AQSQID: 295100094

Site Name: Forest Park

Location: Saint Louis (Forest Park), MO

Reporting: True, Located: True

Current AQI: 57.0

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
Jan. 24, 2020, midnight 44.8 ppb (41) 18.1 ppb (17) N/A 27.0 ppb (25) N/A N/A N/A 0.45 ppb (5) N/A 15.1 μg/m3 (57) 57.0
 
Jan. 23, 2020, 11 p.m. 43.1 ppb (40) 16.9 ppb (16) N/A 26.0 ppb (24) N/A N/A N/A 0.46 ppb (5) N/A 7.3 μg/m3 (30) 40.0
 
Jan. 23, 2020, 10 p.m. 33.6 ppb (31) 11.7 ppb (11) N/A 22.0 ppb (20) N/A N/A N/A 0.38 ppb (4) N/A 6.3 μg/m3 (26) 31.0
 
Jan. 23, 2020, 9 p.m. 38.0 ppb (35) 15.7 ppb (15) N/A 22.0 ppb (20) N/A N/A N/A 0.41 ppb (5) N/A 9.8 μg/m3 (41) 41.0
 
Jan. 23, 2020, 8 p.m. 38.1 ppb (35) 17.8 ppb (16) N/A 20.0 ppb (19) N/A N/A N/A 0.38 ppb (4) N/A 9.7 μg/m3 (40) 40.0
 
Jan. 23, 2020, 7 p.m. 35.4 ppb (33) 17.7 ppb (16) N/A 18.0 ppb (17) N/A N/A N/A 0.36 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 23, 2020, 6 p.m. 28.6 ppb (26) 13.7 ppb (13) N/A 15.0 ppb (14) N/A N/A N/A 0.35 ppb (4) N/A 11.2 μg/m3 (47) 47.0
 
Jan. 23, 2020, 5 p.m. 31.4 ppb (29) 15.0 ppb (14) N/A 17.0 ppb (16) N/A N/A N/A 0.38 ppb (4) N/A 13.4 μg/m3 (53) 53.0
 
Jan. 23, 2020, 4 p.m. 33.2 ppb (31) 16.1 ppb (15) N/A 17.0 ppb (16) N/A N/A N/A 0.35 ppb (4) N/A 9.4 μg/m3 (39) 39.0
 
Jan. 23, 2020, 3 p.m. 33.4 ppb (31) 16.1 ppb (15) N/A 17.0 ppb (16) N/A N/A N/A 0.39 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 23, 2020, 2 p.m. 43.3 ppb (40) 25.4 ppb (24) N/A 18.0 ppb (17) N/A N/A N/A 0.39 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 23, 2020, 1 p.m. 32.3 ppb (30) 14.0 ppb (13) N/A 18.0 ppb (17) N/A N/A N/A 0.38 ppb (4) N/A 11.3 μg/m3 (47) 47.0
 
Jan. 23, 2020, noon 23.8 ppb (22) 8.8 ppb (8) N/A 15.0 ppb (14) N/A N/A N/A 0.32 ppb (4) N/A 9.6 μg/m3 (40) 40.0
 
Jan. 23, 2020, 11 a.m. 17.6 ppb (16) 4.7 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.26 ppb (3) N/A 8.7 μg/m3 (36) 36.0
 
Jan. 23, 2020, 10 a.m. 11.4 ppb (11) 2.5 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 9.3 μg/m3 (39) 39.0
 
Jan. 23, 2020, 9 a.m. 11.8 ppb (11) 2.5 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 11.4 μg/m3 (48) 48.0
 
Jan. 23, 2020, 8 a.m. 11.0 ppb (10) 2.2 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 6.6 μg/m3 (28) 28.0
 
Jan. 23, 2020, 7 a.m. 11.5 ppb (11) 1.4 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A 0.22 ppb (2) N/A 11.7 μg/m3 (49) 49.0
 
Jan. 23, 2020, 6 a.m. 12.4 ppb (11) 2.1 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.22 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 23, 2020, 5 a.m. 10.8 ppb (10) 2.0 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.22 ppb (2) N/A 6.9 μg/m3 (29) 29.0
 
Jan. 23, 2020, 4 a.m. 10.7 ppb (10) 2.2 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.22 ppb (2) N/A 9.2 μg/m3 (38) 38.0
 
