ID: 1118

AQSQID: 295100085

Site Name: Blair Street

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

Updated: March 7, 2021, 5:32 a.m.

Location: Saint Louis (Hyde Park), MO

Reporting: True, Located: True

Current AQI: 46.0

Saint Louis (Hyde Park) MO, US: 38.656449, -90.198548

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 7, 2021, 4 a.m. 24.3 ppb (23) 0.9 ppb (1) 23.5 ppb (23) 24.0 ppb (23) N/A 1.0 ppb (2) 20.0 ppb (19) 0.41 ppb (5) N/A 10.9 μg/m3 (46) 46.0
 
March 7, 2021, 3 a.m. 22.8 ppb (22) 0.9 ppb (1) 18.1 ppb (18) 22.0 ppb (21) N/A 3.0 ppb (5) 27.0 ppb (25) 0.32 ppb (4) N/A 10.7 μg/m3 (45) 45.0
 
March 7, 2021, 2 a.m. 38.9 ppb (37) 2.5 ppb (3) 29.2 ppb (28) 37.0 ppb (35) N/A 2.0 ppb (3) 15.0 ppb (14) 0.39 ppb (5) N/A 14.2 μg/m3 (56) 56.0
 
March 7, 2021, 1 a.m. 22.1 ppb (21) 0.6 ppb (1) 17.5 ppb (17) 22.0 ppb (21) N/A 1.0 ppb (2) 30.0 ppb (28) 0.26 ppb (4) N/A 5.1 μg/m3 (22) 28.0
 
March 7, 2021, midnight 20.2 ppb (20) 0.9 ppb (1) 15.7 ppb (15) 19.0 ppb (18) N/A 1.0 ppb (2) 32.0 ppb (30) 0.29 ppb (4) N/A 7.7 μg/m3 (33) 33.0
 
March 6, 2021, 11 p.m. 9.6 ppb (10) 0.9 ppb (1) 8.6 ppb (9) 9.0 ppb (9) N/A 1.0 ppb (2) 42.0 ppb (39) 0.22 ppb (3) N/A 5.9 μg/m3 (25) 39.0
 
March 6, 2021, 10 p.m. 5.8 ppb (6) 1.1 ppb (2) 5.5 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 47.0 ppb (44) 0.2 ppb (3) N/A 1.3 μg/m3 (6) 44.0
 
March 6, 2021, 9 p.m. 8.4 ppb (8) 2.3 ppb (3) 8.1 ppb (8) 6.0 ppb (6) N/A 0.0 ppb (0) 45.0 ppb (42) 0.21 ppb (3) N/A 5.4 μg/m3 (23) 42.0
 
March 6, 2021, 8 p.m. 11.1 ppb (11) 2.9 ppb (3) 9.5 ppb (9) 8.0 ppb (8) N/A 0.0 ppb (0) 44.0 ppb (41) 0.23 ppb (3) N/A 7.5 μg/m3 (32) 41.0
 
March 6, 2021, 7 p.m. 4.4 ppb (5) 1.2 ppb (2) 4.4 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 46.0 ppb (43) 0.2 ppb (3) N/A 42.8 μg/m3 (119) 119.0
 
March 6, 2021, 6 p.m. 5.9 ppb (6) 1.9 ppb (2) 5.7 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 44.0 ppb (41) 0.18 ppb (3) N/A 6.4 μg/m3 (27) 41.0
 
March 6, 2021, 5 p.m. 10.7 ppb (11) 3.4 ppb (4) 10.5 ppb (10) 7.0 ppb (7) N/A 1.0 ppb (2) 39.0 ppb (37) 0.19 ppb (3) N/A 9.5 μg/m3 (40) 40.0
 
March 6, 2021, 4 p.m. 21.1 ppb (20) 7.8 ppb (8) 20.2 ppb (20) 13.0 ppb (13) N/A 1.0 ppb (2) 33.0 ppb (31) 0.23 ppb (3) N/A 14.8 μg/m3 (57) 57.0
 
March 6, 2021, 3 p.m. 35.3 ppb (34) 13.2 ppb (13) 33.3 ppb (32) 22.0 ppb (21) N/A 0.0 ppb (0) 22.0 ppb (21) 0.28 ppb (4) N/A 15.6 μg/m3 (59) 59.0
 
March 6, 2021, 2 p.m. 101.9 ppb (102) 65.1 ppb (63) 94.7 ppb (95) 37.0 ppb (35) N/A 1.0 ppb (2) 8.0 ppb (8) 0.45 ppb (6) N/A 29.5 μg/m3 (88) 102.0
 
March 6, 2021, 1 p.m. 184.4 ppb (117) 145.2 ppb (110) 174.5 ppb (115) 39.0 ppb (37) N/A 1.0 ppb (2) 1.0 ppb (1) 0.62 ppb (7) N/A 24.4 μg/m3 (77) 117.0
 
March 6, 2021, noon 183.3 ppb (117) 147.7 ppb (110) 199.2 ppb (120) 36.0 ppb (34) N/A 1.0 ppb (2) 1.0 ppb (1) 0.96 ppb (12) N/A 24.0 μg/m3 (77) 120.0
 
March 6, 2021, 11 a.m. 123.1 ppb (106) 87.7 ppb (87) 119.9 ppb (105) 35.0 ppb (34) N/A 1.0 ppb (2) 1.0 ppb (1) 1.05 ppb (13) N/A 17.6 μg/m3 (63) 106.0
 
March 6, 2021, 10 a.m. 149.8 ppb (111) 112.4 ppb (104) 140.3 ppb (109) 37.0 ppb (35) N/A 1.0 ppb (2) 1.0 ppb (1) 0.94 ppb (11) N/A 18.0 μg/m3 (64) 111.0
 
March 6, 2021, 9 a.m. 131.5 ppb (107) 94.2 ppb (94) 129.8 ppb (107) 38.0 ppb (36) N/A 1.0 ppb (2) 1.0 ppb (1) 0.93 ppb (11) N/A 16.0 μg/m3 (60) 107.0
 
