AQSQID: 295100094

Site Name: Forest Park

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

Reporting: True, Located: True

Current AQI: 6.0

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
May 26, 2019, noon 7.0 ppb (6) 1.3 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A -2.8 μg/m3 (0) 6.0
 
May 26, 2019, 11 a.m. 7.6 ppb (7) 0.6 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.17 ppb (2) N/A 7.2 μg/m3 (30) 30.0
 
May 26, 2019, 10 a.m. 4.8 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 12.2 μg/m3 (50) 50.0
 
May 26, 2019, 9 a.m. 4.1 ppb (4) 0.5 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (2) N/A 5.2 μg/m3 (22) 22.0
 
May 26, 2019, 8 a.m. 3.6 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (2) N/A 12.6 μg/m3 (51) 51.0
 
May 26, 2019, 7 a.m. 7.9 ppb (7) 1.5 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 13.4 μg/m3 (53) 53.0
 
May 26, 2019, 6 a.m. 3.1 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.21 ppb (2) N/A 10.5 μg/m3 (44) 44.0
 
May 26, 2019, 5 a.m. 4.0 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.24 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
May 26, 2019, 4 a.m. 5.6 ppb (5) 1.4 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.26 ppb (3) N/A 9.8 μg/m3 (41) 41.0
 
May 26, 2019, 3 a.m. 5.8 ppb (5) 1.7 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.26 ppb (3) N/A 12.6 μg/m3 (51) 51.0
 
May 26, 2019, 2 a.m. 13.0 ppb (12) 3.4 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.38 ppb (4) N/A 23.0 μg/m3 (73) 73.0
 
May 26, 2019, 1 a.m. 9.3 ppb (9) 2.6 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.32 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
May 26, 2019, midnight 5.4 ppb (5) 1.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.26 ppb (3) N/A 14.2 μg/m3 (55) 55.0
 
May 25, 2019, 11 p.m. 5.1 ppb (5) 1.8 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.25 ppb (3) N/A 6.1 μg/m3 (25) 25.0
 
May 25, 2019, 10 p.m. 3.9 ppb (4) 1.5 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.23 ppb (3) N/A 7.1 μg/m3 (30) 30.0
 
May 25, 2019, 9 p.m. 5.9 ppb (5) 2.3 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.25 ppb (3) N/A 4.9 μg/m3 (20) 20.0
 
May 25, 2019, 8 p.m. 4.1 ppb (4) 1.8 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.23 ppb (3) N/A 11.1 μg/m3 (46) 46.0
 
May 25, 2019, 7 p.m. 5.8 ppb (5) 2.7 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.26 ppb (3) N/A 1.8 μg/m3 (8) 8.0
 
May 25, 2019, 6 p.m. 5.3 ppb (5) 2.6 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.23 ppb (3) N/A 5.7 μg/m3 (24) 24.0
 
May 25, 2019, 5 p.m. 7.4 ppb (7) 2.9 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.26 ppb (3) N/A -0.6 μg/m3 (0) 7.0
 
May 25, 2019, 4 p.m. 9.2 ppb (9) 3.2 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.3 ppb (3) N/A 2.9 μg/m3 (12) 12.0
 
May 25, 2019, 3 p.m. 8.1 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.28 ppb (3) N/A -2.2 μg/m3 (0) 8.0
 
May 25, 2019, 2 p.m. 7.3 ppb (7) 2.7 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.25 ppb (3) N/A 3.9 μg/m3 (16) 16.0
 
May 25, 2019, 1 p.m. 8.6 ppb (8) 3.3 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.26 ppb (3) N/A -1.1 μg/m3 (0) 8.0
 
May 25, 2019, noon 6.6 ppb (6) 2.2 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.22 ppb (2) N/A 5.1 μg/m3 (21) 21.0
 
May 25, 2019, 11 a.m. 5.1 ppb (5) 1.2 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (2) N/A -1.7 μg/m3 (0) 5.0
 
May 25, 2019, 10 a.m. 4.4 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (2) N/A 5.4 μg/m3 (23) 23.0
 
May 25, 2019, 9 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.19 ppb (2) N/A 11.3 μg/m3 (47) 47.0
 
May 25, 2019, 8 a.m. 7.3 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A 14.0 μg/m3 (54) 54.0
 
May 25, 2019, 7 a.m. 3.0 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (2) N/A 6.5 μg/m3 (27) 27.0
 
