AQSQID: 295100085

Site Name: Blair Street

Location: St. Louis (Buchanan St), MO

Reporting: True, Located: True

Current AQI: 48.0

St. Louis (Buchanan St) MO, US: 38.656449, -90.198548

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 23, 2019, 7 p.m. 4.7 ppb (4) 0.8 ppb (1) 8.3 ppb (8) 4.0 ppb (4) N/A 3.0 ppb (4) 51.0 ppb (39) 0.2 ppb (2) N/A 11.5 μg/m3 (48) 48.0
 
March 23, 2019, 6 p.m. 5.7 ppb (5) 1.6 ppb (1) 9.4 ppb (9) 4.0 ppb (4) N/A 3.0 ppb (4) 50.0 ppb (38) 0.21 ppb (2) N/A 7.5 μg/m3 (31) 38.0
 
March 23, 2019, 5 p.m. 6.1 ppb (6) 1.7 ppb (2) 9.2 ppb (9) 4.0 ppb (4) N/A 1.0 ppb (1) 46.0 ppb (35) 0.2 ppb (2) N/A 5.6 μg/m3 (23) 35.0
 
March 23, 2019, 4 p.m. 7.7 ppb (7) 2.6 ppb (2) 11.0 ppb (10) 5.0 ppb (5) N/A 1.0 ppb (1) 42.0 ppb (32) 0.2 ppb (2) N/A 5.5 μg/m3 (23) 32.0
 
March 23, 2019, 3 p.m. 10.7 ppb (10) 3.4 ppb (3) 13.4 ppb (12) 7.0 ppb (6) N/A 1.0 ppb (1) 38.0 ppb (29) 0.21 ppb (2) N/A 5.3 μg/m3 (22) 29.0
 
March 23, 2019, 2 p.m. 9.7 ppb (9) 3.0 ppb (3) 13.0 ppb (12) 7.0 ppb (6) N/A 0.0 ppb (0) 36.0 ppb (28) 0.21 ppb (2) N/A 5.2 μg/m3 (22) 28.0
 
March 23, 2019, 1 p.m. 21.6 ppb (20) 6.1 ppb (6) 24.7 ppb (23) 16.0 ppb (15) N/A 0.0 ppb (0) 26.0 ppb (20) 0.23 ppb (3) N/A 7.6 μg/m3 (32) 32.0
 
March 23, 2019, noon 35.8 ppb (33) 8.1 ppb (8) 37.6 ppb (35) 28.0 ppb (26) N/A 0.0 ppb (0) 15.0 ppb (12) 0.26 ppb (3) N/A 9.1 μg/m3 (38) 38.0
 
March 23, 2019, 11 a.m. 43.3 ppb (40) 8.3 ppb (8) 46.4 ppb (43) 35.0 ppb (32) N/A 0.0 ppb (0) 8.0 ppb (6) N/A N/A 11.1 μg/m3 (46) 46.0
 
March 23, 2019, 10 a.m. 27.5 ppb (25) 1.6 ppb (1) 30.7 ppb (28) 26.0 ppb (24) N/A 0.0 ppb (0) 16.0 ppb (12) N/A N/A 7.0 μg/m3 (29) 29.0
 
March 23, 2019, 9 a.m. 28.5 ppb (26) 1.0 ppb (1) 29.2 ppb (27) 27.0 ppb (25) N/A 0.0 ppb (0) 16.0 ppb (12) 0.32 ppb (4) N/A 6.7 μg/m3 (28) 28.0
 
March 23, 2019, 8 a.m. 33.1 ppb (31) 2.1 ppb (2) 36.7 ppb (34) 31.0 ppb (29) N/A 0.0 ppb (0) 11.0 ppb (8) 0.28 ppb (3) N/A 8.8 μg/m3 (37) 37.0
 
March 23, 2019, 7 a.m. 23.1 ppb (21) 0.6 ppb (1) 24.0 ppb (22) 23.0 ppb (21) N/A 0.0 ppb (0) 22.0 ppb (17) 0.33 ppb (4) N/A 4.7 μg/m3 (20) 22.0
 
March 23, 2019, 6 a.m. 20.4 ppb (19) 0.8 ppb (1) 22.6 ppb (21) 20.0 ppb (19) N/A 0.0 ppb (0) 27.0 ppb (21) 0.3 ppb (3) N/A 9.1 μg/m3 (38) 38.0
 
March 23, 2019, 5 a.m. 17.5 ppb (16) 0.7 ppb (1) 19.3 ppb (18) 17.0 ppb (16) N/A 0.0 ppb (0) 30.0 ppb (23) 0.34 ppb (4) N/A 10.2 μg/m3 (42) 42.0
 
March 23, 2019, 4 a.m. 24.2 ppb (22) 1.4 ppb (1) 26.2 ppb (24) 23.0 ppb (21) N/A 0.0 ppb (0) 25.0 ppb (19) 0.32 ppb (4) N/A 8.9 μg/m3 (37) 37.0
 
March 23, 2019, 3 a.m. 24.3 ppb (23) 2.0 ppb (2) 26.8 ppb (25) 22.0 ppb (20) N/A 0.0 ppb (0) 26.0 ppb (20) 0.33 ppb (4) N/A 10.3 μg/m3 (43) 43.0
 
March 23, 2019, 2 a.m. 27.4 ppb (25) 2.2 ppb (2) 27.8 ppb (26) 25.0 ppb (23) N/A 1.0 ppb (1) 25.0 ppb (19) 0.34 ppb (4) N/A 9.6 μg/m3 (40) 40.0
 
March 23, 2019, 1 a.m. 26.4 ppb (24) 0.9 ppb (1) 28.6 ppb (26) 26.0 ppb (24) N/A 0.0 ppb (0) 26.0 ppb (20) 0.31 ppb (3) N/A 7.3 μg/m3 (30) 30.0
 
