AQSQID: 240270006

Site Name: Howard County Near Road

Location: Howard Co, MD

Reporting: False, Located: True

Current AQI: None

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
May 21, 2019, 3 p.m. 9.7 ppb (9) 2.7 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A N/A 9.0
 
May 21, 2019, 2 p.m. 11.2 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A N/A 10.0
 
May 21, 2019, 1 p.m. 10.6 ppb (10) 2.7 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A N/A N/A N/A 10.0
 
May 21, 2019, noon 13.2 ppb (12) 3.6 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A N/A 12.0
 
May 21, 2019, 11 a.m. 17.1 ppb (16) 5.0 ppb (5) N/A 12.0 ppb (11) N/A N/A N/A 0.17 ppb (2) N/A 2.0 μg/m3 (8) 16.0
 
May 21, 2019, 10 a.m. 27.2 ppb (25) 11.8 ppb (11) N/A 15.0 ppb (14) N/A N/A N/A 0.19 ppb (2) N/A 3.0 μg/m3 (12) 25.0
 
May 21, 2019, 9 a.m. 30.4 ppb (28) 12.3 ppb (11) N/A 18.0 ppb (17) N/A N/A N/A 0.2 ppb (2) N/A 2.0 μg/m3 (8) 28.0
 
May 21, 2019, 8 a.m. 21.1 ppb (20) 6.5 ppb (6) N/A 15.0 ppb (14) N/A N/A N/A 0.14 ppb (2) N/A 1.0 μg/m3 (4) 20.0
 
May 21, 2019, 7 a.m. 14.5 ppb (13) 2.7 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 13.0
 
May 21, 2019, 6 a.m. 18.7 ppb (17) 3.5 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.15 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
May 21, 2019, 5 a.m. 25.5 ppb (24) 6.4 ppb (6) N/A 19.0 ppb (18) N/A N/A N/A 0.14 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
May 21, 2019, 4 a.m. 24.7 ppb (23) 5.8 ppb (5) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 23.0
 
May 21, 2019, 3 a.m. 19.9 ppb (18) 3.1 ppb (3) N/A 17.0 ppb (16) N/A N/A N/A 0.15 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
May 21, 2019, 2 a.m. 21.1 ppb (20) 3.6 ppb (3) N/A 17.0 ppb (16) N/A N/A N/A 0.16 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
May 21, 2019, 1 a.m. 26.3 ppb (24) 6.0 ppb (6) N/A 20.0 ppb (19) N/A N/A N/A 0.19 ppb (2) N/A 5.0 μg/m3 (21) 24.0
 
May 21, 2019, midnight 24.0 ppb (22) 5.2 ppb (5) N/A 19.0 ppb (18) N/A N/A N/A 0.18 ppb (2) N/A 3.0 μg/m3 (12) 22.0
 
May 20, 2019, 11 p.m. 15.9 ppb (15) 3.2 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.19 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
May 20, 2019, 10 p.m. 11.5 ppb (11) 1.9 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
May 20, 2019, 9 p.m. 11.1 ppb (10) 2.1 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.18 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
May 20, 2019, 8 p.m. 10.3 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.15 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
May 20, 2019, 7 p.m. 11.5 ppb (11) 2.5 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.15 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
May 20, 2019, 6 p.m. 15.5 ppb (14) 3.9 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
May 20, 2019, 5 p.m. 15.0 ppb (14) 3.7 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
May 20, 2019, 4 p.m. 16.0 ppb (15) 2.9 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.15 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, 3 p.m. 26.2 ppb (24) 5.9 ppb (5) N/A 20.0 ppb (19) N/A N/A N/A 0.23 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
May 20, 2019, 2 p.m. 34.1 ppb (32) 9.6 ppb (9) N/A 24.0 ppb (22) N/A N/A N/A 0.23 ppb (3) N/A N/A 32.0
 
May 20, 2019, 1 p.m. 34.2 ppb (32) 11.5 ppb (11) N/A 23.0 ppb (21) N/A N/A N/A 0.25 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
May 20, 2019, noon 35.1 ppb (32) 13.2 ppb (12) N/A 22.0 ppb (20) N/A N/A N/A 0.26 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
May 20, 2019, 11 a.m. 41.0 ppb (38) 18.1 ppb (17) N/A 23.0 ppb (21) N/A N/A N/A 0.26 ppb (3) N/A 17.0 μg/m3 (61) 61.0
 