Jan. 23, 2020, 3 a.m. 12.0 ppb (11) 3.6 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 10.3 μg/m3 (43) 43.0
 
Jan. 23, 2020, 2 a.m. 13.3 ppb (12) 3.7 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.26 ppb (3) N/A 11.5 μg/m3 (48) 48.0
 
Jan. 23, 2020, 1 a.m. 15.5 ppb (14) 4.9 ppb (5) N/A 11.0 ppb (10) N/A N/A N/A 0.26 ppb (3) N/A 10.7 μg/m3 (45) 45.0
 
Jan. 23, 2020, midnight 18.1 ppb (17) 5.8 ppb (5) N/A 12.0 ppb (11) N/A N/A N/A 0.28 ppb (3) N/A 8.2 μg/m3 (34) 34.0
 
Jan. 22, 2020, 11 p.m. 16.3 ppb (15) 5.5 ppb (5) N/A 11.0 ppb (10) N/A N/A N/A 0.29 ppb (3) N/A 12.1 μg/m3 (50) 50.0
 
Jan. 22, 2020, 10 p.m. 17.4 ppb (16) 7.5 ppb (7) N/A 10.0 ppb (9) N/A N/A N/A 0.31 ppb (3) N/A 8.5 μg/m3 (35) 35.0
 
Jan. 22, 2020, 9 p.m. 16.2 ppb (15) 7.7 ppb (7) N/A 9.0 ppb (8) N/A N/A N/A 0.28 ppb (3) N/A 11.4 μg/m3 (48) 48.0
 
Jan. 22, 2020, 8 p.m. 24.6 ppb (23) 13.5 ppb (12) N/A 11.0 ppb (10) N/A N/A N/A 0.33 ppb (4) N/A 9.8 μg/m3 (41) 41.0
 
Jan. 22, 2020, 7 p.m. 22.2 ppb (21) 12.3 ppb (11) N/A 10.0 ppb (9) N/A N/A N/A 0.3 ppb (3) N/A 9.8 μg/m3 (41) 41.0
 
Jan. 22, 2020, 6 p.m. 24.4 ppb (23) 13.2 ppb (12) N/A 11.0 ppb (10) N/A N/A N/A 0.32 ppb (4) N/A 5.7 μg/m3 (24) 24.0
 
Jan. 22, 2020, 5 p.m. 22.9 ppb (21) 13.3 ppb (12) N/A 10.0 ppb (9) N/A N/A N/A 0.3 ppb (3) N/A 12.4 μg/m3 (51) 51.0
 
Jan. 22, 2020, 4 p.m. 24.8 ppb (23) 13.5 ppb (12) N/A 12.0 ppb (11) N/A N/A N/A 0.33 ppb (4) N/A 15.3 μg/m3 (57) 57.0
 
Jan. 22, 2020, 3 p.m. 27.9 ppb (26) 14.1 ppb (13) N/A 14.0 ppb (13) N/A N/A N/A 0.34 ppb (4) N/A 17.4 μg/m3 (61) 61.0
 
Jan. 22, 2020, 2 p.m. 34.8 ppb (32) 17.5 ppb (16) N/A 17.0 ppb (16) N/A N/A N/A 0.42 ppb (5) N/A 17.7 μg/m3 (62) 62.0
 
Jan. 22, 2020, 1 p.m. 57.1 ppb (53) 32.9 ppb (30) N/A 24.0 ppb (22) N/A N/A N/A 0.45 ppb (5) N/A 21.4 μg/m3 (70) 70.0
 
Jan. 22, 2020, noon 37.4 ppb (35) 17.9 ppb (17) N/A 20.0 ppb (19) N/A N/A N/A 0.49 ppb (5) N/A 18.0 μg/m3 (63) 63.0
 
Jan. 22, 2020, 11 a.m. 26.5 ppb (25) 11.1 ppb (10) N/A 15.0 ppb (14) N/A N/A N/A 0.36 ppb (4) N/A 16.3 μg/m3 (59) 59.0
 
Jan. 22, 2020, 10 a.m. 15.2 ppb (14) 4.0 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.22 ppb (2) N/A 16.3 μg/m3 (59) 59.0
 
Jan. 22, 2020, 9 a.m. 14.3 ppb (13) 2.9 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A 0.22 ppb (2) N/A 12.9 μg/m3 (52) 52.0
 
