AQSQID: 295100094

Site Name: Forest Park

Location: St. Louis (No. 2), MO

Reporting: True, Located: True

Current AQI: 118.0

St. Louis (No. 2) MO, US: 38.631057, -90.281144

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 18, 2019, noon 193.5 ppb (118) 138.2 ppb (107) N/A 58.0 ppb (54) N/A N/A N/A 0.84 ppb (9) N/A 13.8 μg/m3 (54) 118.0
 
March 18, 2019, 11 a.m. 83.9 ppb (82) 43.5 ppb (40) N/A 43.0 ppb (40) N/A N/A N/A 0.5 ppb (6) N/A 10.6 μg/m3 (44) 82.0
 
March 18, 2019, 10 a.m. 52.9 ppb (49) 14.6 ppb (14) N/A 38.0 ppb (35) N/A N/A N/A 0.49 ppb (5) N/A 6.2 μg/m3 (26) 49.0
 
March 18, 2019, 9 a.m. 61.9 ppb (58) 23.5 ppb (22) N/A 38.0 ppb (35) N/A N/A N/A 0.57 ppb (6) N/A 15.1 μg/m3 (57) 58.0
 
March 18, 2019, 8 a.m. 60.1 ppb (56) 21.7 ppb (20) N/A 39.0 ppb (36) N/A N/A N/A 0.52 ppb (6) N/A 14.0 μg/m3 (54) 56.0
 
March 18, 2019, 7 a.m. 59.6 ppb (56) 20.6 ppb (19) N/A 39.0 ppb (36) N/A N/A N/A 0.56 ppb (6) N/A 16.3 μg/m3 (59) 59.0
 
March 18, 2019, 6 a.m. 58.8 ppb (55) 20.4 ppb (19) N/A 39.0 ppb (36) N/A N/A N/A 0.55 ppb (6) N/A 14.3 μg/m3 (55) 55.0
 
March 18, 2019, 5 a.m. 44.5 ppb (41) 8.1 ppb (8) N/A 36.0 ppb (33) N/A N/A N/A 0.52 ppb (6) N/A 10.3 μg/m3 (43) 43.0
 
March 18, 2019, 4 a.m. 24.1 ppb (22) 0.8 ppb (1) N/A 23.0 ppb (21) N/A N/A N/A 0.34 ppb (4) N/A 11.3 μg/m3 (47) 47.0
 
March 18, 2019, 3 a.m. 15.3 ppb (14) 0.8 ppb (1) N/A 15.0 ppb (14) N/A N/A N/A 0.28 ppb (3) N/A 11.5 μg/m3 (48) 48.0
 
March 18, 2019, 2 a.m. 13.5 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A 0.37 ppb (4) N/A 5.9 μg/m3 (25) 25.0
 
March 18, 2019, 1 a.m. 7.4 ppb (7) 0.7 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.27 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
March 18, 2019, midnight 4.4 ppb (4) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 11 p.m. 2.4 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.19 ppb (2) N/A 3.7 μg/m3 (15) 15.0
 
March 17, 2019, 10 p.m. 2.1 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 6.2 μg/m3 (26) 26.0
 
March 17, 2019, 9 p.m. 1.8 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 8.1 μg/m3 (34) 34.0
 
March 17, 2019, 8 p.m. 3.1 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.2 ppb (2) N/A 5.8 μg/m3 (24) 24.0
 
March 17, 2019, 7 p.m. 1.8 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 3.9 μg/m3 (16) 16.0
 
March 17, 2019, 6 p.m. 2.3 ppb (2) 0.9 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 6.6 μg/m3 (28) 28.0
 
March 17, 2019, 5 p.m. 2.3 ppb (2) 0.9 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 7.4 μg/m3 (31) 31.0
 
March 17, 2019, 4 p.m. 3.4 ppb (3) 1.5 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (2) N/A 4.5 μg/m3 (19) 19.0
 
March 17, 2019, 3 p.m. 2.5 ppb (2) 1.1 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 6.2 μg/m3 (26) 26.0
 
March 17, 2019, 2 p.m. 3.0 ppb (3) 1.2 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.19 ppb (2) N/A 5.5 μg/m3 (23) 23.0
 
March 17, 2019, 1 p.m. 3.9 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (2) N/A 9.1 μg/m3 (38) 38.0
 
