AQSQID: 295100085

Site Name: Blair Street

Location: St. Louis (Buchanan St), MO

Reporting: True, Located: True

Current AQI: 37.0

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
May 25, 2019, 8 p.m. 0.7 ppb (1) 0.2 ppb (0) 2.7 ppb (3) 1.0 ppb (1) N/A 0.0 ppb (0) 47.0 ppb (36) 0.16 ppb (2) N/A -0.2 μg/m3 (0) 36.0
 
May 25, 2019, 7 p.m. 0.8 ppb (1) 0.2 ppb (0) 2.7 ppb (3) 1.0 ppb (1) N/A 0.0 ppb (0) 47.0 ppb (36) 0.16 ppb (2) N/A 8.8 μg/m3 (37) 37.0
 
May 25, 2019, 6 p.m. 0.8 ppb (1) 0.2 ppb (0) 2.8 ppb (3) 1.0 ppb (1) N/A 0.0 ppb (0) 46.0 ppb (35) 0.17 ppb (2) N/A 5.7 μg/m3 (24) 35.0
 
May 25, 2019, 5 p.m. 3.9 ppb (4) 0.8 ppb (1) 6.4 ppb (6) 3.0 ppb (3) N/A 0.0 ppb (0) 45.0 ppb (35) 0.21 ppb (2) N/A 4.0 μg/m3 (17) 35.0
 
May 25, 2019, 4 p.m. 2.1 ppb (2) 0.2 ppb (0) 3.9 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 42.0 ppb (32) 0.19 ppb (2) N/A 2.5 μg/m3 (10) 32.0
 
May 25, 2019, 3 p.m. 2.5 ppb (2) 0.3 ppb (0) 4.4 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 39.0 ppb (30) 0.19 ppb (2) N/A 8.1 μg/m3 (34) 34.0
 
May 25, 2019, 2 p.m. 3.5 ppb (3) 0.4 ppb (0) 5.1 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 32.0 ppb (25) 0.2 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
May 25, 2019, 1 p.m. 3.6 ppb (3) 0.3 ppb (0) 5.0 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 29.0 ppb (22) 0.21 ppb (2) N/A 6.4 μg/m3 (27) 27.0
 
May 25, 2019, noon 5.2 ppb (5) 0.3 ppb (0) 6.4 ppb (6) 5.0 ppb (5) N/A 1.0 ppb (1) 29.0 ppb (22) 0.18 ppb (2) N/A 13.7 μg/m3 (54) 54.0
 
May 25, 2019, 11 a.m. 6.0 ppb (6) 0.2 ppb (0) 7.2 ppb (7) 6.0 ppb (6) N/A N/A 30.0 ppb (23) 0.18 ppb (2) N/A 8.8 μg/m3 (37) 37.0
 
May 25, 2019, 10 a.m. 6.1 ppb (6) 0.2 ppb (0) 7.3 ppb (7) 6.0 ppb (6) N/A N/A 30.0 ppb (23) 0.17 ppb (2) N/A 8.2 μg/m3 (34) 34.0
 
May 25, 2019, 9 a.m. 6.5 ppb (6) 0.3 ppb (0) 7.6 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 27.0 ppb (21) 0.18 ppb (2) N/A 10.2 μg/m3 (42) 42.0
 
May 25, 2019, 8 a.m. 3.6 ppb (3) 0.2 ppb (0) 4.3 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 30.0 ppb (23) 0.18 ppb (2) N/A 6.8 μg/m3 (28) 28.0
 
May 25, 2019, 7 a.m. 1.8 ppb (2) 0.2 ppb (0) 2.9 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) 38.0 ppb (29) 0.16 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
May 25, 2019, 6 a.m. 5.9 ppb (5) 0.2 ppb (0) 6.9 ppb (6) 6.0 ppb (6) N/A 1.0 ppb (1) 37.0 ppb (28) 0.19 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
May 25, 2019, 5 a.m. 3.1 ppb (3) 0.2 ppb (0) 4.4 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (1) 39.0 ppb (30) 0.18 ppb (2) N/A 8.8 μg/m3 (37) 37.0
 
May 25, 2019, 4 a.m. 6.4 ppb (6) 0.2 ppb (0) 7.5 ppb (7) 6.0 ppb (6) N/A 1.0 ppb (1) 33.0 ppb (25) 0.18 ppb (2) N/A 7.2 μg/m3 (30) 30.0
 
May 25, 2019, 3 a.m. 8.5 ppb (8) 0.3 ppb (0) 9.8 ppb (9) 9.0 ppb (8) N/A 1.0 ppb (1) 28.0 ppb (22) 0.2 ppb (2) N/A 6.4 μg/m3 (27) 27.0
 
May 25, 2019, 2 a.m. 9.5 ppb (9) 0.2 ppb (0) 10.8 ppb (10) 9.0 ppb (8) N/A 2.0 ppb (3) 23.0 ppb (18) 0.2 ppb (2) N/A 9.9 μg/m3 (41) 41.0
 
May 25, 2019, 1 a.m. 8.1 ppb (8) 0.7 ppb (1) 9.2 ppb (9) 8.0 ppb (7) N/A 2.0 ppb (3) 26.0 ppb (20) 0.19 ppb (2) N/A 7.4 μg/m3 (31) 31.0
 
