ID: 2215

AQSQID: 295100094

Site Name: Forest Park

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

Updated: April 22, 2021, 10:44 a.m.

Location: Saint Louis (Forest Park), MO

Reporting: True, Located: True

Current AQI: 24.0

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
April 22, 2021, 9 a.m. 12.6 ppb (12) 0.8 ppb (1) N/A 12.0 ppb (12) N/A N/A N/A 0.19 ppb (3) N/A 5.6 μg/m3 (24) 24.0
 
April 22, 2021, 8 a.m. 7.7 ppb (8) 0.4 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A 0.16 ppb (3) N/A 4.5 μg/m3 (19) 19.0
 
April 22, 2021, 7 a.m. 8.3 ppb (8) 0.3 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A 0.16 ppb (3) N/A 3.0 μg/m3 (13) 13.0
 
April 22, 2021, 6 a.m. 7.2 ppb (7) 0.1 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A 0.17 ppb (3) N/A 5.4 μg/m3 (23) 23.0
 
April 22, 2021, 5 a.m. 12.3 ppb (12) 0.9 ppb (1) N/A 11.0 ppb (11) N/A N/A N/A 0.23 ppb (3) N/A 6.9 μg/m3 (29) 29.0
 
April 22, 2021, 4 a.m. 25.4 ppb (24) 3.6 ppb (4) N/A 22.0 ppb (21) N/A N/A N/A 0.4 ppb (5) N/A 7.1 μg/m3 (30) 30.0
 
April 22, 2021, 3 a.m. 14.0 ppb (14) 0.6 ppb (1) N/A 14.0 ppb (14) N/A N/A N/A 0.26 ppb (4) N/A 4.9 μg/m3 (21) 21.0
 
April 22, 2021, 2 a.m. 9.1 ppb (9) 0.4 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A 0.23 ppb (3) N/A 3.7 μg/m3 (16) 16.0
 
April 22, 2021, 1 a.m. 13.3 ppb (13) 2.9 ppb (3) N/A 11.0 ppb (11) N/A N/A N/A 0.28 ppb (4) N/A 6.1 μg/m3 (26) 26.0
 
April 22, 2021, midnight 4.9 ppb (5) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (3) N/A 3.7 μg/m3 (16) 16.0
 
April 21, 2021, 11 p.m. 4.6 ppb (5) 0.8 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (3) N/A 4.5 μg/m3 (19) 19.0
 
April 21, 2021, 10 p.m. 5.4 ppb (6) 1.4 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (3) N/A 7.6 μg/m3 (32) 32.0
 
April 21, 2021, 9 p.m. 8.3 ppb (8) 2.9 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (3) N/A 9.3 μg/m3 (39) 39.0
 
April 21, 2021, 8 p.m. 14.2 ppb (14) 6.0 ppb (6) N/A 8.0 ppb (8) N/A N/A N/A 0.26 ppb (4) N/A 7.2 μg/m3 (31) 31.0
 
April 21, 2021, 7 p.m. 14.8 ppb (14) 7.1 ppb (7) N/A 8.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 5.2 μg/m3 (22) 22.0
 
April 21, 2021, 6 p.m. 6.7 ppb (7) 3.1 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (3) N/A 8.8 μg/m3 (37) 37.0
 
April 21, 2021, 5 p.m. 9.5 ppb (9) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (3) N/A 2.2 μg/m3 (10) 10.0
 
April 21, 2021, 4 p.m. 10.1 ppb (10) 4.8 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.18 ppb (3) N/A 3.3 μg/m3 (14) 14.0
 
April 21, 2021, 3 p.m. 14.7 ppb (14) 7.7 ppb (8) N/A 7.0 ppb (7) N/A N/A N/A 0.2 ppb (3) N/A 5.3 μg/m3 (23) 23.0
 
April 21, 2021, 2 p.m. 14.8 ppb (14) 7.4 ppb (7) N/A 7.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
April 21, 2021, 1 p.m. 22.7 ppb (22) 11.2 ppb (11) N/A 12.0 ppb (12) N/A N/A N/A 0.3 ppb (4) N/A 4.3 μg/m3 (18) 22.0
 
April 21, 2021, noon 31.8 ppb (30) 16.3 ppb (16) N/A 16.0 ppb (16) N/A N/A N/A 0.36 ppb (5) N/A 3.7 μg/m3 (16) 30.0
 
April 21, 2021, 11 a.m. 30.8 ppb (30) 11.0 ppb (11) N/A 20.0 ppb (19) N/A N/A N/A 0.37 ppb (5) N/A 5.8 μg/m3 (25) 30.0
 