May 20, 2019, 10 a.m. 43.5 ppb (40) 16.6 ppb (15) N/A 27.0 ppb (25) N/A N/A N/A 0.27 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
May 20, 2019, 9 a.m. 43.8 ppb (41) 15.5 ppb (14) N/A 28.0 ppb (26) N/A N/A N/A 0.28 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.21 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, 7 a.m. 28.9 ppb (27) 6.6 ppb (6) N/A 22.0 ppb (20) N/A N/A N/A 0.18 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
May 20, 2019, 6 a.m. 30.9 ppb (29) 7.4 ppb (7) N/A 23.0 ppb (21) N/A N/A N/A 0.22 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, 5 a.m. 29.3 ppb (27) 6.3 ppb (6) N/A 23.0 ppb (21) N/A N/A N/A 0.24 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
May 20, 2019, 4 a.m. 37.6 ppb (35) 9.7 ppb (9) N/A 28.0 ppb (26) N/A N/A N/A 0.29 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, 3 a.m. 36.3 ppb (34) 8.9 ppb (8) N/A 27.0 ppb (25) N/A N/A N/A 0.32 ppb (4) N/A 19.0 μg/m3 (65) 65.0
 
May 20, 2019, 2 a.m. 35.9 ppb (33) 9.1 ppb (8) N/A 27.0 ppb (25) N/A N/A N/A 0.35 ppb (4) N/A 21.0 μg/m3 (69) 69.0
 
May 20, 2019, 1 a.m. 30.8 ppb (29) 7.6 ppb (7) N/A 23.0 ppb (21) N/A N/A N/A 0.35 ppb (4) N/A 18.0 μg/m3 (63) 63.0
 
May 20, 2019, midnight 24.9 ppb (23) 5.3 ppb (5) N/A 20.0 ppb (19) N/A N/A N/A 0.35 ppb (4) N/A 17.0 μg/m3 (61) 61.0
 
May 19, 2019, 11 p.m. 22.2 ppb (21) 5.0 ppb (5) N/A 17.0 ppb (16) N/A N/A N/A 0.32 ppb (4) N/A 20.0 μg/m3 (67) 67.0
 
May 19, 2019, 10 p.m. 16.1 ppb (15) 3.2 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.28 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
May 19, 2019, 9 p.m. 18.2 ppb (17) 4.2 ppb (4) N/A 14.0 ppb (13) N/A N/A N/A 0.27 ppb (3) N/A 17.0 μg/m3 (61) 61.0
 
May 19, 2019, 8 p.m. 15.5 ppb (14) 3.7 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.26 ppb (3) N/A 18.0 μg/m3 (63) 63.0
 
May 19, 2019, 7 p.m. 14.8 ppb (14) 3.3 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A 0.26 ppb (3) N/A 16.0 μg/m3 (59) 59.0
 
May 19, 2019, 6 p.m. 15.4 ppb (14) 3.3 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.27 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
May 19, 2019, 5 p.m. 15.5 ppb (14) 3.2 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.26 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
May 19, 2019, 4 p.m. 13.6 ppb (13) 2.7 ppb (3) 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
 
May 19, 2019, 3 p.m. 15.7 ppb (15) 3.4 ppb (3) 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
 
May 19, 2019, 2 p.m. 17.3 ppb (16) 4.6 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.29 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
May 19, 2019, 1 p.m. 16.7 ppb (15) 4.1 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.25 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
May 19, 2019, noon 21.6 ppb (20) 7.6 ppb (7) N/A 14.0 ppb (13) N/A N/A N/A 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
May 19, 2019, 11 a.m. 32.0 ppb (30) 16.5 ppb (15) N/A 16.0 ppb (15) N/A N/A N/A 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
May 19, 2019, 10 a.m. 33.0 ppb (31) 17.2 ppb (16) 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
 
May 19, 2019, 9 a.m. 24.9 ppb (23) 8.7 ppb (8) N/A 16.0 ppb (15) N/A N/A N/A 0.2 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
May 19, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.18 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
May 19, 2019, 7 a.m. 17.7 ppb (16) 2.8 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.18 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
May 19, 2019, 6 a.m. 19.7 ppb (18) 3.7 ppb (3) N/A 16.0 ppb (15) N/A N/A N/A 0.17 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
May 19, 2019, 5 a.m. 21.9 ppb (20) 4.3 ppb (4) N/A 18.0 ppb (17) N/A N/A N/A 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
May 19, 2019, 4 a.m. 26.5 ppb (25) 5.7 ppb (5) N/A 21.0 ppb (19) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
May 19, 2019, 3 a.m. 25.0 ppb (23) 5.9 ppb (5) N/A 19.0 ppb (18) N/A N/A N/A 0.53 ppb (6) N/A 13.0 μg/m3 (52) 52.0
 
