ID: 972

AQSQID: 060376012

Site Name: Santa Clarita

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

Updated: July 28, 2021, 7:53 p.m.

Location: Newhall (Newhall), CA

Reporting: True, Located: True

Current AQI: 87.0

Newhall (Newhall) CA, US: 34.3833, -118.5283

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
July 28, 2021, 6 p.m. 12.9 ppb (13) 1.9 ppb (2) N/A 11.0 ppb (11) N/A N/A 66.0 ppb (87) 0.27 ppb (4) N/A 9.6 μg/m3 (40) 87.0
 
July 28, 2021, 5 p.m. 7.8 ppb (8) 1.1 ppb (2) N/A 7.0 ppb (7) N/A N/A 56.0 ppb (55) 0.23 ppb (3) N/A 10.9 μg/m3 (46) 55.0
 
July 28, 2021, 4 p.m. 16.2 ppb (16) 3.8 ppb (4) N/A 12.0 ppb (12) N/A N/A 39.0 ppb (37) 0.31 ppb (4) N/A 12.4 μg/m3 (52) 52.0
 
July 28, 2021, 3 p.m. 26.2 ppb (25) 8.6 ppb (9) N/A 18.0 ppb (17) N/A N/A 21.0 ppb (20) 0.37 ppb (5) N/A 13.4 μg/m3 (54) 54.0
 
July 28, 2021, 2 p.m. 29.4 ppb (28) 10.5 ppb (10) N/A 19.0 ppb (18) N/A N/A 11.0 ppb (11) 0.37 ppb (5) N/A 18.2 μg/m3 (64) 64.0
 
July 28, 2021, 1 p.m. 22.8 ppb (22) 6.1 ppb (6) N/A 17.0 ppb (17) N/A N/A 6.0 ppb (6) 0.39 ppb (5) N/A 10.2 μg/m3 (43) 43.0
 
July 28, 2021, noon 20.9 ppb (20) 1.7 ppb (2) N/A 19.0 ppb (18) N/A N/A 4.0 ppb (4) 0.35 ppb (4) N/A 9.4 μg/m3 (40) 40.0
 
July 28, 2021, 11 a.m. 16.4 ppb (16) 0.5 ppb (1) N/A 16.0 ppb (16) N/A N/A 9.0 ppb (9) 0.31 ppb (4) N/A 7.9 μg/m3 (33) 33.0
 
July 28, 2021, 10 a.m. 18.3 ppb (18) 0.7 ppb (1) N/A 18.0 ppb (17) N/A N/A 9.0 ppb (9) 0.32 ppb (4) N/A 8.9 μg/m3 (38) 38.0
 
July 28, 2021, 9 a.m. 16.9 ppb (16) 1.2 ppb (2) N/A 16.0 ppb (16) N/A N/A 9.0 ppb (9) 0.32 ppb (4) N/A 11.9 μg/m3 (50) 50.0
 
July 28, 2021, 8 a.m. 17.6 ppb (17) 0.6 ppb (1) N/A 17.0 ppb (17) N/A N/A 10.0 ppb (10) 0.37 ppb (5) N/A 12.1 μg/m3 (51) 51.0
 
July 28, 2021, 7 a.m. 16.8 ppb (16) 0.5 ppb (1) N/A 16.0 ppb (16) N/A N/A 13.0 ppb (13) 0.34 ppb (4) N/A 8.4 μg/m3 (36) 36.0
 
July 28, 2021, 6 a.m. 7.5 ppb (8) 0.3 ppb (1) N/A 7.0 ppb (7) N/A N/A 28.0 ppb (26) 0.19 ppb (3) N/A 4.0 μg/m3 (17) 26.0
 
July 28, 2021, 5 a.m. 6.4 ppb (7) 0.3 ppb (1) N/A 6.0 ppb (6) N/A N/A 35.0 ppb (33) 0.17 ppb (3) N/A 6.9 μg/m3 (29) 33.0
 
July 28, 2021, 4 a.m. 11.4 ppb (11) 0.4 ppb (1) N/A 11.0 ppb (11) N/A N/A 33.0 ppb (31) 0.22 ppb (3) N/A 10.6 μg/m3 (45) 45.0
 
July 28, 2021, 3 a.m. 16.7 ppb (16) 0.3 ppb (1) N/A 16.0 ppb (16) N/A N/A 33.0 ppb (31) 0.3 ppb (4) N/A 14.8 μg/m3 (57) 57.0
 
July 28, 2021, 2 a.m. 9.0 ppb (9) 0.4 ppb (1) N/A 9.0 ppb (9) N/A N/A 46.0 ppb (43) 0.22 ppb (3) N/A 4.8 μg/m3 (20) 43.0
 
July 28, 2021, 1 a.m. 7.8 ppb (8) 0.7 ppb (1) N/A 7.0 ppb (7) N/A N/A 52.0 ppb (49) 0.23 ppb (3) N/A 7.2 μg/m3 (31) 49.0
 
July 28, 2021, midnight 6.1 ppb (6) 0.7 ppb (1) N/A 5.0 ppb (5) N/A N/A 60.0 ppb (68) 0.2 ppb (3) N/A 6.4 μg/m3 (27) 68.0
 