April 21, 2021, 10 a.m. 22.6 ppb (22) 6.4 ppb (7) N/A 16.0 ppb (16) N/A N/A N/A 0.27 ppb (4) N/A 5.4 μg/m3 (23) 23.0
 
April 21, 2021, 9 a.m. 7.4 ppb (7) 0.4 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A 0.17 ppb (3) N/A 3.1 μg/m3 (13) 13.0
 
April 21, 2021, 8 a.m. 5.8 ppb (6) 0.1 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.15 ppb (2) N/A 4.6 μg/m3 (20) 20.0
 
April 21, 2021, 7 a.m. 6.7 ppb (7) 0.4 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.15 ppb (2) N/A 6.1 μg/m3 (26) 26.0
 
April 21, 2021, 6 a.m. 8.7 ppb (9) 0.8 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A 0.18 ppb (3) N/A 7.1 μg/m3 (30) 30.0
 
April 21, 2021, 5 a.m. 14.7 ppb (14) 2.1 ppb (2) N/A 13.0 ppb (13) N/A N/A N/A 0.24 ppb (3) N/A 3.5 μg/m3 (15) 15.0
 
April 21, 2021, 4 a.m. 13.4 ppb (13) 1.7 ppb (2) N/A 12.0 ppb (12) N/A N/A N/A 0.25 ppb (3) N/A 6.2 μg/m3 (26) 26.0
 
April 21, 2021, 3 a.m. 11.4 ppb (11) 0.7 ppb (1) N/A 11.0 ppb (11) N/A N/A N/A 0.24 ppb (3) N/A 6.3 μg/m3 (27) 27.0
 
April 21, 2021, 2 a.m. 10.0 ppb (10) 0.3 ppb (1) N/A 10.0 ppb (10) N/A N/A N/A 0.21 ppb (3) N/A 5.6 μg/m3 (24) 24.0
 
April 21, 2021, 1 a.m. 8.2 ppb (8) 0.4 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A 0.19 ppb (3) N/A 1.4 μg/m3 (6) 8.0
 
April 21, 2021, midnight 7.8 ppb (8) 1.1 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.2 ppb (3) N/A 3.4 μg/m3 (15) 15.0
 
April 20, 2021, 11 p.m. 6.3 ppb (6) 1.3 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.19 ppb (3) N/A 3.6 μg/m3 (16) 16.0
 
April 20, 2021, 10 p.m. 8.8 ppb (9) 2.4 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (3) N/A 1.2 μg/m3 (5) 9.0
 
April 20, 2021, 9 p.m. 10.1 ppb (10) 2.5 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A 0.22 ppb (3) N/A 3.7 μg/m3 (16) 16.0
 
April 20, 2021, 8 p.m. 9.9 ppb (10) 3.2 ppb (4) N/A 7.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 5.6 μg/m3 (24) 24.0
 
April 20, 2021, 7 p.m. 8.9 ppb (9) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (3) N/A 2.8 μg/m3 (12) 12.0
 
April 20, 2021, 6 p.m. 9.5 ppb (9) 3.5 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.18 ppb (3) N/A 2.2 μg/m3 (10) 10.0
 
April 20, 2021, 5 p.m. 8.2 ppb (8) 2.5 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.18 ppb (3) N/A 5.7 μg/m3 (24) 24.0
 
April 20, 2021, 4 p.m. 6.4 ppb (7) 1.9 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.16 ppb (3) N/A 5.5 μg/m3 (23) 23.0
 
April 20, 2021, 3 p.m. 7.7 ppb (8) 3.6 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.15 ppb (2) N/A 3.2 μg/m3 (14) 14.0
 
April 20, 2021, 2 p.m. 4.1 ppb (4) 1.6 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (3) N/A 4.3 μg/m3 (18) 18.0
 
April 20, 2021, 1 p.m. 5.7 ppb (6) 1.7 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (3) N/A 3.0 μg/m3 (13) 13.0
 
April 20, 2021, noon 6.3 ppb (6) 1.5 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.18 ppb (3) N/A 8.2 μg/m3 (35) 35.0
 
April 20, 2021, 11 a.m. 3.2 ppb (4) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (3) N/A 3.8 μg/m3 (16) 16.0
 
April 20, 2021, 10 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 7.4 μg/m3 (31) 31.0
 
April 20, 2021, 9 a.m. 1.4 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.13 ppb (2) N/A 4.2 μg/m3 (18) 18.0
 
