ID: 2215

AQSQID: 295100094

Site Name: Forest Park

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

Updated: Jan. 23, 2021, 10:31 a.m.

Location: Saint Louis (Forest Park), MO

Reporting: True, Located: True

Current AQI: 18.0

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. 23, 2021, 9 a.m. 11.9 ppb (12) 2.7 ppb (3) N/A 9.0 ppb (9) N/A N/A N/A 0.2 ppb (3) N/A 4.1 μg/m3 (18) 18.0
 
Jan. 23, 2021, 8 a.m. 8.6 ppb (9) 2.5 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.17 ppb (3) N/A 3.7 μg/m3 (16) 16.0
 
Jan. 23, 2021, 7 a.m. 8.5 ppb (9) 1.6 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.18 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 23, 2021, 6 a.m. 6.8 ppb (7) 0.3 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A 0.19 ppb (3) N/A 3.7 μg/m3 (16) 16.0
 
Jan. 23, 2021, 5 a.m. 6.5 ppb (7) 0.5 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (3) N/A 7.6 μg/m3 (32) 32.0
 
Jan. 23, 2021, 4 a.m. 6.1 ppb (6) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (3) N/A 6.1 μg/m3 (26) 26.0
 
Jan. 23, 2021, 3 a.m. 6.2 ppb (6) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.19 ppb (3) N/A 5.6 μg/m3 (24) 24.0
 
Jan. 23, 2021, 2 a.m. 6.1 ppb (6) 0.8 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (3) N/A 5.4 μg/m3 (23) 23.0
 
Jan. 23, 2021, 1 a.m. 7.9 ppb (8) 0.8 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A 0.2 ppb (3) N/A 3.1 μg/m3 (13) 13.0
 
Jan. 23, 2021, midnight 10.3 ppb (10) 1.0 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A 0.21 ppb (3) N/A 4.5 μg/m3 (19) 19.0
 
Jan. 22, 2021, 11 p.m. 7.7 ppb (8) 0.7 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A 0.19 ppb (3) N/A 2.9 μg/m3 (13) 13.0
 
Jan. 22, 2021, 10 p.m. 3.5 ppb (4) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (3) N/A 4.9 μg/m3 (21) 21.0
 
Jan. 22, 2021, 9 p.m. 6.1 ppb (6) 2.5 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (3) N/A 0.6 μg/m3 (3) 6.0
 
Jan. 22, 2021, 8 p.m. 6.3 ppb (6) 3.3 ppb (4) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (3) N/A 1.9 μg/m3 (8) 8.0
 
Jan. 22, 2021, 7 p.m. 5.0 ppb (5) 2.1 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (3) N/A 1.4 μg/m3 (6) 6.0
 
Jan. 22, 2021, 6 p.m. 5.7 ppb (6) 2.8 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (3) N/A 2.1 μg/m3 (9) 9.0
 
Jan. 22, 2021, 5 p.m. 5.5 ppb (6) 2.6 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (3) N/A 2.9 μg/m3 (13) 13.0
 
Jan. 22, 2021, 4 p.m. 9.5 ppb (9) 5.2 ppb (5) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (3) N/A 1.9 μg/m3 (8) 9.0
 
Jan. 22, 2021, 3 p.m. 10.0 ppb (10) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.19 ppb (3) N/A 3.1 μg/m3 (13) 13.0
 
Jan. 22, 2021, 2 p.m. 10.3 ppb (10) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.19 ppb (3) N/A 3.5 μg/m3 (15) 15.0
 
Jan. 22, 2021, 1 p.m. 27.9 ppb (27) 15.4 ppb (15) N/A 13.0 ppb (13) N/A N/A N/A 0.26 ppb (4) N/A 4.8 μg/m3 (20) 27.0
 
Jan. 22, 2021, noon 8.9 ppb (9) 2.2 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A 0.22 ppb (3) N/A 5.8 μg/m3 (25) 25.0
 
Jan. 22, 2021, 11 a.m. 10.3 ppb (10) 2.1 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 22, 2021, 10 a.m. 8.3 ppb (8) 1.4 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.2 ppb (3) N/A 2.2 μg/m3 (10) 10.0
 
