ID: 2215

AQSQID: 295100094

Site Name: Forest Park

Added: April 21, 2020, 6:24 p.m.

Updated: Aug. 3, 2021, 11:56 p.m.

Location: Saint Louis (Forest Park), MO

Reporting: True, Located: True

Current AQI: 3.0

Saint Louis (Forest Park) MO, US: 38.631057, -90.281144

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Aug. 3, 2021, 10 p.m. 0.7 ppb (1) -0.7 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.2 ppb (3) N/A -2.7 μg/m3 (0) 3.0
 
Aug. 3, 2021, 9 p.m. 0.6 ppb (1) -0.7 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.2 ppb (3) N/A -1.5 μg/m3 (0) 3.0
 
Aug. 3, 2021, 8 p.m. 1.2 ppb (2) -0.6 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.2 ppb (3) N/A N/A 3.0
 
Aug. 3, 2021, 7 p.m. 1.0 ppb (1) -0.6 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.2 ppb (3) N/A -4.1 μg/m3 (0) 3.0
 
Aug. 3, 2021, 6 p.m. 1.9 ppb (2) -0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.21 ppb (3) N/A 0.8 μg/m3 (4) 4.0
 
Aug. 3, 2021, 5 p.m. 1.5 ppb (2) -0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.2 ppb (3) N/A 0.7 μg/m3 (3) 3.0
 
Aug. 3, 2021, 4 p.m. 3.0 ppb (3) 0.2 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.21 ppb (3) N/A N/A 3.0
 
Aug. 3, 2021, 3 p.m. 3.5 ppb (4) 0.5 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.21 ppb (3) N/A 5.3 μg/m3 (23) 23.0
 
Aug. 3, 2021, 2 p.m. 8.2 ppb (8) 3.8 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.22 ppb (3) N/A 9.2 μg/m3 (39) 39.0
 
Aug. 3, 2021, 1 p.m. 61.0 ppb (59) 45.0 ppb (43) N/A 18.0 ppb (17) N/A N/A N/A 0.32 ppb (4) N/A -3.4 μg/m3 (0) 59.0
 
Aug. 3, 2021, noon 32.8 ppb (31) 14.3 ppb (14) N/A 19.0 ppb (18) N/A N/A N/A 0.63 ppb (7) N/A 1.2 μg/m3 (5) 31.0
 
Aug. 3, 2021, 11 a.m. 17.8 ppb (17) 4.7 ppb (5) N/A 13.0 ppb (13) N/A N/A N/A 0.96 ppb (12) N/A N/A 17.0
 
Aug. 3, 2021, 10 a.m. 6.1 ppb (6) -0.7 ppb (0) N/A 7.0 ppb (7) N/A N/A N/A 0.3 ppb (4) N/A -0.1 μg/m3 (0) 7.0
 
Aug. 3, 2021, 9 a.m. 6.4 ppb (7) -0.7 ppb (0) N/A 7.0 ppb (7) N/A N/A N/A 0.31 ppb (4) N/A 0.8 μg/m3 (4) 7.0
 
Aug. 3, 2021, 8 a.m. 7.7 ppb (8) -0.7 ppb (0) N/A 8.0 ppb (8) N/A N/A N/A 0.35 ppb (4) N/A -1.6 μg/m3 (0) 8.0
 
Aug. 3, 2021, 7 a.m. 10.0 ppb (10) -0.7 ppb (0) N/A 11.0 ppb (11) N/A N/A N/A 0.39 ppb (5) N/A -0.4 μg/m3 (0) 11.0
 
Aug. 3, 2021, 6 a.m. 12.4 ppb (12) -0.7 ppb (0) N/A 13.0 ppb (13) N/A N/A N/A 0.41 ppb (5) N/A -1.1 μg/m3 (0) 13.0
 