April 20, 2021, 8 a.m. 2.4 ppb (3) 0.1 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 6.9 μg/m3 (29) 29.0
 
April 20, 2021, 7 a.m. 1.7 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 0.5 μg/m3 (3) 3.0
 
April 20, 2021, 6 a.m. 2.1 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 3.3 μg/m3 (14) 14.0
 
April 20, 2021, 5 a.m. 2.1 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 1.3 μg/m3 (6) 6.0
 
April 20, 2021, 4 a.m. 1.9 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 4.4 μg/m3 (19) 19.0
 
April 20, 2021, 3 a.m. 1.4 ppb (2) 0.1 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A 5.1 μg/m3 (22) 22.0
 
April 20, 2021, 2 a.m. 1.5 ppb (2) 0.1 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A 3.6 μg/m3 (16) 16.0
 
April 20, 2021, 1 a.m. 1.9 ppb (2) 0.1 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.15 ppb (2) N/A 3.5 μg/m3 (15) 15.0
 
April 20, 2021, midnight 2.5 ppb (3) 0.1 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
April 19, 2021, 11 p.m. 3.4 ppb (4) 0.5 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (3) N/A 3.7 μg/m3 (16) 16.0
 
April 19, 2021, 10 p.m. 7.5 ppb (8) 2.4 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.23 ppb (3) N/A 5.7 μg/m3 (24) 24.0
 
April 19, 2021, 9 p.m. 8.7 ppb (9) 3.2 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 7.8 μg/m3 (33) 33.0
 
April 19, 2021, 8 p.m. 9.9 ppb (10) 4.1 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
April 19, 2021, 7 p.m. 9.2 ppb (9) 3.6 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 6.7 μg/m3 (28) 28.0
 
April 19, 2021, 6 p.m. 10.5 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 12.3 μg/m3 (52) 52.0
 
April 19, 2021, 5 p.m. 11.4 ppb (11) 4.6 ppb (5) N/A 7.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 10.9 μg/m3 (46) 46.0
 
April 19, 2021, 4 p.m. 13.6 ppb (13) 6.2 ppb (6) N/A 7.0 ppb (7) N/A N/A N/A 0.23 ppb (3) N/A 6.3 μg/m3 (27) 27.0
 
April 19, 2021, 3 p.m. 15.7 ppb (15) 7.8 ppb (8) N/A 8.0 ppb (8) N/A N/A N/A 0.26 ppb (4) N/A 4.6 μg/m3 (20) 20.0
 
April 19, 2021, 2 p.m. 19.5 ppb (19) 10.0 ppb (10) N/A 10.0 ppb (10) N/A N/A N/A 0.28 ppb (4) N/A 7.5 μg/m3 (32) 32.0
 
April 19, 2021, 1 p.m. 17.7 ppb (17) 8.4 ppb (8) N/A 9.0 ppb (9) N/A N/A N/A 0.3 ppb (4) N/A 6.9 μg/m3 (29) 29.0
 
April 19, 2021, noon 19.4 ppb (19) 8.5 ppb (9) N/A 11.0 ppb (11) N/A N/A N/A 0.34 ppb (4) N/A 6.5 μg/m3 (28) 28.0
 
April 19, 2021, 11 a.m. 18.4 ppb (18) 7.2 ppb (7) N/A 11.0 ppb (11) N/A N/A N/A 0.31 ppb (4) N/A 4.3 μg/m3 (18) 18.0
 
April 19, 2021, 10 a.m. 12.1 ppb (12) 3.6 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A 0.22 ppb (3) N/A 4.1 μg/m3 (18) 18.0
 
April 19, 2021, 9 a.m. 6.2 ppb (6) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.18 ppb (3) N/A 6.1 μg/m3 (26) 26.0
 
April 19, 2021, 8 a.m. 4.7 ppb (5) 0.5 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.16 ppb (3) N/A 6.3 μg/m3 (27) 27.0
 
April 19, 2021, 7 a.m. 5.2 ppb (5) 0.7 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.16 ppb (3) N/A 3.5 μg/m3 (15) 15.0
 
April 19, 2021, 6 a.m. 4.6 ppb (5) 0.5 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
April 19, 2021, 5 a.m. 6.4 ppb (7) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (3) N/A 3.8 μg/m3 (16) 16.0
 
April 19, 2021, 4 a.m. 3.9 ppb (4) 0.2 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.16 ppb (3) N/A 4.9 μg/m3 (21) 21.0
 