July 27, 2021, 11 p.m. 5.7 ppb (6) 0.6 ppb (1) N/A 5.0 ppb (5) N/A N/A 62.0 ppb (74) 0.18 ppb (3) N/A 4.7 μg/m3 (20) 74.0
 
July 27, 2021, 10 p.m. 4.8 ppb (5) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A 62.0 ppb (74) 0.17 ppb (3) N/A 8.9 μg/m3 (38) 74.0
 
July 27, 2021, 9 p.m. 4.7 ppb (5) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A 66.0 ppb (87) 0.16 ppb (3) N/A 11.4 μg/m3 (48) 87.0
 
July 27, 2021, 8 p.m. 6.4 ppb (7) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A 70.0 ppb (100) 0.19 ppb (3) N/A 10.6 μg/m3 (45) 100.0
 
July 27, 2021, 7 p.m. 8.0 ppb (8) 1.0 ppb (1) N/A 7.0 ppb (7) N/A N/A 72.0 ppb (102) 0.21 ppb (3) N/A 11.1 μg/m3 (47) 102.0
 
July 27, 2021, 6 p.m. 12.4 ppb (12) 1.9 ppb (2) N/A 11.0 ppb (11) N/A N/A 64.0 ppb (81) 0.26 ppb (4) N/A 15.3 μg/m3 (58) 81.0
 
July 27, 2021, 5 p.m. 12.6 ppb (12) 2.1 ppb (2) N/A 10.0 ppb (10) N/A N/A 59.0 ppb (65) 0.26 ppb (4) N/A 4.8 μg/m3 (20) 65.0
 
July 27, 2021, 4 p.m. 11.7 ppb (12) 1.9 ppb (2) N/A 10.0 ppb (10) N/A N/A 51.0 ppb (48) 0.28 ppb (4) N/A 17.3 μg/m3 (62) 62.0
 
July 27, 2021, 3 p.m. 11.7 ppb (12) 2.5 ppb (3) N/A 9.0 ppb (9) N/A N/A 33.0 ppb (31) 0.26 ppb (4) N/A 14.6 μg/m3 (57) 57.0
 
July 27, 2021, 2 p.m. 17.6 ppb (17) 5.3 ppb (5) N/A 12.0 ppb (12) N/A N/A 15.0 ppb (14) 0.22 ppb (3) N/A 15.6 μg/m3 (59) 59.0
 
July 27, 2021, 1 p.m. 20.8 ppb (20) 6.4 ppb (7) N/A 14.0 ppb (14) N/A N/A 4.0 ppb (4) 0.33 ppb (4) N/A 12.4 μg/m3 (52) 52.0
 
July 27, 2021, noon 13.8 ppb (14) 1.5 ppb (2) N/A 12.0 ppb (12) N/A N/A 6.0 ppb (6) 0.21 ppb (3) N/A 12.9 μg/m3 (53) 53.0
 
July 27, 2021, 11 a.m. 14.1 ppb (14) 1.2 ppb (2) N/A 13.0 ppb (13) N/A N/A 6.0 ppb (6) 0.21 ppb (3) N/A 12.6 μg/m3 (53) 53.0
 
July 27, 2021, 10 a.m. 14.8 ppb (14) 1.2 ppb (2) N/A 14.0 ppb (14) N/A N/A 7.0 ppb (7) 0.22 ppb (3) N/A 18.7 μg/m3 (65) 65.0
 
July 27, 2021, 9 a.m. 6.0 ppb (6) 0.5 ppb (1) N/A 6.0 ppb (6) N/A N/A 20.0 ppb (19) 0.11 ppb (2) N/A 9.2 μg/m3 (39) 39.0
 
July 27, 2021, 8 a.m. 5.8 ppb (6) 0.4 ppb (1) N/A 5.0 ppb (5) N/A N/A 25.0 ppb (24) 0.11 ppb (2) N/A 7.7 μg/m3 (33) 33.0
 
July 27, 2021, 7 a.m. 7.2 ppb (7) 0.4 ppb (1) N/A 7.0 ppb (7) N/A N/A 27.0 ppb (25) 0.11 ppb (2) N/A 16.3 μg/m3 (60) 60.0
 
July 27, 2021, 6 a.m. 11.1 ppb (11) 0.5 ppb (1) N/A 11.0 ppb (11) N/A N/A 40.0 ppb (38) 0.18 ppb (3) N/A 14.8 μg/m3 (57) 57.0
 
July 27, 2021, 5 a.m. 11.4 ppb (11) 0.6 ppb (1) N/A 11.0 ppb (11) N/A N/A 38.0 ppb (36) 0.19 ppb (3) N/A 15.6 μg/m3 (59) 59.0
 
July 27, 2021, 4 a.m. 10.8 ppb (11) 0.4 ppb (1) N/A 10.0 ppb (10) N/A N/A 42.0 ppb (39) 0.2 ppb (3) N/A 17.8 μg/m3 (63) 63.0
 
July 27, 2021, 3 a.m. 11.1 ppb (11) 0.4 ppb (1) N/A 11.0 ppb (11) N/A N/A 49.0 ppb (46) 0.23 ppb (3) N/A 13.1 μg/m3 (54) 54.0
 
July 27, 2021, 2 a.m. 13.2 ppb (13) 0.8 ppb (1) N/A 12.0 ppb (12) N/A N/A 53.0 ppb (50) 0.25 ppb (3) N/A 18.5 μg/m3 (65) 65.0
 