May 25, 2019, midnight 3.6 ppb (3) 0.3 ppb (0) 5.0 ppb (5) 4.0 ppb (4) N/A 1.0 ppb (1) 33.0 ppb (25) 0.17 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
May 24, 2019, 11 p.m. 2.6 ppb (2) 0.2 ppb (0) 4.2 ppb (4) 2.0 ppb (2) N/A 1.0 ppb (1) 35.0 ppb (27) 0.16 ppb (2) N/A 10.1 μg/m3 (42) 42.0
 
May 24, 2019, 10 p.m. 2.6 ppb (2) 0.2 ppb (0) 4.3 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 37.0 ppb (28) 0.17 ppb (2) N/A 6.9 μg/m3 (29) 29.0
 
May 24, 2019, 9 p.m. 2.8 ppb (3) 0.6 ppb (1) 4.7 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 34.0 ppb (26) 0.17 ppb (2) N/A 3.2 μg/m3 (13) 26.0
 
May 24, 2019, 8 p.m. 3.4 ppb (3) 0.6 ppb (1) 5.1 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 33.0 ppb (25) 0.18 ppb (2) N/A 9.4 μg/m3 (39) 39.0
 
May 24, 2019, 7 p.m. 2.3 ppb (2) 0.8 ppb (1) 4.3 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 35.0 ppb (27) 0.17 ppb (2) N/A 6.8 μg/m3 (28) 28.0
 
May 24, 2019, 6 p.m. 1.7 ppb (2) 0.4 ppb (0) 3.5 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 35.0 ppb (27) 0.19 ppb (2) N/A 7.1 μg/m3 (30) 30.0
 
May 24, 2019, 5 p.m. 2.2 ppb (2) 0.3 ppb (0) 3.9 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 36.0 ppb (28) 0.17 ppb (2) N/A N/A 28.0
 
May 24, 2019, 4 p.m. 2.3 ppb (2) 1.0 ppb (1) 3.5 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 34.0 ppb (26) 0.18 ppb (2) N/A N/A 26.0
 
May 24, 2019, 3 p.m. 2.6 ppb (2) 0.9 ppb (1) 4.2 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 34.0 ppb (26) 0.23 ppb (3) N/A N/A 26.0
 
May 24, 2019, 2 p.m. 6.5 ppb (6) 2.4 ppb (2) 8.7 ppb (8) 4.0 ppb (4) N/A 0.0 ppb (0) 32.0 ppb (25) 0.22 ppb (2) N/A N/A 25.0
 
May 24, 2019, 1 p.m. 8.9 ppb (8) 2.8 ppb (3) 10.5 ppb (10) 6.0 ppb (6) N/A 0.0 ppb (0) 23.0 ppb (18) 0.23 ppb (3) N/A N/A 18.0
 
May 24, 2019, noon 12.7 ppb (12) 3.0 ppb (3) 13.3 ppb (12) 10.0 ppb (9) N/A 0.0 ppb (0) 16.0 ppb (12) 0.29 ppb (3) N/A 12.8 μg/m3 (52) 52.0
 
May 24, 2019, 11 a.m. 13.1 ppb (12) 1.5 ppb (1) 14.1 ppb (13) 12.0 ppb (11) N/A 1.0 ppb (1) 13.0 ppb (10) N/A N/A 14.2 μg/m3 (55) 55.0
 
May 24, 2019, 10 a.m. 16.6 ppb (15) 0.5 ppb (0) 15.8 ppb (15) 16.0 ppb (15) N/A 0.0 ppb (0) 11.0 ppb (8) N/A N/A 13.6 μg/m3 (53) 53.0
 
May 24, 2019, 9 a.m. 7.8 ppb (7) 0.2 ppb (0) 9.8 ppb (9) 8.0 ppb (7) N/A 0.0 ppb (0) 17.0 ppb (13) 0.21 ppb (2) N/A 15.2 μg/m3 (57) 57.0
 
May 24, 2019, 8 a.m. 8.0 ppb (7) 0.2 ppb (0) 9.4 ppb (9) 8.0 ppb (7) N/A 0.0 ppb (0) 24.0 ppb (18) 0.23 ppb (3) N/A 9.1 μg/m3 (38) 38.0
 
May 24, 2019, 7 a.m. 8.8 ppb (8) 0.2 ppb (0) 10.5 ppb (10) 9.0 ppb (8) N/A 0.0 ppb (0) 30.0 ppb (23) 0.21 ppb (2) N/A 10.2 μg/m3 (42) 42.0
 
May 24, 2019, 6 a.m. 16.0 ppb (15) 0.2 ppb (0) 18.1 ppb (17) 16.0 ppb (15) N/A 0.0 ppb (0) 27.0 ppb (21) 0.3 ppb (3) N/A 12.1 μg/m3 (50) 50.0
 
May 24, 2019, 5 a.m. 26.5 ppb (25) 1.9 ppb (2) 27.5 ppb (25) 25.0 ppb (23) N/A 0.0 ppb (0) 16.0 ppb (12) 0.39 ppb (4) N/A 7.9 μg/m3 (33) 33.0
 
May 24, 2019, 4 a.m. 29.2 ppb (27) 1.8 ppb (2) 30.8 ppb (29) 28.0 ppb (26) N/A 0.0 ppb (0) 12.0 ppb (9) 0.37 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
May 24, 2019, 3 a.m. 25.8 ppb (24) 0.7 ppb (1) 27.8 ppb (26) 25.0 ppb (23) N/A 0.0 ppb (0) 18.0 ppb (14) 0.35 ppb (4) N/A 11.6 μg/m3 (48) 48.0
 