May 25, 2019, 6 a.m. 2.8 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (2) N/A 6.7 μg/m3 (28) 28.0
 
May 25, 2019, 5 a.m. 3.6 ppb (3) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (2) N/A 6.2 μg/m3 (26) 26.0
 
May 25, 2019, 4 a.m. 5.9 ppb (5) 1.3 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.23 ppb (3) N/A 14.9 μg/m3 (56) 56.0
 
May 25, 2019, 3 a.m. 9.9 ppb (9) 2.1 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.3 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 25, 2019, 2 a.m. 16.5 ppb (15) 4.2 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A 0.39 ppb (4) N/A 8.8 μg/m3 (37) 37.0
 
May 25, 2019, 1 a.m. 14.9 ppb (14) 3.3 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.34 ppb (4) N/A 8.3 μg/m3 (35) 35.0
 
May 25, 2019, midnight 10.4 ppb (10) 3.1 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A 0.33 ppb (4) N/A 13.5 μg/m3 (53) 53.0
 
May 24, 2019, 11 p.m. 9.2 ppb (9) 3.7 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.29 ppb (3) N/A 5.7 μg/m3 (24) 24.0
 
May 24, 2019, 10 p.m. 7.1 ppb (7) 3.1 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.28 ppb (3) N/A 10.5 μg/m3 (44) 44.0
 
May 24, 2019, 9 p.m. 8.0 ppb (7) 4.0 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.28 ppb (3) N/A 6.8 μg/m3 (28) 28.0
 
May 24, 2019, 8 p.m. 7.5 ppb (7) 3.9 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.24 ppb (3) N/A 7.3 μg/m3 (30) 30.0
 
May 24, 2019, 7 p.m. 9.5 ppb (9) 4.8 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.25 ppb (3) N/A 16.2 μg/m3 (59) 59.0
 
May 24, 2019, 6 p.m. 8.4 ppb (8) 4.4 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.24 ppb (3) N/A 4.3 μg/m3 (18) 18.0
 
May 24, 2019, 5 p.m. 7.9 ppb (7) 4.1 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.24 ppb (3) N/A 10.7 μg/m3 (45) 45.0
 
May 24, 2019, 4 p.m. 8.6 ppb (8) 4.4 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.25 ppb (3) N/A 11.9 μg/m3 (50) 50.0
 
May 24, 2019, 3 p.m. 11.0 ppb (10) 5.6 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.26 ppb (3) N/A 11.3 μg/m3 (47) 47.0
 
May 24, 2019, 2 p.m. 12.2 ppb (11) 6.2 ppb (6) N/A 6.0 ppb (6) N/A N/A N/A 0.26 ppb (3) N/A 9.1 μg/m3 (38) 38.0
 
May 24, 2019, 1 p.m. 16.3 ppb (15) 7.7 ppb (7) N/A 9.0 ppb (8) N/A N/A N/A 0.31 ppb (3) N/A 14.4 μg/m3 (55) 55.0
 
May 24, 2019, noon 22.9 ppb (21) 11.0 ppb (10) N/A 12.0 ppb (11) N/A N/A N/A 0.39 ppb (4) N/A 14.4 μg/m3 (55) 55.0
 
May 24, 2019, 11 a.m. 23.8 ppb (22) 11.3 ppb (10) N/A 13.0 ppb (12) N/A N/A N/A 0.43 ppb (5) N/A 13.1 μg/m3 (52) 52.0
 
May 24, 2019, 10 a.m. 14.7 ppb (14) 4.0 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 4.9 μg/m3 (20) 20.0
 
May 24, 2019, 9 a.m. 14.9 ppb (14) 2.8 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.34 ppb (4) N/A 8.2 μg/m3 (34) 34.0
 
May 24, 2019, 8 a.m. 13.4 ppb (12) 1.8 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.29 ppb (3) N/A 21.1 μg/m3 (69) 69.0
 
May 24, 2019, 7 a.m. 14.5 ppb (13) 1.4 ppb (1) N/A 13.0 ppb (12) N/A N/A N/A 0.29 ppb (3) N/A 11.5 μg/m3 (48) 48.0
 
May 24, 2019, 6 a.m. 15.3 ppb (14) 1.9 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A 0.26 ppb (3) N/A 12.1 μg/m3 (50) 50.0
 
May 24, 2019, 5 a.m. 15.9 ppb (15) 1.3 ppb (1) N/A 15.0 ppb (14) N/A N/A N/A 0.33 ppb (4) N/A 13.7 μg/m3 (54) 54.0
 