July 27, 2021, 1 a.m. 12.8 ppb (13) 1.1 ppb (2) N/A 12.0 ppb (12) N/A N/A 59.0 ppb (65) 0.29 ppb (4) N/A 17.0 μg/m3 (62) 65.0
 
July 27, 2021, midnight 13.7 ppb (13) 1.3 ppb (2) N/A 12.0 ppb (12) N/A N/A 59.0 ppb (65) 0.31 ppb (4) N/A 21.4 μg/m3 (71) 71.0
 
July 26, 2021, 11 p.m. 14.0 ppb (14) 1.7 ppb (2) N/A 12.0 ppb (12) N/A N/A 56.0 ppb (55) 0.31 ppb (4) N/A 17.5 μg/m3 (63) 63.0
 
July 26, 2021, 10 p.m. 12.3 ppb (12) 1.5 ppb (2) N/A 11.0 ppb (11) N/A N/A 57.0 ppb (58) 0.28 ppb (4) N/A 18.7 μg/m3 (65) 65.0
 
July 26, 2021, 9 p.m. 11.6 ppb (11) 1.7 ppb (2) N/A 10.0 ppb (10) N/A N/A 55.0 ppb (51) 0.26 ppb (4) N/A 17.6 μg/m3 (63) 63.0
 
July 26, 2021, 8 p.m. 10.6 ppb (10) 1.3 ppb (2) N/A 9.0 ppb (9) N/A N/A 58.0 ppb (61) 0.22 ppb (3) N/A 11.9 μg/m3 (50) 61.0
 
July 26, 2021, 7 p.m. 6.5 ppb (7) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A 61.0 ppb (71) 0.19 ppb (3) N/A 12.9 μg/m3 (53) 71.0
 
July 26, 2021, 6 p.m. 7.6 ppb (8) 1.4 ppb (2) N/A 6.0 ppb (6) N/A N/A 51.0 ppb (48) 0.19 ppb (3) N/A 11.2 μg/m3 (47) 48.0
 
July 26, 2021, 5 p.m. 13.0 ppb (13) 2.3 ppb (3) N/A 11.0 ppb (11) N/A N/A 36.0 ppb (34) 0.25 ppb (3) N/A 16.8 μg/m3 (61) 61.0
 
July 26, 2021, 4 p.m. 17.7 ppb (17) 3.4 ppb (4) N/A 14.0 ppb (14) N/A N/A 26.0 ppb (25) 0.3 ppb (4) N/A 15.3 μg/m3 (58) 58.0
 
July 26, 2021, 3 p.m. 22.7 ppb (22) 7.2 ppb (7) N/A 15.0 ppb (15) N/A N/A 18.0 ppb (17) 0.33 ppb (4) N/A 14.9 μg/m3 (57) 57.0
 
July 26, 2021, 2 p.m. 27.3 ppb (26) 6.4 ppb (7) N/A 21.0 ppb (20) N/A N/A 10.0 ppb (10) 0.39 ppb (5) N/A 11.4 μg/m3 (48) 48.0
 
July 26, 2021, 1 p.m. 18.4 ppb (18) 1.4 ppb (2) N/A 17.0 ppb (17) N/A N/A 15.0 ppb (14) 0.28 ppb (4) N/A 14.6 μg/m3 (57) 57.0
 
July 26, 2021, noon 14.1 ppb (14) 0.9 ppb (1) N/A 13.0 ppb (13) N/A N/A 19.0 ppb (18) 0.23 ppb (3) N/A 16.6 μg/m3 (61) 61.0
 
July 26, 2021, 11 a.m. 11.9 ppb (12) 0.4 ppb (1) N/A 12.0 ppb (12) N/A N/A 19.0 ppb (18) 0.28 ppb (4) N/A 10.2 μg/m3 (43) 43.0
 
July 26, 2021, 10 a.m. 11.3 ppb (11) 0.4 ppb (1) N/A 11.0 ppb (11) N/A N/A 21.0 ppb (20) 0.29 ppb (4) N/A 11.4 μg/m3 (48) 48.0
 
July 26, 2021, 9 a.m. 3.4 ppb (4) 0.2 ppb (1) N/A 3.0 ppb (3) N/A N/A 33.0 ppb (31) 0.14 ppb (2) N/A 11.1 μg/m3 (47) 47.0
 
July 26, 2021, 8 a.m. 4.1 ppb (4) 0.3 ppb (1) N/A 4.0 ppb (4) N/A N/A 33.0 ppb (31) 0.16 ppb (3) N/A 8.2 μg/m3 (35) 35.0
 
July 26, 2021, 7 a.m. 4.6 ppb (5) 0.2 ppb (1) N/A 4.0 ppb (4) N/A N/A 33.0 ppb (31) 0.15 ppb (2) N/A 7.7 μg/m3 (33) 33.0
 
July 26, 2021, 6 a.m. 9.7 ppb (10) 0.3 ppb (1) N/A 9.0 ppb (9) N/A N/A 31.0 ppb (29) 0.28 ppb (4) N/A 21.2 μg/m3 (71) 71.0
 
July 26, 2021, 5 a.m. 11.0 ppb (11) 0.4 ppb (1) N/A 11.0 ppb (11) N/A N/A 34.0 ppb (32) 0.28 ppb (4) N/A 18.7 μg/m3 (65) 65.0
 