Jan. 22, 2021, 9 a.m. 9.1 ppb (9) 1.8 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 22, 2021, 8 a.m. 5.6 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (3) N/A -0.1 μg/m3 (0) 6.0
 
Jan. 22, 2021, 7 a.m. 4.2 ppb (4) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (3) N/A -0.4 μg/m3 (0) 4.0
 
Jan. 22, 2021, 6 a.m. 3.7 ppb (4) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (3) N/A 3.4 μg/m3 (15) 15.0
 
Jan. 22, 2021, 5 a.m. 9.0 ppb (9) 0.6 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A 0.2 ppb (3) N/A 5.8 μg/m3 (25) 25.0
 
Jan. 22, 2021, 4 a.m. 26.3 ppb (25) 4.4 ppb (5) N/A 22.0 ppb (21) N/A N/A N/A 0.45 ppb (6) N/A 10.6 μg/m3 (45) 45.0
 
Jan. 22, 2021, 3 a.m. 28.2 ppb (27) 4.8 ppb (5) N/A 23.0 ppb (22) N/A N/A N/A 0.47 ppb (6) N/A 10.8 μg/m3 (46) 46.0
 
Jan. 22, 2021, 2 a.m. 30.1 ppb (29) 6.4 ppb (7) N/A 24.0 ppb (23) N/A N/A N/A 0.45 ppb (6) N/A 10.9 μg/m3 (46) 46.0
 
Jan. 22, 2021, 1 a.m. 28.2 ppb (27) 7.1 ppb (7) N/A 21.0 ppb (20) N/A N/A N/A 0.45 ppb (6) N/A 10.7 μg/m3 (45) 45.0
 
Jan. 22, 2021, midnight 31.8 ppb (30) 7.1 ppb (7) N/A 25.0 ppb (24) N/A N/A N/A 0.52 ppb (6) N/A 3.6 μg/m3 (16) 30.0
 
Jan. 21, 2021, 11 p.m. 35.5 ppb (34) 10.6 ppb (10) N/A 25.0 ppb (24) N/A N/A N/A 0.59 ppb (7) N/A 3.2 μg/m3 (14) 34.0
 
Jan. 21, 2021, 10 p.m. 20.7 ppb (20) 6.3 ppb (6) N/A 14.0 ppb (14) N/A N/A N/A 0.4 ppb (5) N/A 2.6 μg/m3 (11) 20.0
 
Jan. 21, 2021, 9 p.m. 20.6 ppb (20) 8.6 ppb (9) N/A 12.0 ppb (12) N/A N/A N/A 0.33 ppb (4) N/A 4.3 μg/m3 (18) 20.0
 
Jan. 21, 2021, 8 p.m. 17.7 ppb (17) 8.8 ppb (9) N/A 9.0 ppb (9) N/A N/A N/A 0.31 ppb (4) N/A 4.6 μg/m3 (20) 20.0
 
Jan. 21, 2021, 7 p.m. 16.7 ppb (16) 8.1 ppb (8) N/A 9.0 ppb (9) N/A N/A N/A 0.3 ppb (4) N/A 8.8 μg/m3 (37) 37.0
 
Jan. 21, 2021, 6 p.m. 18.1 ppb (18) 9.4 ppb (9) N/A 9.0 ppb (9) N/A N/A N/A 0.27 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
Jan. 21, 2021, 5 p.m. 33.0 ppb (32) 21.8 ppb (21) N/A 13.0 ppb (13) N/A N/A N/A 0.3 ppb (4) N/A 8.7 μg/m3 (37) 37.0
 
Jan. 21, 2021, 4 p.m. 23.5 ppb (23) 13.1 ppb (13) N/A 11.0 ppb (11) N/A N/A N/A 0.29 ppb (4) N/A 7.2 μg/m3 (31) 31.0
 
Jan. 21, 2021, 3 p.m. 26.1 ppb (25) 14.5 ppb (14) N/A 12.0 ppb (12) N/A N/A N/A 0.31 ppb (4) N/A 4.8 μg/m3 (20) 25.0
 