Aug. 3, 2021, 5 a.m. 12.1 ppb (12) -0.8 ppb (0) N/A 13.0 ppb (13) N/A N/A N/A 0.37 ppb (5) N/A 1.4 μg/m3 (6) 13.0
 
Aug. 3, 2021, 4 a.m. 10.3 ppb (10) -0.8 ppb (0) N/A 11.0 ppb (11) N/A N/A N/A 0.37 ppb (5) N/A 0.0 μg/m3 (0) 11.0
 
Aug. 3, 2021, 3 a.m. 9.8 ppb (10) -0.8 ppb (0) N/A 11.0 ppb (11) N/A N/A N/A 0.34 ppb (4) N/A -0.2 μg/m3 (0) 11.0
 
Aug. 3, 2021, 2 a.m. 6.5 ppb (7) -0.8 ppb (0) N/A 7.0 ppb (7) N/A N/A N/A 0.29 ppb (4) N/A 3.8 μg/m3 (16) 16.0
 
Aug. 3, 2021, 1 a.m. 2.2 ppb (3) -0.9 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.27 ppb (4) N/A 5.6 μg/m3 (24) 24.0
 
Aug. 3, 2021, midnight 0.8 ppb (1) -0.8 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.26 ppb (4) N/A 2.7 μg/m3 (12) 12.0
 
Aug. 2, 2021, 11 p.m. 0.4 ppb (1) -0.8 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.27 ppb (4) N/A 0.4 μg/m3 (2) 4.0
 
Aug. 2, 2021, 10 p.m. 0.7 ppb (1) -0.7 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.29 ppb (4) N/A 3.1 μg/m3 (13) 13.0
 
Aug. 2, 2021, 9 p.m. 0.5 ppb (1) -0.7 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.3 ppb (4) N/A -2.0 μg/m3 (0) 4.0
 
Aug. 2, 2021, 8 p.m. 1.5 ppb (2) -0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.3 ppb (4) N/A -0.2 μg/m3 (0) 4.0
 
Aug. 2, 2021, 7 p.m. 1.7 ppb (2) -0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.3 ppb (4) N/A -0.7 μg/m3 (0) 4.0
 
Aug. 2, 2021, 6 p.m. 4.2 ppb (4) 0.5 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.34 ppb (4) N/A 2.0 μg/m3 (9) 9.0
 
Aug. 2, 2021, 5 p.m. 4.9 ppb (5) 0.5 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.32 ppb (4) N/A 6.3 μg/m3 (27) 27.0
 
Aug. 2, 2021, 4 p.m. 7.7 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.34 ppb (4) N/A -2.7 μg/m3 (0) 8.0
 
Aug. 2, 2021, 3 p.m. 11.9 ppb (12) 4.4 ppb (5) N/A 8.0 ppb (8) N/A N/A N/A 0.36 ppb (5) N/A 8.6 μg/m3 (36) 36.0
 
Aug. 2, 2021, 2 p.m. 13.6 ppb (13) 4.8 ppb (5) N/A 9.0 ppb (9) N/A N/A N/A 0.38 ppb (5) N/A N/A 13.0
 
Aug. 2, 2021, 1 p.m. 7.9 ppb (8) 1.1 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.34 ppb (4) N/A -1.5 μg/m3 (0) 8.0
 
Aug. 2, 2021, noon 6.1 ppb (6) 0.1 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.35 ppb (4) N/A 2.1 μg/m3 (9) 9.0
 
Aug. 2, 2021, 11 a.m. 5.1 ppb (5) -0.6 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.37 ppb (5) N/A -1.2 μg/m3 (0) 6.0
 
Aug. 2, 2021, 10 a.m. 6.0 ppb (6) -0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.36 ppb (5) N/A -0.7 μg/m3 (0) 6.0
 
Aug. 2, 2021, 9 a.m. 4.5 ppb (5) -0.5 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.33 ppb (4) N/A 1.1 μg/m3 (5) 5.0
 