April 19, 2021, 3 a.m. 3.3 ppb (4) 0.2 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (3) N/A 6.6 μg/m3 (28) 28.0
 
April 19, 2021, 2 a.m. 3.9 ppb (4) 0.3 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (3) N/A 6.1 μg/m3 (26) 26.0
 
April 19, 2021, 1 a.m. 3.4 ppb (4) 0.1 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
April 19, 2021, midnight 2.4 ppb (3) 0.1 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
April 18, 2021, 11 p.m. 5.4 ppb (6) 1.1 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.21 ppb (3) N/A 5.4 μg/m3 (23) 23.0
 
April 18, 2021, 10 p.m. 5.4 ppb (6) 1.5 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.23 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
April 18, 2021, 9 p.m. 5.3 ppb (5) 1.7 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (3) N/A 6.5 μg/m3 (28) 28.0
 
April 18, 2021, 8 p.m. 4.2 ppb (4) 1.1 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.2 ppb (3) N/A 6.7 μg/m3 (28) 28.0
 
April 18, 2021, 7 p.m. 2.0 ppb (2) 0.4 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.17 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
April 18, 2021, 6 p.m. 2.6 ppb (3) 0.5 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.17 ppb (3) N/A 6.5 μg/m3 (28) 28.0
 
April 18, 2021, 5 p.m. 3.2 ppb (4) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (3) N/A 8.1 μg/m3 (34) 34.0
 
April 18, 2021, 4 p.m. 2.9 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (3) N/A 9.9 μg/m3 (42) 42.0
 
April 18, 2021, 3 p.m. 3.7 ppb (4) 1.1 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (3) N/A 5.9 μg/m3 (25) 25.0
 
April 18, 2021, 2 p.m. 6.4 ppb (7) 2.6 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (3) N/A 8.5 μg/m3 (36) 36.0
 
April 18, 2021, 1 p.m. 6.8 ppb (7) 2.5 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.21 ppb (3) N/A 8.4 μg/m3 (36) 36.0
 
April 18, 2021, noon 9.9 ppb (10) 3.8 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.26 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
April 18, 2021, 11 a.m. 7.1 ppb (7) 1.5 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.22 ppb (3) N/A 12.6 μg/m3 (53) 53.0
 
April 18, 2021, 10 a.m. 6.7 ppb (7) 1.2 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 9.9 μg/m3 (42) 42.0
 
April 18, 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 8.6 μg/m3 (36) 36.0
 
April 18, 2021, 8 a.m. 6.0 ppb (6) 0.6 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (3) N/A 9.3 μg/m3 (39) 39.0
 
April 18, 2021, 7 a.m. 6.6 ppb (7) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 7.9 μg/m3 (33) 33.0
 
April 18, 2021, 6 a.m. 4.4 ppb (5) 0.3 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (3) N/A 4.6 μg/m3 (20) 20.0
 
April 18, 2021, 5 a.m. 6.4 ppb (7) 1.3 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.25 ppb (3) N/A 9.5 μg/m3 (40) 40.0
 
April 18, 2021, 4 a.m. 7.2 ppb (7) 1.2 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 11.7 μg/m3 (49) 49.0
 
April 18, 2021, 3 a.m. 10.1 ppb (10) 2.5 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A 0.27 ppb (4) N/A 7.8 μg/m3 (33) 33.0
 
April 18, 2021, 2 a.m. 3.7 ppb (4) 0.4 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (3) N/A 10.7 μg/m3 (45) 45.0
 
April 18, 2021, 1 a.m. 7.7 ppb (8) 1.6 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 10.8 μg/m3 (46) 46.0
 
April 18, 2021, midnight 7.9 ppb (8) 1.6 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 7.3 μg/m3 (31) 31.0
 
April 17, 2021, 11 p.m. 2.9 ppb (3) 0.5 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (3) N/A 4.5 μg/m3 (19) 19.0
 
April 17, 2021, 10 p.m. 4.3 ppb (5) 1.3 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.22 ppb (3) N/A 7.5 μg/m3 (32) 32.0
 
April 17, 2021, 9 p.m. 7.1 ppb (7) 2.3 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.23 ppb (3) N/A 5.1 μg/m3 (22) 22.0
 
April 17, 2021, 8 p.m. 3.9 ppb (4) 1.1 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (3) N/A 5.1 μg/m3 (22) 22.0
 
April 17, 2021, 7 p.m. 2.1 ppb (2) 0.5 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (3) N/A 8.7 μg/m3 (37) 37.0
 