March 17, 2019, noon 7.2 ppb (7) 1.2 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 4.2 μg/m3 (18) 18.0
 
March 17, 2019, 11 a.m. 8.6 ppb (8) 1.1 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.2 ppb (2) N/A 3.7 μg/m3 (15) 15.0
 
March 17, 2019, 10 a.m. 10.3 ppb (10) 2.4 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 5.7 μg/m3 (24) 24.0
 
March 17, 2019, 9 a.m. 10.8 ppb (10) 1.6 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.24 ppb (3) N/A 1.1 μg/m3 (5) 10.0
 
March 17, 2019, 8 a.m. 10.5 ppb (10) 1.5 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.22 ppb (2) N/A 6.3 μg/m3 (26) 26.0
 
March 17, 2019, 7 a.m. 19.0 ppb (18) 2.4 ppb (2) N/A 17.0 ppb (16) N/A N/A N/A 0.25 ppb (3) N/A 9.2 μg/m3 (38) 38.0
 
March 17, 2019, 6 a.m. 16.6 ppb (15) 2.2 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A 0.27 ppb (3) N/A 10.7 μg/m3 (45) 45.0
 
March 17, 2019, 5 a.m. 13.7 ppb (13) 2.5 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.26 ppb (3) N/A 7.7 μg/m3 (32) 32.0
 
March 17, 2019, 4 a.m. 27.1 ppb (25) 5.1 ppb (5) N/A 22.0 ppb (20) N/A N/A N/A 0.36 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 17, 2019, 3 a.m. 26.2 ppb (24) 5.8 ppb (5) N/A 20.0 ppb (19) N/A N/A N/A 0.41 ppb (5) N/A 6.5 μg/m3 (27) 27.0
 
March 17, 2019, 2 a.m. 48.7 ppb (45) 11.6 ppb (11) N/A 37.0 ppb (34) N/A N/A N/A 0.51 ppb (6) N/A 8.2 μg/m3 (34) 45.0
 
March 17, 2019, 1 a.m. 27.5 ppb (25) 7.0 ppb (6) N/A 21.0 ppb (19) N/A N/A N/A 0.39 ppb (4) N/A 7.8 μg/m3 (32) 32.0
 
March 17, 2019, midnight 3.2 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (2) N/A -1.3 μg/m3 (0) 3.0
 
March 16, 2019, 11 p.m. 2.6 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.19 ppb (2) N/A 2.1 μg/m3 (9) 9.0
 
March 16, 2019, 10 p.m. 1.7 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 16, 2019, 9 p.m. 2.8 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.17 ppb (2) N/A -3.3 μg/m3 (0) 3.0
 
March 16, 2019, 8 p.m. 2.1 ppb (2) 0.9 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A 1.2 μg/m3 (5) 5.0
 
March 16, 2019, 7 p.m. 2.5 ppb (2) 1.1 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 3.4 μg/m3 (14) 14.0
 
March 16, 2019, 6 p.m. 2.4 ppb (2) 0.9 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A 2.9 μg/m3 (12) 12.0
 
March 16, 2019, 5 p.m. 3.0 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 16, 2019, 4 p.m. 5.6 ppb (5) 2.2 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.2 ppb (2) N/A 5.4 μg/m3 (23) 23.0
 
March 16, 2019, 3 p.m. 5.2 ppb (5) 1.8 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (2) N/A 4.1 μg/m3 (17) 17.0
 
March 16, 2019, 2 p.m. 6.4 ppb (6) 1.9 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.21 ppb (2) N/A 3.2 μg/m3 (13) 13.0
 
March 16, 2019, 1 p.m. 12.3 ppb (11) 3.0 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 5.1 μg/m3 (21) 21.0
 
March 16, 2019, noon 35.2 ppb (33) 8.9 ppb (8) N/A 26.0 ppb (24) N/A N/A N/A 0.33 ppb (4) N/A 5.9 μg/m3 (25) 33.0
 
March 16, 2019, 11 a.m. 21.5 ppb (20) 4.3 ppb (4) N/A 17.0 ppb (16) N/A N/A N/A 0.28 ppb (3) N/A 2.3 μg/m3 (10) 20.0
 
March 16, 2019, 10 a.m. 12.3 ppb (11) 1.0 ppb (1) N/A 11.0 ppb (10) N/A N/A N/A 0.26 ppb (3) N/A 4.2 μg/m3 (18) 18.0
 