Aug. 2, 2021, 8 a.m. 3.9 ppb (4) -0.7 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.32 ppb (4) N/A 0.8 μg/m3 (4) 5.0
 
Aug. 2, 2021, 7 a.m. 6.2 ppb (6) -0.8 ppb (0) N/A 7.0 ppb (7) N/A N/A N/A 0.38 ppb (5) N/A 26.7 μg/m3 (82) 82.0
 
Aug. 2, 2021, 6 a.m. 5.6 ppb (6) -0.8 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.39 ppb (5) N/A 27.1 μg/m3 (83) 83.0
 
Aug. 2, 2021, 5 a.m. 5.6 ppb (6) -0.8 ppb (0) N/A 7.0 ppb (7) N/A N/A N/A 0.39 ppb (5) N/A 22.7 μg/m3 (74) 74.0
 
Aug. 2, 2021, 4 a.m. 4.8 ppb (5) -0.8 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.39 ppb (5) N/A 24.6 μg/m3 (78) 78.0
 
Aug. 2, 2021, 3 a.m. 5.3 ppb (5) -0.8 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.39 ppb (5) N/A 19.7 μg/m3 (67) 67.0
 
Aug. 2, 2021, 2 a.m. 3.0 ppb (3) -0.9 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.35 ppb (4) N/A 23.9 μg/m3 (76) 76.0
 
Aug. 2, 2021, 1 a.m. 1.7 ppb (2) -0.9 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.36 ppb (5) N/A 42.2 μg/m3 (118) 118.0
 
Aug. 2, 2021, midnight 0.5 ppb (1) -0.8 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.36 ppb (5) N/A 38.6 μg/m3 (109) 109.0
 
Aug. 1, 2021, 11 p.m. 0.2 ppb (1) -0.8 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.34 ppb (4) N/A 35.0 μg/m3 (100) 100.0
 
Aug. 1, 2021, 10 p.m. 0.3 ppb (1) -0.7 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.35 ppb (4) N/A 35.6 μg/m3 (102) 102.0
 
Aug. 1, 2021, 9 p.m. 0.4 ppb (1) -0.7 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.35 ppb (4) N/A 37.6 μg/m3 (107) 107.0
 
Aug. 1, 2021, 8 p.m. -0.1 ppb (0) -0.8 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.33 ppb (4) N/A 26.0 μg/m3 (81) 81.0
 
Aug. 1, 2021, 7 p.m. 0.2 ppb (1) -0.7 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.34 ppb (4) N/A 33.6 μg/m3 (97) 97.0
 
Aug. 1, 2021, 6 p.m. 0.1 ppb (1) -0.7 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.34 ppb (4) N/A 31.9 μg/m3 (93) 93.0
 
Aug. 1, 2021, 5 p.m. 0.6 ppb (1) -0.6 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.33 ppb (4) N/A 30.8 μg/m3 (91) 91.0
 
Aug. 1, 2021, 4 p.m. 0.6 ppb (1) -0.7 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.3 ppb (4) N/A 25.3 μg/m3 (79) 79.0
 
Aug. 1, 2021, 3 p.m. 0.8 ppb (1) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.29 ppb (4) N/A 9.9 μg/m3 (42) 42.0
 
Aug. 1, 2021, 2 p.m. 2.1 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.32 ppb (4) N/A 20.8 μg/m3 (70) 70.0
 
Aug. 1, 2021, 1 p.m. 3.8 ppb (4) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.33 ppb (4) N/A 13.5 μg/m3 (54) 54.0
 
Aug. 1, 2021, noon 4.1 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.31 ppb (4) N/A 14.7 μg/m3 (57) 57.0
 
Aug. 1, 2021, 11 a.m. 2.6 ppb (3) -0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.28 ppb (4) N/A 12.3 μg/m3 (52) 52.0
 
Aug. 1, 2021, 10 a.m. 1.7 ppb (2) -0.6 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 26.3 μg/m3 (81) 81.0
 