March 6, 2021, 8 a.m. 91.6 ppb (92) 50.8 ppb (48) 83.6 ppb (83) 41.0 ppb (39) N/A 1.0 ppb (2) 1.0 ppb (1) 0.91 ppb (11) N/A 35.8 μg/m3 (102) 102.0
 
March 6, 2021, 7 a.m. 92.5 ppb (93) 51.5 ppb (49) 80.6 ppb (80) 41.0 ppb (39) N/A 1.0 ppb (2) 1.0 ppb (1) 1.02 ppb (12) N/A 24.6 μg/m3 (78) 93.0
 
March 6, 2021, 6 a.m. 101.7 ppb (102) 61.8 ppb (60) 89.3 ppb (89) 40.0 ppb (38) N/A 1.0 ppb (2) 2.0 ppb (2) 1.22 ppb (14) N/A 27.4 μg/m3 (84) 102.0
 
March 6, 2021, 5 a.m. 94.0 ppb (94) 52.4 ppb (50) 83.5 ppb (83) 42.0 ppb (40) N/A 1.0 ppb (2) 1.0 ppb (1) 0.97 ppb (12) N/A 12.8 μg/m3 (53) 94.0
 
March 6, 2021, 4 a.m. 72.4 ppb (71) 28.1 ppb (27) 59.1 ppb (57) 44.0 ppb (42) N/A 1.0 ppb (2) 1.0 ppb (1) 0.71 ppb (8) N/A 13.3 μg/m3 (54) 71.0
 
March 6, 2021, 3 a.m. 71.0 ppb (70) 27.0 ppb (26) 59.9 ppb (58) 44.0 ppb (42) N/A 1.0 ppb (2) 1.0 ppb (1) 0.74 ppb (8) N/A 16.0 μg/m3 (60) 70.0
 
March 6, 2021, 2 a.m. 66.0 ppb (64) 20.7 ppb (20) 51.5 ppb (49) 45.0 ppb (43) N/A 0.0 ppb (0) 1.0 ppb (1) 0.86 ppb (11) N/A 12.1 μg/m3 (51) 64.0
 
March 6, 2021, 1 a.m. 47.9 ppb (46) 5.8 ppb (6) 35.8 ppb (34) 42.0 ppb (40) N/A 0.0 ppb (0) 5.0 ppb (5) 0.55 ppb (7) N/A 7.7 μg/m3 (33) 46.0
 
March 6, 2021, midnight 30.6 ppb (29) 1.8 ppb (2) 25.8 ppb (25) 29.0 ppb (28) N/A 1.0 ppb (2) 19.0 ppb (18) 0.34 ppb (4) N/A 4.9 μg/m3 (21) 29.0
 
March 5, 2021, 11 p.m. 19.1 ppb (19) 3.6 ppb (4) 15.5 ppb (15) 16.0 ppb (16) N/A 0.0 ppb (0) 32.0 ppb (30) 0.25 ppb (3) N/A 2.7 μg/m3 (12) 30.0
 
March 5, 2021, 10 p.m. 14.0 ppb (14) 3.8 ppb (4) 11.8 ppb (12) 10.0 ppb (10) N/A 0.0 ppb (0) 35.0 ppb (33) 0.24 ppb (3) N/A 2.4 μg/m3 (10) 33.0
 
March 5, 2021, 9 p.m. 9.3 ppb (9) 2.9 ppb (3) 9.0 ppb (9) 7.0 ppb (7) N/A 0.0 ppb (0) 38.0 ppb (36) 0.2 ppb (3) N/A 3.3 μg/m3 (14) 36.0
 
March 5, 2021, 8 p.m. 13.5 ppb (13) 4.9 ppb (5) 11.4 ppb (11) 9.0 ppb (9) N/A 0.0 ppb (0) 36.0 ppb (34) 0.21 ppb (3) N/A 5.8 μg/m3 (25) 34.0
 
March 5, 2021, 7 p.m. 10.9 ppb (11) 4.2 ppb (4) 9.7 ppb (10) 7.0 ppb (7) N/A 0.0 ppb (0) 36.0 ppb (34) 0.2 ppb (3) N/A 1.7 μg/m3 (8) 34.0
 
March 5, 2021, 6 p.m. 10.7 ppb (11) 4.9 ppb (5) 10.9 ppb (11) 6.0 ppb (6) N/A 0.0 ppb (0) 36.0 ppb (34) 0.19 ppb (3) N/A 5.4 μg/m3 (23) 34.0
 
March 5, 2021, 5 p.m. 11.7 ppb (12) 4.8 ppb (5) 10.9 ppb (11) 7.0 ppb (7) N/A 0.0 ppb (0) 33.0 ppb (31) 0.18 ppb (3) N/A 4.3 μg/m3 (18) 31.0
 
March 5, 2021, 4 p.m. 13.2 ppb (13) 6.4 ppb (7) 11.8 ppb (12) 7.0 ppb (7) N/A 0.0 ppb (0) 30.0 ppb (28) 0.19 ppb (3) N/A 4.9 μg/m3 (21) 28.0
 
March 5, 2021, 3 p.m. 17.7 ppb (17) 8.4 ppb (8) 15.5 ppb (15) 9.0 ppb (9) N/A 0.0 ppb (0) 24.0 ppb (23) 0.2 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 5, 2021, 2 p.m. 21.4 ppb (21) 9.6 ppb (10) 18.3 ppb (18) 12.0 ppb (12) N/A 0.0 ppb (0) 20.0 ppb (19) 0.22 ppb (3) N/A 5.7 μg/m3 (24) 24.0
 
March 5, 2021, 1 p.m. 26.7 ppb (26) 10.5 ppb (10) 21.5 ppb (21) 16.0 ppb (16) N/A 0.0 ppb (0) 16.0 ppb (15) 0.23 ppb (3) N/A 8.9 μg/m3 (38) 38.0
 