March 16, 2019, 9 a.m. 10.5 ppb (10) 0.8 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A 0.21 ppb (2) N/A 4.1 μg/m3 (17) 17.0
 
March 16, 2019, 8 a.m. 9.2 ppb (9) 0.7 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.22 ppb (2) N/A 4.4 μg/m3 (18) 18.0
 
March 16, 2019, 7 a.m. 9.4 ppb (9) 0.7 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.2 ppb (2) N/A 0.2 μg/m3 (1) 9.0
 
March 16, 2019, 6 a.m. 19.1 ppb (18) 3.0 ppb (3) N/A 16.0 ppb (15) N/A N/A N/A 0.3 ppb (3) N/A 3.5 μg/m3 (15) 18.0
 
March 16, 2019, 5 a.m. 22.0 ppb (20) 4.3 ppb (4) N/A 18.0 ppb (17) N/A N/A N/A 0.3 ppb (3) N/A 1.6 μg/m3 (7) 20.0
 
March 16, 2019, 4 a.m. 20.9 ppb (19) 3.6 ppb (3) N/A 17.0 ppb (16) N/A N/A N/A 0.34 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 16, 2019, 3 a.m. 22.0 ppb (20) 4.7 ppb (4) N/A 17.0 ppb (16) N/A N/A N/A 0.35 ppb (4) N/A 0.6 μg/m3 (2) 20.0
 
March 16, 2019, 2 a.m. 21.1 ppb (20) 5.2 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A 0.32 ppb (4) N/A 2.1 μg/m3 (9) 20.0
 
March 16, 2019, 1 a.m. 3.5 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 16, 2019, midnight 2.4 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.17 ppb (2) N/A -0.1 μg/m3 (0) 2.0
 
March 15, 2019, 11 p.m. 1.9 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
March 15, 2019, 10 p.m. 1.6 ppb (1) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A -1.4 μg/m3 (0) 2.0
 
March 15, 2019, 9 p.m. 2.2 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A 0.4 μg/m3 (2) 2.0
 
March 15, 2019, 8 p.m. 4.4 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.17 ppb (2) N/A 0.5 μg/m3 (2) 4.0
 
March 15, 2019, 7 p.m. 8.9 ppb (8) 4.8 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (2) N/A 2.3 μg/m3 (10) 10.0
 
March 15, 2019, 6 p.m. 13.3 ppb (12) 8.5 ppb (8) N/A 5.0 ppb (5) N/A N/A N/A 0.18 ppb (2) N/A 6.2 μg/m3 (26) 26.0
 
March 15, 2019, 5 p.m. 9.4 ppb (9) 5.2 ppb (5) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (2) N/A 3.9 μg/m3 (16) 16.0
 
March 15, 2019, 4 p.m. 13.0 ppb (12) 6.2 ppb (6) N/A 7.0 ppb (6) N/A N/A N/A 0.18 ppb (2) N/A 6.4 μg/m3 (27) 27.0
 
March 15, 2019, 3 p.m. 23.2 ppb (21) 12.9 ppb (12) N/A 10.0 ppb (9) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 15, 2019, 2 p.m. 18.3 ppb (17) 9.2 ppb (9) N/A 9.0 ppb (8) N/A N/A N/A 0.18 ppb (2) N/A 10.2 μg/m3 (42) 42.0
 
March 15, 2019, 1 p.m. 18.3 ppb (17) 9.8 ppb (9) N/A 9.0 ppb (8) N/A N/A N/A 0.19 ppb (2) N/A 7.1 μg/m3 (30) 30.0
 
March 15, 2019, noon 17.4 ppb (16) 8.2 ppb (8) N/A 9.0 ppb (8) N/A N/A N/A 0.18 ppb (2) N/A 2.1 μg/m3 (9) 16.0
 
March 15, 2019, 11 a.m. 6.4 ppb (6) 1.9 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.18 ppb (2) N/A 0.8 μg/m3 (3) 6.0
 
March 15, 2019, 10 a.m. 7.1 ppb (7) 2.7 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 0.7 μg/m3 (3) 7.0
 
March 15, 2019, 9 a.m. 4.4 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.14 ppb (2) N/A 0.5 μg/m3 (2) 4.0
 