Aug. 1, 2021, 9 a.m. 1.0 ppb (1) -0.9 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.3 ppb (4) N/A 19.7 μg/m3 (67) 67.0
 
Aug. 1, 2021, 8 a.m. 1.3 ppb (2) -0.9 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.3 ppb (4) N/A 18.5 μg/m3 (65) 65.0
 
Aug. 1, 2021, 7 a.m. 2.8 ppb (3) -0.9 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.28 ppb (4) N/A 16.7 μg/m3 (61) 61.0
 
Aug. 1, 2021, 6 a.m. 0.9 ppb (1) -0.9 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.27 ppb (4) N/A 14.8 μg/m3 (57) 57.0
 
Aug. 1, 2021, 5 a.m. 0.0 ppb (0) -0.9 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.26 ppb (4) N/A 6.6 μg/m3 (28) 28.0
 
Aug. 1, 2021, 4 a.m. 0.0 ppb (0) -0.9 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.23 ppb (3) N/A 14.6 μg/m3 (57) 57.0
 
Aug. 1, 2021, 3 a.m. 4.1 ppb (4) -0.8 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (3) N/A 13.9 μg/m3 (55) 55.0
 
Aug. 1, 2021, 2 a.m. 1.6 ppb (2) -0.8 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.2 ppb (3) N/A 11.5 μg/m3 (48) 48.0
 
Aug. 1, 2021, 1 a.m. 2.8 ppb (3) -0.8 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.22 ppb (3) N/A 14.9 μg/m3 (57) 57.0
 
Aug. 1, 2021, midnight 1.3 ppb (2) -0.8 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.22 ppb (3) N/A 22.5 μg/m3 (73) 73.0
 
July 31, 2021, 11 p.m. 1.6 ppb (2) -0.8 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.22 ppb (3) N/A 23.4 μg/m3 (75) 75.0
 
July 31, 2021, 10 p.m. 1.8 ppb (2) -0.6 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.23 ppb (3) N/A 22.0 μg/m3 (72) 72.0
 
July 31, 2021, 9 p.m. 3.6 ppb (4) -0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.26 ppb (4) N/A 24.0 μg/m3 (77) 77.0
 
July 31, 2021, 8 p.m. 4.4 ppb (5) 0.1 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.26 ppb (4) N/A 16.5 μg/m3 (61) 61.0
 
July 31, 2021, 7 p.m. 4.0 ppb (4) 0.4 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.27 ppb (4) N/A 15.1 μg/m3 (58) 58.0
 
July 31, 2021, 6 p.m. 9.5 ppb (9) 5.1 ppb (5) N/A 4.0 ppb (4) N/A N/A N/A 0.36 ppb (5) N/A 13.4 μg/m3 (54) 54.0
 
July 31, 2021, 5 p.m. 10.8 ppb (11) 5.1 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A 0.33 ppb (4) N/A 3.4 μg/m3 (15) 15.0
 
July 31, 2021, 4 p.m. 12.1 ppb (12) 4.0 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A 0.31 ppb (4) N/A 22.2 μg/m3 (73) 73.0
 
July 31, 2021, 3 p.m. 9.6 ppb (10) 1.5 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A 0.28 ppb (4) N/A 12.3 μg/m3 (52) 52.0
 
July 31, 2021, 2 p.m. 6.9 ppb (7) 0.3 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A 0.21 ppb (3) N/A 15.7 μg/m3 (59) 59.0
 
July 31, 2021, 1 p.m. 5.3 ppb (5) -0.2 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.24 ppb (3) N/A 14.8 μg/m3 (57) 57.0
 
July 31, 2021, noon 5.4 ppb (6) 0.6 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.25 ppb (3) N/A 9.9 μg/m3 (42) 42.0
 
July 31, 2021, 11 a.m. 4.2 ppb (4) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.26 ppb (4) N/A 14.5 μg/m3 (57) 57.0
 