May 24, 2019, 2 a.m. 23.9 ppb (22) 1.1 ppb (1) 24.6 ppb (23) 23.0 ppb (21) N/A 0.0 ppb (0) 24.0 ppb (18) 0.32 ppb (4) N/A 8.1 μg/m3 (34) 34.0
 
May 24, 2019, 1 a.m. 17.3 ppb (16) 0.3 ppb (0) 19.2 ppb (18) 17.0 ppb (16) N/A 0.0 ppb (0) 33.0 ppb (25) 0.28 ppb (3) N/A 7.1 μg/m3 (30) 30.0
 
May 24, 2019, midnight 10.0 ppb (9) 0.4 ppb (0) 12.4 ppb (11) 10.0 ppb (9) N/A 0.0 ppb (0) 40.0 ppb (31) 0.25 ppb (3) N/A 7.8 μg/m3 (32) 32.0
 
May 23, 2019, 11 p.m. 8.8 ppb (8) 1.1 ppb (1) 11.2 ppb (10) 8.0 ppb (7) N/A 0.0 ppb (0) 43.0 ppb (33) 0.23 ppb (3) N/A 8.9 μg/m3 (37) 37.0
 
May 23, 2019, 10 p.m. 5.8 ppb (5) 1.1 ppb (1) 7.8 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 44.0 ppb (34) 0.21 ppb (2) N/A 9.6 μg/m3 (40) 40.0
 
May 23, 2019, 9 p.m. 1.7 ppb (2) 0.2 ppb (0) 4.3 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 48.0 ppb (37) 0.2 ppb (2) N/A 7.0 μg/m3 (29) 37.0
 
May 23, 2019, 8 p.m. 5.6 ppb (5) 1.5 ppb (1) 7.1 ppb (7) 4.0 ppb (4) N/A 1.0 ppb (1) 47.0 ppb (36) 0.25 ppb (3) N/A 7.3 μg/m3 (30) 36.0
 
May 23, 2019, 7 p.m. 12.0 ppb (11) 3.3 ppb (3) 16.0 ppb (15) 9.0 ppb (8) N/A 1.0 ppb (1) 40.0 ppb (31) 0.27 ppb (3) N/A 10.6 μg/m3 (44) 44.0
 
May 23, 2019, 6 p.m. 18.7 ppb (17) 5.1 ppb (5) 21.0 ppb (19) 14.0 ppb (13) N/A 1.0 ppb (1) 32.0 ppb (25) 0.33 ppb (4) N/A N/A 25.0
 
May 23, 2019, 5 p.m. 21.2 ppb (20) 4.0 ppb (4) 24.5 ppb (23) 17.0 ppb (16) N/A 0.0 ppb (0) 29.0 ppb (22) 0.26 ppb (3) N/A N/A 23.0
 
May 23, 2019, 4 p.m. 18.3 ppb (17) 4.4 ppb (4) N/A 14.0 ppb (13) N/A 0.0 ppb (0) 22.0 ppb (17) 0.29 ppb (3) N/A N/A 17.0
 
May 23, 2019, 3 p.m. 23.3 ppb (22) 7.0 ppb (6) N/A 16.0 ppb (15) N/A 0.0 ppb (0) 19.0 ppb (15) 0.39 ppb (4) N/A N/A 22.0
 
May 23, 2019, 2 p.m. 24.9 ppb (23) 7.4 ppb (7) N/A 18.0 ppb (17) N/A 0.0 ppb (0) N/A 0.38 ppb (4) N/A N/A 23.0
 
May 23, 2019, 1 p.m. 29.8 ppb (28) 9.6 ppb (9) N/A 20.0 ppb (19) N/A 0.0 ppb (0) 13.0 ppb (10) 0.49 ppb (5) N/A N/A 28.0
 
May 23, 2019, noon 49.8 ppb (46) 25.3 ppb (23) 50.9 ppb (47) 25.0 ppb (23) N/A 0.0 ppb (0) 8.0 ppb (6) 0.46 ppb (5) N/A N/A 47.0
 
May 23, 2019, 11 a.m. 18.7 ppb (17) 3.6 ppb (3) 18.7 ppb (17) 15.0 ppb (14) N/A N/A 15.0 ppb (12) 0.3 ppb (3) N/A N/A 17.0
 
May 23, 2019, 10 a.m. 9.1 ppb (8) 1.2 ppb (1) 9.5 ppb (9) 8.0 ppb (7) N/A N/A 25.0 ppb (19) 0.2 ppb (2) N/A N/A 19.0
 
May 23, 2019, 9 a.m. 1.4 ppb (1) 0.2 ppb (0) 2.1 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 37.0 ppb (28) 0.14 ppb (2) N/A N/A 28.0
 
May 23, 2019, 8 a.m. 2.5 ppb (2) 0.2 ppb (0) 3.3 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 31.0 ppb (24) 0.17 ppb (2) N/A N/A 24.0
 
May 23, 2019, 7 a.m. 4.4 ppb (4) 0.2 ppb (0) 5.2 ppb (5) 5.0 ppb (5) N/A 0.0 ppb (0) 23.0 ppb (18) 0.17 ppb (2) N/A N/A 18.0
 
May 23, 2019, 6 a.m. 9.3 ppb (9) 0.2 ppb (0) 10.0 ppb (9) 9.0 ppb (8) N/A 1.0 ppb (1) 20.0 ppb (15) 0.18 ppb (2) N/A N/A 15.0
 