March 15, 2019, 8 a.m. 4.2 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.14 ppb (2) N/A -0.6 μg/m3 (0) 4.0
 
March 15, 2019, 7 a.m. 4.0 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.14 ppb (2) N/A 0.1 μg/m3 (0) 4.0
 
March 15, 2019, 6 a.m. 4.1 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.14 ppb (2) N/A 2.7 μg/m3 (11) 11.0
 
March 15, 2019, 5 a.m. 4.0 ppb (4) 1.6 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 5.5 μg/m3 (23) 23.0
 
March 15, 2019, 4 a.m. 5.5 ppb (5) 1.9 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (2) N/A 0.2 μg/m3 (1) 5.0
 
March 15, 2019, 3 a.m. 6.1 ppb (6) 2.2 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (2) N/A 5.1 μg/m3 (21) 21.0
 
March 15, 2019, 2 a.m. 5.9 ppb (5) 2.5 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (2) N/A 4.5 μg/m3 (19) 19.0
 
March 15, 2019, 1 a.m. 6.2 ppb (6) 2.8 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (2) N/A 3.1 μg/m3 (13) 13.0
 
March 15, 2019, midnight 5.4 ppb (5) 2.5 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (2) N/A 1.9 μg/m3 (8) 8.0
 
March 14, 2019, 11 p.m. 6.3 ppb (6) 2.9 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (2) N/A 3.2 μg/m3 (13) 13.0
 
March 14, 2019, 10 p.m. 5.4 ppb (5) 2.2 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (2) N/A 2.4 μg/m3 (10) 10.0
 
March 14, 2019, 9 p.m. 6.5 ppb (6) 2.7 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (2) N/A -1.2 μg/m3 (0) 6.0
 
March 14, 2019, 8 p.m. 7.3 ppb (7) 3.6 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (2) N/A 1.0 μg/m3 (4) 7.0
 
March 14, 2019, 7 p.m. 8.4 ppb (8) 4.3 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (2) N/A -2.1 μg/m3 (0) 8.0
 
March 14, 2019, 6 p.m. 10.3 ppb (10) 5.5 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.19 ppb (2) N/A 0.0 μg/m3 (0) 10.0
 
March 14, 2019, 5 p.m. 10.1 ppb (9) 5.3 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (2) N/A 5.9 μg/m3 (25) 25.0
 
March 14, 2019, 4 p.m. 10.9 ppb (10) 5.6 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (2) N/A 8.6 μg/m3 (36) 36.0
 
March 14, 2019, 3 p.m. 9.4 ppb (9) 4.4 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (2) N/A 11.7 μg/m3 (49) 49.0
 
March 14, 2019, 2 p.m. 11.6 ppb (11) 6.1 ppb (6) N/A 5.0 ppb (5) N/A N/A N/A 0.24 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
March 14, 2019, 1 p.m. 15.7 ppb (15) 6.6 ppb (6) N/A 9.0 ppb (8) N/A N/A N/A 0.27 ppb (3) N/A 0.7 μg/m3 (3) 15.0
 
March 14, 2019, noon 17.0 ppb (16) 6.1 ppb (6) N/A 11.0 ppb (10) N/A N/A N/A 0.28 ppb (3) N/A 5.3 μg/m3 (22) 22.0
 
March 14, 2019, 11 a.m. 14.0 ppb (13) 5.7 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A 1.9 μg/m3 (8) 13.0
 
March 14, 2019, 10 a.m. 9.5 ppb (9) 3.3 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.19 ppb (2) N/A 0.3 μg/m3 (1) 9.0
 
March 14, 2019, 9 a.m. 7.6 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.16 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 14, 2019, 8 a.m. 6.4 ppb (6) 1.5 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.15 ppb (2) N/A 5.9 μg/m3 (25) 25.0
 
March 14, 2019, 7 a.m. 5.9 ppb (5) 1.3 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.15 ppb (2) N/A 1.2 μg/m3 (5) 5.0
 
March 14, 2019, 6 a.m. 6.1 ppb (6) 1.8 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.16 ppb (2) N/A 3.1 μg/m3 (13) 13.0
 
March 14, 2019, 5 a.m. 7.4 ppb (7) 1.7 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A -3.3 μg/m3 (0) 7.0
 
March 13, 2019, 5 p.m. 19.1 ppb (18) 8.3 ppb (8) N/A 11.0 ppb (10) N/A N/A N/A 0.29 ppb (3) N/A 7.1 μg/m3 (30) 30.0
 