March 5, 2021, noon 22.5 ppb (22) 6.6 ppb (7) 19.0 ppb (18) 16.0 ppb (16) N/A 0.0 ppb (0) 15.0 ppb (14) 0.24 ppb (3) N/A 8.2 μg/m3 (35) 35.0
 
March 5, 2021, 11 a.m. 22.4 ppb (22) 5.2 ppb (5) 17.7 ppb (17) 17.0 ppb (17) N/A 4.0 ppb (6) 14.0 ppb (13) 0.3 ppb (4) N/A 6.3 μg/m3 (27) 27.0
 
March 5, 2021, 10 a.m. 11.9 ppb (12) 2.4 ppb (3) 9.8 ppb (10) 10.0 ppb (10) N/A 3.0 ppb (5) 20.0 ppb (19) 0.27 ppb (4) N/A 7.7 μg/m3 (33) 33.0
 
March 5, 2021, 9 a.m. 17.3 ppb (17) 3.3 ppb (4) 14.0 ppb (14) 14.0 ppb (14) N/A 4.0 ppb (6) 16.0 ppb (15) 0.32 ppb (4) N/A 8.9 μg/m3 (38) 38.0
 
March 5, 2021, 8 a.m. 9.4 ppb (9) 1.8 ppb (2) 7.8 ppb (8) 8.0 ppb (8) N/A 1.0 ppb (2) 22.0 ppb (21) 0.28 ppb (4) N/A 4.0 μg/m3 (17) 21.0
 
March 5, 2021, 7 a.m. 20.3 ppb (20) 3.2 ppb (4) 16.5 ppb (16) 17.0 ppb (17) N/A 5.0 ppb (8) 15.0 ppb (14) 0.3 ppb (4) N/A 8.5 μg/m3 (36) 36.0
 
March 5, 2021, 6 a.m. 26.2 ppb (25) 4.7 ppb (5) 20.8 ppb (20) 22.0 ppb (21) N/A 7.0 ppb (10) 13.0 ppb (13) 0.23 ppb (3) N/A 8.3 μg/m3 (35) 35.0
 
March 5, 2021, 5 a.m. 19.5 ppb (19) 3.0 ppb (3) 15.8 ppb (15) 17.0 ppb (17) N/A 5.0 ppb (8) 19.0 ppb (18) 0.36 ppb (5) N/A 9.5 μg/m3 (40) 40.0
 
March 5, 2021, 4 a.m. 21.5 ppb (21) 3.6 ppb (4) 17.8 ppb (17) 18.0 ppb (17) N/A 7.0 ppb (10) 19.0 ppb (18) 0.32 ppb (4) N/A 11.1 μg/m3 (47) 47.0
 
March 5, 2021, 3 a.m. 18.3 ppb (18) 3.1 ppb (3) 14.6 ppb (14) 15.0 ppb (15) N/A 4.0 ppb (6) 23.0 ppb (22) 0.31 ppb (4) N/A 2.1 μg/m3 (9) 22.0
 
March 5, 2021, 2 a.m. 16.3 ppb (16) 2.6 ppb (3) 13.5 ppb (13) 14.0 ppb (14) N/A 1.0 ppb (2) 25.0 ppb (24) 0.26 ppb (4) N/A 5.5 μg/m3 (23) 24.0
 
March 5, 2021, 1 a.m. 17.9 ppb (17) 2.9 ppb (3) 15.6 ppb (15) 15.0 ppb (15) N/A 4.0 ppb (6) 28.0 ppb (26) 0.31 ppb (4) N/A 8.5 μg/m3 (36) 36.0
 
March 5, 2021, midnight 16.6 ppb (16) 2.7 ppb (3) 13.7 ppb (13) 14.0 ppb (14) N/A 0.0 ppb (0) 33.0 ppb (31) 0.24 ppb (3) N/A 5.2 μg/m3 (22) 31.0
 
March 4, 2021, 11 p.m. 17.2 ppb (17) 3.5 ppb (4) 14.9 ppb (15) 14.0 ppb (14) N/A 0.0 ppb (0) 35.0 ppb (33) 0.23 ppb (3) N/A 3.9 μg/m3 (17) 33.0
 
March 4, 2021, 10 p.m. 15.4 ppb (15) 4.3 ppb (5) 13.3 ppb (13) 11.0 ppb (11) N/A 0.0 ppb (0) 38.0 ppb (36) 0.22 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
March 4, 2021, 9 p.m. 17.2 ppb (17) 5.0 ppb (5) 15.7 ppb (15) 12.0 ppb (12) N/A 0.0 ppb (0) 39.0 ppb (37) 0.24 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 4, 2021, 8 p.m. 17.8 ppb (17) 7.0 ppb (7) 16.3 ppb (16) 11.0 ppb (11) N/A 0.0 ppb (0) 39.0 ppb (37) 0.22 ppb (3) N/A 7.0 μg/m3 (30) 37.0
 
March 4, 2021, 7 p.m. 18.0 ppb (17) 7.6 ppb (8) 16.1 ppb (16) 11.0 ppb (11) N/A 1.0 ppb (2) 38.0 ppb (36) 0.21 ppb (3) N/A 6.3 μg/m3 (27) 36.0
 
March 4, 2021, 6 p.m. 12.5 ppb (12) 4.9 ppb (5) 12.6 ppb (12) 8.0 ppb (8) N/A 1.0 ppb (2) 38.0 ppb (36) 0.2 ppb (3) N/A 12.9 μg/m3 (53) 53.0
 
March 4, 2021, 5 p.m. 15.7 ppb (15) 6.1 ppb (6) 14.9 ppb (15) 10.0 ppb (10) N/A 0.0 ppb (0) 37.0 ppb (35) 0.22 ppb (3) N/A 11.6 μg/m3 (49) 49.0
 