April 17, 2021, 6 p.m. 2.2 ppb (3) 0.5 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (3) N/A 8.9 μg/m3 (38) 38.0
 
April 17, 2021, 5 p.m. 2.7 ppb (3) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (3) N/A 10.4 μg/m3 (44) 44.0
 
April 17, 2021, 4 p.m. 4.3 ppb (5) 1.2 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.2 ppb (3) N/A 9.8 μg/m3 (41) 41.0
 
April 17, 2021, 3 p.m. 4.2 ppb (4) 1.5 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (3) N/A 9.5 μg/m3 (40) 40.0
 
April 17, 2021, 2 p.m. 4.3 ppb (5) 1.3 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (3) N/A 10.6 μg/m3 (45) 45.0
 
April 17, 2021, 1 p.m. 3.8 ppb (4) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (3) N/A 13.2 μg/m3 (54) 54.0
 
April 17, 2021, noon 3.7 ppb (4) 0.4 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (3) N/A 11.5 μg/m3 (48) 48.0
 
April 17, 2021, 11 a.m. 2.9 ppb (3) 0.3 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (3) N/A 10.5 μg/m3 (44) 44.0
 
April 17, 2021, 10 a.m. 2.7 ppb (3) 0.3 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (3) N/A 10.7 μg/m3 (45) 45.0
 
April 17, 2021, 9 a.m. 2.5 ppb (3) 0.3 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (3) N/A 10.7 μg/m3 (45) 45.0
 
April 17, 2021, 8 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 5.5 μg/m3 (23) 23.0
 
April 17, 2021, 7 a.m. 4.7 ppb (5) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (3) N/A 7.8 μg/m3 (33) 33.0
 
April 17, 2021, 6 a.m. 6.4 ppb (7) 1.2 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.25 ppb (3) N/A 8.3 μg/m3 (35) 35.0
 
April 17, 2021, 5 a.m. 6.6 ppb (7) 1.4 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.22 ppb (3) N/A 5.3 μg/m3 (23) 23.0
 
April 17, 2021, 4 a.m. 14.0 ppb (14) 2.0 ppb (2) N/A 12.0 ppb (12) N/A N/A N/A 0.23 ppb (3) N/A 5.4 μg/m3 (23) 23.0
 
April 17, 2021, 3 a.m. 7.4 ppb (7) 1.1 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (3) N/A 5.8 μg/m3 (25) 25.0
 
April 17, 2021, 2 a.m. 5.0 ppb (5) 0.2 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.19 ppb (3) N/A 5.3 μg/m3 (23) 23.0
 
April 17, 2021, 1 a.m. 3.4 ppb (4) 0.2 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (3) N/A 4.9 μg/m3 (21) 21.0
 
April 17, 2021, midnight 3.1 ppb (3) 0.1 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (3) N/A 5.7 μg/m3 (24) 24.0
 
April 16, 2021, 11 p.m. 3.0 ppb (3) 0.3 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (3) N/A 2.8 μg/m3 (12) 12.0
 
April 16, 2021, 10 p.m. 2.9 ppb (3) 0.3 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (3) N/A 5.7 μg/m3 (24) 24.0
 
April 16, 2021, 9 p.m. 4.1 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (3) N/A 5.2 μg/m3 (22) 22.0
 
April 16, 2021, 8 p.m. 5.5 ppb (6) 1.6 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (3) N/A 8.2 μg/m3 (35) 35.0
 
April 16, 2021, 7 p.m. 10.5 ppb (10) 5.4 ppb (6) N/A 5.0 ppb (5) N/A N/A N/A 0.28 ppb (4) N/A 8.1 μg/m3 (34) 34.0
 
April 16, 2021, 6 p.m. 14.9 ppb (15) 8.3 ppb (8) N/A 7.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A 5.1 μg/m3 (22) 22.0
 
April 16, 2021, 5 p.m. 9.6 ppb (10) 4.9 ppb (5) N/A 5.0 ppb (5) N/A N/A N/A 0.23 ppb (3) N/A 7.7 μg/m3 (33) 33.0
 
April 16, 2021, 4 p.m. 7.5 ppb (8) 3.6 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (3) N/A 5.7 μg/m3 (24) 24.0
 
April 16, 2021, 3 p.m. 8.4 ppb (8) 4.1 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (3) N/A 4.6 μg/m3 (20) 20.0
 
April 16, 2021, 2 p.m. 10.0 ppb (10) 4.3 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A 0.2 ppb (3) N/A 5.9 μg/m3 (25) 25.0
 