May 23, 2019, 5 a.m. 6.0 ppb (6) 0.2 ppb (0) 6.9 ppb (6) 6.0 ppb (6) N/A 1.0 ppb (1) 25.0 ppb (19) 0.19 ppb (2) N/A N/A 19.0
 
May 23, 2019, 4 a.m. 6.7 ppb (6) 0.2 ppb (0) 7.5 ppb (7) 7.0 ppb (6) N/A 0.0 ppb (0) 27.0 ppb (21) 0.21 ppb (2) N/A N/A 21.0
 
May 23, 2019, 3 a.m. 6.4 ppb (6) 0.2 ppb (0) 7.4 ppb (7) 7.0 ppb (6) N/A 0.0 ppb (0) 27.0 ppb (21) 0.21 ppb (2) N/A N/A 21.0
 
May 23, 2019, 2 a.m. 8.0 ppb (7) 0.2 ppb (0) 8.9 ppb (8) 8.0 ppb (7) N/A 0.0 ppb (0) 26.0 ppb (20) 0.22 ppb (2) N/A N/A 20.0
 
May 23, 2019, 1 a.m. 11.9 ppb (11) 0.3 ppb (0) 12.7 ppb (12) 12.0 ppb (11) N/A 0.0 ppb (0) 24.0 ppb (18) 0.23 ppb (3) N/A N/A 18.0
 
May 23, 2019, midnight 7.3 ppb (7) 0.3 ppb (0) 8.7 ppb (8) 7.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (22) 0.22 ppb (2) N/A N/A 22.0
 
May 22, 2019, 11 p.m. 5.8 ppb (5) 0.7 ppb (1) 7.2 ppb (7) 5.0 ppb (5) N/A 1.0 ppb (1) 36.0 ppb (28) 0.21 ppb (2) N/A N/A 28.0
 
May 22, 2019, 10 p.m. N/A N/A 6.4 ppb (6) N/A N/A 1.0 ppb (1) 45.0 ppb (35) 0.19 ppb (2) N/A N/A 35.0
 
May 22, 2019, 9 p.m. N/A N/A 6.8 ppb (6) N/A N/A 1.0 ppb (1) 47.0 ppb (36) 0.19 ppb (2) N/A N/A 36.0
 
May 22, 2019, 8 p.m. N/A N/A 5.7 ppb (5) N/A N/A N/A 49.0 ppb (38) 0.19 ppb (2) N/A N/A 38.0
 
May 22, 2019, 7 p.m. N/A N/A 5.7 ppb (5) N/A N/A N/A 50.0 ppb (38) N/A N/A N/A 38.0
 
May 22, 2019, 6 p.m. 3.4 ppb (3) 0.7 ppb (1) 5.1 ppb (5) 3.0 ppb (3) N/A N/A 50.0 ppb (38) N/A N/A N/A 38.0
 
May 22, 2019, 5 p.m. 3.7 ppb (3) 0.9 ppb (1) 5.5 ppb (5) 3.0 ppb (3) N/A 1.0 ppb (1) 48.0 ppb (37) N/A N/A N/A 37.0
 
May 22, 2019, 4 p.m. 4.7 ppb (4) 1.2 ppb (1) 6.7 ppb (6) 4.0 ppb (4) N/A 1.0 ppb (1) 48.0 ppb (37) N/A N/A N/A 37.0
 
May 22, 2019, 3 p.m. 8.5 ppb (8) 2.1 ppb (2) 10.2 ppb (9) 6.0 ppb (6) N/A 1.0 ppb (1) 44.0 ppb (34) 0.23 ppb (3) N/A N/A 34.0
 
May 22, 2019, 2 p.m. 7.4 ppb (7) 2.0 ppb (2) 8.7 ppb (8) 5.0 ppb (5) N/A 1.0 ppb (1) 43.0 ppb (33) 0.2 ppb (2) N/A N/A 33.0
 
May 22, 2019, 1 p.m. 14.2 ppb (13) 3.6 ppb (3) 15.5 ppb (14) 11.0 ppb (10) N/A 1.0 ppb (1) 36.0 ppb (28) 0.23 ppb (3) N/A N/A 28.0
 
May 22, 2019, noon 12.9 ppb (12) 2.4 ppb (2) 14.0 ppb (13) 11.0 ppb (10) N/A 1.0 ppb (1) 34.0 ppb (26) 0.23 ppb (3) N/A N/A 26.0
 
May 22, 2019, 11 a.m. 7.2 ppb (7) 0.3 ppb (0) 8.0 ppb (7) 7.0 ppb (6) N/A 0.0 ppb (0) 39.0 ppb (30) N/A N/A N/A 30.0
 
May 22, 2019, 10 a.m. 7.0 ppb (6) 0.2 ppb (0) 7.7 ppb (7) 7.0 ppb (6) N/A 0.0 ppb (0) 40.0 ppb (31) N/A N/A N/A 31.0
 
May 22, 2019, 9 a.m. 8.8 ppb (8) 0.2 ppb (0) 9.3 ppb (9) 9.0 ppb (8) N/A 0.0 ppb (0) 39.0 ppb (30) 0.15 ppb (2) N/A N/A 30.0
 
May 22, 2019, 8 a.m. 8.3 ppb (8) 0.2 ppb (0) 9.0 ppb (8) 8.0 ppb (7) N/A 0.0 ppb (0) 42.0 ppb (32) 0.15 ppb (2) N/A N/A 32.0
 