July 26, 2021, 4 a.m. 7.2 ppb (7) 0.4 ppb (1) N/A 7.0 ppb (7) N/A N/A 41.0 ppb (38) 0.2 ppb (3) N/A 10.2 μg/m3 (43) 43.0
 
July 26, 2021, 3 a.m. 6.8 ppb (7) 0.3 ppb (1) N/A 7.0 ppb (7) N/A N/A 48.0 ppb (45) 0.21 ppb (3) N/A 10.7 μg/m3 (45) 45.0
 
July 26, 2021, 2 a.m. 12.2 ppb (12) 1.3 ppb (2) N/A 11.0 ppb (11) N/A N/A 46.0 ppb (43) 0.21 ppb (3) N/A 7.4 μg/m3 (31) 43.0
 
July 26, 2021, 1 a.m. 6.5 ppb (7) 0.9 ppb (1) N/A 6.0 ppb (6) N/A N/A 56.0 ppb (55) 0.16 ppb (3) N/A 7.0 μg/m3 (30) 55.0
 
July 26, 2021, midnight 4.7 ppb (5) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A 61.0 ppb (71) 0.15 ppb (2) N/A 15.3 μg/m3 (58) 71.0
 
July 25, 2021, 11 p.m. 5.3 ppb (5) 0.7 ppb (1) N/A 5.0 ppb (5) N/A N/A 69.0 ppb (97) 0.17 ppb (3) N/A 7.6 μg/m3 (32) 97.0
 
July 25, 2021, 10 p.m. 6.5 ppb (7) 0.9 ppb (1) N/A 6.0 ppb (6) N/A N/A 72.0 ppb (102) 0.18 ppb (3) N/A 17.6 μg/m3 (63) 102.0
 
July 25, 2021, 9 p.m. 5.9 ppb (6) 0.7 ppb (1) N/A 5.0 ppb (5) N/A N/A 76.0 ppb (104) 0.2 ppb (3) N/A 18.5 μg/m3 (65) 104.0
 
July 25, 2021, 8 p.m. 6.8 ppb (7) 0.9 ppb (1) N/A 6.0 ppb (6) N/A N/A 73.0 ppb (103) 0.23 ppb (3) N/A 20.5 μg/m3 (69) 103.0
 
July 25, 2021, 7 p.m. 6.1 ppb (6) 0.7 ppb (1) N/A 5.0 ppb (5) N/A N/A 70.0 ppb (100) 0.24 ppb (3) N/A 16.6 μg/m3 (61) 100.0
 
July 25, 2021, 6 p.m. 7.4 ppb (7) 1.2 ppb (2) N/A 6.0 ppb (6) N/A N/A 60.0 ppb (68) 0.25 ppb (3) N/A 20.5 μg/m3 (69) 69.0
 
July 25, 2021, 5 p.m. 8.6 ppb (9) 1.8 ppb (2) N/A 7.0 ppb (7) N/A N/A 49.0 ppb (46) 0.25 ppb (3) N/A 11.2 μg/m3 (47) 47.0
 
July 25, 2021, 4 p.m. 7.7 ppb (8) 1.7 ppb (2) N/A 6.0 ppb (6) N/A N/A 41.0 ppb (38) 0.23 ppb (3) N/A 14.9 μg/m3 (57) 57.0
 
July 25, 2021, 3 p.m. 7.2 ppb (7) 1.8 ppb (2) N/A 5.0 ppb (5) N/A N/A 34.0 ppb (32) 0.2 ppb (3) N/A 6.7 μg/m3 (28) 32.0
 
July 25, 2021, 2 p.m. 5.8 ppb (6) 1.2 ppb (2) N/A 5.0 ppb (5) N/A N/A 26.0 ppb (25) 0.23 ppb (3) N/A 17.8 μg/m3 (63) 63.0
 
July 25, 2021, 1 p.m. 4.4 ppb (5) 0.5 ppb (1) N/A 4.0 ppb (4) N/A N/A 24.0 ppb (23) 0.14 ppb (2) N/A 12.1 μg/m3 (51) 51.0
 
July 25, 2021, noon 4.8 ppb (5) 0.4 ppb (1) N/A 4.0 ppb (4) N/A N/A 22.0 ppb (21) 0.15 ppb (2) N/A 9.4 μg/m3 (40) 40.0
 
July 25, 2021, 11 a.m. 4.2 ppb (4) 0.4 ppb (1) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (24) 0.13 ppb (2) N/A 8.4 μg/m3 (36) 36.0
 
July 25, 2021, 10 a.m. 5.2 ppb (5) 0.5 ppb (1) N/A 5.0 ppb (5) N/A N/A 26.0 ppb (25) 0.16 ppb (3) N/A 8.2 μg/m3 (35) 35.0
 
July 25, 2021, 9 a.m. 4.1 ppb (4) 0.3 ppb (1) N/A 4.0 ppb (4) N/A N/A 29.0 ppb (27) 0.14 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
July 25, 2021, 8 a.m. 4.5 ppb (5) 0.3 ppb (1) N/A 4.0 ppb (4) N/A N/A 30.0 ppb (28) 0.15 ppb (2) N/A 14.9 μg/m3 (57) 57.0
 