May 24, 2019, 4 a.m. 29.1 ppb (27) 3.5 ppb (3) N/A 26.0 ppb (24) N/A N/A N/A 0.4 ppb (4) N/A 23.3 μg/m3 (74) 74.0
 
May 24, 2019, 3 a.m. 22.3 ppb (21) 2.1 ppb (2) N/A 20.0 ppb (19) N/A N/A N/A 0.4 ppb (4) N/A 5.6 μg/m3 (23) 23.0
 
May 24, 2019, 2 a.m. 9.9 ppb (9) 0.3 ppb (0) N/A 10.0 ppb (9) N/A N/A N/A 0.28 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 24, 2019, 1 a.m. 7.0 ppb (6) 0.3 ppb (0) N/A 7.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 5.2 μg/m3 (22) 22.0
 
May 24, 2019, midnight 4.2 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.22 ppb (2) N/A 5.7 μg/m3 (24) 24.0
 
May 23, 2019, 11 p.m. 2.2 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.19 ppb (2) N/A 3.9 μg/m3 (16) 16.0
 
May 23, 2019, 10 p.m. 2.1 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.17 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 23, 2019, 9 p.m. 2.4 ppb (2) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.17 ppb (2) N/A N/A 2.0
 
May 23, 2019, 8 p.m. 6.3 ppb (6) 2.5 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (2) N/A N/A 6.0
 
May 23, 2019, 7 p.m. 12.0 ppb (11) 4.1 ppb (4) N/A 8.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A 3.1 μg/m3 (13) 13.0
 
May 23, 2019, 6 p.m. 13.3 ppb (12) 4.1 ppb (4) N/A 9.0 ppb (8) N/A N/A N/A 0.26 ppb (3) N/A 4.7 μg/m3 (20) 20.0
 
May 23, 2019, 5 p.m. 12.1 ppb (11) 2.8 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.28 ppb (3) N/A 2.1 μg/m3 (9) 11.0
 
May 23, 2019, 4 p.m. 17.3 ppb (16) 4.4 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.33 ppb (4) N/A 7.8 μg/m3 (32) 32.0
 
May 23, 2019, 3 p.m. 25.0 ppb (23) 11.0 ppb (10) N/A 14.0 ppb (13) N/A N/A N/A 0.37 ppb (4) N/A 8.3 μg/m3 (35) 35.0
 
May 23, 2019, 2 p.m. 21.3 ppb (20) 7.1 ppb (7) N/A 14.0 ppb (13) N/A N/A N/A 0.35 ppb (4) N/A 7.5 μg/m3 (31) 31.0
 
May 23, 2019, 1 p.m. 30.5 ppb (28) 12.4 ppb (11) N/A 18.0 ppb (17) N/A N/A N/A 0.38 ppb (4) N/A 6.9 μg/m3 (29) 29.0
 
May 23, 2019, noon 29.5 ppb (27) 10.0 ppb (9) N/A 20.0 ppb (19) N/A N/A N/A 0.4 ppb (4) N/A 4.8 μg/m3 (20) 27.0
 
May 23, 2019, 11 a.m. 29.4 ppb (27) 9.4 ppb (9) N/A 20.0 ppb (19) N/A N/A N/A 0.43 ppb (5) N/A 3.8 μg/m3 (16) 27.0
 
May 23, 2019, 10 a.m. 9.9 ppb (9) 2.3 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 5.8 μg/m3 (24) 24.0
 
May 23, 2019, 9 a.m. 4.9 ppb (5) 1.7 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.15 ppb (2) N/A N/A 5.0
 
May 23, 2019, 8 a.m. 2.3 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (2) N/A 8.5 μg/m3 (35) 35.0
 
May 23, 2019, 7 a.m. 5.7 ppb (5) 1.2 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.17 ppb (2) N/A 11.2 μg/m3 (47) 47.0
 
May 23, 2019, 6 a.m. 5.6 ppb (5) 1.2 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (2) N/A 11.1 μg/m3 (46) 46.0
 
May 23, 2019, 5 a.m. 7.4 ppb (7) 1.6 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.26 ppb (3) N/A 11.5 μg/m3 (48) 48.0
 
May 23, 2019, 4 a.m. 8.6 ppb (8) 1.9 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.26 ppb (3) N/A 6.8 μg/m3 (28) 28.0
 