March 23, 2019, midnight 15.9 ppb (15) 0.4 ppb (0) 18.1 ppb (17) 16.0 ppb (15) N/A 0.0 ppb (0) 37.0 ppb (28) 0.23 ppb (3) N/A 7.5 μg/m3 (31) 31.0
 
March 22, 2019, 11 p.m. 9.1 ppb (8) 0.7 ppb (1) 11.9 ppb (11) 8.0 ppb (7) N/A 0.0 ppb (0) 46.0 ppb (35) 0.21 ppb (2) N/A 5.2 μg/m3 (22) 35.0
 
March 22, 2019, 10 p.m. 6.6 ppb (6) 1.2 ppb (1) 9.1 ppb (8) 5.0 ppb (5) N/A 0.0 ppb (0) 49.0 ppb (38) 0.2 ppb (2) N/A 4.7 μg/m3 (20) 38.0
 
March 22, 2019, 9 p.m. 6.1 ppb (6) 1.3 ppb (1) 9.1 ppb (8) 5.0 ppb (5) N/A 0.0 ppb (0) 50.0 ppb (38) 0.18 ppb (2) N/A 3.1 μg/m3 (13) 38.0
 
March 22, 2019, 8 p.m. 5.1 ppb (5) 1.9 ppb (2) 5.8 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 50.0 ppb (38) 0.23 ppb (3) N/A 2.0 μg/m3 (8) 38.0
 
March 22, 2019, 7 p.m. 3.1 ppb (3) 1.1 ppb (1) 5.0 ppb (5) 2.0 ppb (2) N/A 0.0 ppb (0) 51.0 ppb (39) 0.2 ppb (2) N/A 9.5 μg/m3 (40) 40.0
 
March 22, 2019, 6 p.m. 4.8 ppb (4) 1.4 ppb (1) 6.3 ppb (6) 3.0 ppb (3) N/A 0.0 ppb (0) 49.0 ppb (38) 0.21 ppb (2) N/A 6.9 μg/m3 (29) 38.0
 
March 22, 2019, 5 p.m. 2.6 ppb (2) 0.7 ppb (1) 4.9 ppb (5) 2.0 ppb (2) N/A 0.0 ppb (0) 47.0 ppb (36) 0.18 ppb (2) N/A 7.5 μg/m3 (31) 36.0
 
March 22, 2019, 4 p.m. 7.2 ppb (7) 6.9 ppb (6) 6.7 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 44.0 ppb (34) 0.21 ppb (2) N/A 4.6 μg/m3 (19) 34.0
 
March 22, 2019, 3 p.m. 8.4 ppb (8) 3.7 ppb (3) 11.0 ppb (10) 5.0 ppb (5) N/A 0.0 ppb (0) 40.0 ppb (31) 0.25 ppb (3) N/A 8.4 μg/m3 (35) 35.0
 
March 22, 2019, 2 p.m. 8.9 ppb (8) 3.5 ppb (3) 10.8 ppb (10) 5.0 ppb (5) N/A 0.0 ppb (0) 37.0 ppb (28) 0.22 ppb (2) N/A 10.6 μg/m3 (44) 44.0
 
March 22, 2019, 1 p.m. 16.3 ppb (15) 6.1 ppb (6) 16.0 ppb (15) 10.0 ppb (9) N/A 0.0 ppb (0) 32.0 ppb (25) 0.3 ppb (3) N/A 7.9 μg/m3 (33) 33.0
 
March 22, 2019, noon 25.4 ppb (24) 8.4 ppb (8) 22.5 ppb (21) 17.0 ppb (16) N/A 0.0 ppb (0) 27.0 ppb (21) 0.32 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
March 22, 2019, 11 a.m. 16.9 ppb (16) 6.8 ppb (6) 16.6 ppb (15) 10.0 ppb (9) N/A N/A 30.0 ppb (23) 0.31 ppb (3) N/A 5.5 μg/m3 (23) 23.0
 
March 22, 2019, 10 a.m. 7.3 ppb (7) 0.7 ppb (1) 8.5 ppb (8) 7.0 ppb (6) N/A N/A 35.0 ppb (27) 0.2 ppb (2) N/A 3.6 μg/m3 (15) 27.0
 
March 22, 2019, 9 a.m. 6.9 ppb (6) 0.1 ppb (0) 8.3 ppb (8) 7.0 ppb (6) N/A 0.0 ppb (0) 34.0 ppb (26) 0.19 ppb (2) N/A 2.8 μg/m3 (12) 26.0
 
March 22, 2019, 8 a.m. 7.0 ppb (6) 0.2 ppb (0) 8.1 ppb (8) 7.0 ppb (6) N/A 0.0 ppb (0) 35.0 ppb (27) 0.19 ppb (2) N/A 3.3 μg/m3 (14) 27.0
 
March 22, 2019, 7 a.m. 10.0 ppb (9) 0.4 ppb (0) 11.2 ppb (10) 10.0 ppb (9) N/A 0.0 ppb (0) 33.0 ppb (25) 0.2 ppb (2) N/A 6.2 μg/m3 (26) 26.0
 
March 22, 2019, 6 a.m. 10.5 ppb (10) 0.1 ppb (0) 12.5 ppb (12) 11.0 ppb (10) N/A 0.0 ppb (0) 33.0 ppb (25) 0.23 ppb (3) N/A 5.0 μg/m3 (21) 25.0
 
March 22, 2019, 5 a.m. 15.4 ppb (14) 0.6 ppb (1) 17.0 ppb (16) 15.0 ppb (14) N/A 0.0 ppb (0) 30.0 ppb (23) 0.28 ppb (3) N/A 6.1 μg/m3 (25) 25.0
 