July 31, 2021, 10 a.m. 4.0 ppb (4) -0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.23 ppb (3) N/A 17.8 μg/m3 (63) 63.0
 
July 31, 2021, 9 a.m. 6.1 ppb (6) -0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.27 ppb (4) N/A 19.8 μg/m3 (68) 68.0
 
July 31, 2021, 8 a.m. 4.5 ppb (5) -0.2 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.33 ppb (4) N/A 21.4 μg/m3 (71) 71.0
 
July 31, 2021, 7 a.m. 7.8 ppb (8) -0.2 ppb (0) N/A 8.0 ppb (8) N/A N/A N/A 0.35 ppb (4) N/A 17.7 μg/m3 (63) 63.0
 
July 31, 2021, 6 a.m. 6.6 ppb (7) -0.1 ppb (0) N/A 7.0 ppb (7) N/A N/A N/A 0.39 ppb (5) N/A 18.7 μg/m3 (65) 65.0
 
July 31, 2021, 5 a.m. 3.9 ppb (4) -0.6 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.31 ppb (4) N/A 18.5 μg/m3 (65) 65.0
 
July 31, 2021, 4 a.m. 2.6 ppb (3) -0.8 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.3 ppb (4) N/A 23.3 μg/m3 (75) 75.0
 
July 31, 2021, 3 a.m. 2.8 ppb (3) -0.8 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.31 ppb (4) N/A 23.9 μg/m3 (76) 76.0
 
July 31, 2021, 2 a.m. 1.7 ppb (2) -0.8 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.28 ppb (4) N/A 14.0 μg/m3 (55) 55.0
 
July 31, 2021, 1 a.m. 2.5 ppb (3) -0.8 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.32 ppb (4) N/A 10.9 μg/m3 (46) 46.0
 
July 31, 2021, midnight 2.3 ppb (3) -0.7 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.3 ppb (4) N/A 16.1 μg/m3 (60) 60.0
 
July 30, 2021, 11 p.m. 1.0 ppb (1) -0.7 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.26 ppb (4) N/A 19.2 μg/m3 (66) 66.0
 
July 30, 2021, 10 p.m. 1.1 ppb (2) -0.7 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.28 ppb (4) N/A 21.8 μg/m3 (72) 72.0
 
July 30, 2021, 9 p.m. 0.7 ppb (1) -0.7 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.3 ppb (4) N/A 28.7 μg/m3 (86) 86.0
 
July 30, 2021, 8 p.m. 2.5 ppb (3) -0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.32 ppb (4) N/A 26.5 μg/m3 (82) 82.0
 
July 30, 2021, 7 p.m. 3.9 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.38 ppb (5) N/A 27.4 μg/m3 (84) 84.0
 
July 30, 2021, 6 p.m. 5.7 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.35 ppb (4) N/A 27.1 μg/m3 (83) 83.0
 
July 30, 2021, 5 p.m. 2.1 ppb (2) -0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.32 ppb (4) N/A 28.3 μg/m3 (86) 86.0
 
July 30, 2021, 4 p.m. 2.4 ppb (3) -0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.28 ppb (4) N/A 19.3 μg/m3 (67) 67.0
 
July 30, 2021, 3 p.m. 3.0 ppb (3) -0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.27 ppb (4) N/A 0.0 μg/m3 (0) 4.0
 
July 30, 2021, 2 p.m. 3.7 ppb (4) 0.2 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.25 ppb (3) N/A 0.0 μg/m3 (0) 4.0
 
July 30, 2021, 1 p.m. 3.3 ppb (4) -0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.24 ppb (3) N/A 0.0 μg/m3 (0) 4.0
 
July 30, 2021, noon 5.1 ppb (5) 0.6 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.23 ppb (3) N/A 12.8 μg/m3 (53) 53.0
 
July 30, 2021, 11 a.m. 5.9 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (3) N/A 4.6 μg/m3 (20) 20.0
 