July 25, 2021, 7 a.m. 7.7 ppb (8) 0.3 ppb (1) N/A 7.0 ppb (7) N/A N/A 29.0 ppb (27) 0.19 ppb (3) N/A 13.9 μg/m3 (55) 55.0
 
July 25, 2021, 6 a.m. 10.2 ppb (10) 0.4 ppb (1) N/A 10.0 ppb (10) N/A N/A 32.0 ppb (30) 0.28 ppb (4) N/A 16.1 μg/m3 (60) 60.0
 
July 25, 2021, 5 a.m. 13.4 ppb (13) 0.4 ppb (1) N/A 13.0 ppb (13) N/A N/A 32.0 ppb (30) 0.31 ppb (4) N/A 22.2 μg/m3 (73) 73.0
 
July 25, 2021, 4 a.m. 9.7 ppb (10) 0.3 ppb (1) N/A 9.0 ppb (9) N/A N/A 43.0 ppb (40) 0.28 ppb (4) N/A 19.7 μg/m3 (67) 67.0
 
July 25, 2021, 3 a.m. 8.7 ppb (9) 0.3 ppb (1) N/A 8.0 ppb (8) N/A N/A 52.0 ppb (49) 0.26 ppb (4) N/A 22.2 μg/m3 (73) 73.0
 
July 25, 2021, 2 a.m. 11.6 ppb (11) 0.8 ppb (1) N/A 11.0 ppb (11) N/A N/A 55.0 ppb (51) 0.26 ppb (4) N/A 7.0 μg/m3 (30) 51.0
 
July 25, 2021, 1 a.m. 5.9 ppb (6) 0.7 ppb (1) N/A 5.0 ppb (5) N/A N/A 61.0 ppb (71) 0.19 ppb (3) N/A 10.9 μg/m3 (46) 71.0
 
July 25, 2021, midnight 7.1 ppb (7) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A 70.0 ppb (100) 0.22 ppb (3) N/A 13.9 μg/m3 (55) 100.0
 
July 24, 2021, 11 p.m. 5.1 ppb (5) 0.5 ppb (1) N/A 5.0 ppb (5) N/A N/A 70.0 ppb (100) 0.19 ppb (3) N/A 15.9 μg/m3 (59) 100.0
 
July 24, 2021, 10 p.m. 6.1 ppb (6) 0.7 ppb (1) N/A 5.0 ppb (5) N/A N/A 79.0 ppb (106) 0.22 ppb (3) N/A 18.7 μg/m3 (65) 106.0
 
July 24, 2021, 9 p.m. 8.1 ppb (8) 0.9 ppb (1) N/A 7.0 ppb (7) N/A N/A 78.0 ppb (105) 0.26 ppb (4) N/A 23.4 μg/m3 (75) 105.0
 
July 24, 2021, 8 p.m. 8.1 ppb (8) 0.9 ppb (1) N/A 7.0 ppb (7) N/A N/A 80.0 ppb (106) 0.28 ppb (4) N/A 23.1 μg/m3 (75) 106.0
 
July 24, 2021, 7 p.m. 9.7 ppb (10) 1.6 ppb (2) N/A 8.0 ppb (8) N/A N/A 67.0 ppb (91) 0.28 ppb (4) N/A 18.7 μg/m3 (65) 91.0
 
July 24, 2021, 6 p.m. 9.7 ppb (10) 1.6 ppb (2) N/A 8.0 ppb (8) N/A N/A 55.0 ppb (51) 0.28 ppb (4) N/A 21.9 μg/m3 (72) 72.0
 
July 24, 2021, 5 p.m. 14.8 ppb (14) 3.7 ppb (4) N/A 11.0 ppb (11) N/A N/A 44.0 ppb (41) 0.27 ppb (4) N/A 18.7 μg/m3 (65) 65.0
 
July 24, 2021, 4 p.m. 16.3 ppb (16) 4.1 ppb (4) N/A 12.0 ppb (12) N/A N/A 31.0 ppb (29) 0.34 ppb (4) N/A 20.5 μg/m3 (69) 69.0
 
July 24, 2021, 3 p.m. 21.6 ppb (21) 7.0 ppb (7) N/A 15.0 ppb (15) N/A N/A 21.0 ppb (20) 0.37 ppb (5) N/A 14.8 μg/m3 (57) 57.0
 
July 24, 2021, 2 p.m. 16.7 ppb (16) 5.4 ppb (6) N/A 11.0 ppb (11) N/A N/A 14.0 ppb (13) 0.33 ppb (4) N/A 20.2 μg/m3 (69) 69.0
 
July 24, 2021, 1 p.m. 17.7 ppb (17) 3.0 ppb (3) N/A 15.0 ppb (15) N/A N/A 4.0 ppb (4) 0.31 ppb (4) N/A 18.0 μg/m3 (64) 64.0
 
July 24, 2021, noon 9.2 ppb (9) 0.8 ppb (1) N/A 8.0 ppb (8) N/A N/A 10.0 ppb (10) 0.19 ppb (3) N/A 11.4 μg/m3 (48) 48.0
 
July 24, 2021, 11 a.m. 6.8 ppb (7) 0.5 ppb (1) N/A 6.0 ppb (6) N/A N/A 15.0 ppb (14) 0.13 ppb (2) N/A 10.7 μg/m3 (45) 45.0
 