March 13, 2019, 4 p.m. 22.7 ppb (21) 9.7 ppb (9) N/A 13.0 ppb (12) N/A N/A N/A 0.32 ppb (4) N/A 7.1 μg/m3 (30) 30.0
 
March 13, 2019, 3 p.m. 28.9 ppb (27) 12.7 ppb (12) N/A 16.0 ppb (15) N/A N/A N/A 0.33 ppb (4) N/A 6.3 μg/m3 (26) 27.0
 
March 13, 2019, 2 p.m. 51.4 ppb (48) 25.6 ppb (24) N/A 26.0 ppb (24) N/A N/A N/A 0.45 ppb (5) N/A 9.4 μg/m3 (39) 48.0
 
March 13, 2019, 1 p.m. 53.5 ppb (50) 26.3 ppb (24) N/A 27.0 ppb (25) N/A N/A N/A 0.47 ppb (5) N/A 8.1 μg/m3 (34) 50.0
 
March 13, 2019, noon 53.2 ppb (49) 22.7 ppb (21) N/A 31.0 ppb (29) N/A N/A N/A 0.49 ppb (5) N/A 8.9 μg/m3 (37) 49.0
 
March 13, 2019, 11 a.m. 50.7 ppb (47) 18.1 ppb (17) N/A 33.0 ppb (31) N/A N/A N/A 0.41 ppb (5) N/A 7.4 μg/m3 (31) 47.0
 
March 13, 2019, 10 a.m. 42.3 ppb (39) 11.7 ppb (11) N/A 31.0 ppb (29) N/A N/A N/A N/A N/A 8.1 μg/m3 (34) 39.0
 
March 13, 2019, 9 a.m. 22.8 ppb (21) 4.7 ppb (4) N/A 18.0 ppb (17) N/A N/A N/A 0.25 ppb (3) N/A -0.4 μg/m3 (0) 21.0
 
March 13, 2019, 8 a.m. 21.0 ppb (19) 2.8 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A 0.22 ppb (2) N/A 10.8 μg/m3 (45) 45.0
 
March 13, 2019, 7 a.m. 14.3 ppb (13) 2.2 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.23 ppb (3) N/A 20.9 μg/m3 (69) 69.0
 
March 13, 2019, 6 a.m. 15.4 ppb (14) 2.3 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A 0.28 ppb (3) N/A 8.2 μg/m3 (34) 34.0
 
March 13, 2019, 5 a.m. 11.7 ppb (11) 2.4 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.21 ppb (2) N/A 10.1 μg/m3 (42) 42.0
 
March 13, 2019, 4 a.m. 12.4 ppb (11) 3.2 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.22 ppb (2) N/A 2.4 μg/m3 (10) 11.0
 
March 13, 2019, 3 a.m. 12.6 ppb (12) 3.5 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 7.9 μg/m3 (33) 33.0
 
March 13, 2019, 2 a.m. 12.3 ppb (11) 3.4 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.24 ppb (3) N/A 6.1 μg/m3 (25) 25.0
 
March 13, 2019, 1 a.m. 12.0 ppb (11) 3.5 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.22 ppb (2) N/A 5.2 μg/m3 (22) 22.0
 
March 13, 2019, midnight 15.0 ppb (14) 4.3 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.24 ppb (3) N/A 4.2 μg/m3 (18) 18.0
 
March 12, 2019, 11 p.m. 20.1 ppb (19) 5.5 ppb (5) N/A 15.0 ppb (14) N/A N/A N/A 0.32 ppb (4) N/A 8.2 μg/m3 (34) 34.0
 
March 12, 2019, 10 p.m. 24.4 ppb (23) 7.3 ppb (7) N/A 17.0 ppb (16) N/A N/A N/A 0.33 ppb (4) N/A 6.4 μg/m3 (27) 27.0
 
March 12, 2019, 9 p.m. 21.2 ppb (20) 7.6 ppb (7) N/A 14.0 ppb (13) N/A N/A N/A 0.32 ppb (4) N/A 3.0 μg/m3 (12) 20.0
 
March 12, 2019, 8 p.m. 24.0 ppb (22) 10.6 ppb (10) N/A 14.0 ppb (13) N/A N/A N/A 0.32 ppb (4) N/A 5.6 μg/m3 (23) 23.0
 