July 30, 2021, 10 a.m. 2.3 ppb (3) -0.8 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (3) N/A 7.8 μg/m3 (33) 33.0
 
July 30, 2021, 9 a.m. 0.6 ppb (1) -0.8 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 30, 2021, 8 a.m. 1.8 ppb (2) -0.7 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (3) N/A 11.1 μg/m3 (47) 47.0
 
July 30, 2021, 7 a.m. 2.3 ppb (3) -0.8 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (3) N/A 1.8 μg/m3 (8) 8.0
 
July 30, 2021, 6 a.m. 3.8 ppb (4) -0.7 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (3) N/A 4.2 μg/m3 (18) 18.0
 
July 30, 2021, 5 a.m. 4.9 ppb (5) -0.4 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.22 ppb (3) N/A 10.1 μg/m3 (43) 43.0
 
July 30, 2021, 4 a.m. 4.1 ppb (4) -0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.21 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 30, 2021, 3 a.m. 2.9 ppb (3) -0.8 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (3) N/A 16.2 μg/m3 (60) 60.0
 
July 30, 2021, 2 a.m. 6.4 ppb (7) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.3 ppb (4) N/A 15.0 μg/m3 (58) 58.0
 
July 30, 2021, 1 a.m. 5.7 ppb (6) 0.2 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.34 ppb (4) N/A 12.8 μg/m3 (53) 53.0
 
July 30, 2021, midnight 2.1 ppb (2) -0.6 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.26 ppb (4) N/A 14.5 μg/m3 (57) 57.0
 
July 29, 2021, 11 p.m. 6.3 ppb (6) 0.4 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.35 ppb (4) N/A 18.2 μg/m3 (64) 64.0
 
July 29, 2021, 10 p.m. 6.8 ppb (7) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.36 ppb (5) N/A 18.7 μg/m3 (65) 65.0
 
July 29, 2021, 9 p.m. 6.8 ppb (7) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.39 ppb (5) N/A 19.0 μg/m3 (66) 66.0
 
July 29, 2021, 8 p.m. 7.2 ppb (7) 1.5 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.37 ppb (5) N/A 19.5 μg/m3 (67) 67.0
 
July 29, 2021, 7 p.m. 9.3 ppb (9) 2.6 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A 0.34 ppb (4) N/A 16.3 μg/m3 (60) 60.0
 
July 29, 2021, 6 p.m. 12.7 ppb (12) 5.4 ppb (6) N/A 7.0 ppb (7) N/A N/A N/A 0.29 ppb (4) N/A 17.5 μg/m3 (63) 63.0
 
July 29, 2021, 5 p.m. 7.2 ppb (7) 1.2 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.27 ppb (4) N/A 14.3 μg/m3 (56) 56.0
 
July 29, 2021, 4 p.m. 4.7 ppb (5) 0.5 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.28 ppb (4) N/A 17.4 μg/m3 (63) 63.0
 
July 29, 2021, 3 p.m. 8.7 ppb (9) 2.9 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.34 ppb (4) N/A 15.6 μg/m3 (59) 59.0
 
July 29, 2021, 2 p.m. 13.7 ppb (13) 4.3 ppb (5) N/A 9.0 ppb (9) N/A N/A N/A 0.41 ppb (5) N/A 19.7 μg/m3 (67) 67.0
 
July 29, 2021, 1 p.m. 7.6 ppb (8) 1.5 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.36 ppb (5) N/A 14.4 μg/m3 (56) 56.0
 
July 29, 2021, noon 13.8 ppb (14) 6.8 ppb (7) N/A 7.0 ppb (7) N/A N/A N/A 0.46 ppb (6) N/A 18.8 μg/m3 (66) 66.0
 
July 29, 2021, 11 a.m. 14.0 ppb (14) 6.6 ppb (7) N/A 7.0 ppb (7) N/A N/A N/A 0.49 ppb (6) N/A 17.7 μg/m3 (63) 63.0
 