May 22, 2019, 7 a.m. 5.7 ppb (5) 0.2 ppb (0) 6.6 ppb (6) 6.0 ppb (6) N/A 0.0 ppb (0) 46.0 ppb (35) 0.16 ppb (2) N/A N/A 35.0
 
May 22, 2019, 6 a.m. 6.9 ppb (6) 0.1 ppb (0) 7.6 ppb (7) 7.0 ppb (6) N/A 0.0 ppb (0) 46.0 ppb (35) 0.15 ppb (2) N/A N/A 35.0
 
May 22, 2019, 5 a.m. 8.2 ppb (8) 0.1 ppb (0) 9.0 ppb (8) 8.0 ppb (7) N/A 0.0 ppb (0) 46.0 ppb (35) 0.15 ppb (2) N/A N/A 35.0
 
May 22, 2019, 4 a.m. 11.3 ppb (10) 0.4 ppb (0) 12.0 ppb (11) 11.0 ppb (10) N/A 0.0 ppb (0) 46.0 ppb (35) 0.17 ppb (2) N/A N/A 35.0
 
May 22, 2019, 3 a.m. 13.0 ppb (12) 0.3 ppb (0) 12.5 ppb (12) 13.0 ppb (12) N/A 0.0 ppb (0) 43.0 ppb (33) 0.2 ppb (2) N/A N/A 33.0
 
May 22, 2019, 2 a.m. 18.3 ppb (17) 0.6 ppb (1) 18.6 ppb (17) 18.0 ppb (17) N/A 0.0 ppb (0) 35.0 ppb (27) 0.19 ppb (2) N/A N/A 27.0
 
May 22, 2019, 1 a.m. 6.4 ppb (6) 0.5 ppb (0) 6.4 ppb (6) 6.0 ppb (6) N/A 0.0 ppb (0) 40.0 ppb (31) 0.2 ppb (2) N/A 0.0 μg/m3 (0) 31.0
 
May 22, 2019, midnight 2.2 ppb (2) 0.2 ppb (0) 3.5 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 44.0 ppb (34) 0.17 ppb (2) N/A 4.4 μg/m3 (18) 34.0
 
May 21, 2019, 11 p.m. 7.6 ppb (7) 1.1 ppb (1) 9.7 ppb (9) 7.0 ppb (6) N/A 0.0 ppb (0) 32.0 ppb (25) 0.23 ppb (3) N/A 4.8 μg/m3 (20) 25.0
 
May 21, 2019, 10 p.m. 9.4 ppb (9) 2.1 ppb (2) 11.2 ppb (10) 7.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (22) 0.23 ppb (3) N/A 19.1 μg/m3 (65) 65.0
 
May 21, 2019, 9 p.m. 15.1 ppb (14) 5.3 ppb (5) 15.9 ppb (15) 10.0 ppb (9) N/A 0.0 ppb (0) 26.0 ppb (20) 0.26 ppb (3) N/A 13.4 μg/m3 (53) 53.0
 
May 21, 2019, 8 p.m. 15.3 ppb (14) 5.5 ppb (5) 17.5 ppb (16) 10.0 ppb (9) N/A 0.0 ppb (0) 24.0 ppb (18) 0.24 ppb (3) N/A 16.8 μg/m3 (60) 60.0
 
May 21, 2019, 7 p.m. 21.9 ppb (20) 8.2 ppb (8) 22.7 ppb (21) 14.0 ppb (13) N/A 1.0 ppb (1) 19.0 ppb (15) 0.24 ppb (3) N/A 14.7 μg/m3 (56) 56.0
 
May 21, 2019, 6 p.m. 15.4 ppb (14) 6.7 ppb (6) 17.8 ppb (16) 9.0 ppb (8) N/A 1.0 ppb (1) 20.0 ppb (15) 0.22 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
May 21, 2019, 5 p.m. 12.8 ppb (12) 6.1 ppb (6) 14.6 ppb (14) 7.0 ppb (6) N/A 0.0 ppb (0) 18.0 ppb (14) 0.22 ppb (2) N/A 7.9 μg/m3 (33) 33.0
 
May 21, 2019, 4 p.m. 16.5 ppb (15) 8.6 ppb (8) 17.9 ppb (17) 8.0 ppb (7) N/A 0.0 ppb (0) 15.0 ppb (12) 0.19 ppb (2) N/A 7.1 μg/m3 (30) 30.0
 
May 21, 2019, 3 p.m. 15.1 ppb (14) 6.8 ppb (6) 16.2 ppb (15) 8.0 ppb (7) N/A 0.0 ppb (0) 14.0 ppb (11) 0.18 ppb (2) N/A 10.9 μg/m3 (45) 45.0
 
May 21, 2019, 2 p.m. 15.9 ppb (15) 7.6 ppb (7) 17.8 ppb (16) 8.0 ppb (7) N/A 0.0 ppb (0) 14.0 ppb (11) 0.18 ppb (2) N/A 8.1 μg/m3 (34) 34.0
 
May 21, 2019, 1 p.m. 12.8 ppb (12) 6.1 ppb (6) 13.7 ppb (13) 7.0 ppb (6) N/A 0.0 ppb (0) 17.0 ppb (13) 0.18 ppb (2) N/A 5.3 μg/m3 (22) 22.0
 
May 21, 2019, noon 16.3 ppb (15) 7.0 ppb (6) 17.6 ppb (16) 9.0 ppb (8) N/A 0.0 ppb (0) 15.0 ppb (12) 0.2 ppb (2) N/A 4.5 μg/m3 (19) 19.0
 