Jan. 22, 2020, 8 a.m. 17.0 ppb (16) 2.7 ppb (3) N/A 14.0 ppb (13) N/A N/A N/A 0.22 ppb (2) N/A 12.9 μg/m3 (52) 52.0
 
Jan. 22, 2020, 7 a.m. 14.4 ppb (13) 2.5 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.22 ppb (2) N/A 16.4 μg/m3 (59) 59.0
 
Jan. 22, 2020, 6 a.m. 15.4 ppb (14) 2.7 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.27 ppb (3) N/A 13.1 μg/m3 (52) 52.0
 
Jan. 22, 2020, 5 a.m. 12.0 ppb (11) 2.9 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 12.5 μg/m3 (51) 51.0
 
Jan. 22, 2020, 4 a.m. 11.6 ppb (11) 3.1 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.22 ppb (2) N/A 14.8 μg/m3 (56) 56.0
 
Jan. 22, 2020, 3 a.m. 14.4 ppb (13) 4.9 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A 0.25 ppb (3) N/A 11.9 μg/m3 (50) 50.0
 
Jan. 22, 2020, 2 a.m. 15.4 ppb (14) 5.9 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A 0.24 ppb (3) N/A 8.8 μg/m3 (37) 37.0
 
Jan. 22, 2020, 1 a.m. 21.3 ppb (20) 8.2 ppb (8) N/A 13.0 ppb (12) N/A N/A N/A 0.3 ppb (3) N/A 14.9 μg/m3 (56) 56.0
 
Jan. 22, 2020, midnight 25.9 ppb (24) 9.6 ppb (9) N/A 16.0 ppb (15) N/A N/A N/A 0.35 ppb (4) N/A 11.5 μg/m3 (48) 48.0
 
Jan. 21, 2020, 11 p.m. 21.3 ppb (20) 8.6 ppb (8) N/A 13.0 ppb (12) N/A N/A N/A 0.29 ppb (3) N/A 0.0 μg/m3 (0) 20.0
 
Jan. 21, 2020, 10 p.m. 21.7 ppb (20) 10.4 ppb (10) N/A 11.0 ppb (10) N/A N/A N/A 0.29 ppb (3) N/A 0.0 μg/m3 (0) 20.0
 
Jan. 21, 2020, 9 p.m. 24.2 ppb (22) 14.3 ppb (13) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A N/A 22.0
 
Jan. 21, 2020, 8 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Jan. 21, 2020, 7 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 10.6 μg/m3 (44) 44.0
 
Jan. 21, 2020, 6 p.m. N/A N/A N/A N/A N/A N/A N/A 0.3 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 21, 2020, 5 p.m. N/A N/A N/A N/A N/A N/A N/A 0.31 ppb (3) N/A 14.9 μg/m3 (56) 56.0
 
Jan. 21, 2020, 4 p.m. 46.2 ppb (43) 28.4 ppb (26) N/A 18.0 ppb (17) N/A N/A N/A 0.4 ppb (4) N/A 27.8 μg/m3 (84) 84.0
 
Jan. 21, 2020, 3 p.m. 45.3 ppb (42) 25.5 ppb (24) N/A 20.0 ppb (19) N/A N/A N/A 0.46 ppb (5) N/A 17.9 μg/m3 (63) 63.0
 
Jan. 21, 2020, 2 p.m. 31.7 ppb (29) 13.5 ppb (12) N/A 18.0 ppb (17) N/A N/A N/A 0.32 ppb (4) N/A 17.0 μg/m3 (61) 61.0
 
Jan. 21, 2020, 1 p.m. 35.3 ppb (33) 15.0 ppb (14) N/A 20.0 ppb (19) N/A N/A N/A 0.33 ppb (4) N/A 18.9 μg/m3 (65) 65.0
 
Jan. 21, 2020, noon 16.8 ppb (16) 3.2 ppb (3) N/A 14.0 ppb (13) N/A N/A N/A 0.26 ppb (3) N/A 14.4 μg/m3 (55) 55.0
 
Jan. 21, 2020, 11 a.m. 16.9 ppb (16) 2.6 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A 0.24 ppb (3) N/A 12.9 μg/m3 (52) 52.0
 
Jan. 21, 2020, 10 a.m. 18.2 ppb (17) 1.8 ppb (2) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 9.3 μg/m3 (39) 39.0
 