March 22, 2019, 4 a.m. 32.9 ppb (30) 2.5 ppb (2) 31.2 ppb (29) 30.0 ppb (28) N/A 0.0 ppb (0) 15.0 ppb (12) 0.5 ppb (6) N/A 13.0 μg/m3 (52) 52.0
 
March 22, 2019, 3 a.m. 31.9 ppb (30) 1.6 ppb (1) 29.7 ppb (28) 30.0 ppb (28) N/A 0.0 ppb (0) 13.0 ppb (10) 0.51 ppb (6) N/A 9.4 μg/m3 (39) 39.0
 
March 22, 2019, 2 a.m. 25.0 ppb (23) 0.9 ppb (1) 25.5 ppb (24) 24.0 ppb (22) N/A 0.0 ppb (0) 20.0 ppb (15) 0.46 ppb (5) N/A 9.7 μg/m3 (40) 40.0
 
March 22, 2019, 1 a.m. 16.4 ppb (15) 0.2 ppb (0) 17.6 ppb (16) 16.0 ppb (15) N/A 0.0 ppb (0) 30.0 ppb (23) 0.35 ppb (4) N/A 6.9 μg/m3 (29) 29.0
 
March 22, 2019, midnight 6.6 ppb (6) 0.2 ppb (0) 8.0 ppb (7) 7.0 ppb (6) N/A 0.0 ppb (0) 41.0 ppb (32) 0.23 ppb (3) N/A 1.4 μg/m3 (6) 32.0
 
March 21, 2019, 11 p.m. 2.2 ppb (2) 0.2 ppb (0) 3.7 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 48.0 ppb (37) 0.18 ppb (2) N/A 5.6 μg/m3 (23) 37.0
 
March 21, 2019, 10 p.m. 1.7 ppb (2) 0.2 ppb (0) 3.6 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (38) 0.18 ppb (2) N/A 2.0 μg/m3 (8) 38.0
 
March 21, 2019, 9 p.m. 2.4 ppb (2) 0.2 ppb (0) 3.7 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (38) 0.18 ppb (2) N/A 4.6 μg/m3 (19) 38.0
 
March 21, 2019, 8 p.m. 4.4 ppb (4) 2.4 ppb (2) 6.2 ppb (6) 2.0 ppb (2) N/A 0.0 ppb (0) 48.0 ppb (37) 0.21 ppb (2) N/A 5.2 μg/m3 (22) 37.0
 
March 21, 2019, 7 p.m. 7.6 ppb (7) 3.4 ppb (3) 8.8 ppb (8) 4.0 ppb (4) N/A 0.0 ppb (0) 47.0 ppb (36) 0.21 ppb (2) N/A 6.3 μg/m3 (26) 36.0
 
March 21, 2019, 6 p.m. 3.5 ppb (3) 1.2 ppb (1) 5.3 ppb (5) 2.0 ppb (2) N/A 0.0 ppb (0) 47.0 ppb (36) 0.22 ppb (2) N/A 7.8 μg/m3 (32) 36.0
 
March 21, 2019, 5 p.m. 3.6 ppb (3) 1.1 ppb (1) 4.6 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 47.0 ppb (36) 0.2 ppb (2) N/A 5.1 μg/m3 (21) 36.0
 
March 21, 2019, 4 p.m. 5.4 ppb (5) 2.4 ppb (2) 7.7 ppb (7) 3.0 ppb (3) N/A 0.0 ppb (0) 45.0 ppb (35) 0.23 ppb (3) N/A 7.0 μg/m3 (29) 35.0
 
March 21, 2019, 3 p.m. 4.6 ppb (4) 1.9 ppb (2) 7.2 ppb (7) 3.0 ppb (3) N/A 0.0 ppb (0) 46.0 ppb (35) 0.23 ppb (3) N/A 9.6 μg/m3 (40) 40.0
 
March 21, 2019, 2 p.m. 5.0 ppb (5) 1.8 ppb (2) 7.9 ppb (7) 3.0 ppb (3) N/A 0.0 ppb (0) 44.0 ppb (34) 0.2 ppb (2) N/A 10.6 μg/m3 (44) 44.0
 
March 21, 2019, 1 p.m. 7.1 ppb (7) 1.9 ppb (2) 9.8 ppb (9) 5.0 ppb (5) N/A 0.0 ppb (0) 41.0 ppb (32) 0.23 ppb (3) N/A 6.5 μg/m3 (27) 32.0
 
March 21, 2019, noon 7.7 ppb (7) 1.6 ppb (1) 9.1 ppb (8) 6.0 ppb (6) N/A 0.0 ppb (0) 39.0 ppb (30) 0.23 ppb (3) N/A 10.8 μg/m3 (45) 45.0
 
March 21, 2019, 11 a.m. 7.3 ppb (7) 0.8 ppb (1) 8.7 ppb (8) 7.0 ppb (6) N/A 0.0 ppb (0) 39.0 ppb (30) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 10 a.m. 3.5 ppb (3) 0.1 ppb (0) 5.6 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 42.0 ppb (32) N/A N/A 4.3 μg/m3 (18) 32.0
 
March 21, 2019, 9 a.m. 1.9 ppb (2) 0.1 ppb (0) 3.8 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 40.0 ppb (31) 0.16 ppb (2) N/A 4.3 μg/m3 (18) 31.0
 
March 21, 2019, 8 a.m. 5.6 ppb (5) 0.4 ppb (0) 7.4 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 35.0 ppb (27) 0.19 ppb (2) N/A 7.9 μg/m3 (33) 33.0
 
March 21, 2019, 7 a.m. 7.9 ppb (7) 0.5 ppb (0) 9.6 ppb (9) 7.0 ppb (6) N/A 0.0 ppb (0) 33.0 ppb (25) 0.22 ppb (2) N/A 10.1 μg/m3 (42) 42.0
 