July 29, 2021, 10 a.m. 8.7 ppb (9) 2.3 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.32 ppb (4) N/A 17.0 μg/m3 (62) 62.0
 
July 29, 2021, 9 a.m. 12.1 ppb (12) 0.8 ppb (1) N/A 11.0 ppb (11) N/A N/A N/A 0.3 ppb (4) N/A 33.7 μg/m3 (97) 97.0
 
July 29, 2021, 8 a.m. 9.1 ppb (9) 0.1 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A 0.3 ppb (4) N/A 22.1 μg/m3 (73) 73.0
 
July 29, 2021, 7 a.m. 9.4 ppb (9) 0.1 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A 0.34 ppb (4) N/A 25.1 μg/m3 (79) 79.0
 
July 29, 2021, 6 a.m. 9.7 ppb (10) 0.4 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A 0.36 ppb (5) N/A 31.7 μg/m3 (93) 93.0
 
July 29, 2021, 5 a.m. 9.1 ppb (9) -0.3 ppb (0) N/A 9.0 ppb (9) N/A N/A N/A 0.4 ppb (5) N/A 28.4 μg/m3 (86) 86.0
 
July 29, 2021, 4 a.m. 10.2 ppb (10) -0.1 ppb (0) N/A 10.0 ppb (10) N/A N/A N/A 0.4 ppb (5) N/A 27.7 μg/m3 (84) 84.0
 
July 29, 2021, 3 a.m. 14.3 ppb (14) -0.1 ppb (0) N/A 14.0 ppb (14) N/A N/A N/A 0.42 ppb (5) N/A 34.0 μg/m3 (98) 98.0
 
July 29, 2021, 2 a.m. 14.4 ppb (14) 0.0 ppb (0) N/A 14.0 ppb (14) N/A N/A N/A 0.45 ppb (6) N/A 28.6 μg/m3 (86) 86.0
 
July 29, 2021, 1 a.m. 13.8 ppb (14) 0.3 ppb (1) N/A 14.0 ppb (14) N/A N/A N/A 0.5 ppb (6) N/A 30.8 μg/m3 (91) 91.0
 
July 29, 2021, midnight 10.6 ppb (10) -0.1 ppb (0) N/A 11.0 ppb (11) N/A N/A N/A 0.56 ppb (7) N/A 32.6 μg/m3 (95) 95.0
 
July 28, 2021, 11 p.m. 11.5 ppb (11) -0.1 ppb (0) N/A 12.0 ppb (12) N/A N/A N/A 0.52 ppb (6) N/A 34.3 μg/m3 (98) 98.0
 
July 28, 2021, 10 p.m. 6.2 ppb (6) -0.6 ppb (0) N/A 7.0 ppb (7) N/A N/A N/A 0.37 ppb (5) N/A 36.7 μg/m3 (104) 104.0
 
July 28, 2021, 9 p.m. 4.2 ppb (4) -0.4 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.34 ppb (4) N/A 24.8 μg/m3 (78) 78.0
 
July 28, 2021, 8 p.m. 1.3 ppb (2) -0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.25 ppb (3) N/A 17.1 μg/m3 (62) 62.0
 
July 28, 2021, 7 p.m. 5.0 ppb (5) 1.1 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.28 ppb (4) N/A 18.2 μg/m3 (64) 64.0
 
July 28, 2021, 6 p.m. 3.2 ppb (4) -0.5 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.31 ppb (4) N/A 20.2 μg/m3 (69) 69.0
 
July 28, 2021, 5 p.m. 7.1 ppb (7) 0.1 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A 0.39 ppb (5) N/A 23.5 μg/m3 (75) 75.0
 
July 28, 2021, 4 p.m. 4.6 ppb (5) -0.4 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.33 ppb (4) N/A 22.8 μg/m3 (74) 74.0
 