Jan. 21, 2020, 9 a.m. 19.5 ppb (18) 2.1 ppb (2) N/A 17.0 ppb (16) N/A N/A N/A 0.26 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
Jan. 21, 2020, 8 a.m. 18.8 ppb (17) 3.5 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.23 ppb (3) N/A 17.0 μg/m3 (61) 61.0
 
Jan. 21, 2020, 7 a.m. 12.5 ppb (12) 1.5 ppb (1) N/A 11.0 ppb (10) N/A N/A N/A 0.22 ppb (2) N/A 11.5 μg/m3 (48) 48.0
 
Jan. 20, 2020, 7 p.m. 9.6 ppb (9) 3.8 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 11.1 μg/m3 (46) 46.0
 
Jan. 20, 2020, 6 p.m. 9.9 ppb (9) 3.9 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 9.2 μg/m3 (38) 38.0
 
Jan. 20, 2020, 5 p.m. 9.5 ppb (9) 4.5 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
Jan. 20, 2020, 4 p.m. 7.9 ppb (7) 3.9 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (2) N/A 6.3 μg/m3 (26) 26.0
 
Jan. 20, 2020, 3 p.m. 8.2 ppb (8) 3.6 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.22 ppb (2) N/A 7.4 μg/m3 (31) 31.0
 
Jan. 20, 2020, 2 p.m. 7.7 ppb (7) 2.2 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 5.8 μg/m3 (24) 24.0
 
Jan. 20, 2020, 1 p.m. 6.2 ppb (6) 1.3 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 20, 2020, noon 9.6 ppb (9) 3.4 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A 3.4 μg/m3 (14) 14.0
 
Jan. 20, 2020, 8 a.m. 4.1 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (2) N/A 4.2 μg/m3 (18) 18.0
 
Jan. 20, 2020, 7 a.m. 3.6 ppb (3) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (2) N/A 5.2 μg/m3 (22) 22.0
 
Jan. 20, 2020, 6 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (2) N/A 2.7 μg/m3 (11) 11.0
 
Jan. 20, 2020, 5 a.m. 3.9 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (2) N/A 8.2 μg/m3 (34) 34.0
 
Jan. 20, 2020, 4 a.m. 3.7 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (2) N/A 4.2 μg/m3 (18) 18.0
 
Jan. 20, 2020, 3 a.m. 4.9 ppb (5) 1.4 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (2) N/A 4.7 μg/m3 (20) 20.0
 
Jan. 20, 2020, 2 a.m. 4.4 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.2 ppb (2) N/A 5.2 μg/m3 (22) 22.0
 
Jan. 20, 2020, 1 a.m. 4.0 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 20, 2020, midnight 4.0 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 19, 2020, 11 p.m. 3.7 ppb (3) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.21 ppb (2) N/A 2.7 μg/m3 (11) 11.0
 
Jan. 19, 2020, 10 p.m. 3.1 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.19 ppb (2) N/A 6.3 μg/m3 (26) 26.0
 
Jan. 19, 2020, 9 p.m. 2.9 ppb (3) 1.2 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.19 ppb (2) N/A 4.4 μg/m3 (18) 18.0
 
Jan. 19, 2020, 8 p.m. 2.8 ppb (3) 1.4 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2020, 7 p.m. 3.0 ppb (3) 1.5 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 2.1 μg/m3 (9) 9.0
 
Jan. 19, 2020, 6 p.m. 2.5 ppb (2) 1.3 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A 3.3 μg/m3 (14) 14.0
 
Jan. 19, 2020, 5 p.m. 3.7 ppb (3) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (2) N/A 4.7 μg/m3 (20) 20.0
 
Jan. 19, 2020, 4 p.m. 3.0 ppb (3) 1.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A 3.3 μg/m3 (14) 14.0
 
Jan. 19, 2020, 3 p.m. 2.6 ppb (2) 1.3 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A 2.5 μg/m3 (10) 10.0
 
Jan. 19, 2020, 2 p.m. 2.4 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A 7.8 μg/m3 (32) 32.0
 
Jan. 19, 2020, 1 p.m. 2.9 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (2) N/A 4.6 μg/m3 (19) 19.0
 
Jan. 19, 2020, noon 4.8 ppb (4) 1.5 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2020, 11 a.m. 2.5 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (2) N/A 6.2 μg/m3 (26) 26.0
 
Jan. 19, 2020, 10 a.m. 2.3 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 7.9 μg/m3 (33) 33.0
 