Jan. 21, 2021, 2 p.m. 37.6 ppb (36) 19.5 ppb (19) N/A 18.0 ppb (17) N/A N/A N/A 0.41 ppb (5) N/A 9.2 μg/m3 (39) 39.0
 
Jan. 21, 2021, 1 p.m. 43.5 ppb (42) 21.8 ppb (21) N/A 22.0 ppb (21) N/A N/A N/A 0.53 ppb (6) N/A 12.5 μg/m3 (52) 52.0
 
Jan. 21, 2021, noon 28.7 ppb (28) 10.1 ppb (10) N/A 19.0 ppb (18) N/A N/A N/A 0.4 ppb (5) N/A 5.1 μg/m3 (22) 28.0
 
Jan. 21, 2021, 11 a.m. 17.6 ppb (17) 5.1 ppb (5) N/A 13.0 ppb (13) N/A N/A N/A 0.28 ppb (4) N/A 6.7 μg/m3 (28) 28.0
 
Jan. 21, 2021, 10 a.m. 9.8 ppb (10) 2.1 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A 0.19 ppb (3) N/A 2.8 μg/m3 (12) 12.0
 
Jan. 21, 2021, 9 a.m. 8.3 ppb (8) 1.6 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.18 ppb (3) N/A 3.5 μg/m3 (15) 15.0
 
Jan. 21, 2021, 8 a.m. 6.4 ppb (7) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.18 ppb (3) N/A 5.8 μg/m3 (25) 25.0
 
Jan. 21, 2021, 7 a.m. 6.5 ppb (7) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.18 ppb (3) N/A 2.5 μg/m3 (11) 11.0
 
Jan. 21, 2021, 6 a.m. 18.4 ppb (18) 0.7 ppb (1) N/A 18.0 ppb (17) N/A N/A N/A 0.2 ppb (3) N/A 6.2 μg/m3 (26) 26.0
 
Jan. 21, 2021, 5 a.m. 14.7 ppb (14) 1.1 ppb (2) N/A 14.0 ppb (14) N/A N/A N/A 0.19 ppb (3) N/A 2.7 μg/m3 (12) 14.0
 
Jan. 21, 2021, 4 a.m. 13.5 ppb (13) 1.5 ppb (2) N/A 12.0 ppb (12) N/A N/A N/A 0.2 ppb (3) N/A 3.4 μg/m3 (15) 15.0
 
Jan. 21, 2021, 3 a.m. 7.8 ppb (8) 1.8 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (3) N/A 5.1 μg/m3 (22) 22.0
 
Jan. 21, 2021, 2 a.m. 7.8 ppb (8) 2.1 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 21, 2021, 1 a.m. 10.3 ppb (10) 2.5 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A 0.22 ppb (3) N/A 4.1 μg/m3 (18) 18.0
 
Jan. 21, 2021, midnight 12.0 ppb (12) 3.8 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A 0.25 ppb (3) N/A 1.7 μg/m3 (8) 12.0
 
Jan. 20, 2021, 11 p.m. 16.3 ppb (16) 5.8 ppb (6) N/A 11.0 ppb (11) N/A N/A N/A 0.3 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 20, 2021, 10 p.m. 20.7 ppb (20) 8.4 ppb (8) N/A 12.0 ppb (12) N/A N/A N/A 0.34 ppb (4) N/A 5.6 μg/m3 (24) 24.0
 
Jan. 20, 2021, 9 p.m. 21.6 ppb (21) 10.4 ppb (10) N/A 11.0 ppb (11) N/A N/A N/A 0.35 ppb (4) N/A 8.3 μg/m3 (35) 35.0
 
Jan. 20, 2021, 8 p.m. 16.6 ppb (16) 9.2 ppb (9) N/A 7.0 ppb (7) N/A N/A N/A 0.27 ppb (4) N/A 4.2 μg/m3 (18) 18.0
 
Jan. 20, 2021, 7 p.m. 16.2 ppb (16) 8.8 ppb (9) N/A 7.0 ppb (7) N/A N/A N/A 0.27 ppb (4) N/A 4.4 μg/m3 (19) 19.0
 