May 21, 2019, 11 a.m. 11.8 ppb (11) 4.1 ppb (4) 13.0 ppb (12) 8.0 ppb (7) N/A N/A 19.0 ppb (15) 0.18 ppb (2) N/A 5.3 μg/m3 (22) 22.0
 
May 21, 2019, 10 a.m. 6.5 ppb (6) 1.7 ppb (2) 7.1 ppb (7) 5.0 ppb (5) N/A N/A 23.0 ppb (18) 0.15 ppb (2) N/A 2.5 μg/m3 (10) 18.0
 
May 21, 2019, 9 a.m. 9.0 ppb (8) 1.5 ppb (1) 10.0 ppb (9) 8.0 ppb (7) N/A 1.0 ppb (1) 19.0 ppb (15) 0.17 ppb (2) N/A -0.6 μg/m3 (0) 15.0
 
May 21, 2019, 8 a.m. 9.2 ppb (9) 1.5 ppb (1) 10.0 ppb (9) 8.0 ppb (7) N/A 1.0 ppb (1) 15.0 ppb (12) 0.17 ppb (2) N/A 13.2 μg/m3 (53) 53.0
 
May 21, 2019, 7 a.m. 2.9 ppb (3) 0.3 ppb (0) 3.8 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 21.0 ppb (16) 0.13 ppb (1) N/A 20.0 μg/m3 (67) 67.0
 
May 21, 2019, 6 a.m. 3.6 ppb (3) 0.4 ppb (0) 4.8 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 23.0 ppb (18) 0.12 ppb (1) N/A 0.1 μg/m3 (0) 18.0
 
May 21, 2019, 5 a.m. 4.4 ppb (4) 0.7 ppb (1) 5.7 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 25.0 ppb (19) 0.13 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
May 21, 2019, 4 a.m. 5.8 ppb (5) 1.0 ppb (1) 7.3 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 27.0 ppb (21) 0.14 ppb (2) N/A 9.6 μg/m3 (40) 40.0
 
May 21, 2019, 3 a.m. 6.4 ppb (6) 0.7 ppb (1) 7.7 ppb (7) 6.0 ppb (6) N/A 2.0 ppb (3) 28.0 ppb (22) 0.18 ppb (2) N/A 1.5 μg/m3 (6) 22.0
 
May 21, 2019, 2 a.m. 7.4 ppb (7) 1.2 ppb (1) 8.6 ppb (8) 6.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (22) 0.15 ppb (2) N/A 4.6 μg/m3 (19) 22.0
 
May 21, 2019, 1 a.m. 9.2 ppb (9) 1.5 ppb (1) 10.1 ppb (9) 8.0 ppb (7) N/A 1.0 ppb (1) 27.0 ppb (21) 0.18 ppb (2) N/A 7.5 μg/m3 (31) 31.0
 
May 21, 2019, midnight 9.9 ppb (9) 2.0 ppb (2) 11.0 ppb (10) 8.0 ppb (7) N/A 1.0 ppb (1) 26.0 ppb (20) 0.2 ppb (2) N/A 3.0 μg/m3 (12) 20.0
 
May 20, 2019, 11 p.m. 9.7 ppb (9) 2.5 ppb (2) 10.8 ppb (10) 7.0 ppb (6) N/A 1.0 ppb (1) 29.0 ppb (22) 0.19 ppb (2) N/A 1.8 μg/m3 (8) 22.0
 
May 20, 2019, 10 p.m. 8.2 ppb (8) 1.8 ppb (2) 10.0 ppb (9) 6.0 ppb (6) N/A 0.0 ppb (0) 33.0 ppb (25) 0.16 ppb (2) N/A 3.7 μg/m3 (15) 25.0
 
May 20, 2019, 9 p.m. 6.2 ppb (6) 1.4 ppb (1) 8.3 ppb (8) 5.0 ppb (5) N/A 0.0 ppb (0) 35.0 ppb (27) 0.15 ppb (2) N/A 2.6 μg/m3 (11) 27.0
 
May 20, 2019, 8 p.m. 6.4 ppb (6) 1.6 ppb (1) 7.8 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 35.0 ppb (27) 0.16 ppb (2) N/A -2.4 μg/m3 (0) 27.0
 
May 20, 2019, 7 p.m. 7.3 ppb (7) 2.7 ppb (3) 9.8 ppb (9) 5.0 ppb (5) N/A 0.0 ppb (0) 37.0 ppb (28) 0.17 ppb (2) N/A -0.2 μg/m3 (0) 28.0
 
May 20, 2019, 6 p.m. 4.0 ppb (4) 1.7 ppb (2) 5.7 ppb (5) 2.0 ppb (2) N/A 0.0 ppb (0) 39.0 ppb (30) 0.14 ppb (2) N/A 0.4 μg/m3 (2) 30.0
 
May 20, 2019, 5 p.m. 2.7 ppb (3) 0.8 ppb (1) 4.0 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 38.0 ppb (29) 0.13 ppb (1) N/A 4.1 μg/m3 (17) 29.0
 
May 20, 2019, 4 p.m. 6.3 ppb (6) 3.0 ppb (3) 7.4 ppb (7) 4.0 ppb (4) N/A 0.0 ppb (0) 34.0 ppb (26) 0.15 ppb (2) N/A 4.7 μg/m3 (20) 26.0
 
May 20, 2019, 3 p.m. 7.9 ppb (7) 3.6 ppb (3) 8.7 ppb (8) 5.0 ppb (5) N/A 0.0 ppb (0) 29.0 ppb (22) 0.19 ppb (2) N/A -0.2 μg/m3 (0) 22.0
 