Jan. 19, 2020, 9 a.m. 2.1 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.15 ppb (2) N/A 6.2 μg/m3 (26) 26.0
 
Jan. 19, 2020, 8 a.m. 2.7 ppb (3) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.17 ppb (2) N/A 6.4 μg/m3 (27) 27.0
 
Jan. 19, 2020, 7 a.m. 2.1 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.15 ppb (2) N/A 6.4 μg/m3 (27) 27.0
 
Jan. 19, 2020, 6 a.m. 2.1 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.15 ppb (2) N/A 7.4 μg/m3 (31) 31.0
 
Jan. 19, 2020, 5 a.m. 2.6 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.15 ppb (2) N/A 5.7 μg/m3 (24) 24.0
 
Jan. 19, 2020, 4 a.m. 3.1 ppb (3) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (2) N/A 1.5 μg/m3 (6) 6.0
 
Jan. 19, 2020, 3 a.m. 2.8 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (2) N/A 3.8 μg/m3 (16) 16.0
 
Jan. 19, 2020, 2 a.m. 2.4 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (2) N/A 2.1 μg/m3 (9) 9.0
 
Jan. 19, 2020, 1 a.m. 3.2 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (2) N/A 3.9 μg/m3 (16) 16.0
 
Jan. 19, 2020, midnight 3.0 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (2) N/A 3.6 μg/m3 (15) 15.0
 
Jan. 18, 2020, 11 p.m. 3.6 ppb (3) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (2) N/A 4.7 μg/m3 (20) 20.0
 
Jan. 18, 2020, 10 p.m. 4.1 ppb (4) 1.4 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (2) N/A 2.1 μg/m3 (9) 9.0
 
Jan. 18, 2020, 9 p.m. 6.3 ppb (6) 3.1 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (2) N/A 7.1 μg/m3 (30) 30.0
 
Jan. 18, 2020, 8 p.m. 8.5 ppb (8) 4.8 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.23 ppb (3) N/A 4.1 μg/m3 (17) 17.0
 
Jan. 18, 2020, 7 p.m. 5.6 ppb (5) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.21 ppb (2) N/A 4.1 μg/m3 (17) 17.0
 
Jan. 18, 2020, 6 p.m. 4.7 ppb (4) 2.6 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.2 ppb (2) N/A 0.0 μg/m3 (0) 4.0
 
Jan. 18, 2020, 5 p.m. 9.1 ppb (8) 5.6 ppb (5) N/A 4.0 ppb (4) N/A N/A N/A 0.25 ppb (3) N/A 1.5 μg/m3 (6) 8.0
 
Jan. 18, 2020, 4 p.m. 7.5 ppb (7) 3.9 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.23 ppb (3) N/A 0.6 μg/m3 (2) 7.0
 
Jan. 18, 2020, 3 p.m. 6.3 ppb (6) 3.4 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.2 ppb (2) N/A -0.2 μg/m3 (0) 6.0
 
Jan. 18, 2020, 2 p.m. 7.0 ppb (6) 3.8 ppb (4) N/A 3.0 ppb (3) N/A N/A N/A 0.2 ppb (2) N/A 3.3 μg/m3 (14) 14.0
 
Jan. 18, 2020, 1 p.m. 10.4 ppb (10) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 2.5 μg/m3 (10) 10.0
 
Jan. 18, 2020, noon 12.7 ppb (12) 2.8 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.24 ppb (3) N/A 0.6 μg/m3 (2) 12.0
 
Jan. 18, 2020, 11 a.m. 8.7 ppb (8) 1.7 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 3.3 μg/m3 (14) 14.0
 
Jan. 18, 2020, 10 a.m. 7.9 ppb (7) 1.4 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 0.7 μg/m3 (3) 7.0
 
Jan. 18, 2020, 9 a.m. 16.5 ppb (15) 2.8 ppb (3) N/A 14.0 ppb (13) N/A N/A N/A 0.27 ppb (3) N/A 7.3 μg/m3 (30) 30.0
 
Jan. 18, 2020, 8 a.m. 17.0 ppb (16) 3.3 ppb (3) N/A 14.0 ppb (13) N/A N/A N/A 0.25 ppb (3) N/A 14.4 μg/m3 (55) 55.0
 
Jan. 18, 2020, 7 a.m. 10.7 ppb (10) 2.4 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.22 ppb (2) N/A 0.1 μg/m3 (0) 10.0
 