March 4, 2021, 4 p.m. 17.7 ppb (17) 7.0 ppb (7) 17.2 ppb (17) 11.0 ppb (11) N/A 1.0 ppb (2) 32.0 ppb (30) 0.22 ppb (3) N/A 12.2 μg/m3 (52) 52.0
 
March 4, 2021, 3 p.m. 24.5 ppb (24) 9.8 ppb (10) 22.6 ppb (22) 15.0 ppb (15) N/A 1.0 ppb (2) 29.0 ppb (27) 0.23 ppb (3) N/A 15.9 μg/m3 (59) 59.0
 
March 4, 2021, 2 p.m. 32.8 ppb (31) 13.6 ppb (13) 29.5 ppb (28) 19.0 ppb (18) N/A 1.0 ppb (2) 21.0 ppb (20) 0.26 ppb (4) N/A 16.7 μg/m3 (61) 61.0
 
March 4, 2021, 1 p.m. 67.3 ppb (66) 31.5 ppb (30) 58.6 ppb (56) 36.0 ppb (34) N/A 2.0 ppb (3) 6.0 ppb (6) 0.46 ppb (6) N/A 23.4 μg/m3 (75) 75.0
 
March 4, 2021, noon 62.4 ppb (60) 19.3 ppb (19) 56.5 ppb (54) 43.0 ppb (41) N/A 1.0 ppb (2) 2.0 ppb (2) 0.61 ppb (7) N/A 16.4 μg/m3 (61) 61.0
 
March 4, 2021, 11 a.m. 47.0 ppb (45) 8.9 ppb (9) 38.0 ppb (36) 38.0 ppb (36) N/A 1.0 ppb (2) 4.0 ppb (4) 0.66 ppb (8) N/A 13.4 μg/m3 (54) 54.0
 
March 4, 2021, 10 a.m. 48.7 ppb (46) 7.8 ppb (8) 39.1 ppb (37) 41.0 ppb (39) N/A 2.0 ppb (3) 3.0 ppb (3) 0.8 ppb (10) N/A 19.1 μg/m3 (66) 66.0
 
March 4, 2021, 9 a.m. 57.1 ppb (55) 15.3 ppb (15) 47.1 ppb (45) 42.0 ppb (40) N/A 1.0 ppb (2) 3.0 ppb (3) 0.56 ppb (7) N/A 16.7 μg/m3 (61) 61.0
 
March 4, 2021, 8 a.m. 58.0 ppb (56) 17.7 ppb (17) 52.5 ppb (50) 40.0 ppb (38) N/A 1.0 ppb (2) 1.0 ppb (1) 0.7 ppb (8) N/A 12.3 μg/m3 (52) 56.0
 
March 4, 2021, 7 a.m. 55.0 ppb (53) 12.3 ppb (12) 45.5 ppb (43) 43.0 ppb (41) N/A 1.0 ppb (2) 1.0 ppb (1) 0.58 ppb (7) N/A 19.7 μg/m3 (67) 67.0
 
March 4, 2021, 6 a.m. 60.0 ppb (58) 12.5 ppb (12) 47.3 ppb (45) 48.0 ppb (46) N/A 0.0 ppb (0) 1.0 ppb (1) 0.47 ppb (6) N/A 13.7 μg/m3 (55) 58.0
 
March 4, 2021, 5 a.m. 64.3 ppb (62) 17.0 ppb (17) 49.5 ppb (47) 47.0 ppb (45) N/A 1.0 ppb (2) 2.0 ppb (2) 0.58 ppb (7) N/A 16.7 μg/m3 (61) 62.0
 
March 4, 2021, 4 a.m. 65.9 ppb (64) 17.0 ppb (17) 51.3 ppb (49) 49.0 ppb (47) N/A 1.0 ppb (2) 2.0 ppb (2) 0.57 ppb (7) N/A 13.8 μg/m3 (55) 64.0
 
March 4, 2021, 3 a.m. 67.6 ppb (66) 16.1 ppb (16) 58.0 ppb (56) 52.0 ppb (50) N/A 1.0 ppb (2) 1.0 ppb (1) 0.65 ppb (8) N/A 12.3 μg/m3 (52) 66.0
 
March 4, 2021, 2 a.m. 58.1 ppb (56) 5.9 ppb (6) 46.2 ppb (44) 52.0 ppb (50) N/A 1.0 ppb (2) 3.0 ppb (3) 0.51 ppb (6) N/A 10.4 μg/m3 (44) 56.0
 
March 4, 2021, 1 a.m. 72.4 ppb (71) 15.6 ppb (15) 61.1 ppb (59) 57.0 ppb (55) N/A 1.0 ppb (2) 2.0 ppb (2) 0.63 ppb (7) N/A 10.3 μg/m3 (43) 71.0
 
March 4, 2021, midnight 45.9 ppb (44) 2.4 ppb (3) 42.8 ppb (41) 44.0 ppb (42) N/A 0.0 ppb (0) 12.0 ppb (12) 0.63 ppb (7) N/A 11.8 μg/m3 (50) 50.0
 
March 3, 2021, 11 p.m. 18.4 ppb (18) 1.0 ppb (1) 16.3 ppb (16) 18.0 ppb (17) N/A 1.0 ppb (2) 39.0 ppb (37) 0.55 ppb (7) N/A 8.4 μg/m3 (36) 37.0
 
March 3, 2021, 10 p.m. 4.4 ppb (5) 0.8 ppb (1) 4.3 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 50.0 ppb (47) 0.21 ppb (3) N/A 6.9 μg/m3 (29) 47.0
 
March 3, 2021, 9 p.m. 6.5 ppb (7) 2.6 ppb (3) 6.2 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 49.0 ppb (46) 0.29 ppb (4) N/A 10.0 μg/m3 (42) 46.0
 
March 3, 2021, 8 p.m. 10.6 ppb (10) 4.9 ppb (5) 8.2 ppb (8) 6.0 ppb (6) N/A 0.0 ppb (0) 46.0 ppb (43) 0.28 ppb (4) N/A 8.6 μg/m3 (36) 43.0
 