July 24, 2021, 10 a.m. 7.1 ppb (7) 0.5 ppb (1) N/A 7.0 ppb (7) N/A N/A 18.0 ppb (17) 0.14 ppb (2) N/A 8.9 μg/m3 (38) 38.0
 
July 24, 2021, 9 a.m. 11.1 ppb (11) 0.5 ppb (1) N/A 11.0 ppb (11) N/A N/A 20.0 ppb (19) 0.25 ppb (3) N/A 31.9 μg/m3 (93) 93.0
 
July 24, 2021, 8 a.m. 14.0 ppb (14) 0.5 ppb (1) N/A 13.0 ppb (13) N/A N/A 20.0 ppb (19) 0.31 ppb (4) N/A 19.5 μg/m3 (67) 67.0
 
July 24, 2021, 7 a.m. 8.4 ppb (8) 0.4 ppb (1) N/A 8.0 ppb (8) N/A N/A 24.0 ppb (23) 0.2 ppb (3) N/A 11.6 μg/m3 (49) 49.0
 
July 24, 2021, 6 a.m. 6.5 ppb (7) 0.4 ppb (1) N/A 6.0 ppb (6) N/A N/A 28.0 ppb (26) 0.15 ppb (2) N/A 10.4 μg/m3 (44) 44.0
 
July 24, 2021, 5 a.m. 6.6 ppb (7) 0.2 ppb (1) N/A 6.0 ppb (6) N/A N/A 34.0 ppb (32) 0.16 ppb (3) N/A 13.1 μg/m3 (54) 54.0
 
July 24, 2021, 4 a.m. 9.2 ppb (9) 0.3 ppb (1) N/A 9.0 ppb (9) N/A N/A 39.0 ppb (37) 0.21 ppb (3) N/A 13.1 μg/m3 (54) 54.0
 
July 24, 2021, 3 a.m. 11.2 ppb (11) 0.8 ppb (1) N/A 10.0 ppb (10) N/A N/A 46.0 ppb (43) 0.23 ppb (3) N/A 13.4 μg/m3 (54) 54.0
 
July 24, 2021, 2 a.m. 7.4 ppb (7) 0.4 ppb (1) N/A 7.0 ppb (7) N/A N/A 56.0 ppb (55) 0.19 ppb (3) N/A 14.4 μg/m3 (56) 56.0
 
July 24, 2021, 1 a.m. 6.0 ppb (6) 0.6 ppb (1) N/A 5.0 ppb (5) N/A N/A 59.0 ppb (65) 0.18 ppb (3) N/A 15.1 μg/m3 (58) 65.0
 
July 24, 2021, midnight 5.6 ppb (6) 0.6 ppb (1) N/A 5.0 ppb (5) N/A N/A 65.0 ppb (84) 0.18 ppb (3) N/A 11.4 μg/m3 (48) 84.0
 
July 23, 2021, 11 p.m. 5.1 ppb (5) 0.5 ppb (1) N/A 5.0 ppb (5) N/A N/A 69.0 ppb (97) 0.17 ppb (3) N/A 11.9 μg/m3 (50) 97.0
 
July 23, 2021, 10 p.m. 5.7 ppb (6) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A 70.0 ppb (100) 0.17 ppb (3) N/A 21.2 μg/m3 (71) 100.0
 
July 23, 2021, 9 p.m. 6.3 ppb (6) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A 75.0 ppb (104) 0.21 ppb (3) N/A 24.1 μg/m3 (77) 104.0
 
July 23, 2021, 8 p.m. 7.9 ppb (8) 1.0 ppb (1) N/A 7.0 ppb (7) N/A N/A 69.0 ppb (97) 0.23 ppb (3) N/A 22.7 μg/m3 (74) 97.0
 
July 23, 2021, 7 p.m. 10.0 ppb (10) 1.6 ppb (2) N/A 8.0 ppb (8) N/A N/A 60.0 ppb (68) 0.24 ppb (3) N/A 21.4 μg/m3 (71) 71.0
 
July 23, 2021, 6 p.m. 11.6 ppb (11) 2.4 ppb (3) N/A 9.0 ppb (9) N/A N/A 51.0 ppb (48) 0.24 ppb (3) N/A 19.2 μg/m3 (66) 66.0
 
July 23, 2021, 5 p.m. 15.2 ppb (15) 3.5 ppb (4) N/A 12.0 ppb (12) N/A N/A 42.0 ppb (39) 0.3 ppb (4) N/A 17.3 μg/m3 (62) 62.0
 
July 23, 2021, 4 p.m. 15.0 ppb (15) 3.4 ppb (4) N/A 12.0 ppb (12) N/A N/A 40.0 ppb (38) 0.28 ppb (4) N/A 24.6 μg/m3 (78) 78.0
 
July 23, 2021, 3 p.m. 28.9 ppb (28) 9.5 ppb (9) N/A 20.0 ppb (19) N/A N/A 22.0 ppb (21) 0.41 ppb (5) N/A 23.8 μg/m3 (76) 76.0
 
July 23, 2021, 2 p.m. 29.5 ppb (28) 9.6 ppb (10) N/A 20.0 ppb (19) N/A N/A 11.0 ppb (11) 0.4 ppb (5) N/A 16.8 μg/m3 (61) 61.0
 
July 23, 2021, 1 p.m. 20.9 ppb (20) 3.9 ppb (4) N/A 17.0 ppb (17) N/A N/A 6.0 ppb (6) 0.33 ppb (4) N/A 12.1 μg/m3 (51) 51.0
 