Jan. 18, 2020, 6 a.m. 8.6 ppb (8) 1.9 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2020, 5 a.m. 9.4 ppb (9) 2.0 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
 
Jan. 18, 2020, 4 a.m. 11.8 ppb (11) 3.6 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.21 ppb (2) N/A 6.2 μg/m3 (26) 26.0
 
Jan. 18, 2020, 3 a.m. 14.7 ppb (14) 5.4 ppb (5) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 9.5 μg/m3 (40) 40.0
 
Jan. 18, 2020, 2 a.m. 17.3 ppb (16) 7.1 ppb (7) N/A 10.0 ppb (9) N/A N/A N/A 0.23 ppb (3) N/A 11.1 μg/m3 (46) 46.0
 
Jan. 18, 2020, 1 a.m. 16.3 ppb (15) 6.7 ppb (6) N/A 10.0 ppb (9) N/A N/A N/A 0.23 ppb (3) N/A 11.9 μg/m3 (50) 50.0
 
Jan. 18, 2020, midnight 19.5 ppb (18) 7.5 ppb (7) N/A 12.0 ppb (11) N/A N/A N/A 0.25 ppb (3) N/A 11.1 μg/m3 (46) 46.0
 
Jan. 17, 2020, 11 p.m. 23.7 ppb (22) 9.7 ppb (9) N/A 14.0 ppb (13) N/A N/A N/A 0.28 ppb (3) N/A 15.4 μg/m3 (57) 57.0
 
Jan. 17, 2020, 10 p.m. 23.5 ppb (22) 9.9 ppb (9) N/A 14.0 ppb (13) N/A N/A N/A 0.27 ppb (3) N/A 19.0 μg/m3 (65) 65.0
 
Jan. 17, 2020, 9 p.m. 24.0 ppb (22) 10.9 ppb (10) N/A 13.0 ppb (12) N/A N/A N/A 0.27 ppb (3) N/A 12.6 μg/m3 (51) 51.0
 
Jan. 17, 2020, 8 p.m. 21.0 ppb (19) 10.2 ppb (9) N/A 11.0 ppb (10) N/A N/A N/A 0.25 ppb (3) N/A 11.3 μg/m3 (47) 47.0
 
Jan. 17, 2020, 7 p.m. 22.1 ppb (20) 11.0 ppb (10) N/A 11.0 ppb (10) N/A N/A N/A 0.26 ppb (3) N/A 10.8 μg/m3 (45) 45.0
 
Jan. 17, 2020, 6 p.m. 28.5 ppb (26) 16.6 ppb (15) N/A 12.0 ppb (11) N/A N/A N/A 0.28 ppb (3) N/A 5.3 μg/m3 (22) 26.0
 
Jan. 17, 2020, 5 p.m. 24.7 ppb (23) 14.3 ppb (13) N/A 11.0 ppb (10) N/A N/A N/A 0.31 ppb (3) N/A 10.8 μg/m3 (45) 45.0
 
Jan. 17, 2020, 4 p.m. 26.3 ppb (24) 15.5 ppb (14) N/A 11.0 ppb (10) N/A N/A N/A 0.28 ppb (3) N/A 11.4 μg/m3 (48) 48.0
 
Jan. 17, 2020, 3 p.m. 90.1 ppb (88) 68.2 ppb (65) N/A 22.0 ppb (20) N/A N/A N/A 0.3 ppb (3) N/A 14.4 μg/m3 (55) 88.0
 
Jan. 17, 2020, 2 p.m. 115.1 ppb (103) 88.4 ppb (87) N/A 27.0 ppb (25) N/A N/A N/A 0.32 ppb (4) N/A 16.8 μg/m3 (60) 103.0
 
Jan. 17, 2020, 1 p.m. 177.8 ppb (115) 134.7 ppb (106) N/A 44.0 ppb (41) N/A N/A N/A 0.44 ppb (5) N/A 16.7 μg/m3 (60) 115.0
 
Jan. 17, 2020, noon 16.6 ppb (15) 7.0 ppb (6) N/A 10.0 ppb (9) N/A N/A N/A 0.22 ppb (2) N/A 6.9 μg/m3 (29) 29.0
 
Jan. 17, 2020, 11 a.m. 19.4 ppb (18) 10.1 ppb (9) N/A 9.0 ppb (8) N/A N/A N/A 0.15 ppb (2) N/A 8.6 μg/m3 (36) 36.0
 