March 3, 2021, 7 p.m. 8.9 ppb (9) 4.6 ppb (5) 7.6 ppb (8) 5.0 ppb (5) N/A 0.0 ppb (0) 45.0 ppb (42) 0.31 ppb (4) N/A 10.2 μg/m3 (43) 43.0
 
March 3, 2021, 6 p.m. 3.7 ppb (4) 1.4 ppb (2) 4.0 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 46.0 ppb (43) 0.28 ppb (4) N/A 7.8 μg/m3 (33) 43.0
 
March 3, 2021, 5 p.m. 5.6 ppb (6) 2.5 ppb (3) 5.0 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (40) 0.28 ppb (4) N/A 9.6 μg/m3 (40) 40.0
 
March 3, 2021, 4 p.m. 6.5 ppb (7) 3.0 ppb (3) 5.5 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 41.0 ppb (38) 0.23 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 3, 2021, 3 p.m. 10.5 ppb (10) 3.8 ppb (4) 8.9 ppb (9) 7.0 ppb (7) N/A 1.0 ppb (2) 37.0 ppb (35) 0.26 ppb (4) N/A 6.8 μg/m3 (29) 35.0
 
March 3, 2021, 2 p.m. 22.0 ppb (21) 6.6 ppb (7) 19.1 ppb (19) 16.0 ppb (16) N/A 2.0 ppb (3) 26.0 ppb (25) 0.37 ppb (5) N/A 1.9 μg/m3 (8) 25.0
 
March 3, 2021, 1 p.m. 50.5 ppb (48) 18.3 ppb (18) 37.8 ppb (36) 32.0 ppb (31) N/A 1.0 ppb (2) 9.0 ppb (9) 0.4 ppb (5) N/A 6.3 μg/m3 (27) 48.0
 
March 3, 2021, noon 44.0 ppb (42) 6.9 ppb (7) 31.3 ppb (30) 37.0 ppb (35) N/A 0.0 ppb (0) 3.0 ppb (3) 0.35 ppb (4) N/A 6.9 μg/m3 (29) 42.0
 
March 3, 2021, 11 a.m. 75.4 ppb (74) 30.1 ppb (29) 43.7 ppb (42) 47.0 ppb (45) N/A 0.0 ppb (0) 2.0 ppb (2) 0.34 ppb (4) N/A 6.3 μg/m3 (27) 74.0
 
March 3, 2021, 10 a.m. 49.7 ppb (47) 24.6 ppb (24) 47.4 ppb (45) 29.0 ppb (28) N/A 0.0 ppb (0) 7.0 ppb (7) 0.29 ppb (4) N/A 3.7 μg/m3 (16) 47.0
 
March 3, 2021, 9 a.m. 53.5 ppb (51) 22.7 ppb (22) 45.1 ppb (43) 32.0 ppb (31) N/A 0.0 ppb (0) 7.0 ppb (7) 0.28 ppb (4) N/A 8.0 μg/m3 (34) 51.0
 
March 3, 2021, 8 a.m. 50.1 ppb (48) 20.6 ppb (20) 35.5 ppb (34) 30.0 ppb (29) N/A 1.0 ppb (2) 10.0 ppb (10) 0.26 ppb (4) N/A 4.7 μg/m3 (20) 48.0
 
March 3, 2021, 7 a.m. 55.5 ppb (53) 23.3 ppb (22) 34.1 ppb (33) 33.0 ppb (32) N/A 1.0 ppb (2) 11.0 ppb (11) 0.28 ppb (4) N/A 5.7 μg/m3 (24) 53.0
 
March 3, 2021, 6 a.m. 62.1 ppb (60) 31.1 ppb (30) 35.9 ppb (34) 33.0 ppb (32) N/A 1.0 ppb (2) 14.0 ppb (13) 0.4 ppb (5) N/A 3.2 μg/m3 (14) 60.0
 
March 3, 2021, 5 a.m. 34.7 ppb (33) 16.5 ppb (16) 19.2 ppb (19) 22.0 ppb (21) N/A 1.0 ppb (2) 19.0 ppb (18) 0.26 ppb (4) N/A 4.9 μg/m3 (21) 33.0
 
March 3, 2021, 4 a.m. 21.6 ppb (21) 5.7 ppb (6) 13.5 ppb (13) 17.0 ppb (17) N/A 1.0 ppb (2) 23.0 ppb (22) 0.23 ppb (3) N/A 6.9 μg/m3 (29) 29.0
 
March 3, 2021, 3 a.m. 29.1 ppb (28) 11.3 ppb (11) 13.4 ppb (13) 21.0 ppb (20) N/A 1.0 ppb (2) 26.0 ppb (25) 0.26 ppb (4) N/A 8.3 μg/m3 (35) 35.0
 
March 3, 2021, 2 a.m. 13.4 ppb (13) 0.8 ppb (1) 10.9 ppb (11) 13.0 ppb (13) N/A 1.0 ppb (2) 30.0 ppb (28) 0.23 ppb (3) N/A 5.7 μg/m3 (24) 28.0
 
March 3, 2021, 1 a.m. 35.9 ppb (34) 6.3 ppb (6) 20.7 ppb (20) 30.0 ppb (29) N/A 1.0 ppb (2) 22.0 ppb (21) 0.34 ppb (4) N/A 8.1 μg/m3 (34) 34.0
 
March 3, 2021, midnight 61.5 ppb (59) 28.0 ppb (27) 26.0 ppb (25) 41.0 ppb (39) N/A 2.0 ppb (3) 18.0 ppb (17) 0.36 ppb (5) N/A 8.6 μg/m3 (36) 59.0
 
March 2, 2021, 11 p.m. 13.8 ppb (14) 2.5 ppb (3) 9.9 ppb (10) 12.0 ppb (12) N/A 0.0 ppb (0) 35.0 ppb (33) 0.21 ppb (3) N/A 2.1 μg/m3 (9) 33.0
 