March 12, 2019, 7 p.m. 21.7 ppb (20) 9.6 ppb (9) N/A 12.0 ppb (11) N/A N/A N/A 0.29 ppb (3) N/A 7.5 μg/m3 (31) 31.0
 
March 12, 2019, 6 p.m. 21.8 ppb (20) 10.3 ppb (10) N/A 12.0 ppb (11) N/A N/A N/A 0.28 ppb (3) N/A 4.1 μg/m3 (17) 20.0
 
March 12, 2019, 5 p.m. 20.9 ppb (19) 9.9 ppb (9) N/A 11.0 ppb (10) N/A N/A N/A 0.27 ppb (3) N/A 7.4 μg/m3 (31) 31.0
 
March 12, 2019, 4 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 8.0 μg/m3 (33) 33.0
 
March 12, 2019, 3 p.m. 29.3 ppb (27) 13.0 ppb (12) N/A 16.0 ppb (15) N/A N/A N/A 0.3 ppb (3) N/A 11.6 μg/m3 (48) 48.0
 
March 12, 2019, 2 p.m. 40.4 ppb (37) 18.7 ppb (17) N/A 22.0 ppb (20) N/A N/A N/A 0.36 ppb (4) N/A 11.6 μg/m3 (48) 48.0
 
March 12, 2019, 1 p.m. 39.7 ppb (37) 15.9 ppb (15) N/A 24.0 ppb (22) N/A N/A N/A 0.39 ppb (4) N/A 12.4 μg/m3 (51) 51.0
 
March 12, 2019, noon 52.2 ppb (48) 20.0 ppb (19) N/A 32.0 ppb (30) N/A N/A N/A 0.46 ppb (5) N/A 6.3 μg/m3 (26) 48.0
 
March 12, 2019, 11 a.m. 50.1 ppb (46) 18.2 ppb (17) N/A 32.0 ppb (30) N/A N/A N/A 0.46 ppb (5) N/A 10.8 μg/m3 (45) 46.0
 
March 12, 2019, 10 a.m. 43.1 ppb (40) 12.8 ppb (12) N/A 30.0 ppb (28) N/A N/A N/A 0.35 ppb (4) N/A 10.7 μg/m3 (45) 45.0
 
March 12, 2019, 9 a.m. 70.6 ppb (68) 26.6 ppb (25) N/A 44.0 ppb (41) N/A N/A N/A 0.32 ppb (4) N/A 6.4 μg/m3 (27) 68.0
 
March 12, 2019, 8 a.m. 103.8 ppb (101) 53.6 ppb (50) N/A 50.0 ppb (46) N/A N/A N/A 0.49 ppb (5) N/A 12.8 μg/m3 (52) 101.0
 
March 12, 2019, 7 a.m. 109.5 ppb (102) 60.9 ppb (57) N/A 49.0 ppb (45) N/A N/A N/A 0.63 ppb (7) N/A 15.2 μg/m3 (57) 102.0
 
March 12, 2019, 6 a.m. 80.1 ppb (78) 34.2 ppb (32) N/A 46.0 ppb (43) N/A N/A N/A 0.62 ppb (7) N/A 11.0 μg/m3 (46) 78.0
 
March 12, 2019, 5 a.m. 90.6 ppb (89) 43.0 ppb (40) N/A 48.0 ppb (44) N/A N/A N/A 0.75 ppb (8) N/A 22.4 μg/m3 (72) 89.0
 
March 12, 2019, 4 a.m. 61.7 ppb (58) 17.3 ppb (16) N/A 44.0 ppb (41) N/A N/A N/A 0.6 ppb (7) N/A 13.1 μg/m3 (52) 58.0
 
March 12, 2019, 3 a.m. 32.2 ppb (30) 0.9 ppb (1) N/A 31.0 ppb (29) N/A N/A N/A 0.38 ppb (4) N/A 4.4 μg/m3 (18) 30.0
 
March 12, 2019, 2 a.m. 40.9 ppb (38) 7.5 ppb (7) N/A 33.0 ppb (31) N/A N/A N/A 0.43 ppb (5) N/A 5.5 μg/m3 (23) 38.0
 
March 12, 2019, 1 a.m. 41.4 ppb (38) 10.7 ppb (10) N/A 31.0 ppb (29) N/A N/A N/A 0.42 ppb (5) N/A 3.4 μg/m3 (14) 38.0
 