July 23, 2021, noon 22.6 ppb (22) 3.4 ppb (4) N/A 19.0 ppb (18) N/A N/A 3.0 ppb (3) 0.32 ppb (4) N/A 11.6 μg/m3 (49) 49.0
 
July 23, 2021, 11 a.m. 19.4 ppb (19) 1.3 ppb (2) N/A 18.0 ppb (17) N/A N/A 5.0 ppb (5) 0.27 ppb (4) N/A 12.9 μg/m3 (53) 53.0
 
July 23, 2021, 10 a.m. 20.5 ppb (20) 1.5 ppb (2) N/A 19.0 ppb (18) N/A N/A 5.0 ppb (5) 0.28 ppb (4) N/A 16.1 μg/m3 (60) 60.0
 
July 23, 2021, 9 a.m. 19.7 ppb (19) 1.2 ppb (2) N/A 19.0 ppb (18) N/A N/A 8.0 ppb (8) 0.26 ppb (4) N/A 19.0 μg/m3 (66) 66.0
 
July 23, 2021, 8 a.m. 19.6 ppb (19) 1.0 ppb (1) N/A 19.0 ppb (18) N/A N/A 10.0 ppb (10) 0.29 ppb (4) N/A 17.8 μg/m3 (63) 63.0
 
July 23, 2021, 7 a.m. 16.2 ppb (16) 0.7 ppb (1) N/A 16.0 ppb (16) N/A N/A 15.0 ppb (14) 0.28 ppb (4) N/A 14.6 μg/m3 (57) 57.0
 
July 23, 2021, 6 a.m. 13.8 ppb (14) 0.6 ppb (1) N/A 13.0 ppb (13) N/A N/A 20.0 ppb (19) 0.25 ppb (3) N/A 18.1 μg/m3 (64) 64.0
 
July 23, 2021, 5 a.m. 11.9 ppb (12) 0.5 ppb (1) N/A 11.0 ppb (11) N/A N/A 25.0 ppb (24) 0.21 ppb (3) N/A 16.8 μg/m3 (61) 61.0
 
July 23, 2021, 4 a.m. 11.2 ppb (11) 0.4 ppb (1) N/A 11.0 ppb (11) N/A N/A 30.0 ppb (28) 0.23 ppb (3) N/A 18.1 μg/m3 (64) 64.0
 
July 23, 2021, 3 a.m. 8.2 ppb (8) 0.3 ppb (1) N/A 8.0 ppb (8) N/A N/A 38.0 ppb (36) 0.2 ppb (3) N/A 13.4 μg/m3 (54) 54.0
 
July 23, 2021, 2 a.m. 9.5 ppb (9) 0.9 ppb (1) N/A 9.0 ppb (9) N/A N/A 44.0 ppb (41) 0.21 ppb (3) N/A 15.4 μg/m3 (58) 58.0
 
July 23, 2021, 1 a.m. 8.2 ppb (8) 0.9 ppb (1) N/A 7.0 ppb (7) N/A N/A 50.0 ppb (47) 0.22 ppb (3) N/A 14.6 μg/m3 (57) 57.0
 
July 23, 2021, midnight 7.4 ppb (7) 0.9 ppb (1) N/A 7.0 ppb (7) N/A N/A 55.0 ppb (51) 0.2 ppb (3) N/A 16.4 μg/m3 (61) 61.0
 
July 22, 2021, 11 p.m. 6.0 ppb (6) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A 67.0 ppb (91) 0.2 ppb (3) N/A 16.6 μg/m3 (61) 91.0
 
July 22, 2021, 10 p.m. 5.1 ppb (5) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A 61.0 ppb (71) 0.18 ppb (3) N/A 14.8 μg/m3 (57) 71.0
 
July 22, 2021, 9 p.m. 5.9 ppb (6) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A 62.0 ppb (74) 0.18 ppb (3) N/A 13.9 μg/m3 (55) 74.0
 
July 22, 2021, 8 p.m. 7.4 ppb (7) 0.9 ppb (1) N/A 6.0 ppb (6) N/A N/A 66.0 ppb (87) 0.22 ppb (3) N/A 13.6 μg/m3 (55) 87.0
 
July 22, 2021, 7 p.m. 10.7 ppb (11) 1.5 ppb (2) N/A 9.0 ppb (9) N/A N/A 67.0 ppb (91) 0.29 ppb (4) N/A 19.7 μg/m3 (67) 91.0
 
July 22, 2021, 6 p.m. 12.0 ppb (12) 2.1 ppb (2) N/A 10.0 ppb (10) N/A N/A 59.0 ppb (65) 0.28 ppb (4) N/A 17.8 μg/m3 (63) 65.0
 
July 22, 2021, 5 p.m. 18.2 ppb (18) 4.1 ppb (4) N/A 14.0 ppb (14) N/A N/A 46.0 ppb (43) 0.32 ppb (4) N/A 13.3 μg/m3 (54) 54.0
 
July 22, 2021, 4 p.m. 22.7 ppb (22) 5.5 ppb (6) N/A 17.0 ppb (17) N/A N/A 37.0 ppb (35) 0.39 ppb (5) N/A 17.5 μg/m3 (63) 63.0
 