Jan. 20, 2021, 6 p.m. 18.8 ppb (18) 10.5 ppb (10) N/A 8.0 ppb (8) N/A N/A N/A 0.27 ppb (4) N/A 9.9 μg/m3 (42) 42.0
 
Jan. 20, 2021, 5 p.m. 23.9 ppb (23) 13.6 ppb (13) N/A 10.0 ppb (10) N/A N/A N/A 0.29 ppb (4) N/A 6.1 μg/m3 (26) 26.0
 
Jan. 20, 2021, 4 p.m. 19.9 ppb (19) 10.9 ppb (11) N/A 9.0 ppb (9) N/A N/A N/A 0.29 ppb (4) N/A 7.6 μg/m3 (32) 32.0
 
Jan. 20, 2021, 3 p.m. 27.1 ppb (26) 14.2 ppb (14) N/A 13.0 ppb (13) N/A N/A N/A 0.28 ppb (4) N/A 7.7 μg/m3 (33) 33.0
 
Jan. 20, 2021, 2 p.m. 39.7 ppb (38) 20.2 ppb (20) N/A 20.0 ppb (19) N/A N/A N/A 0.4 ppb (5) N/A 7.8 μg/m3 (33) 38.0
 
Jan. 20, 2021, 1 p.m. 61.8 ppb (60) 34.0 ppb (33) N/A 28.0 ppb (27) N/A N/A N/A 0.67 ppb (8) N/A 4.4 μg/m3 (19) 60.0
 
Jan. 20, 2021, noon 38.5 ppb (37) 15.1 ppb (15) N/A 23.0 ppb (22) N/A N/A N/A 0.43 ppb (5) N/A 5.7 μg/m3 (24) 37.0
 
Jan. 20, 2021, 11 a.m. 20.5 ppb (20) 4.2 ppb (4) N/A 16.0 ppb (16) N/A N/A N/A 0.26 ppb (4) N/A 10.7 μg/m3 (45) 45.0
 
Jan. 20, 2021, 10 a.m. 9.6 ppb (10) 1.3 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A 0.25 ppb (3) N/A 1.7 μg/m3 (8) 10.0
 
Jan. 20, 2021, 9 a.m. 6.6 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.22 ppb (3) N/A 1.7 μg/m3 (8) 8.0
 
Jan. 20, 2021, 8 a.m. 5.3 ppb (5) 0.7 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.19 ppb (3) N/A 6.3 μg/m3 (27) 27.0
 
Jan. 20, 2021, 7 a.m. 4.6 ppb (5) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (3) N/A 3.5 μg/m3 (15) 15.0
 
Jan. 20, 2021, 6 a.m. 3.2 ppb (4) 0.4 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (3) N/A 4.9 μg/m3 (21) 21.0
 
Jan. 20, 2021, 5 a.m. 3.8 ppb (4) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (3) N/A 3.3 μg/m3 (14) 14.0
 
Jan. 20, 2021, 4 a.m. 4.2 ppb (4) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (3) N/A 4.3 μg/m3 (18) 18.0
 
Jan. 20, 2021, 3 a.m. 11.6 ppb (11) 3.1 ppb (3) N/A 9.0 ppb (9) N/A N/A N/A 0.25 ppb (3) N/A 5.9 μg/m3 (25) 25.0
 
Jan. 20, 2021, 2 a.m. 13.0 ppb (13) 3.7 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A 0.26 ppb (4) N/A 9.6 μg/m3 (40) 40.0
 
Jan. 20, 2021, 1 a.m. 13.8 ppb (14) 3.8 ppb (4) N/A 10.0 ppb (10) N/A N/A N/A 0.29 ppb (4) N/A 13.3 μg/m3 (54) 54.0
 
Jan. 20, 2021, midnight 16.9 ppb (16) 4.9 ppb (5) N/A 12.0 ppb (12) N/A N/A N/A 0.33 ppb (4) N/A 8.7 μg/m3 (37) 37.0
 
Jan. 19, 2021, 11 p.m. 16.3 ppb (16) 6.4 ppb (7) N/A 10.0 ppb (10) N/A N/A N/A 0.31 ppb (4) N/A 8.6 μg/m3 (36) 36.0
 