May 23, 2019, 3 a.m. 9.4 ppb (9) 2.8 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A 0.26 ppb (3) N/A 8.1 μg/m3 (34) 34.0
 
May 23, 2019, 2 a.m. 8.6 ppb (8) 3.1 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.28 ppb (3) N/A 6.9 μg/m3 (29) 29.0
 
May 23, 2019, 1 a.m. 11.1 ppb (10) 3.7 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A 0.3 ppb (3) N/A 9.1 μg/m3 (38) 38.0
 
May 23, 2019, midnight 9.5 ppb (9) 3.5 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.27 ppb (3) N/A 7.3 μg/m3 (30) 30.0
 
May 22, 2019, 11 p.m. 8.9 ppb (8) 3.5 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.29 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
May 22, 2019, 10 p.m. 7.6 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.24 ppb (3) N/A 0.7 μg/m3 (3) 7.0
 
May 22, 2019, 9 p.m. 9.5 ppb (9) 4.0 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.26 ppb (3) N/A 7.1 μg/m3 (30) 30.0
 
May 22, 2019, 8 p.m. 11.1 ppb (10) 4.6 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A 0.26 ppb (3) N/A N/A 10.0
 
May 22, 2019, 7 p.m. 13.2 ppb (12) 5.6 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 10.4 μg/m3 (43) 43.0
 
May 22, 2019, 6 p.m. 14.6 ppb (14) 6.4 ppb (6) N/A 8.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A 1.7 μg/m3 (7) 14.0
 
May 22, 2019, 5 p.m. 13.2 ppb (12) 5.6 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A 0.27 ppb (3) N/A 2.0 μg/m3 (8) 12.0
 
May 22, 2019, 4 p.m. 13.7 ppb (13) 5.9 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A 0.27 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
May 22, 2019, 3 p.m. 14.6 ppb (14) 6.8 ppb (6) N/A 8.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A 11.1 μg/m3 (46) 46.0
 
May 22, 2019, 2 p.m. 17.5 ppb (16) 8.0 ppb (7) N/A 10.0 ppb (9) N/A N/A N/A 0.29 ppb (3) N/A 12.2 μg/m3 (50) 50.0
 
May 22, 2019, 1 p.m. 18.0 ppb (17) 7.5 ppb (7) N/A 11.0 ppb (10) N/A N/A N/A 0.29 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
May 22, 2019, noon 19.6 ppb (18) 7.6 ppb (7) N/A 12.0 ppb (11) N/A N/A N/A 0.32 ppb (4) N/A 10.8 μg/m3 (45) 45.0
 
May 22, 2019, 11 a.m. 21.3 ppb (20) 7.4 ppb (7) N/A 14.0 ppb (13) N/A N/A N/A 0.4 ppb (4) N/A 9.3 μg/m3 (39) 39.0
 
May 22, 2019, 10 a.m. 16.2 ppb (15) 4.3 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A N/A N/A -1.4 μg/m3 (0) 15.0
 
May 22, 2019, 9 a.m. 9.2 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.19 ppb (2) N/A 4.8 μg/m3 (20) 20.0
 
May 22, 2019, 8 a.m. 9.3 ppb (9) 1.3 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.16 ppb (2) N/A 7.3 μg/m3 (30) 30.0
 
May 22, 2019, 7 a.m. 5.8 ppb (5) 0.8 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.16 ppb (2) N/A 0.8 μg/m3 (3) 5.0
 
May 22, 2019, 6 a.m. 4.7 ppb (4) 0.8 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.16 ppb (2) N/A 4.1 μg/m3 (17) 17.0
 
May 22, 2019, 5 a.m. 7.8 ppb (7) 1.4 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
 
May 22, 2019, 4 a.m. 8.8 ppb (8) 1.3 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.2 ppb (2) N/A -3.7 μg/m3 (0) 8.0
 
May 22, 2019, 3 a.m. 12.2 ppb (11) 2.1 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.22 ppb (2) N/A -2.3 μg/m3 (0) 11.0
 
May 22, 2019, 2 a.m. 8.3 ppb (8) 1.1 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A N/A 8.0
 
May 22, 2019, 1 a.m. 8.9 ppb (8) 1.7 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A -2.6 μg/m3 (0) 8.0
 
May 22, 2019, midnight 5.3 ppb (5) 1.3 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (2) N/A 13.7 μg/m3 (54) 54.0
 