May 20, 2019, 2 p.m. 11.4 ppb (11) 4.1 ppb (4) 10.1 ppb (9) 7.0 ppb (6) N/A 0.0 ppb (0) 27.0 ppb (21) 0.2 ppb (2) N/A 5.1 μg/m3 (21) 21.0
 
May 20, 2019, 1 p.m. 8.3 ppb (8) 3.1 ppb (3) 9.3 ppb (9) 5.0 ppb (5) N/A 0.0 ppb (0) 25.0 ppb (19) 0.2 ppb (2) N/A 6.3 μg/m3 (26) 26.0
 
May 20, 2019, noon 8.2 ppb (8) 2.7 ppb (3) 8.8 ppb (8) 6.0 ppb (6) N/A 0.0 ppb (0) 22.0 ppb (17) 0.2 ppb (2) N/A 3.1 μg/m3 (13) 17.0
 
May 20, 2019, 11 a.m. 11.5 ppb (11) 2.6 ppb (2) 11.2 ppb (10) 10.0 ppb (9) N/A 0.0 ppb (0) 19.0 ppb (15) N/A N/A 2.4 μg/m3 (10) 15.0
 
May 20, 2019, 10 a.m. 3.9 ppb (4) 0.2 ppb (0) 4.5 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 23.0 ppb (18) N/A N/A N/A 18.0
 
May 20, 2019, 9 a.m. 3.0 ppb (3) 0.1 ppb (0) 3.7 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 23.0 ppb (18) 0.13 ppb (1) N/A 8.7 μg/m3 (36) 36.0
 
May 20, 2019, 8 a.m. 3.9 ppb (4) 0.2 ppb (0) 4.7 ppb (4) 4.0 ppb (4) N/A 1.0 ppb (1) 22.0 ppb (17) 0.15 ppb (2) N/A 1.6 μg/m3 (7) 17.0
 
May 20, 2019, 7 a.m. 3.6 ppb (3) 0.2 ppb (0) 4.4 ppb (4) 4.0 ppb (4) N/A 1.0 ppb (1) 23.0 ppb (18) 0.17 ppb (2) N/A 2.0 μg/m3 (8) 18.0
 
May 20, 2019, 6 a.m. 3.6 ppb (3) 0.1 ppb (0) 4.3 ppb (4) 4.0 ppb (4) N/A 1.0 ppb (1) 23.0 ppb (18) 0.18 ppb (2) N/A 2.4 μg/m3 (10) 18.0
 
May 20, 2019, 5 a.m. 2.4 ppb (2) 0.1 ppb (0) 3.3 ppb (3) 3.0 ppb (3) N/A 1.0 ppb (1) 25.0 ppb (19) 0.17 ppb (2) N/A 3.2 μg/m3 (13) 19.0
 
May 20, 2019, 4 a.m. 1.6 ppb (1) 0.2 ppb (0) 2.3 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 27.0 ppb (21) 0.13 ppb (1) N/A 1.4 μg/m3 (6) 21.0
 
May 20, 2019, 3 a.m. 1.9 ppb (2) 0.1 ppb (0) 2.8 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 31.0 ppb (24) 0.14 ppb (2) N/A 5.6 μg/m3 (23) 24.0
 
May 20, 2019, 2 a.m. 2.7 ppb (3) 0.1 ppb (0) 3.6 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 33.0 ppb (25) 0.17 ppb (2) N/A 5.0 μg/m3 (21) 25.0
 
May 20, 2019, 1 a.m. 2.3 ppb (2) 0.1 ppb (0) 3.4 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) 0.18 ppb (2) N/A 3.7 μg/m3 (15) 32.0
 
May 20, 2019, midnight 1.2 ppb (1) 0.1 ppb (0) 2.4 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 51.0 ppb (39) 0.15 ppb (2) N/A 5.3 μg/m3 (22) 39.0
 
May 19, 2019, 11 p.m. 1.8 ppb (2) 0.2 ppb (0) 3.4 ppb (3) 2.0 ppb (2) N/A 3.0 ppb (4) 58.0 ppb (45) 0.17 ppb (2) N/A 6.3 μg/m3 (26) 45.0
 
May 19, 2019, 10 p.m. 1.2 ppb (1) 0.2 ppb (0) 3.0 ppb (3) 1.0 ppb (1) N/A 1.0 ppb (1) 59.0 ppb (45) 0.15 ppb (2) N/A 3.8 μg/m3 (16) 45.0
 
May 19, 2019, 9 p.m. 0.9 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 60.0 ppb (46) 0.14 ppb (2) N/A 0.9 μg/m3 (4) 46.0
 
May 19, 2019, 8 p.m. 0.6 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 2.0 ppb (3) 62.0 ppb (48) 0.14 ppb (2) N/A -4.6 μg/m3 (0) 48.0
 
May 19, 2019, 7 p.m. 0.7 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 60.0 ppb (46) 0.15 ppb (2) N/A 19.5 μg/m3 (66) 66.0
 
May 19, 2019, 6 p.m. 0.6 ppb (1) 0.1 ppb (0) 2.4 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 58.0 ppb (45) 0.14 ppb (2) N/A -4.0 μg/m3 (0) 45.0
 
May 19, 2019, 5 p.m. 1.2 ppb (1) 0.2 ppb (0) 2.6 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 45.0 ppb (35) 0.16 ppb (2) N/A 14.7 μg/m3 (56) 56.0
 