March 21, 2019, 6 a.m. 8.6 ppb (8) 0.1 ppb (0) 10.8 ppb (10) 9.0 ppb (8) N/A 1.0 ppb (1) 34.0 ppb (26) 0.23 ppb (3) N/A 8.5 μg/m3 (35) 35.0
 
March 21, 2019, 5 a.m. 8.4 ppb (8) 0.2 ppb (0) 10.7 ppb (10) 8.0 ppb (7) N/A 1.0 ppb (1) 35.0 ppb (27) 0.24 ppb (3) N/A 10.6 μg/m3 (44) 44.0
 
March 21, 2019, 4 a.m. 9.1 ppb (8) 0.1 ppb (0) 11.6 ppb (11) 9.0 ppb (8) N/A 0.0 ppb (0) 35.0 ppb (27) 0.28 ppb (3) N/A 7.7 μg/m3 (32) 32.0
 
March 21, 2019, 3 a.m. 11.1 ppb (10) 0.2 ppb (0) 13.4 ppb (12) 11.0 ppb (10) N/A 0.0 ppb (0) 33.0 ppb (25) 0.34 ppb (4) N/A 9.9 μg/m3 (41) 41.0
 
March 21, 2019, 2 a.m. 12.1 ppb (11) 0.2 ppb (0) 13.2 ppb (12) 12.0 ppb (11) N/A 1.0 ppb (1) 32.0 ppb (25) 0.48 ppb (5) N/A 9.8 μg/m3 (41) 41.0
 
March 21, 2019, 1 a.m. 13.1 ppb (12) 0.7 ppb (1) 13.9 ppb (13) 13.0 ppb (12) N/A 1.0 ppb (1) 33.0 ppb (25) 0.29 ppb (3) N/A 9.2 μg/m3 (38) 38.0
 
March 21, 2019, midnight 6.4 ppb (6) 0.3 ppb (0) 8.2 ppb (8) 6.0 ppb (6) N/A 0.0 ppb (0) 41.0 ppb (32) 0.25 ppb (3) N/A 3.9 μg/m3 (16) 32.0
 
March 20, 2019, 11 p.m. 3.6 ppb (3) 0.1 ppb (0) 5.6 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 45.0 ppb (35) 0.23 ppb (3) N/A 8.0 μg/m3 (33) 35.0
 
March 20, 2019, 10 p.m. 4.1 ppb (4) 0.2 ppb (0) 6.0 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 43.0 ppb (33) 0.22 ppb (2) N/A 10.1 μg/m3 (42) 42.0
 
March 20, 2019, 9 p.m. 3.4 ppb (3) 0.2 ppb (0) 5.4 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 44.0 ppb (34) 0.22 ppb (2) N/A 12.2 μg/m3 (50) 50.0
 
March 20, 2019, 8 p.m. 5.6 ppb (5) 1.5 ppb (1) 6.5 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 45.0 ppb (35) 0.24 ppb (3) N/A 10.1 μg/m3 (42) 42.0
 
March 20, 2019, 7 p.m. 3.7 ppb (3) 0.8 ppb (1) 6.3 ppb (6) 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) 0.25 ppb (3) N/A 11.9 μg/m3 (50) 50.0
 
March 20, 2019, 6 p.m. 5.9 ppb (5) 1.3 ppb (1) 8.2 ppb (8) 5.0 ppb (5) N/A 3.0 ppb (4) 43.0 ppb (33) 0.28 ppb (3) N/A 18.9 μg/m3 (65) 65.0
 
March 20, 2019, 5 p.m. 7.7 ppb (7) 2.9 ppb (3) 6.9 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 46.0 ppb (35) 0.24 ppb (3) N/A 19.4 μg/m3 (66) 66.0
 
March 20, 2019, 4 p.m. 6.3 ppb (6) 1.6 ppb (1) 7.9 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 48.0 ppb (37) 0.27 ppb (3) N/A 17.3 μg/m3 (61) 61.0
 
March 20, 2019, 3 p.m. 11.0 ppb (10) 1.8 ppb (2) 13.3 ppb (12) 9.0 ppb (8) N/A 1.0 ppb (1) 43.0 ppb (33) 0.25 ppb (3) N/A 10.7 μg/m3 (45) 45.0
 
March 20, 2019, 2 p.m. 15.6 ppb (14) 2.9 ppb (3) 18.5 ppb (17) 13.0 ppb (12) N/A 1.0 ppb (1) 38.0 ppb (29) 0.25 ppb (3) N/A 11.3 μg/m3 (47) 47.0
 
March 20, 2019, 1 p.m. 20.5 ppb (19) 2.5 ppb (2) 23.5 ppb (22) 18.0 ppb (17) N/A 1.0 ppb (1) 32.0 ppb (25) 0.25 ppb (3) N/A 6.7 μg/m3 (28) 28.0
 
March 20, 2019, noon 20.1 ppb (19) 2.0 ppb (2) 21.5 ppb (20) 18.0 ppb (17) N/A 2.0 ppb (3) 31.0 ppb (24) 0.25 ppb (3) N/A 11.4 μg/m3 (48) 48.0
 
March 20, 2019, 11 a.m. 14.9 ppb (14) 0.6 ppb (1) 17.4 ppb (16) 14.0 ppb (13) N/A N/A 35.0 ppb (27) 0.23 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 20, 2019, 10 a.m. 9.1 ppb (8) 0.1 ppb (0) 11.4 ppb (11) 9.0 ppb (8) N/A N/A 41.0 ppb (32) 0.2 ppb (2) N/A 11.4 μg/m3 (48) 48.0
 
March 20, 2019, 9 a.m. 5.8 ppb (5) 0.1 ppb (0) 8.1 ppb (8) 6.0 ppb (6) N/A 1.0 ppb (1) 45.0 ppb (35) 0.19 ppb (2) N/A 13.1 μg/m3 (52) 52.0
 