May 21, 2019, 11 p.m. 8.7 ppb (8) 1.5 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.28 ppb (3) N/A 6.9 μg/m3 (29) 29.0
 
May 21, 2019, 10 p.m. 8.6 ppb (8) 2.2 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 12.9 μg/m3 (52) 52.0
 
May 21, 2019, 9 p.m. 10.8 ppb (10) 2.9 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.27 ppb (3) N/A 2.4 μg/m3 (10) 10.0
 
May 21, 2019, 8 p.m. 14.5 ppb (13) 4.9 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A 0.29 ppb (3) N/A 10.1 μg/m3 (42) 42.0
 
May 21, 2019, 7 p.m. 20.4 ppb (19) 9.0 ppb (8) N/A 12.0 ppb (11) N/A N/A N/A 0.34 ppb (4) N/A 10.9 μg/m3 (45) 45.0
 
May 21, 2019, 6 p.m. 20.8 ppb (19) 10.7 ppb (10) N/A 10.0 ppb (9) N/A N/A N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
May 21, 2019, 5 p.m. 19.7 ppb (18) 11.5 ppb (11) N/A 8.0 ppb (7) N/A N/A N/A 0.29 ppb (3) N/A 1.8 μg/m3 (8) 18.0
 
May 21, 2019, 4 p.m. 21.8 ppb (20) 13.7 ppb (13) N/A 8.0 ppb (7) N/A N/A N/A 0.33 ppb (4) N/A 19.4 μg/m3 (66) 66.0
 
May 21, 2019, 3 p.m. 20.0 ppb (19) 11.9 ppb (11) N/A 8.0 ppb (7) N/A N/A N/A 0.28 ppb (3) N/A 11.3 μg/m3 (47) 47.0
 
May 21, 2019, 2 p.m. 18.5 ppb (17) 10.5 ppb (10) N/A 8.0 ppb (7) N/A N/A N/A 0.26 ppb (3) N/A 8.8 μg/m3 (37) 37.0
 
May 21, 2019, 1 p.m. 16.6 ppb (15) 9.5 ppb (9) N/A 7.0 ppb (6) N/A N/A N/A 0.26 ppb (3) N/A 8.9 μg/m3 (37) 37.0
 
May 21, 2019, noon 14.7 ppb (14) 7.8 ppb (7) N/A 7.0 ppb (6) N/A N/A N/A 0.24 ppb (3) N/A 7.7 μg/m3 (32) 32.0
 
May 21, 2019, 11 a.m. 8.2 ppb (8) 2.7 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 5.1 μg/m3 (21) 21.0
 
May 21, 2019, 10 a.m. 3.0 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.13 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
May 21, 2019, 9 a.m. 4.6 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.16 ppb (2) N/A 1.3 μg/m3 (5) 5.0
 
May 21, 2019, 8 a.m. 2.2 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.13 ppb (1) N/A 3.7 μg/m3 (15) 15.0
 
May 21, 2019, 7 a.m. 2.3 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.13 ppb (1) N/A -2.6 μg/m3 (0) 2.0
 
May 21, 2019, 6 a.m. 2.4 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.12 ppb (1) N/A 20.0 μg/m3 (67) 67.0
 
May 21, 2019, 5 a.m. 2.8 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.12 ppb (1) N/A 6.1 μg/m3 (25) 25.0
 
May 21, 2019, 4 a.m. 3.5 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.14 ppb (2) N/A 6.1 μg/m3 (25) 25.0
 
May 21, 2019, 3 a.m. 5.6 ppb (5) 0.2 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.19 ppb (2) N/A -0.9 μg/m3 (0) 6.0
 
May 21, 2019, 2 a.m. 4.4 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.15 ppb (2) N/A 17.0 μg/m3 (61) 61.0
 
May 21, 2019, 1 a.m. 3.1 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.14 ppb (2) N/A 24.7 μg/m3 (77) 77.0
 
May 21, 2019, midnight 2.4 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 6.3 μg/m3 (26) 26.0
 
May 20, 2019, 11 p.m. 2.2 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 4.6 μg/m3 (19) 19.0
 
May 20, 2019, 10 p.m. 1.9 ppb (2) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A 3.8 μg/m3 (16) 16.0
 
May 20, 2019, 9 p.m. 1.8 ppb (2) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.13 ppb (1) N/A N/A 2.0
 
May 20, 2019, 8 p.m. 3.2 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 0.7 μg/m3 (3) 3.0
 