May 19, 2019, 2 a.m. 26.1 ppb (24) 5.9 ppb (5) N/A 20.0 ppb (19) N/A N/A N/A 0.6 ppb (7) N/A 11.0 μg/m3 (46) 46.0
 
May 19, 2019, 1 a.m. 20.1 ppb (19) 3.7 ppb (3) N/A 16.0 ppb (15) N/A N/A N/A 0.52 ppb (6) N/A 15.0 μg/m3 (56) 56.0
 
May 19, 2019, midnight 19.0 ppb (18) 3.1 ppb (3) N/A 16.0 ppb (15) N/A N/A N/A 0.56 ppb (6) N/A 14.0 μg/m3 (54) 54.0
 
May 18, 2019, 11 p.m. 19.0 ppb (18) 3.9 ppb (4) N/A 15.0 ppb (14) N/A N/A N/A 0.56 ppb (6) N/A 15.0 μg/m3 (56) 56.0
 
May 18, 2019, 10 p.m. 18.0 ppb (17) 3.9 ppb (4) N/A 14.0 ppb (13) N/A N/A N/A 0.53 ppb (6) N/A 11.0 μg/m3 (46) 46.0
 
May 18, 2019, 9 p.m. 20.0 ppb (19) 4.2 ppb (4) N/A 16.0 ppb (15) N/A N/A N/A 0.51 ppb (6) N/A 10.0 μg/m3 (42) 42.0
 
May 18, 2019, 8 p.m. 21.9 ppb (20) 4.7 ppb (4) N/A 17.0 ppb (16) N/A N/A N/A 0.52 ppb (6) N/A 12.0 μg/m3 (50) 50.0
 
May 18, 2019, 7 p.m. 19.1 ppb (18) 4.3 ppb (4) N/A 15.0 ppb (14) N/A N/A N/A 0.48 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
May 18, 2019, 6 p.m. 19.0 ppb (18) 4.8 ppb (4) N/A 14.0 ppb (13) N/A N/A N/A 0.48 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
May 18, 2019, 5 p.m. 16.0 ppb (15) 3.7 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.46 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
May 18, 2019, 4 p.m. 17.3 ppb (16) 3.9 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.29 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
May 18, 2019, 3 p.m. 21.7 ppb (20) 6.5 ppb (6) N/A 15.0 ppb (14) N/A N/A N/A 0.28 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
May 18, 2019, 2 p.m. 24.0 ppb (22) 7.9 ppb (7) 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
 
May 18, 2019, 1 p.m. 27.4 ppb (25) 10.5 ppb (10) N/A 17.0 ppb (16) N/A N/A N/A 0.28 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
May 18, 2019, noon 31.2 ppb (29) 15.8 ppb (15) N/A 15.0 ppb (14) N/A N/A N/A 0.29 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
May 18, 2019, 11 a.m. 30.5 ppb (28) 17.5 ppb (16) N/A 13.0 ppb (12) N/A N/A N/A 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
May 18, 2019, 10 a.m. 50.6 ppb (47) 31.4 ppb (29) N/A 19.0 ppb (18) N/A N/A N/A 0.29 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
May 18, 2019, 9 a.m. 29.8 ppb (28) 13.5 ppb (12) N/A 16.0 ppb (15) N/A N/A N/A 0.2 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
May 18, 2019, 8 a.m. 27.4 ppb (25) 10.3 ppb (10) N/A 17.0 ppb (16) N/A N/A N/A 0.18 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
May 18, 2019, 7 a.m. 30.9 ppb (29) 12.0 ppb (11) N/A 19.0 ppb (18) N/A N/A N/A 0.18 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
May 18, 2019, 6 a.m. 25.4 ppb (24) 8.2 ppb (8) N/A 17.0 ppb (16) N/A N/A N/A 0.18 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
May 18, 2019, 5 a.m. 19.3 ppb (18) 3.7 ppb (3) N/A 16.0 ppb (15) N/A N/A N/A 0.2 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
May 18, 2019, 4 a.m. 18.7 ppb (17) 3.4 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.18 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
May 18, 2019, 3 a.m. 19.1 ppb (18) 3.9 ppb (4) N/A 15.0 ppb (14) N/A N/A N/A 0.0 ppb (0) N/A 9.0 μg/m3 (38) 38.0
 