March 20, 2019, 8 a.m. 7.2 ppb (7) 0.1 ppb (0) 9.6 ppb (9) 7.0 ppb (6) N/A 3.0 ppb (4) 44.0 ppb (34) 0.19 ppb (2) N/A 13.5 μg/m3 (53) 53.0
 
March 20, 2019, 7 a.m. 4.7 ppb (4) 0.1 ppb (0) 7.0 ppb (6) 5.0 ppb (5) N/A 3.0 ppb (4) 46.0 ppb (35) 0.19 ppb (2) N/A 8.4 μg/m3 (35) 35.0
 
March 20, 2019, 6 a.m. 9.3 ppb (9) 0.1 ppb (0) 11.8 ppb (11) 9.0 ppb (8) N/A 2.0 ppb (3) 43.0 ppb (33) 0.19 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 20, 2019, 5 a.m. 9.2 ppb (9) 0.1 ppb (0) 11.9 ppb (11) 9.0 ppb (8) N/A 1.0 ppb (1) 42.0 ppb (32) 0.2 ppb (2) N/A 10.4 μg/m3 (43) 43.0
 
March 20, 2019, 4 a.m. 10.1 ppb (9) 0.2 ppb (0) 12.5 ppb (12) 10.0 ppb (9) N/A 1.0 ppb (1) 42.0 ppb (32) 0.21 ppb (2) N/A 7.4 μg/m3 (31) 32.0
 
March 20, 2019, 3 a.m. 7.4 ppb (7) 0.2 ppb (0) 9.8 ppb (9) 7.0 ppb (6) N/A 2.0 ppb (3) 45.0 ppb (35) 0.23 ppb (3) N/A 6.7 μg/m3 (28) 35.0
 
March 20, 2019, 2 a.m. 13.0 ppb (12) 0.3 ppb (0) 15.9 ppb (15) 13.0 ppb (12) N/A 1.0 ppb (1) 42.0 ppb (32) 0.23 ppb (3) N/A 9.8 μg/m3 (41) 41.0
 
March 20, 2019, 1 a.m. 20.6 ppb (19) 0.6 ppb (1) 23.0 ppb (21) 20.0 ppb (19) N/A 1.0 ppb (1) 34.0 ppb (26) 0.31 ppb (3) N/A 14.6 μg/m3 (56) 56.0
 
March 20, 2019, midnight 22.5 ppb (21) 0.7 ppb (1) 26.4 ppb (24) 22.0 ppb (20) N/A 1.0 ppb (1) 33.0 ppb (25) 0.29 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 11 p.m. 16.4 ppb (15) 1.8 ppb (2) 19.6 ppb (18) 15.0 ppb (14) N/A 1.0 ppb (1) 41.0 ppb (32) 0.23 ppb (3) N/A 7.1 μg/m3 (30) 32.0
 
March 19, 2019, 10 p.m. 10.3 ppb (10) 1.2 ppb (1) 12.9 ppb (12) 9.0 ppb (8) N/A 1.0 ppb (1) 46.0 ppb (35) 0.23 ppb (3) N/A 6.3 μg/m3 (26) 35.0
 
March 19, 2019, 9 p.m. 18.2 ppb (17) 3.6 ppb (3) 18.9 ppb (18) 15.0 ppb (14) N/A 2.0 ppb (3) 44.0 ppb (34) 0.24 ppb (3) N/A 12.1 μg/m3 (50) 50.0
 
March 19, 2019, 8 p.m. 10.2 ppb (9) 2.1 ppb (2) 14.0 ppb (13) 8.0 ppb (7) N/A 2.0 ppb (3) 46.0 ppb (35) 0.21 ppb (2) N/A 7.3 μg/m3 (30) 35.0
 
March 19, 2019, 7 p.m. 9.4 ppb (9) 2.1 ppb (2) 11.3 ppb (10) 7.0 ppb (6) N/A 2.0 ppb (3) 46.0 ppb (35) 0.21 ppb (2) N/A 5.2 μg/m3 (22) 35.0
 
March 19, 2019, 6 p.m. 7.3 ppb (7) 1.7 ppb (2) 9.8 ppb (9) 6.0 ppb (6) N/A 2.0 ppb (3) 47.0 ppb (36) 0.2 ppb (2) N/A 7.5 μg/m3 (31) 36.0
 
March 19, 2019, 5 p.m. 6.2 ppb (6) 2.0 ppb (2) 9.5 ppb (9) 4.0 ppb (4) N/A 1.0 ppb (1) 47.0 ppb (36) 0.2 ppb (2) N/A 7.0 μg/m3 (29) 36.0
 
March 19, 2019, 4 p.m. 8.8 ppb (8) 2.5 ppb (2) 10.9 ppb (10) 6.0 ppb (6) N/A 1.0 ppb (1) 44.0 ppb (34) 0.2 ppb (2) N/A 0.0 μg/m3 (0) 34.0
 
March 19, 2019, 3 p.m. 12.8 ppb (12) 3.6 ppb (3) 16.3 ppb (15) 9.0 ppb (8) N/A 1.0 ppb (1) 38.0 ppb (29) 0.23 ppb (3) N/A N/A 29.0
 
March 19, 2019, 2 p.m. 24.4 ppb (23) 7.4 ppb (7) 29.4 ppb (27) 17.0 ppb (16) N/A 1.0 ppb (1) 31.0 ppb (24) 0.24 ppb (3) N/A 10.4 μg/m3 (43) 43.0
 
March 19, 2019, 1 p.m. 49.0 ppb (45) 14.7 ppb (14) 52.8 ppb (49) 34.0 ppb (31) N/A 1.0 ppb (1) 17.0 ppb (13) 0.32 ppb (4) N/A 10.4 μg/m3 (43) 49.0
 