May 20, 2019, 7 p.m. 12.2 ppb (11) 7.1 ppb (7) N/A 5.0 ppb (5) N/A N/A N/A 0.14 ppb (2) N/A 3.5 μg/m3 (15) 15.0
 
May 20, 2019, 6 p.m. 8.4 ppb (8) 4.2 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.16 ppb (2) N/A 5.9 μg/m3 (25) 25.0
 
May 20, 2019, 5 p.m. 3.2 ppb (3) 1.4 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 20, 2019, 4 p.m. 5.0 ppb (5) 2.4 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.14 ppb (2) N/A 2.5 μg/m3 (10) 10.0
 
May 20, 2019, 3 p.m. 6.1 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.15 ppb (2) N/A -0.1 μg/m3 (0) 6.0
 
May 20, 2019, 2 p.m. 11.6 ppb (11) 6.7 ppb (6) N/A 5.0 ppb (5) N/A N/A N/A 0.17 ppb (2) N/A -1.5 μg/m3 (0) 11.0
 
May 20, 2019, 1 p.m. 8.9 ppb (8) 4.3 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.16 ppb (2) N/A 4.8 μg/m3 (20) 20.0
 
May 20, 2019, noon 23.3 ppb (22) 12.7 ppb (12) N/A 11.0 ppb (10) N/A N/A N/A 0.26 ppb (3) N/A N/A 22.0
 
May 20, 2019, 11 a.m. 6.7 ppb (6) 1.7 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.17 ppb (2) N/A 1.3 μg/m3 (5) 6.0
 
May 20, 2019, 10 a.m. 2.2 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 5.9 μg/m3 (25) 25.0
 
May 20, 2019, 9 a.m. 2.2 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 2.3 μg/m3 (10) 10.0
 
May 20, 2019, 8 a.m. 2.9 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.14 ppb (2) N/A 0.5 μg/m3 (2) 3.0
 
May 20, 2019, 7 a.m. 2.3 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.13 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
May 20, 2019, 6 a.m. 6.4 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.15 ppb (2) N/A 9.2 μg/m3 (38) 38.0
 
May 20, 2019, 5 a.m. 1.9 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.13 ppb (1) N/A 8.9 μg/m3 (37) 37.0
 
May 20, 2019, 4 a.m. 0.9 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.13 ppb (1) N/A 9.9 μg/m3 (41) 41.0
 
May 20, 2019, 3 a.m. 1.6 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A 6.2 μg/m3 (26) 26.0
 
May 20, 2019, 2 a.m. 1.4 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A -1.1 μg/m3 (0) 2.0
 
May 20, 2019, 1 a.m. 1.7 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A 0.9 μg/m3 (4) 4.0
 
May 20, 2019, midnight 7.6 ppb (7) 1.9 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.26 ppb (3) N/A -3.0 μg/m3 (0) 7.0
 
May 19, 2019, 11 p.m. 8.1 ppb (8) 2.1 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.26 ppb (3) N/A 12.7 μg/m3 (51) 51.0
 
May 19, 2019, 10 p.m. 7.8 ppb (7) 2.6 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.25 ppb (3) N/A 12.4 μg/m3 (51) 51.0
 
May 19, 2019, 9 p.m. 6.4 ppb (6) 2.1 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.23 ppb (3) N/A 3.9 μg/m3 (16) 16.0
 
May 19, 2019, 8 p.m. 6.2 ppb (6) 2.3 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.23 ppb (3) N/A 11.9 μg/m3 (50) 50.0
 
May 19, 2019, 7 p.m. 4.8 ppb (4) 1.9 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.21 ppb (2) N/A 2.4 μg/m3 (10) 10.0
 
May 19, 2019, 6 p.m. 6.9 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.23 ppb (3) N/A -0.5 μg/m3 (0) 6.0
 
May 19, 2019, 5 p.m. 4.7 ppb (4) 2.5 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 19, 2019, 4 p.m. 3.7 ppb (3) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.2 ppb (2) N/A 4.3 μg/m3 (18) 18.0
 
May 19, 2019, 3 p.m. 2.7 ppb (3) 1.5 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 6.3 μg/m3 (26) 26.0
 
May 19, 2019, 2 p.m. 4.3 ppb (4) 1.9 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.19 ppb (2) N/A 0.1 μg/m3 (0) 4.0
 
May 19, 2019, 1 p.m. 5.1 ppb (5) 1.8 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (2) N/A 3.9 μg/m3 (16) 16.0