May 18, 2019, 2 a.m. 18.3 ppb (17) 4.0 ppb (4) N/A 14.0 ppb (13) N/A N/A N/A 0.01 ppb (0) N/A 9.0 μg/m3 (38) 38.0
 
May 18, 2019, 1 a.m. 15.1 ppb (14) 2.8 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.05 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
May 18, 2019, midnight 16.2 ppb (15) 2.9 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.1 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
May 17, 2019, 11 p.m. 11.7 ppb (11) 1.8 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.22 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
May 17, 2019, 10 p.m. 8.5 ppb (8) 1.3 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.56 ppb (6) N/A 5.0 μg/m3 (21) 21.0
 
May 17, 2019, 9 p.m. 10.1 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 1.34 ppb (15) N/A 4.0 μg/m3 (17) 17.0
 
May 17, 2019, 8 p.m. 18.4 ppb (17) 6.7 ppb (6) N/A 12.0 ppb (11) N/A N/A N/A 1.94 ppb (22) N/A 6.0 μg/m3 (25) 25.0
 
May 17, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A N/A 0.17 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
May 17, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A N/A 0.14 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
May 17, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A N/A 0.17 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
May 17, 2019, 4 p.m. 29.7 ppb (28) 9.3 ppb (9) N/A 20.0 ppb (19) N/A N/A N/A 0.32 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
May 17, 2019, 3 p.m. 38.1 ppb (35) 14.9 ppb (14) N/A 23.0 ppb (21) N/A N/A N/A 0.4 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
May 17, 2019, 2 p.m. 36.6 ppb (34) 16.4 ppb (15) N/A 20.0 ppb (19) N/A N/A N/A 0.4 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
May 17, 2019, 1 p.m. 44.2 ppb (41) 24.2 ppb (22) N/A 20.0 ppb (19) N/A N/A N/A 0.31 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
May 17, 2019, noon 60.4 ppb (57) 38.3 ppb (35) N/A 22.0 ppb (20) N/A N/A N/A 0.38 ppb (4) N/A 10.0 μg/m3 (42) 57.0
 
May 17, 2019, 11 a.m. 63.2 ppb (60) 40.5 ppb (38) N/A 23.0 ppb (21) N/A N/A N/A 0.34 ppb (4) N/A 11.0 μg/m3 (46) 60.0
 
May 17, 2019, 10 a.m. 76.3 ppb (74) 55.8 ppb (52) N/A 21.0 ppb (19) N/A N/A N/A 0.34 ppb (4) N/A 17.0 μg/m3 (61) 74.0
 
May 17, 2019, 9 a.m. 68.6 ppb (66) 47.6 ppb (44) N/A 21.0 ppb (19) N/A N/A N/A 0.32 ppb (4) N/A 12.0 μg/m3 (50) 66.0
 
May 17, 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
 
May 17, 2019, 7 a.m. 53.9 ppb (50) 31.5 ppb (29) N/A 22.0 ppb (20) N/A N/A N/A 0.28 ppb (3) N/A 11.0 μg/m3 (46) 50.0
 
May 17, 2019, 6 a.m. 59.6 ppb (56) 31.5 ppb (29) N/A 28.0 ppb (26) N/A N/A N/A 0.32 ppb (4) N/A 12.0 μg/m3 (50) 56.0
 
May 17, 2019, 5 a.m. 70.8 ppb (68) 37.9 ppb (35) N/A 33.0 ppb (31) N/A N/A N/A 0.36 ppb (4) N/A 13.0 μg/m3 (52) 68.0
 
May 17, 2019, 4 a.m. 62.9 ppb (59) 28.1 ppb (26) N/A 35.0 ppb (32) N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 59.0
 
May 17, 2019, 3 a.m. 60.1 ppb (56) 23.6 ppb (22) N/A 37.0 ppb (34) N/A N/A N/A 0.51 ppb (6) N/A 15.0 μg/m3 (56) 56.0
 
May 17, 2019, 2 a.m. 52.1 ppb (48) 17.0 ppb (16) N/A 35.0 ppb (32) N/A N/A N/A 0.45 ppb (5) N/A 14.0 μg/m3 (54) 54.0
 