July 22, 2021, 3 p.m. 20.1 ppb (19) 5.5 ppb (6) N/A 15.0 ppb (15) N/A N/A 27.0 ppb (25) 0.34 ppb (4) N/A 16.3 μg/m3 (60) 60.0
 
July 22, 2021, 2 p.m. 35.5 ppb (34) 12.4 ppb (12) N/A 23.0 ppb (22) N/A N/A 12.0 ppb (12) 0.44 ppb (5) N/A 17.3 μg/m3 (62) 62.0
 
July 22, 2021, 1 p.m. 20.3 ppb (20) 3.5 ppb (4) N/A 17.0 ppb (17) N/A N/A 7.0 ppb (7) 0.37 ppb (5) N/A 18.5 μg/m3 (65) 65.0
 
July 22, 2021, noon 17.8 ppb (17) 0.9 ppb (1) N/A 17.0 ppb (17) N/A N/A 8.0 ppb (8) 0.35 ppb (4) N/A 18.7 μg/m3 (65) 65.0
 
July 22, 2021, 11 a.m. 15.1 ppb (15) 1.6 ppb (2) N/A 13.0 ppb (13) N/A N/A 17.0 ppb (16) 0.3 ppb (4) N/A 10.7 μg/m3 (45) 45.0
 
July 22, 2021, 10 a.m. 12.3 ppb (12) 0.3 ppb (1) N/A 12.0 ppb (12) N/A N/A 25.0 ppb (24) 0.27 ppb (4) N/A 15.9 μg/m3 (59) 59.0
 
July 22, 2021, 9 a.m. 9.9 ppb (10) 0.3 ppb (1) N/A 10.0 ppb (10) N/A N/A 31.0 ppb (29) 0.22 ppb (3) N/A 14.9 μg/m3 (57) 57.0
 
July 22, 2021, 8 a.m. 8.8 ppb (9) 0.2 ppb (1) N/A 9.0 ppb (9) N/A N/A 34.0 ppb (32) 0.21 ppb (3) N/A 9.9 μg/m3 (42) 42.0
 
July 22, 2021, 7 a.m. 10.5 ppb (10) 0.2 ppb (1) N/A 10.0 ppb (10) N/A N/A 35.0 ppb (33) 0.21 ppb (3) N/A 12.9 μg/m3 (53) 53.0
 
July 22, 2021, 6 a.m. 21.7 ppb (21) 0.4 ppb (1) N/A 21.0 ppb (20) N/A N/A 20.0 ppb (19) 0.38 ppb (5) N/A 17.1 μg/m3 (62) 62.0
 
July 22, 2021, 5 a.m. 16.3 ppb (16) 0.3 ppb (1) N/A 16.0 ppb (16) N/A N/A 25.0 ppb (24) 0.3 ppb (4) N/A 15.6 μg/m3 (59) 59.0
 
July 22, 2021, 4 a.m. 12.7 ppb (12) 0.2 ppb (1) N/A 13.0 ppb (13) N/A N/A 32.0 ppb (30) 0.27 ppb (4) N/A 15.1 μg/m3 (58) 58.0
 
July 22, 2021, 3 a.m. 13.1 ppb (13) 0.3 ppb (1) N/A 13.0 ppb (13) N/A N/A 35.0 ppb (33) 0.3 ppb (4) N/A 14.1 μg/m3 (56) 56.0
 
July 22, 2021, 2 a.m. 8.5 ppb (9) 0.5 ppb (1) N/A 8.0 ppb (8) N/A N/A 47.0 ppb (44) 0.22 ppb (3) N/A 11.6 μg/m3 (49) 49.0
 
July 22, 2021, 1 a.m. 3.4 ppb (4) 0.4 ppb (1) N/A 3.0 ppb (3) N/A N/A 49.0 ppb (46) 0.15 ppb (2) N/A 11.2 μg/m3 (47) 47.0
 
July 22, 2021, midnight 5.3 ppb (5) 0.5 ppb (1) N/A 5.0 ppb (5) N/A N/A 69.0 ppb (97) 0.21 ppb (3) N/A 12.6 μg/m3 (53) 97.0
 
July 21, 2021, 11 p.m. 6.2 ppb (6) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A 82.0 ppb (107) 0.23 ppb (3) N/A 19.2 μg/m3 (66) 107.0
 
July 21, 2021, 10 p.m. 6.3 ppb (6) 0.5 ppb (1) N/A 6.0 ppb (6) N/A N/A 95.0 ppb (114) 0.25 ppb (3) N/A 14.8 μg/m3 (57) 114.0
 
July 21, 2021, 9 p.m. 7.2 ppb (7) 0.6 ppb (1) N/A 7.0 ppb (7) N/A N/A 91.0 ppb (112) 0.26 ppb (4) N/A 12.9 μg/m3 (53) 112.0
 
July 21, 2021, 8 p.m. 8.8 ppb (9) 0.9 ppb (1) N/A 8.0 ppb (8) N/A N/A 84.0 ppb (108) 0.27 ppb (4) N/A 12.6 μg/m3 (53) 108.0
 
July 21, 2021, 7 p.m. 10.6 ppb (10) 1.3 ppb (2) N/A 9.0 ppb (9) N/A N/A 74.0 ppb (103) 0.28 ppb (4) N/A 18.5 μg/m3 (65) 103.0