March 12, 2019, midnight 11.3 ppb (10) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A 0.24 ppb (3) N/A 6.7 μg/m3 (28) 28.0
 
March 11, 2019, 11 p.m. 13.4 ppb (12) 2.3 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.2 ppb (2) N/A 5.9 μg/m3 (25) 25.0
 
March 11, 2019, 10 p.m. 15.8 ppb (15) 4.4 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.28 ppb (3) N/A 9.2 μg/m3 (38) 38.0
 
March 11, 2019, 9 p.m. 10.8 ppb (10) 3.1 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A -0.5 μg/m3 (0) 10.0
 
March 11, 2019, 8 p.m. 12.5 ppb (12) 4.5 ppb (4) N/A 8.0 ppb (7) N/A N/A N/A 0.18 ppb (2) N/A -0.9 μg/m3 (0) 12.0
 
March 11, 2019, 7 p.m. 14.0 ppb (13) 5.7 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A 0.17 ppb (2) N/A 4.7 μg/m3 (20) 20.0
 
March 11, 2019, 6 p.m. 14.0 ppb (13) 5.5 ppb (5) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 4.7 μg/m3 (20) 20.0
 
March 11, 2019, 5 p.m. 15.0 ppb (14) 4.4 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.36 ppb (4) N/A 7.1 μg/m3 (30) 30.0
 
March 11, 2019, 4 p.m. 18.0 ppb (17) 5.5 ppb (5) N/A 13.0 ppb (12) N/A N/A N/A 0.34 ppb (4) N/A 8.6 μg/m3 (36) 36.0
 
March 11, 2019, 3 p.m. 18.7 ppb (17) 4.9 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A 0.23 ppb (3) N/A 9.5 μg/m3 (40) 40.0
 
March 11, 2019, 2 p.m. 14.4 ppb (13) 2.4 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.19 ppb (2) N/A 10.8 μg/m3 (45) 45.0
 
March 11, 2019, 1 p.m. 32.6 ppb (30) 12.3 ppb (11) N/A 20.0 ppb (19) N/A N/A N/A 0.2 ppb (2) N/A 11.7 μg/m3 (49) 49.0
 
March 11, 2019, noon 45.6 ppb (42) 21.2 ppb (20) N/A 25.0 ppb (23) N/A N/A N/A 0.26 ppb (3) N/A 8.8 μg/m3 (37) 42.0
 
March 11, 2019, 11 a.m. 17.0 ppb (16) 5.2 ppb (5) N/A 12.0 ppb (11) N/A N/A N/A 0.17 ppb (2) N/A 10.3 μg/m3 (43) 43.0
 
March 11, 2019, 10 a.m. 13.4 ppb (12) 3.3 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
March 11, 2019, 9 a.m. 8.3 ppb (8) 0.9 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.18 ppb (2) N/A 3.6 μg/m3 (15) 15.0
 
March 11, 2019, 8 a.m. 7.1 ppb (7) 0.9 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 6.4 μg/m3 (27) 27.0
 
March 11, 2019, 7 a.m. 8.7 ppb (8) 0.9 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.21 ppb (2) N/A 5.4 μg/m3 (23) 23.0
 
March 11, 2019, 6 a.m. 17.4 ppb (16) 1.0 ppb (1) N/A 16.0 ppb (15) N/A N/A N/A 0.28 ppb (3) N/A 6.2 μg/m3 (26) 26.0
 
March 11, 2019, 5 a.m. 20.1 ppb (19) 1.0 ppb (1) N/A 19.0 ppb (18) N/A N/A N/A 0.3 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
March 11, 2019, 4 a.m. 15.9 ppb (15) 1.0 ppb (1) N/A 15.0 ppb (14) N/A N/A N/A 0.31 ppb (3) N/A 13.3 μg/m3 (53) 53.0
 
March 11, 2019, 3 a.m. 13.4 ppb (12) 0.8 ppb (1) N/A 13.0 ppb (12) N/A N/A N/A 0.26 ppb (3) N/A 4.2 μg/m3 (18) 18.0
 
March 11, 2019, 2 a.m. 12.8 ppb (12) 0.8 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A 0.3 ppb (3) N/A 8.1 μg/m3 (34) 34.0