March 2, 2021, 10 p.m. 11.0 ppb (11) 2.4 ppb (3) 10.3 ppb (10) 9.0 ppb (9) N/A 1.0 ppb (2) 38.0 ppb (36) 0.24 ppb (3) N/A 0.0 μg/m3 (0) 36.0
 
March 2, 2021, 9 p.m. 10.3 ppb (10) 2.9 ppb (3) 9.4 ppb (9) 8.0 ppb (8) N/A 1.0 ppb (2) 38.0 ppb (36) 0.2 ppb (3) N/A N/A 36.0
 
March 2, 2021, 8 p.m. 11.3 ppb (11) 3.8 ppb (4) 11.0 ppb (11) 8.0 ppb (8) N/A 1.0 ppb (2) 35.0 ppb (33) 0.21 ppb (3) N/A N/A 33.0
 
March 2, 2021, 7 p.m. 9.4 ppb (9) 3.7 ppb (4) 9.5 ppb (9) 6.0 ppb (6) N/A 1.0 ppb (2) 32.0 ppb (30) 0.2 ppb (3) N/A 7.4 μg/m3 (31) 31.0
 
March 2, 2021, 6 p.m. 11.1 ppb (11) 4.5 ppb (5) 10.7 ppb (11) 7.0 ppb (7) N/A 1.0 ppb (2) 29.0 ppb (27) 0.19 ppb (3) N/A 4.6 μg/m3 (20) 27.0
 
March 2, 2021, 5 p.m. 8.9 ppb (9) 3.5 ppb (4) 8.5 ppb (9) 6.0 ppb (6) N/A 3.0 ppb (5) 31.0 ppb (29) 0.21 ppb (3) N/A 3.5 μg/m3 (15) 29.0
 
March 2, 2021, 4 p.m. 8.3 ppb (8) 3.2 ppb (4) 8.1 ppb (8) 5.0 ppb (5) N/A 2.0 ppb (3) 30.0 ppb (28) 0.19 ppb (3) N/A 6.8 μg/m3 (29) 29.0
 
March 2, 2021, 3 p.m. 11.4 ppb (11) 4.4 ppb (5) 10.7 ppb (11) 7.0 ppb (7) N/A 1.0 ppb (2) 27.0 ppb (25) 0.19 ppb (3) N/A 6.9 μg/m3 (29) 29.0
 
March 2, 2021, 2 p.m. 28.0 ppb (27) 11.8 ppb (12) 24.0 ppb (23) 16.0 ppb (16) N/A 1.0 ppb (2) 19.0 ppb (18) 0.25 ppb (3) N/A 10.7 μg/m3 (45) 45.0
 
March 2, 2021, 1 p.m. 52.2 ppb (50) 23.3 ppb (22) 45.3 ppb (43) 29.0 ppb (28) N/A 0.0 ppb (0) 7.0 ppb (7) 0.28 ppb (4) N/A 11.3 μg/m3 (48) 50.0
 
March 2, 2021, noon 67.2 ppb (66) 31.5 ppb (30) 56.0 ppb (54) 36.0 ppb (34) N/A 0.0 ppb (0) 2.0 ppb (2) 0.31 ppb (4) N/A 13.9 μg/m3 (55) 66.0
 
March 2, 2021, 11 a.m. 45.8 ppb (44) 13.5 ppb (13) 37.3 ppb (36) 32.0 ppb (31) N/A 0.0 ppb (0) 3.0 ppb (3) 0.26 ppb (4) N/A 11.4 μg/m3 (48) 48.0
 
March 2, 2021, 10 a.m. 41.5 ppb (40) 9.3 ppb (9) 34.5 ppb (33) 32.0 ppb (31) N/A 0.0 ppb (0) 4.0 ppb (4) 0.22 ppb (3) N/A 7.5 μg/m3 (32) 40.0
 
March 2, 2021, 9 a.m. 26.5 ppb (25) 3.1 ppb (3) 21.0 ppb (20) 24.0 ppb (23) N/A 0.0 ppb (0) 10.0 ppb (10) 0.2 ppb (3) N/A 8.7 μg/m3 (37) 37.0
 
March 2, 2021, 8 a.m. 26.9 ppb (26) 3.4 ppb (4) 20.8 ppb (20) 24.0 ppb (23) N/A 0.0 ppb (0) 11.0 ppb (11) 0.19 ppb (3) N/A 7.4 μg/m3 (31) 31.0
 
March 2, 2021, 7 a.m. 15.1 ppb (15) 1.5 ppb (2) 12.0 ppb (12) 14.0 ppb (14) N/A 0.0 ppb (0) 20.0 ppb (19) 0.2 ppb (3) N/A 2.3 μg/m3 (10) 19.0
 
March 2, 2021, 6 a.m. 15.2 ppb (15) 1.8 ppb (2) 11.7 ppb (12) 13.0 ppb (13) N/A 0.0 ppb (0) 23.0 ppb (22) 0.19 ppb (3) N/A 4.2 μg/m3 (18) 22.0
 
March 2, 2021, 5 a.m. 15.8 ppb (15) 2.5 ppb (3) 12.0 ppb (12) 13.0 ppb (13) N/A 0.0 ppb (0) 22.0 ppb (21) 0.2 ppb (3) N/A 2.7 μg/m3 (12) 21.0
 
March 2, 2021, 4 a.m. 12.1 ppb (12) 2.2 ppb (3) 9.5 ppb (9) 10.0 ppb (10) N/A 1.0 ppb (2) 26.0 ppb (25) 0.22 ppb (3) N/A 4.4 μg/m3 (19) 25.0
 
March 2, 2021, 3 a.m. 23.9 ppb (23) 3.6 ppb (4) 19.4 ppb (19) 21.0 ppb (20) N/A 4.0 ppb (6) 18.0 ppb (17) 0.31 ppb (4) N/A 6.2 μg/m3 (26) 26.0
 