May 19, 2019, 4 p.m. 1.3 ppb (1) 0.3 ppb (0) 2.7 ppb (3) 1.0 ppb (1) N/A 0.0 ppb (0) 44.0 ppb (34) 0.16 ppb (2) N/A 13.1 μg/m3 (52) 52.0
 
May 19, 2019, 3 p.m. 0.9 ppb (1) 0.2 ppb (0) 2.5 ppb (2) 1.0 ppb (1) N/A 0.0 ppb (0) 45.0 ppb (35) 0.16 ppb (2) N/A 11.1 μg/m3 (46) 46.0
 
May 19, 2019, 2 p.m. 3.1 ppb (3) 0.5 ppb (0) 4.6 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 45.0 ppb (35) 0.16 ppb (2) N/A 12.8 μg/m3 (52) 52.0
 
May 19, 2019, 1 p.m. 3.3 ppb (3) 0.2 ppb (0) 4.4 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (1) 46.0 ppb (35) 0.15 ppb (2) N/A 7.2 μg/m3 (30) 35.0
 
May 19, 2019, noon 2.7 ppb (3) 0.2 ppb (0) 3.7 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 47.0 ppb (36) 0.14 ppb (2) N/A 5.2 μg/m3 (22) 36.0
 
May 19, 2019, 11 a.m. 5.4 ppb (5) 0.2 ppb (0) 6.3 ppb (6) 6.0 ppb (6) N/A N/A 44.0 ppb (34) 0.14 ppb (2) N/A 1.9 μg/m3 (8) 34.0
 
May 19, 2019, 10 a.m. 2.4 ppb (2) 0.2 ppb (0) 3.4 ppb (3) 3.0 ppb (3) N/A N/A 44.0 ppb (34) 0.14 ppb (2) N/A 1.2 μg/m3 (5) 34.0
 
May 19, 2019, 9 a.m. 4.7 ppb (4) 0.1 ppb (0) 5.6 ppb (5) 5.0 ppb (5) N/A 0.0 ppb (0) 42.0 ppb (32) 0.14 ppb (2) N/A 3.4 μg/m3 (14) 32.0
 
May 19, 2019, 8 a.m. 4.5 ppb (4) 0.1 ppb (0) 5.5 ppb (5) 5.0 ppb (5) N/A 0.0 ppb (0) 46.0 ppb (35) 0.14 ppb (2) N/A 5.7 μg/m3 (24) 35.0
 
May 19, 2019, 7 a.m. 5.7 ppb (5) 0.1 ppb (0) 7.3 ppb (7) 6.0 ppb (6) N/A 1.0 ppb (1) 50.0 ppb (38) 0.15 ppb (2) N/A 0.9 μg/m3 (4) 38.0
 
May 19, 2019, 6 a.m. 3.4 ppb (3) 0.1 ppb (0) 4.6 ppb (4) 4.0 ppb (4) N/A 2.0 ppb (3) 53.0 ppb (41) 0.16 ppb (2) N/A 5.3 μg/m3 (22) 41.0
 
May 19, 2019, 5 a.m. 4.2 ppb (4) 0.3 ppb (0) 5.3 ppb (5) 4.0 ppb (4) N/A 1.0 ppb (1) 49.0 ppb (38) 0.16 ppb (2) N/A 1.3 μg/m3 (5) 38.0
 
May 19, 2019, 4 a.m. 6.2 ppb (6) 0.2 ppb (0) 7.4 ppb (7) 6.0 ppb (6) N/A 1.0 ppb (1) 44.0 ppb (34) 0.18 ppb (2) N/A 0.9 μg/m3 (4) 34.0
 
May 19, 2019, 3 a.m. 5.7 ppb (5) 0.1 ppb (0) 6.7 ppb (6) 6.0 ppb (6) N/A 0.0 ppb (0) 46.0 ppb (35) 0.18 ppb (2) N/A 0.4 μg/m3 (2) 35.0
 
May 19, 2019, 2 a.m. 2.6 ppb (2) 0.1 ppb (0) 4.0 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 48.0 ppb (37) 0.17 ppb (2) N/A 4.8 μg/m3 (20) 37.0
 
May 19, 2019, 1 a.m. 4.9 ppb (5) 0.2 ppb (0) 6.3 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 49.0 ppb (38) 0.18 ppb (2) N/A 4.2 μg/m3 (18) 38.0
 
May 19, 2019, midnight 6.8 ppb (6) 0.2 ppb (0) 7.6 ppb (7) 7.0 ppb (6) N/A 0.0 ppb (0) 50.0 ppb (38) 0.19 ppb (2) N/A 8.2 μg/m3 (34) 38.0
 
May 18, 2019, 11 p.m. 5.7 ppb (5) 0.2 ppb (0) 7.5 ppb (7) 6.0 ppb (6) N/A 1.0 ppb (1) 50.0 ppb (38) 0.18 ppb (2) N/A 10.6 μg/m3 (44) 44.0
 
May 18, 2019, 10 p.m. 1.9 ppb (2) 0.1 ppb (0) 3.7 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) 57.0 ppb (44) 0.16 ppb (2) N/A 13.9 μg/m3 (54) 54.0
 
May 18, 2019, 9 p.m. 2.9 ppb (3) 0.3 ppb (0) 4.5 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (1) 56.0 ppb (43) 0.17 ppb (2) N/A 12.7 μg/m3 (51) 51.0