Jan. 19, 2021, 10 p.m. 14.7 ppb (14) 6.4 ppb (7) N/A 8.0 ppb (8) N/A N/A N/A 0.32 ppb (4) N/A 9.6 μg/m3 (40) 40.0
 
Jan. 19, 2021, 9 p.m. 17.5 ppb (17) 9.7 ppb (10) N/A 8.0 ppb (8) N/A N/A N/A 0.3 ppb (4) N/A 6.9 μg/m3 (29) 29.0
 
Jan. 19, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A N/A 0.27 ppb (4) N/A 13.2 μg/m3 (54) 54.0
 
Jan. 19, 2021, 7 p.m. 14.8 ppb (14) 8.1 ppb (8) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 14.0
 
Jan. 19, 2021, 6 p.m. 16.5 ppb (16) 9.0 ppb (9) N/A 8.0 ppb (8) N/A N/A N/A 0.28 ppb (4) N/A N/A 16.0
 
Jan. 19, 2021, 5 p.m. 20.8 ppb (20) 11.6 ppb (11) N/A 9.0 ppb (9) N/A N/A N/A 0.28 ppb (4) N/A 12.4 μg/m3 (52) 52.0
 
Jan. 19, 2021, 4 p.m. 23.5 ppb (23) 13.1 ppb (13) N/A 11.0 ppb (11) N/A N/A N/A 0.29 ppb (4) N/A 12.4 μg/m3 (52) 52.0
 
Jan. 19, 2021, 3 p.m. 35.2 ppb (34) 20.6 ppb (20) N/A 15.0 ppb (15) N/A N/A N/A 0.36 ppb (5) N/A 12.5 μg/m3 (52) 52.0
 
Jan. 19, 2021, 2 p.m. 40.3 ppb (39) 23.3 ppb (22) N/A 17.0 ppb (17) N/A N/A N/A 0.5 ppb (6) N/A 10.9 μg/m3 (46) 46.0
 
Jan. 19, 2021, 1 p.m. 54.9 ppb (52) 33.1 ppb (32) N/A 22.0 ppb (21) N/A N/A N/A 0.5 ppb (6) N/A 9.8 μg/m3 (41) 52.0
 
Jan. 19, 2021, noon 41.8 ppb (40) 20.5 ppb (20) N/A 21.0 ppb (20) N/A N/A N/A 0.45 ppb (6) N/A 8.4 μg/m3 (36) 40.0
 
Jan. 19, 2021, 11 a.m. 26.1 ppb (25) 8.2 ppb (8) N/A 18.0 ppb (17) N/A N/A N/A 0.31 ppb (4) N/A 9.4 μg/m3 (40) 40.0
 
Jan. 19, 2021, 10 a.m. 12.0 ppb (12) 1.8 ppb (2) N/A 10.0 ppb (10) N/A N/A N/A 0.26 ppb (4) N/A 8.4 μg/m3 (36) 36.0
 
Jan. 19, 2021, 9 a.m. 17.5 ppb (17) 2.5 ppb (3) N/A 15.0 ppb (15) N/A N/A N/A 0.3 ppb (4) N/A 8.2 μg/m3 (35) 35.0
 
Jan. 19, 2021, 8 a.m. 13.9 ppb (14) 0.9 ppb (1) N/A 13.0 ppb (13) N/A N/A N/A 0.24 ppb (3) N/A 6.8 μg/m3 (29) 29.0
 
Jan. 19, 2021, 7 a.m. 10.5 ppb (10) 0.8 ppb (1) N/A 10.0 ppb (10) N/A N/A N/A 0.25 ppb (3) N/A 7.7 μg/m3 (33) 33.0
 
Jan. 19, 2021, 6 a.m. 7.8 ppb (8) 0.4 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A 0.22 ppb (3) N/A 6.2 μg/m3 (26) 26.0
 
Jan. 19, 2021, 5 a.m. 7.1 ppb (7) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (3) N/A 1.7 μg/m3 (8) 8.0
 
