0 ppb (19) N/A N/A N/A 0.33 ppb (4) N/A 10.0 μg/m3 (42) 47.0
 
July 16, 2019, 4 a.m. 57.7 ppb (54) 30.8 ppb (29) N/A 27.0 ppb (25) N/A N/A N/A 0.34 ppb (4) N/A 10.0 μg/m3 (42) 54.0
 
July 16, 2019, 3 a.m. 55.2 ppb (51) 23.5 ppb (22) N/A 32.0 ppb (30) N/A N/A N/A 0.38 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
July 16, 2019, 2 a.m. 46.4 ppb (43) 12.8 ppb (12) N/A 34.0 ppb (31) N/A N/A N/A 0.38 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
July 16, 2019, 1 a.m. 41.5 ppb (38) 9.6 ppb (9) N/A 32.0 ppb (30) N/A N/A N/A 0.33 ppb (4) N/A 8.0 μg/m3 (33) 38.0
 
July 16, 2019, midnight 39.5 ppb (37) 10.3 ppb (10) N/A 29.0 ppb (27) N/A N/A N/A 0.27 ppb (3) N/A 7.0 μg/m3 (29) 37.0
 
July 15, 2019, 11 p.m. 31.6 ppb (29) 10.2 ppb (9) N/A 21.0 ppb (19) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 29.0
 
July 15, 2019, 10 p.m. 16.1 ppb (15) 3.8 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
July 15, 2019, 9 p.m. 12.6 ppb (12) 1.9 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
July 15, 2019, 8 p.m. 9.6 ppb (9) 1.7 ppb (2) 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
 
July 15, 2019, 7 p.m. 10.1 ppb (9) 1.8 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
July 15, 2019, 6 p.m. 11.5 ppb (11) 2.7 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
July 15, 2019, 5 p.m. 8.5 ppb (8) 1.2 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.19 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
July 15, 2019, 4 p.m. 12.9 ppb (12) 3.0 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
July 15, 2019, 3 p.m. 22.8 ppb (21) 5.9 ppb (5) N/A 17.0 ppb (16) N/A N/A N/A 0.27 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 15, 2019, 2 p.m. 36.1 ppb (33) 13.1 ppb (12) N/A 23.0 ppb (21) N/A N/A N/A 0.33 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
July 15, 2019, 1 p.m. 44.7 ppb (41) 20.4 ppb (19) N/A 24.0 ppb (22) N/A N/A N/A 0.33 ppb (4) N/A 9.0 μg/m3 (38) 41.0
 
July 15, 2019, noon 46.0 ppb (43) 23.6 ppb (22) N/A 22.0 ppb (20) N/A N/A N/A 0.35 ppb (4) N/A 9.0 μg/m3 (38) 43.0
 
July 15, 2019, 11 a.m. 32.9 ppb (30) 16.7 ppb (15) 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
 
July 15, 2019, 10 a.m. 36.2 ppb (34) 20.0 ppb (19) N/A 16.0 ppb (15) N/A N/A N/A 0.28 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
July 15, 2019, 9 a.m. 30.4 ppb (28) 14.4 ppb (13) N/A 16.0 ppb (15) N/A N/A N/A 0.25 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 15, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.23 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 15, 2019, 7 a.m. 12.7 ppb (12) 2.8 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.19 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
July 15, 2019, 6 a.m. 16.3 ppb (15) 3.5 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
July 15, 2019, 5 a.m. 17.1 ppb (16) 2.7 ppb (3) N/A 14.0 ppb (13) N/A N/A N/A 0.23 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
July 15, 2019, 4 a.m. 19.9 ppb (18) 4.0 ppb (4) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
July 15, 2019, 3 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 11.0 μg/m3 (46) 46.0
 
July 15, 2019, 2 a.m. 10.9 ppb (10) 1.2 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A 0.25 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
July 15, 2019, 1 a.m. 11.8 ppb (11) 1.1 ppb (1) N/A 11.0 ppb (10) N/A N/A N/A 0.24 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 15, 2019, midnight 8.2 ppb (8) 0.7 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
July 14, 2019, 11 p.m. 10.3 ppb (10) 1.4 ppb (1) 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
 
July 14, 2019, 10 p.m. 5.7 ppb (5) 0.6 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.22 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
July 14, 2019, 9 p.m. 5.7 ppb (5) 0.7 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
July 14, 2019, 8 p.m. 3.6 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
July 14, 2019, 7 p.m. 4.2 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
July 14, 2019, 6 p.m. 4.3 ppb (4) 0.5 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.22 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
July 14, 2019, 5 p.m. 3.9 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.22 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
July 14, 2019, 4 p.m. 3.9 ppb (4) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.23 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 14, 2019, 3 p.m. 3.9 ppb (4) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.22 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
July 14, 2019, 2 p.m. 4.2 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.22 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
July 14, 2019, 1 p.m. 6.2 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.23 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
July 14, 2019, noon 9.2 ppb (9) 1.2 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
 
July 14, 2019, 11 a.m. 20.0 ppb (19) 9.7 ppb (9) N/A 10.0 ppb (9) N/A N/A N/A 0.28 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
July 14, 2019, 10 a.m. 29.0 ppb (27) 16.3 ppb (15) N/A 13.0 ppb (12) N/A N/A N/A 0.31 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 14, 2019, 9 a.m. 17.2 ppb (16) 7.0 ppb (6) 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
 
July 14, 2019, 8 a.m. 14.2 ppb (13) 3.6 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A 0.3 ppb (3) N/A 9.0 μg/m3 (38) 38.0