May 17, 2019, 1 a.m. 46.4 ppb (43) 14.5 ppb (13) N/A 32.0 ppb (30) N/A N/A N/A 0.45 ppb (5) N/A 10.0 μg/m3 (42) 43.0
 
May 17, 2019, midnight 34.3 ppb (32) 11.9 ppb (11) N/A 22.0 ppb (20) N/A N/A N/A 0.33 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
May 16, 2019, 11 p.m. 14.0 ppb (13) 2.2 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.25 ppb (3) N/A 3.0 μg/m3 (12) 13.0
 
May 16, 2019, 10 p.m. 13.1 ppb (12) 2.2 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.18 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 16, 2019, 9 p.m. 10.6 ppb (10) 1.7 ppb (2) 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
 
May 16, 2019, 8 p.m. 9.6 ppb (9) 1.9 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.21 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
May 16, 2019, 7 p.m. 9.7 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.21 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
May 16, 2019, 6 p.m. 9.0 ppb (8) 1.8 ppb (2) 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
 
May 16, 2019, 5 p.m. 11.4 ppb (11) 1.9 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
May 16, 2019, 4 p.m. 15.5 ppb (14) 3.6 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.22 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
May 16, 2019, 3 p.m. 12.4 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 16, 2019, 2 p.m. 23.8 ppb (22) 7.8 ppb (7) N/A 16.0 ppb (15) N/A N/A N/A 0.26 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 16, 2019, 1 p.m. 25.3 ppb (23) 9.5 ppb (9) N/A 16.0 ppb (15) N/A N/A N/A 0.25 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
May 16, 2019, noon 30.7 ppb (28) 12.2 ppb (11) N/A 19.0 ppb (18) N/A N/A N/A 0.21 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
May 16, 2019, 11 a.m. 27.3 ppb (25) 8.8 ppb (8) N/A 18.0 ppb (17) N/A N/A N/A 0.18 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
May 16, 2019, 10 a.m. 34.2 ppb (32) 15.0 ppb (14) N/A 19.0 ppb (18) N/A N/A N/A 0.18 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
May 16, 2019, 9 a.m. 52.3 ppb (48) 24.1 ppb (22) N/A 28.0 ppb (26) N/A N/A N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 48.0
 
May 16, 2019, 8 a.m. 50.7 ppb (47) 22.0 ppb (20) N/A 29.0 ppb (27) N/A N/A N/A 0.15 ppb (2) N/A 9.0 μg/m3 (38) 47.0
 
May 16, 2019, 7 a.m. 41.9 ppb (39) 16.4 ppb (15) N/A 26.0 ppb (24) N/A N/A N/A 0.13 ppb (1) N/A 9.0 μg/m3 (38) 39.0
 
May 16, 2019, 6 a.m. 47.3 ppb (44) 23.9 ppb (22) N/A 23.0 ppb (21) N/A N/A N/A 0.12 ppb (1) N/A 10.0 μg/m3 (42) 44.0
 
May 16, 2019, 5 a.m. 44.4 ppb (41) 20.2 ppb (19) N/A 24.0 ppb (22) N/A N/A N/A 0.14 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
May 16, 2019, 4 a.m. 45.8 ppb (42) 23.2 ppb (21) N/A 23.0 ppb (21) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 42.0
 
May 16, 2019, 3 a.m. 34.8 ppb (32) 17.6 ppb (16) N/A 17.0 ppb (16) N/A N/A N/A 0.06 ppb (1) N/A 3.0 μg/m3 (12) 32.0
 
May 16, 2019, 2 a.m. 45.5 ppb (42) 21.4 ppb (20) N/A 24.0 ppb (22) N/A N/A N/A 0.07 ppb (1) N/A 4.0 μg/m3 (17) 42.0
 
May 16, 2019, 1 a.m. 31.2 ppb (29) 10.5 ppb (10) N/A 21.0 ppb (19) N/A N/A N/A 0.09 ppb (1) N/A 4.0 μg/m3 (17) 29.0
 
May 16, 2019, midnight 35.4 ppb (33) 11.6 ppb (11) N/A 24.0 ppb (22) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 33.0
 
May 15, 2019, 11 p.m. 19.3 ppb (18) 5.2 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 18.0
 
May 15, 2019, 10 p.m. 13.2 ppb (12) 3.4 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.19 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
May 15, 2019, 9 p.m. 9.0 ppb (8) 1.7 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.16 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
May 15, 2019, 8 p.m. 12.4 ppb (11) 2.8 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
May 15, 2019, 7 p.m. 9.9 ppb (9) 2.2 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.15 ppb (2) N/A 2.0 μg/m3 (8) 9.0
 