Jan. 17, 2020, 10 a.m. 16.1 ppb (15) 7.4 ppb (7) N/A 9.0 ppb (8) N/A N/A N/A N/A N/A 3.9 μg/m3 (16) 16.0
 
Jan. 17, 2020, 9 a.m. 16.0 ppb (15) 8.1 ppb (8) N/A 8.0 ppb (7) N/A N/A N/A 0.14 ppb (2) N/A 4.5 μg/m3 (19) 19.0
 
Jan. 17, 2020, 8 a.m. 19.9 ppb (18) 8.6 ppb (8) N/A 11.0 ppb (10) N/A N/A N/A 0.18 ppb (2) N/A 3.9 μg/m3 (16) 18.0
 
Jan. 17, 2020, 7 a.m. 11.0 ppb (10) 3.4 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.18 ppb (2) N/A 6.5 μg/m3 (27) 27.0
 
Jan. 17, 2020, 6 a.m. 13.3 ppb (12) 5.0 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A 0.18 ppb (2) N/A 4.6 μg/m3 (19) 19.0
 
Jan. 17, 2020, 5 a.m. 10.6 ppb (10) 3.9 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A 0.16 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 17, 2020, 4 a.m. 7.1 ppb (7) 1.8 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.16 ppb (2) N/A 2.8 μg/m3 (12) 12.0
 
Jan. 17, 2020, 3 a.m. 10.4 ppb (10) 3.7 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A 0.16 ppb (2) N/A 0.0 μg/m3 (0) 10.0
 
Jan. 17, 2020, 2 a.m. 6.3 ppb (6) 1.9 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (2) N/A 7.3 μg/m3 (30) 30.0
 
Jan. 17, 2020, 1 a.m. 6.8 ppb (6) 1.1 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A N/A 6.0
 
Jan. 17, 2020, midnight 7.5 ppb (7) 1.5 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 8.5 μg/m3 (35) 35.0
 
Jan. 16, 2020, 11 p.m. 10.8 ppb (10) 1.4 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 5.9 μg/m3 (25) 25.0
 
Jan. 16, 2020, 10 p.m. 8.3 ppb (8) 1.5 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 16, 2020, 9 p.m. 11.2 ppb (10) 4.3 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 6.8 μg/m3 (28) 28.0
 
Jan. 16, 2020, 8 p.m. 10.9 ppb (10) 5.7 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (2) N/A 9.6 μg/m3 (40) 40.0
 
Jan. 16, 2020, 7 p.m. 24.2 ppb (22) 15.4 ppb (14) N/A 9.0 ppb (8) N/A N/A N/A 0.24 ppb (3) N/A 8.7 μg/m3 (36) 36.0
 
Jan. 16, 2020, 6 p.m. 8.9 ppb (8) 4.7 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (2) N/A 5.3 μg/m3 (22) 22.0
 
Jan. 16, 2020, 5 p.m. 14.4 ppb (13) 8.2 ppb (8) N/A 6.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 6.8 μg/m3 (28) 28.0
 
Jan. 16, 2020, 4 p.m. 13.5 ppb (12) 7.7 ppb (7) N/A 6.0 ppb (6) N/A N/A N/A 0.24 ppb (3) N/A 6.1 μg/m3 (25) 25.0
 
Jan. 16, 2020, 3 p.m. 16.8 ppb (16) 9.2 ppb (9) N/A 8.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A 9.4 μg/m3 (39) 39.0
 
Jan. 16, 2020, 2 p.m. 17.2 ppb (16) 8.4 ppb (8) N/A 9.0 ppb (8) N/A N/A N/A 0.2 ppb (2) N/A 8.4 μg/m3 (35) 35.0
 
Jan. 16, 2020, 1 p.m. 32.2 ppb (30) 17.9 ppb (17) N/A 15.0 ppb (14) N/A N/A N/A 0.22 ppb (2) N/A 14.0 μg/m3 (54) 54.0
 
Jan. 16, 2020, noon 15.3 ppb (14) 7.7 ppb (7) N/A 8.0 ppb (7) N/A N/A N/A 0.2 ppb (2) N/A 13.6 μg/m3 (53) 53.0
 
Jan. 16, 2020, 11 a.m. 4.1 ppb (4) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.15 ppb (2) N/A 10.7 μg/m3 (45) 45.0