March 2, 2021, 2 a.m. 24.0 ppb (23) 3.4 ppb (4) 19.0 ppb (18) 21.0 ppb (20) N/A 2.0 ppb (3) 19.0 ppb (18) 0.25 ppb (3) N/A 4.0 μg/m3 (17) 23.0
 
March 2, 2021, 1 a.m. 40.3 ppb (39) 4.3 ppb (5) 31.8 ppb (30) 36.0 ppb (34) N/A 0.0 ppb (0) 8.0 ppb (8) 0.32 ppb (4) N/A 6.0 μg/m3 (25) 39.0
 
March 2, 2021, midnight 18.5 ppb (18) 1.3 ppb (2) 14.8 ppb (14) 17.0 ppb (17) N/A 0.0 ppb (0) 23.0 ppb (22) 0.29 ppb (4) N/A 5.5 μg/m3 (23) 23.0
 
March 1, 2021, 11 p.m. 6.4 ppb (7) 0.9 ppb (1) 5.4 ppb (6) 6.0 ppb (6) N/A 0.0 ppb (0) 35.0 ppb (33) 0.18 ppb (3) N/A 1.1 μg/m3 (5) 33.0
 
March 1, 2021, 10 p.m. 5.9 ppb (6) 1.9 ppb (2) 4.3 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (36) 0.17 ppb (3) N/A 4.8 μg/m3 (20) 36.0
 
March 1, 2021, 9 p.m. 8.1 ppb (8) 4.7 ppb (5) 6.7 ppb (7) 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (36) 0.21 ppb (3) N/A 0.6 μg/m3 (3) 36.0
 
March 1, 2021, 8 p.m. 6.0 ppb (6) 2.3 ppb (3) 4.4 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 39.0 ppb (37) 0.18 ppb (3) N/A 5.1 μg/m3 (22) 37.0
 
March 1, 2021, 7 p.m. 8.8 ppb (9) 3.6 ppb (4) 7.0 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 36.0 ppb (34) 0.23 ppb (3) N/A 0.3 μg/m3 (2) 34.0
 
March 1, 2021, 6 p.m. 8.6 ppb (9) 4.0 ppb (4) 7.6 ppb (8) 5.0 ppb (5) N/A 0.0 ppb (0) 35.0 ppb (33) 0.22 ppb (3) N/A 2.6 μg/m3 (11) 33.0
 
March 1, 2021, 5 p.m. 11.7 ppb (12) 5.9 ppb (6) 10.3 ppb (10) 6.0 ppb (6) N/A 0.0 ppb (0) 31.0 ppb (29) 0.25 ppb (3) N/A 9.1 μg/m3 (38) 38.0
 
March 1, 2021, 4 p.m. 15.5 ppb (15) 8.3 ppb (8) 13.2 ppb (13) 8.0 ppb (8) N/A 0.0 ppb (0) 27.0 ppb (25) 0.23 ppb (3) N/A 5.6 μg/m3 (24) 25.0
 
March 1, 2021, 3 p.m. 14.5 ppb (14) 6.2 ppb (6) 12.5 ppb (12) 8.0 ppb (8) N/A 0.0 ppb (0) 25.0 ppb (24) 0.27 ppb (4) N/A 5.9 μg/m3 (25) 25.0
 
March 1, 2021, 2 p.m. 15.8 ppb (15) 6.1 ppb (6) 13.0 ppb (13) 10.0 ppb (10) N/A 0.0 ppb (0) 22.0 ppb (21) 0.31 ppb (4) N/A 8.3 μg/m3 (35) 35.0
 
March 1, 2021, 1 p.m. 19.6 ppb (19) 4.6 ppb (5) 15.4 ppb (15) 15.0 ppb (15) N/A 0.0 ppb (0) 17.0 ppb (16) 0.25 ppb (3) N/A 11.2 μg/m3 (47) 47.0
 
March 1, 2021, noon 12.8 ppb (13) 2.3 ppb (3) 10.0 ppb (10) 11.0 ppb (11) N/A 0.0 ppb (0) 20.0 ppb (19) 0.2 ppb (3) N/A 3.7 μg/m3 (16) 19.0
 
March 1, 2021, 11 a.m. 6.6 ppb (7) 0.9 ppb (1) 5.3 ppb (5) 6.0 ppb (6) N/A 0.0 ppb (0) 25.0 ppb (24) 0.18 ppb (3) N/A -0.4 μg/m3 (0) 24.0
 
March 1, 2021, 10 a.m. 4.3 ppb (5) 0.4 ppb (1) 3.6 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 27.0 ppb (25) 0.17 ppb (3) N/A 5.4 μg/m3 (23) 25.0
 
March 1, 2021, 9 a.m. 4.0 ppb (4) 0.3 ppb (1) 3.4 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 28.0 ppb (26) 0.17 ppb (3) N/A 1.6 μg/m3 (7) 26.0
 
March 1, 2021, 8 a.m. 4.6 ppb (5) 0.3 ppb (1) 3.8 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 27.0 ppb (25) 0.17 ppb (3) N/A 5.8 μg/m3 (25) 25.0
 
March 1, 2021, 7 a.m. 2.4 ppb (3) 0.3 ppb (1) 2.2 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 31.0 ppb (29) 0.17 ppb (3) N/A 6.0 μg/m3 (25) 29.0
 
March 1, 2021, 6 a.m. 2.6 ppb (3) 0.3 ppb (1) 2.3 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 31.0 ppb (29) 0.17 ppb (3) N/A 6.3 μg/m3 (27) 29.0
 
March 1, 2021, 5 a.m. 3.2 ppb (4) 0.3 ppb (1) 2.8 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 30.0 ppb (28) 0.17 ppb (3) N/A 2.7 μg/m3 (12) 28.0
 
March 1, 2021, 4 a.m. 6.2 ppb (6) 0.4 ppb (1) 5.1 ppb (5) 6.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (27) 0.18 ppb (3) N/A 1.7 μg/m3 (8) 27.0
 