Jan. 19, 2021, 4 a.m. 8.4 ppb (8) 1.1 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.22 ppb (3) N/A 7.3 μg/m3 (31) 31.0
 
Jan. 19, 2021, 3 a.m. 13.8 ppb (14) 1.5 ppb (2) N/A 12.0 ppb (12) N/A N/A N/A 0.23 ppb (3) N/A 5.7 μg/m3 (24) 24.0
 
Jan. 19, 2021, 2 a.m. 20.5 ppb (20) 4.4 ppb (5) N/A 16.0 ppb (16) N/A N/A N/A 0.29 ppb (4) N/A 6.2 μg/m3 (26) 26.0
 
Jan. 19, 2021, 1 a.m. 14.1 ppb (14) 1.1 ppb (2) N/A 13.0 ppb (13) N/A N/A N/A 0.28 ppb (4) N/A 6.1 μg/m3 (26) 26.0
 
Jan. 19, 2021, midnight 11.8 ppb (12) 0.8 ppb (1) N/A 11.0 ppb (11) N/A N/A N/A 0.26 ppb (4) N/A 3.2 μg/m3 (14) 14.0
 
Jan. 18, 2021, 11 p.m. 9.8 ppb (10) 1.0 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A 0.23 ppb (3) N/A 1.3 μg/m3 (6) 10.0
 
Jan. 18, 2021, 10 p.m. 7.8 ppb (8) 1.3 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.22 ppb (3) N/A 2.1 μg/m3 (9) 9.0
 
Jan. 18, 2021, 9 p.m. 15.5 ppb (15) 5.8 ppb (6) N/A 10.0 ppb (10) N/A N/A N/A 0.29 ppb (4) N/A 3.1 μg/m3 (13) 15.0
 
Jan. 18, 2021, 8 p.m. 13.9 ppb (14) 5.5 ppb (6) N/A 8.0 ppb (8) N/A N/A N/A 0.29 ppb (4) N/A 0.8 μg/m3 (4) 14.0
 
Jan. 18, 2021, 7 p.m. 13.3 ppb (13) 5.0 ppb (5) N/A 8.0 ppb (8) N/A N/A N/A 0.26 ppb (4) N/A 4.1 μg/m3 (18) 18.0
 
Jan. 18, 2021, 6 p.m. 11.9 ppb (12) 4.8 ppb (5) N/A 7.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 4.3 μg/m3 (18) 18.0
 
Jan. 18, 2021, 5 p.m. 16.9 ppb (16) 8.3 ppb (8) N/A 9.0 ppb (9) N/A N/A N/A 0.26 ppb (4) N/A 2.6 μg/m3 (11) 16.0
 
Jan. 18, 2021, 4 p.m. 18.3 ppb (18) 8.6 ppb (9) N/A 10.0 ppb (10) N/A N/A N/A 0.28 ppb (4) N/A 8.4 μg/m3 (36) 36.0
 
Jan. 18, 2021, 3 p.m. 23.6 ppb (23) 12.1 ppb (12) N/A 12.0 ppb (12) N/A N/A N/A 0.31 ppb (4) N/A 9.2 μg/m3 (39) 39.0
 
Jan. 18, 2021, 2 p.m. 49.1 ppb (47) 24.9 ppb (24) N/A 24.0 ppb (23) N/A N/A N/A 0.42 ppb (5) N/A 11.4 μg/m3 (48) 48.0
 
Jan. 18, 2021, 1 p.m. 60.2 ppb (58) 29.8 ppb (29) N/A 31.0 ppb (30) N/A N/A N/A 0.53 ppb (6) N/A 9.1 μg/m3 (38) 58.0
 
Jan. 18, 2021, noon 25.7 ppb (25) 8.8 ppb (9) N/A 17.0 ppb (17) N/A N/A N/A 0.34 ppb (4) N/A 5.6 μg/m3 (24) 25.0
 
Jan. 18, 2021, 11 a.m. 13.0 ppb (13) 4.3 ppb (5) N/A 9.0 ppb (9) N/A N/A N/A 0.22 ppb (3) N/A 5.7 μg/m3 (24) 24.0
 