March 19, 2019, noon 68.4 ppb (65) 26.9 ppb (25) 73.3 ppb (71) 41.0 ppb (38) N/A 1.0 ppb (1) 9.0 ppb (7) 0.42 ppb (5) N/A 15.9 μg/m3 (58) 71.0
 
March 19, 2019, 11 a.m. 54.5 ppb (51) 15.4 ppb (14) 59.0 ppb (55) 39.0 ppb (36) N/A 1.0 ppb (1) 10.0 ppb (8) N/A N/A 10.7 μg/m3 (45) 55.0
 
March 19, 2019, 10 a.m. 32.1 ppb (30) 1.3 ppb (1) 35.4 ppb (33) 31.0 ppb (29) N/A 1.0 ppb (1) 17.0 ppb (13) N/A N/A 9.8 μg/m3 (41) 41.0
 
March 19, 2019, 9 a.m. 24.4 ppb (23) 0.3 ppb (0) 26.9 ppb (25) 24.0 ppb (22) N/A 1.0 ppb (1) 23.0 ppb (18) 0.23 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 8 a.m. 27.9 ppb (26) 0.2 ppb (0) 30.8 ppb (29) 28.0 ppb (26) N/A 0.0 ppb (0) 19.0 ppb (15) 0.24 ppb (3) N/A 7.6 μg/m3 (32) 32.0
 
March 19, 2019, 7 a.m. 36.4 ppb (34) 2.0 ppb (2) 37.6 ppb (35) 34.0 ppb (31) N/A 0.0 ppb (0) 13.0 ppb (10) 0.27 ppb (3) N/A 7.9 μg/m3 (33) 35.0
 
March 19, 2019, 6 a.m. 39.2 ppb (36) 4.9 ppb (5) 41.5 ppb (38) 34.0 ppb (31) N/A 0.0 ppb (0) 14.0 ppb (11) 0.31 ppb (3) N/A 5.7 μg/m3 (24) 38.0
 
March 19, 2019, 5 a.m. 32.6 ppb (30) 3.6 ppb (3) 32.7 ppb (30) 29.0 ppb (27) N/A 0.0 ppb (0) 18.0 ppb (14) 0.32 ppb (4) N/A 8.7 μg/m3 (36) 36.0
 
March 19, 2019, 4 a.m. 34.8 ppb (32) 3.9 ppb (4) 38.6 ppb (36) 31.0 ppb (29) N/A 0.0 ppb (0) 17.0 ppb (13) 0.33 ppb (4) N/A 11.7 μg/m3 (49) 49.0
 
March 19, 2019, 3 a.m. 43.1 ppb (40) 3.4 ppb (3) 46.6 ppb (43) 40.0 ppb (37) N/A 1.0 ppb (1) 10.0 ppb (8) 0.36 ppb (4) N/A 14.9 μg/m3 (56) 56.0
 
March 19, 2019, 2 a.m. 34.5 ppb (32) 3.2 ppb (3) 36.4 ppb (34) 31.0 ppb (29) N/A 0.0 ppb (0) 17.0 ppb (13) 0.32 ppb (4) N/A 7.2 μg/m3 (30) 34.0
 
March 19, 2019, 1 a.m. 29.0 ppb (27) 2.5 ppb (2) 30.5 ppb (28) 27.0 ppb (25) N/A 0.0 ppb (0) 25.0 ppb (19) 0.29 ppb (3) N/A 7.5 μg/m3 (31) 31.0
 
March 19, 2019, midnight 16.1 ppb (15) 0.9 ppb (1) 18.5 ppb (17) 15.0 ppb (14) N/A 1.0 ppb (1) 36.0 ppb (28) 0.24 ppb (3) N/A 6.0 μg/m3 (25) 28.0
 
March 18, 2019, 11 p.m. 6.5 ppb (6) 0.6 ppb (1) 8.5 ppb (8) 6.0 ppb (6) N/A 1.0 ppb (1) 46.0 ppb (35) 0.19 ppb (2) N/A 6.4 μg/m3 (27) 35.0
 
March 18, 2019, 10 p.m. 4.6 ppb (4) 0.8 ppb (1) 6.4 ppb (6) 4.0 ppb (4) N/A 1.0 ppb (1) 49.0 ppb (38) 0.18 ppb (2) N/A 2.3 μg/m3 (10) 38.0
 
March 18, 2019, 9 p.m. 6.3 ppb (6) 1.7 ppb (2) 8.1 ppb (8) 5.0 ppb (5) N/A 0.0 ppb (0) 48.0 ppb (37) 0.18 ppb (2) N/A 4.7 μg/m3 (20) 37.0
 
March 18, 2019, 8 p.m. 9.0 ppb (8) 3.5 ppb (3) 10.6 ppb (10) 5.0 ppb (5) N/A 0.0 ppb (0) 47.0 ppb (36) 0.2 ppb (2) N/A 6.6 μg/m3 (28) 36.0
 
March 18, 2019, 7 p.m. 7.2 ppb (7) 2.6 ppb (2) 9.1 ppb (8) 5.0 ppb (5) N/A 1.0 ppb (1) 47.0 ppb (36) 0.19 ppb (2) N/A 4.6 μg/m3 (19) 36.0
 
March 18, 2019, 6 p.m. 8.3 ppb (8) 3.1 ppb (3) 9.3 ppb (9) 5.0 ppb (5) N/A 0.0 ppb (0) 45.0 ppb (35) 0.2 ppb (2) N/A 6.8 μg/m3 (28) 35.0
 
March 18, 2019, 5 p.m. 13.0 ppb (12) 4.6 ppb (4) 16.1 ppb (15) 8.0 ppb (7) N/A 1.0 ppb (1) 40.0 ppb (31) 0.21 ppb (2) N/A 13.5 μg/m3 (53) 53.0
 
March 18, 2019, 4 p.m. 12.9 ppb (12) 4.7 ppb (4) 17.8 ppb (16) 8.0 ppb (7) N/A 1.0 ppb (1) 38.0 ppb (29) 0.21 ppb (2) N/A 10.9 μg/m3 (45) 45.0
 