March 1, 2021, 3 a.m. 4.5 ppb (5) 0.3 ppb (1) 3.9 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 30.0 ppb (28) 0.19 ppb (3) N/A 2.4 μg/m3 (10) 28.0
 
March 1, 2021, 2 a.m. 3.8 ppb (4) 0.3 ppb (1) 3.6 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 29.0 ppb (27) 0.18 ppb (3) N/A 10.2 μg/m3 (43) 43.0
 
March 1, 2021, 1 a.m. 2.5 ppb (3) 0.5 ppb (1) 2.5 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (31) 0.17 ppb (3) N/A 2.6 μg/m3 (11) 31.0
 
March 1, 2021, midnight 2.5 ppb (3) 0.3 ppb (1) 2.5 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 34.0 ppb (32) 0.17 ppb (3) N/A -3.4 μg/m3 (0) 32.0
 
Feb. 28, 2021, 11 p.m. 7.3 ppb (7) 0.4 ppb (1) 6.4 ppb (7) 7.0 ppb (7) N/A 0.0 ppb (0) 28.0 ppb (26) 0.21 ppb (3) N/A 6.6 μg/m3 (28) 28.0
 
Feb. 28, 2021, 10 p.m. 5.5 ppb (6) 0.3 ppb (1) 5.4 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 24.0 ppb (23) 0.21 ppb (3) N/A 4.9 μg/m3 (21) 23.0
 
Feb. 28, 2021, 9 p.m. 5.6 ppb (6) 0.7 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 20.0 ppb (19) 0.22 ppb (3) N/A 7.3 μg/m3 (31) 31.0
 
Feb. 28, 2021, 8 p.m. 7.3 ppb (7) 1.3 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 14.0 ppb (13) 0.25 ppb (3) N/A 10.4 μg/m3 (44) 44.0
 
Feb. 28, 2021, 7 p.m. 8.3 ppb (8) 1.6 ppb (2) N/A 7.0 ppb (7) N/A 0.0 ppb (0) 13.0 ppb (13) 0.24 ppb (3) N/A 4.4 μg/m3 (19) 19.0
 
Feb. 28, 2021, 6 p.m. 3.4 ppb (4) 0.6 ppb (1) 3.3 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 18.0 ppb (17) 0.19 ppb (3) N/A 6.2 μg/m3 (26) 26.0
 
Feb. 28, 2021, 5 p.m. 6.6 ppb (7) 1.2 ppb (2) 6.1 ppb (6) 6.0 ppb (6) N/A 1.0 ppb (2) 15.0 ppb (14) 0.22 ppb (3) N/A 2.9 μg/m3 (13) 14.0
 
Feb. 28, 2021, 4 p.m. 12.5 ppb (12) 4.2 ppb (4) 10.9 ppb (11) 9.0 ppb (9) N/A 0.0 ppb (0) 11.0 ppb (11) 0.26 ppb (4) N/A 3.8 μg/m3 (16) 16.0
 
Feb. 28, 2021, 3 p.m. 22.0 ppb (21) 6.7 ppb (7) 19.0 ppb (18) 15.0 ppb (15) N/A N/A 7.0 ppb (7) 0.28 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 28, 2021, 2 p.m. 60.8 ppb (59) 39.0 ppb (37) 54.3 ppb (52) 22.0 ppb (21) N/A N/A 3.0 ppb (3) 0.41 ppb (5) N/A 7.9 μg/m3 (33) 59.0
 
Feb. 28, 2021, 1 p.m. 56.4 ppb (54) 30.7 ppb (29) 50.8 ppb (48) 26.0 ppb (25) N/A 0.0 ppb (0) 1.0 ppb (1) 0.36 ppb (5) N/A 8.0 μg/m3 (34) 54.0
 
Feb. 28, 2021, noon 33.8 ppb (32) 10.3 ppb (10) 25.3 ppb (24) 24.0 ppb (23) N/A 0.0 ppb (0) 2.0 ppb (2) 0.32 ppb (4) N/A 5.1 μg/m3 (22) 32.0
 
Feb. 28, 2021, 11 a.m. 21.8 ppb (21) 1.2 ppb (2) 16.7 ppb (16) 21.0 ppb (20) N/A 0.0 ppb (0) 5.0 ppb (5) N/A N/A 7.5 μg/m3 (32) 32.0
 
Feb. 28, 2021, 10 a.m. 13.1 ppb (13) 0.4 ppb (1) 10.3 ppb (10) 13.0 ppb (13) N/A 0.0 ppb (0) 12.0 ppb (12) N/A N/A 4.3 μg/m3 (18) 18.0
 
Feb. 28, 2021, 9 a.m. 9.9 ppb (10) 0.3 ppb (1) 7.7 ppb (8) 10.0 ppb (10) N/A 0.0 ppb (0) 15.0 ppb (14) 0.19 ppb (3) N/A 0.5 μg/m3 (3) 14.0
 
Feb. 28, 2021, 8 a.m. 7.8 ppb (8) 0.4 ppb (1) 6.2 ppb (6) 7.0 ppb (7) N/A 0.0 ppb (0) N/A 0.19 ppb (3) N/A 0.5 μg/m3 (3) 8.0
 
Feb. 28, 2021, 7 a.m. 6.9 ppb (7) 0.4 ppb (1) 5.6 ppb (6) 7.0 ppb (7) N/A 0.0 ppb (0) 17.0 ppb (16) 0.22 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 28, 2021, 6 a.m. 6.7 ppb (7) 0.6 ppb (1) 5.5 ppb (6) 6.0 ppb (6) N/A 0.0 ppb (0) 19.0 ppb (18) 0.21 ppb (3) N/A 5.5 μg/m3 (23) 23.0
 
Feb. 28, 2021, 5 a.m. 10.1 ppb (10) 1.0 ppb (1) 8.8 ppb (9) 9.0 ppb (9) N/A 0.0 ppb (0) 19.0 ppb (18) 0.27 ppb (4) N/A 6.9 μg/m3 (29) 29.0