Jan. 18, 2021, 10 a.m. 7.3 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.18 ppb (3) N/A 8.3 μg/m3 (35) 35.0
 
Jan. 18, 2021, 9 a.m. 6.4 ppb (7) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.17 ppb (3) N/A 12.2 μg/m3 (52) 52.0
 
Jan. 18, 2021, 8 a.m. 6.1 ppb (6) 0.5 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.17 ppb (3) N/A 9.5 μg/m3 (40) 40.0
 
Jan. 18, 2021, 7 a.m. 3.9 ppb (4) 0.1 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.16 ppb (3) N/A 10.9 μg/m3 (46) 46.0
 
Jan. 18, 2021, 6 a.m. 5.2 ppb (5) 0.4 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.18 ppb (3) N/A 11.8 μg/m3 (50) 50.0
 
Jan. 18, 2021, 5 a.m. 9.5 ppb (9) 1.7 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A 0.2 ppb (3) N/A 10.6 μg/m3 (45) 45.0
 
Jan. 18, 2021, 4 a.m. 7.7 ppb (8) 0.7 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A 0.22 ppb (3) N/A 13.8 μg/m3 (55) 55.0
 
Jan. 18, 2021, 3 a.m. 5.6 ppb (6) 0.5 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (3) N/A 8.3 μg/m3 (35) 35.0
 
Jan. 18, 2021, 2 a.m. 6.5 ppb (7) 0.6 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (3) N/A 15.2 μg/m3 (58) 58.0
 
Jan. 18, 2021, 1 a.m. 8.2 ppb (8) 1.3 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.22 ppb (3) N/A 8.7 μg/m3 (37) 37.0
 
Jan. 18, 2021, midnight 11.1 ppb (11) 2.2 ppb (3) N/A 9.0 ppb (9) N/A N/A N/A 0.25 ppb (3) N/A 11.5 μg/m3 (48) 48.0
 
Jan. 17, 2021, 11 p.m. 11.1 ppb (11) 2.9 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A 0.27 ppb (4) N/A 6.8 μg/m3 (29) 29.0
 
Jan. 17, 2021, 10 p.m. 9.4 ppb (9) 2.4 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A 0.22 ppb (3) N/A 6.9 μg/m3 (29) 29.0
 
Jan. 17, 2021, 9 p.m. 5.7 ppb (6) 1.4 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (3) N/A 3.6 μg/m3 (16) 16.0
 
Jan. 17, 2021, 8 p.m. 3.9 ppb (4) 1.3 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (3) N/A 3.4 μg/m3 (15) 15.0
 
Jan. 17, 2021, 7 p.m. 5.7 ppb (6) 2.7 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.21 ppb (3) N/A 3.1 μg/m3 (13) 13.0
 
Jan. 17, 2021, 6 p.m. 7.1 ppb (7) 3.7 ppb (4) N/A 3.0 ppb (3) N/A N/A N/A 0.22 ppb (3) N/A 3.1 μg/m3 (13) 13.0
 
Jan. 17, 2021, 5 p.m. 6.6 ppb (7) 3.6 ppb (4) N/A 3.0 ppb (3) N/A N/A N/A 0.22 ppb (3) N/A 3.4 μg/m3 (15) 15.0
 
Jan. 17, 2021, 4 p.m. 6.7 ppb (7) 3.1 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.22 ppb (3) N/A 5.3 μg/m3 (23) 23.0
 
Jan. 17, 2021, 3 p.m. 5.4 ppb (6) 2.2 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (3) N/A 5.6 μg/m3 (24) 24.0
 
Jan. 17, 2021, 2 p.m. 3.4 ppb (4) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (3) N/A 0.9 μg/m3 (4) 4.0
 
Jan. 17, 2021, 1 p.m. 3.2 ppb (4) 0.4 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (3) N/A 1.8 μg/m3 (8) 8.0
 
Jan. 17, 2021, noon 4.4 ppb (5) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (3) N/A 6.7 μg/m3 (28) 28.0
 
Jan. 17, 2021, 11 a.m. 4.6 ppb (5) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (3) N/A 5.9 μg/m3 (25) 25.0
 