March 18, 2019, 3 p.m. 13.7 ppb (13) 5.8 ppb (5) 16.7 ppb (15) 8.0 ppb (7) N/A 1.0 ppb (1) 36.0 ppb (28) 0.24 ppb (3) N/A 11.1 μg/m3 (46) 46.0
 
March 18, 2019, 2 p.m. 17.0 ppb (16) 6.1 ppb (6) 22.1 ppb (20) 11.0 ppb (10) N/A 1.0 ppb (1) 30.0 ppb (23) 0.21 ppb (2) N/A 10.1 μg/m3 (42) 42.0
 
March 18, 2019, 1 p.m. 31.1 ppb (29) 10.6 ppb (10) 33.3 ppb (31) 20.0 ppb (19) N/A 1.0 ppb (1) 22.0 ppb (17) 0.29 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
March 18, 2019, noon 78.6 ppb (76) 40.1 ppb (37) 93.8 ppb (92) 38.0 ppb (35) N/A 0.0 ppb (0) 7.0 ppb (5) 0.93 ppb (10) N/A 16.2 μg/m3 (59) 92.0
 
March 18, 2019, 11 a.m. 71.4 ppb (69) 32.4 ppb (30) 82.4 ppb (80) 39.0 ppb (36) N/A N/A 3.0 ppb (2) 0.65 ppb (7) N/A 10.9 μg/m3 (45) 80.0
 
March 18, 2019, 10 a.m. 63.4 ppb (60) 24.2 ppb (22) 76.8 ppb (74) 39.0 ppb (36) N/A N/A 2.0 ppb (2) 0.52 ppb (6) N/A 10.2 μg/m3 (42) 74.0
 
March 18, 2019, 9 a.m. 49.5 ppb (46) 11.7 ppb (11) 59.2 ppb (56) 38.0 ppb (35) N/A 0.0 ppb (0) 2.0 ppb (2) 0.48 ppb (5) N/A 10.8 μg/m3 (45) 56.0
 
March 18, 2019, 8 a.m. 48.2 ppb (45) 12.3 ppb (11) 58.0 ppb (54) 36.0 ppb (33) N/A 0.0 ppb (0) 2.0 ppb (2) 0.57 ppb (6) N/A 7.9 μg/m3 (33) 54.0
 
March 18, 2019, 7 a.m. 49.9 ppb (46) 14.5 ppb (13) 55.8 ppb (52) 35.0 ppb (32) N/A 0.0 ppb (0) 2.0 ppb (2) 0.62 ppb (7) N/A 7.4 μg/m3 (31) 52.0
 
March 18, 2019, 6 a.m. 49.5 ppb (46) 13.2 ppb (12) 56.2 ppb (52) 36.0 ppb (33) N/A 0.0 ppb (0) 2.0 ppb (2) 0.55 ppb (6) N/A 12.5 μg/m3 (51) 52.0
 
March 18, 2019, 5 a.m. 39.3 ppb (36) 5.4 ppb (5) 41.8 ppb (39) 34.0 ppb (31) N/A 0.0 ppb (0) 6.0 ppb (5) 0.47 ppb (5) N/A 6.3 μg/m3 (26) 39.0
 
March 18, 2019, 4 a.m. 26.0 ppb (24) 0.8 ppb (1) 30.6 ppb (28) 25.0 ppb (23) N/A 0.0 ppb (0) 15.0 ppb (12) 0.4 ppb (4) N/A 8.5 μg/m3 (35) 35.0
 
March 18, 2019, 3 a.m. 14.3 ppb (13) 0.2 ppb (0) 15.3 ppb (14) 14.0 ppb (13) N/A 0.0 ppb (0) 30.0 ppb (23) 0.29 ppb (3) N/A 5.9 μg/m3 (25) 25.0
 
March 18, 2019, 2 a.m. 13.2 ppb (12) 0.5 ppb (0) 14.0 ppb (13) 13.0 ppb (12) N/A 0.0 ppb (0) 32.0 ppb (25) 0.29 ppb (3) N/A 3.0 μg/m3 (12) 25.0
 
March 18, 2019, 1 a.m. 15.2 ppb (14) 0.1 ppb (0) 16.7 ppb (15) 15.0 ppb (14) N/A 1.0 ppb (1) 31.0 ppb (24) 0.23 ppb (3) N/A 7.3 μg/m3 (30) 30.0
 
March 18, 2019, midnight 5.5 ppb (5) 0.5 ppb (0) 7.2 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 43.0 ppb (33) 0.19 ppb (2) N/A 4.9 μg/m3 (20) 33.0
 
March 17, 2019, 11 p.m. 1.9 ppb (2) 0.1 ppb (0) 3.5 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 48.0 ppb (37) 0.17 ppb (2) N/A 6.4 μg/m3 (27) 37.0
 
March 17, 2019, 10 p.m. 1.5 ppb (1) 0.2 ppb (0) 3.4 ppb (3) 1.0 ppb (1) N/A 0.0 ppb (0) 48.0 ppb (37) 0.17 ppb (2) N/A 7.7 μg/m3 (32) 37.0
 
March 17, 2019, 9 p.m. 1.1 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 49.0 ppb (38) 0.16 ppb (2) N/A 5.7 μg/m3 (24) 38.0
 
March 17, 2019, 8 p.m. 1.6 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 48.0 ppb (37) 0.17 ppb (2) N/A 4.8 μg/m3 (20) 37.0
 
March 17, 2019, 7 p.m. 1.1 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 46.0 ppb (35) 0.17 ppb (2) N/A 3.4 μg/m3 (14) 35.0
 