April 16, 2021, 1 p.m. 13.8 ppb (14) 4.3 ppb (5) N/A 10.0 ppb (10) N/A N/A N/A 0.25 ppb (3) N/A 8.6 μg/m3 (36) 36.0
 
April 16, 2021, noon 19.3 ppb (19) 8.2 ppb (8) N/A 11.0 ppb (11) N/A N/A N/A 0.29 ppb (4) N/A 5.2 μg/m3 (22) 22.0
 
April 16, 2021, 11 a.m. 17.8 ppb (17) 10.4 ppb (10) N/A 9.0 ppb (9) N/A N/A N/A 0.24 ppb (3) N/A 4.9 μg/m3 (21) 21.0
 
April 16, 2021, 10 a.m. 7.4 ppb (7) 0.3 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A 0.18 ppb (3) N/A 9.3 μg/m3 (39) 39.0
 
April 16, 2021, 9 a.m. 6.5 ppb (7) 0.2 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.17 ppb (3) N/A 2.3 μg/m3 (10) 10.0
 
April 16, 2021, 8 a.m. 5.9 ppb (6) 0.3 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.18 ppb (3) N/A 4.9 μg/m3 (21) 21.0
 
April 16, 2021, 7 a.m. 4.9 ppb (5) 0.2 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.18 ppb (3) N/A 2.7 μg/m3 (12) 12.0
 
April 16, 2021, 6 a.m. 4.5 ppb (5) 0.2 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (3) N/A 5.3 μg/m3 (23) 23.0
 
April 16, 2021, 5 a.m. 4.5 ppb (5) 0.2 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (3) N/A 3.3 μg/m3 (14) 14.0
 
April 16, 2021, 4 a.m. 7.5 ppb (8) 0.2 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A 0.22 ppb (3) N/A 5.6 μg/m3 (24) 24.0
 
April 16, 2021, 3 a.m. 9.1 ppb (9) 0.2 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A 0.25 ppb (3) N/A 6.6 μg/m3 (28) 28.0
 
April 16, 2021, 2 a.m. 7.4 ppb (7) 0.2 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A 0.22 ppb (3) N/A 1.8 μg/m3 (8) 8.0
 
April 16, 2021, 1 a.m. 4.6 ppb (5) 0.1 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.18 ppb (3) N/A 2.7 μg/m3 (12) 12.0
 
April 16, 2021, midnight 2.4 ppb (3) 0.2 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.17 ppb (3) N/A 5.5 μg/m3 (23) 23.0
 
April 15, 2021, 11 p.m. 1.6 ppb (2) 0.3 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A 1.3 μg/m3 (6) 6.0
 
April 15, 2021, 10 p.m. 1.9 ppb (2) 0.4 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A 3.1 μg/m3 (13) 13.0
 
April 15, 2021, 9 p.m. 2.5 ppb (3) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A 2.8 μg/m3 (12) 12.0
 
April 15, 2021, 8 p.m. 3.2 ppb (4) 1.5 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (3) N/A -0.7 μg/m3 (0) 4.0
 
April 15, 2021, 7 p.m. 2.9 ppb (3) 1.3 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (3) N/A 2.0 μg/m3 (9) 9.0
 
April 15, 2021, 6 p.m. 2.8 ppb (3) 1.5 ppb (2) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
April 15, 2021, 5 p.m. 3.0 ppb (3) 1.6 ppb (2) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (3) N/A 1.1 μg/m3 (5) 5.0
 
April 15, 2021, 4 p.m. 3.0 ppb (3) 1.5 ppb (2) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A 0.9 μg/m3 (4) 4.0
 
April 15, 2021, 3 p.m. 3.2 ppb (4) 1.7 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
April 15, 2021, 2 p.m. 3.5 ppb (4) 1.8 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (3) N/A 3.2 μg/m3 (14) 14.0
 
April 15, 2021, 1 p.m. 8.5 ppb (9) 5.2 ppb (5) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (3) N/A 1.6 μg/m3 (7) 9.0
 
April 15, 2021, noon 17.3 ppb (17) 12.5 ppb (12) N/A 5.0 ppb (5) N/A N/A N/A 0.19 ppb (3) N/A 3.6 μg/m3 (16) 17.0
 
April 15, 2021, 11 a.m. 6.1 ppb (6) 1.3 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.18 ppb (3) N/A 5.7 μg/m3 (24) 24.0
 
April 15, 2021, 10 a.m. 5.0 ppb (5) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (3) N/A 7.5 μg/m3 (32) 32.0