May 15, 2019, 6 p.m. 7.9 ppb (7) 1.7 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.15 ppb (2) N/A 0.0 μg/m3 (0) 7.0
 
May 15, 2019, 5 p.m. 8.6 ppb (8) 1.9 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.16 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
May 15, 2019, 4 p.m. 10.4 ppb (10) 2.7 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.19 ppb (2) N/A 2.0 μg/m3 (8) 10.0
 
May 15, 2019, 3 p.m. 9.4 ppb (9) 2.1 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.19 ppb (2) N/A 1.0 μg/m3 (4) 9.0
 
May 15, 2019, 2 p.m. 10.9 ppb (10) 2.6 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.19 ppb (2) N/A 1.0 μg/m3 (4) 10.0
 
May 15, 2019, 1 p.m. 12.1 ppb (11) 2.5 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.19 ppb (2) N/A 1.0 μg/m3 (4) 11.0
 
May 15, 2019, noon 17.7 ppb (16) 6.3 ppb (6) N/A 11.0 ppb (10) N/A N/A N/A 0.23 ppb (3) N/A 2.0 μg/m3 (8) 16.0
 
May 15, 2019, 11 a.m. 20.5 ppb (19) 8.3 ppb (8) N/A 12.0 ppb (11) N/A N/A N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 19.0
 
May 15, 2019, 10 a.m. 35.1 ppb (32) 18.3 ppb (17) N/A 17.0 ppb (16) N/A N/A N/A 0.29 ppb (3) N/A 3.0 μg/m3 (12) 32.0
 
May 15, 2019, 9 a.m. 42.8 ppb (40) 22.7 ppb (21) N/A 20.0 ppb (19) N/A N/A N/A 0.29 ppb (3) N/A 2.0 μg/m3 (8) 40.0
 
May 15, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A 0.28 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 15, 2019, 7 a.m. 23.1 ppb (21) 8.0 ppb (7) N/A 15.0 ppb (14) N/A N/A N/A 0.18 ppb (2) N/A 3.0 μg/m3 (12) 21.0
 
May 15, 2019, 6 a.m. 18.2 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (11) N/A N/A N/A 0.2 ppb (2) N/A 3.0 μg/m3 (12) 17.0
 
May 15, 2019, 5 a.m. 22.5 ppb (21) 8.3 ppb (8) N/A 14.0 ppb (13) N/A N/A N/A 0.2 ppb (2) N/A 3.0 μg/m3 (12) 21.0
 
May 15, 2019, 4 a.m. 29.4 ppb (27) 12.6 ppb (12) N/A 17.0 ppb (16) N/A N/A N/A 0.22 ppb (2) N/A 5.0 μg/m3 (21) 27.0
 
May 15, 2019, 3 a.m. 27.1 ppb (25) 10.8 ppb (10) N/A 16.0 ppb (15) N/A N/A N/A 0.08 ppb (1) N/A 2.0 μg/m3 (8) 25.0
 
May 15, 2019, 2 a.m. 17.7 ppb (16) 5.3 ppb (5) N/A 12.0 ppb (11) N/A N/A N/A 0.07 ppb (1) N/A 1.0 μg/m3 (4) 16.0
 
May 15, 2019, 1 a.m. 13.4 ppb (12) 3.5 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.09 ppb (1) N/A 2.0 μg/m3 (8) 12.0
 
May 15, 2019, midnight 11.8 ppb (11) 3.0 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.2 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 14, 2019, 11 p.m. 10.0 ppb (9) 2.7 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 14, 2019, 10 p.m. 8.4 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 14, 2019, 9 p.m. 7.9 ppb (7) 1.9 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
May 14, 2019, 8 p.m. 6.8 ppb (6) 1.5 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.15 ppb (2) N/A 1.0 μg/m3 (4) 6.0
 
May 14, 2019, 7 p.m. 6.5 ppb (6) 1.7 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.13 ppb (1) N/A -1.0 μg/m3 (0) 6.0
 
May 14, 2019, 6 p.m. 6.4 ppb (6) 1.9 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.13 ppb (1) N/A -2.0 μg/m3 (0) 6.0
 
May 14, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A N/A 0.21 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
May 14, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A N/A 0.2 ppb (2) N/A -4.0 μg/m3 (0) 2.0