Jan. 17, 2021, 10 a.m. 3.8 ppb (4) 0.3 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 6.4 μg/m3 (27) 27.0
 
Jan. 17, 2021, 9 a.m. 3.5 ppb (4) 0.2 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (3) N/A 5.3 μg/m3 (23) 23.0
 
Jan. 17, 2021, 8 a.m. 2.9 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 17, 2021, 7 a.m. 3.3 ppb (4) 0.1 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (3) N/A 7.5 μg/m3 (32) 32.0
 
Jan. 17, 2021, 6 a.m. 6.8 ppb (7) 1.8 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.22 ppb (3) N/A 6.7 μg/m3 (28) 28.0
 
Jan. 17, 2021, 5 a.m. 7.2 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.25 ppb (3) N/A 4.6 μg/m3 (20) 20.0
 
Jan. 17, 2021, 4 a.m. 6.9 ppb (7) 1.6 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.23 ppb (3) N/A 5.4 μg/m3 (23) 23.0
 
Jan. 17, 2021, 3 a.m. 6.4 ppb (7) 1.5 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 17, 2021, 2 a.m. 7.4 ppb (7) 2.6 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.25 ppb (3) N/A 9.6 μg/m3 (40) 40.0
 
Jan. 17, 2021, 1 a.m. 9.2 ppb (9) 3.3 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.26 ppb (4) N/A 7.3 μg/m3 (31) 31.0
 
Jan. 17, 2021, midnight 11.1 ppb (11) 4.0 ppb (4) N/A 7.0 ppb (7) N/A N/A N/A 0.29 ppb (4) N/A 7.6 μg/m3 (32) 32.0
 
Jan. 16, 2021, 11 p.m. 11.0 ppb (11) 4.5 ppb (5) N/A 7.0 ppb (7) N/A N/A N/A 0.29 ppb (4) N/A 6.7 μg/m3 (28) 28.0
 
Jan. 16, 2021, 10 p.m. 8.7 ppb (9) 3.1 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.26 ppb (4) N/A 8.6 μg/m3 (36) 36.0
 
Jan. 16, 2021, 9 p.m. 9.4 ppb (9) 3.9 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.27 ppb (4) N/A 7.2 μg/m3 (31) 31.0
 
Jan. 16, 2021, 8 p.m. 10.3 ppb (10) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.28 ppb (4) N/A 6.4 μg/m3 (27) 27.0
 
Jan. 16, 2021, 7 p.m. 9.6 ppb (10) 4.6 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.26 ppb (4) N/A 4.1 μg/m3 (18) 18.0
 
Jan. 16, 2021, 6 p.m. 10.4 ppb (10) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.26 ppb (4) N/A 2.7 μg/m3 (12) 12.0
 
Jan. 16, 2021, 5 p.m. 10.9 ppb (11) 6.1 ppb (6) N/A 5.0 ppb (5) N/A N/A N/A 0.29 ppb (4) N/A 4.9 μg/m3 (21) 21.0
 
Jan. 16, 2021, 4 p.m. 9.4 ppb (9) 4.4 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.26 ppb (4) N/A 6.6 μg/m3 (28) 28.0
 
Jan. 16, 2021, 3 p.m. 8.9 ppb (9) 4.3 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.25 ppb (3) N/A 3.1 μg/m3 (13) 13.0
 
Jan. 16, 2021, 2 p.m. 11.0 ppb (11) 4.5 ppb (5) N/A 7.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 3.5 μg/m3 (15) 15.0
 
Jan. 16, 2021, 1 p.m. 7.2 ppb (7) 1.5 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (3) N/A 8.9 μg/m3 (38) 38.0
 
Jan. 16, 2021, noon 5.3 ppb (5) 0.4 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.18 ppb (3) N/A 4.5 μg/m3 (19) 19.0
 
Jan. 16, 2021, 11 a.m. 4.0 ppb (4) 0.3 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (3) N/A 5.1 μg/m3 (22) 22.0
 
Jan. 16, 2021, 10 a.m. 3.9 ppb (4) 0.4 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (3) N/A 8.1 μg/m3 (34) 34.0