July 28, 2021, 3 p.m. 14.4 ppb (14) 2.6 ppb (3) N/A 12.0 ppb (12) N/A N/A N/A 0.39 ppb (5) N/A 21.0 μg/m3 (70) 70.0
 
July 28, 2021, 2 p.m. 20.2 ppb (20) 5.1 ppb (5) N/A 15.0 ppb (15) N/A N/A N/A 0.46 ppb (6) N/A 18.4 μg/m3 (65) 65.0
 
July 28, 2021, 1 p.m. 26.0 ppb (25) 9.0 ppb (9) N/A 17.0 ppb (17) N/A N/A N/A 0.55 ppb (7) N/A 30.9 μg/m3 (91) 91.0
 
July 28, 2021, noon 46.5 ppb (44) 24.4 ppb (24) N/A 22.0 ppb (21) N/A N/A N/A 0.75 ppb (10) N/A 20.0 μg/m3 (68) 68.0
 
July 28, 2021, 11 a.m. 64.1 ppb (62) 42.7 ppb (41) N/A 22.0 ppb (21) N/A N/A N/A 0.74 ppb (8) N/A 29.1 μg/m3 (87) 87.0
 
July 28, 2021, 10 a.m. 29.4 ppb (28) 12.2 ppb (12) N/A 17.0 ppb (17) N/A N/A N/A 0.52 ppb (6) N/A 23.9 μg/m3 (76) 76.0
 
July 28, 2021, 9 a.m. 22.9 ppb (22) 2.9 ppb (3) N/A 20.0 ppb (19) N/A N/A N/A 0.43 ppb (5) N/A 27.4 μg/m3 (84) 84.0
 
July 28, 2021, 8 a.m. 22.0 ppb (21) 1.3 ppb (2) N/A 21.0 ppb (20) N/A N/A N/A 0.46 ppb (6) N/A 20.3 μg/m3 (69) 69.0
 
July 28, 2021, 7 a.m. 25.0 ppb (24) 1.9 ppb (2) N/A 23.0 ppb (22) N/A N/A N/A 0.45 ppb (6) N/A 21.3 μg/m3 (71) 71.0
 
July 28, 2021, 6 a.m. 16.3 ppb (16) -0.6 ppb (0) N/A 17.0 ppb (17) N/A N/A N/A 0.43 ppb (5) N/A 26.7 μg/m3 (82) 82.0
 
July 28, 2021, 5 a.m. 16.8 ppb (16) -0.3 ppb (0) N/A 17.0 ppb (17) N/A N/A N/A 0.41 ppb (5) N/A 20.1 μg/m3 (68) 68.0
 
July 28, 2021, 4 a.m. 19.3 ppb (19) 0.3 ppb (1) N/A 19.0 ppb (18) N/A N/A N/A 0.47 ppb (6) N/A 26.4 μg/m3 (82) 82.0
 
July 28, 2021, 3 a.m. 19.9 ppb (19) 1.2 ppb (2) N/A 19.0 ppb (18) N/A N/A N/A 0.42 ppb (5) N/A 18.5 μg/m3 (65) 65.0
 
July 28, 2021, 2 a.m. 17.0 ppb (17) 1.9 ppb (2) N/A 15.0 ppb (15) N/A N/A N/A 0.49 ppb (6) N/A 17.7 μg/m3 (63) 63.0
 
July 28, 2021, 1 a.m. 10.1 ppb (10) 0.7 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A 0.45 ppb (6) N/A 15.9 μg/m3 (59) 59.0
 
July 28, 2021, midnight 11.0 ppb (11) 1.2 ppb (2) N/A 10.0 ppb (10) N/A N/A N/A 0.48 ppb (6) N/A 19.1 μg/m3 (66) 66.0
 
July 27, 2021, 11 p.m. 8.8 ppb (9) 0.7 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A 0.44 ppb (5) N/A 22.1 μg/m3 (73) 73.0