March 17, 2019, 6 p.m. 2.1 ppb (2) 0.4 ppb (0) 3.7 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 46.0 ppb (35) 0.17 ppb (2) N/A 4.3 μg/m3 (18) 35.0
 
March 17, 2019, 5 p.m. 2.4 ppb (2) 0.7 ppb (1) 4.6 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (34) 0.17 ppb (2) N/A 1.5 μg/m3 (6) 34.0
 
March 17, 2019, 4 p.m. 1.5 ppb (1) 0.4 ppb (0) 3.9 ppb (4) 1.0 ppb (1) N/A 0.0 ppb (0) 41.0 ppb (32) 0.17 ppb (2) N/A 6.9 μg/m3 (29) 32.0
 
March 17, 2019, 3 p.m. 1.5 ppb (1) 0.3 ppb (0) 3.7 ppb (3) 1.0 ppb (1) N/A 0.0 ppb (0) 38.0 ppb (29) 0.17 ppb (2) N/A 4.7 μg/m3 (20) 29.0
 
March 17, 2019, 2 p.m. 2.2 ppb (2) 0.4 ppb (0) 4.4 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 37.0 ppb (28) 0.17 ppb (2) N/A 4.3 μg/m3 (18) 28.0
 
March 17, 2019, 1 p.m. 3.5 ppb (3) 0.4 ppb (0) 5.3 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 38.0 ppb (29) 0.17 ppb (2) N/A 3.3 μg/m3 (14) 29.0
 
March 17, 2019, noon 5.2 ppb (5) 0.2 ppb (0) 6.7 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 36.0 ppb (28) 0.19 ppb (2) N/A 3.7 μg/m3 (15) 28.0
 
March 17, 2019, 11 a.m. 5.9 ppb (5) 0.2 ppb (0) 7.2 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 35.0 ppb (27) N/A N/A 4.3 μg/m3 (18) 27.0
 
March 17, 2019, 10 a.m. 9.0 ppb (8) 0.2 ppb (0) 9.9 ppb (9) 9.0 ppb (8) N/A 1.0 ppb (1) 33.0 ppb (25) N/A N/A 4.5 μg/m3 (19) 25.0
 
March 17, 2019, 9 a.m. 7.1 ppb (7) 0.1 ppb (0) 8.4 ppb (8) 7.0 ppb (6) N/A 0.0 ppb (0) 33.0 ppb (25) 0.2 ppb (2) N/A 4.6 μg/m3 (19) 25.0
 
March 17, 2019, 8 a.m. 11.9 ppb (11) 0.3 ppb (0) 13.9 ppb (13) 12.0 ppb (11) N/A 1.0 ppb (1) 30.0 ppb (23) 0.21 ppb (2) N/A 3.7 μg/m3 (15) 23.0
 
March 17, 2019, 7 a.m. 11.5 ppb (11) 0.1 ppb (0) 13.6 ppb (13) 12.0 ppb (11) N/A 1.0 ppb (1) 32.0 ppb (25) 0.19 ppb (2) N/A 7.5 μg/m3 (31) 31.0
 
March 17, 2019, 6 a.m. 9.7 ppb (9) 0.3 ppb (0) 11.2 ppb (10) 9.0 ppb (8) N/A 1.0 ppb (1) 36.0 ppb (28) 0.19 ppb (2) N/A 6.1 μg/m3 (25) 28.0
 
March 17, 2019, 5 a.m. 15.0 ppb (14) 0.2 ppb (0) 16.4 ppb (15) 15.0 ppb (14) N/A 0.0 ppb (0) 31.0 ppb (24) 0.2 ppb (2) N/A 5.4 μg/m3 (23) 24.0
 
March 17, 2019, 4 a.m. 7.3 ppb (7) 0.1 ppb (0) 8.9 ppb (8) 7.0 ppb (6) N/A 1.0 ppb (1) 38.0 ppb (29) 0.2 ppb (2) N/A 5.4 μg/m3 (23) 29.0
 
March 17, 2019, 3 a.m. 23.2 ppb (21) 0.3 ppb (0) 25.4 ppb (24) 23.0 ppb (21) N/A 1.0 ppb (1) 28.0 ppb (22) 0.24 ppb (3) N/A 9.1 μg/m3 (38) 38.0
 
March 17, 2019, 2 a.m. 26.5 ppb (25) 0.8 ppb (1) 27.6 ppb (26) 26.0 ppb (24) N/A 1.0 ppb (1) 23.0 ppb (18) 0.35 ppb (4) N/A 8.6 μg/m3 (36) 36.0
 
March 17, 2019, 1 a.m. 34.5 ppb (32) 2.1 ppb (2) 38.1 ppb (35) 32.0 ppb (30) N/A 0.0 ppb (0) 13.0 ppb (10) 0.36 ppb (4) N/A 6.2 μg/m3 (26) 35.0
 
March 17, 2019, midnight 8.4 ppb (8) 0.2 ppb (0) 11.0 ppb (10) 8.0 ppb (7) N/A 0.0 ppb (0) 37.0 ppb (28) 0.22 ppb (2) N/A 6.0 μg/m3 (25) 28.0
 
March 16, 2019, 11 p.m. 3.5 ppb (3) 0.1 ppb (0) 4.6 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 45.0 ppb (35) 0.19 ppb (2) N/A 2.7 μg/m3 (11) 35.0
 
March 16, 2019, 10 p.m. 1.9 ppb (2) 0.2 ppb (0) 3.3 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.16 ppb (2) N/A 1.5 μg/m3 (6) 6.0
 
March 16, 2019, 9 p.m. 1.8 ppb (2) 0.5 ppb (0) 3.0 ppb (3) 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.17 ppb (2) N/A 2.7 μg/m3 (11) 11.0
 
March 16, 2019, 8 p.m. 1.4 ppb (1) 0.3 ppb (0) 2.6 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.15 ppb (2) N/A 4.7 μg/m3 (20) 20.0