AQSQID: 060811001

Site Name: Redwood City

Location: San Mateo Co, CA

Reporting: True, Located: True

Current AQI: 17.0

San Mateo Co CA, US: 37.4828, -122.2022

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
July 22, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
July 22, 2019, 10 a.m. 7.1 ppb (7) 0.2 ppb (0) N/A 7.0 ppb (6) N/A N/A 18.0 ppb (14) 0.25 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
July 22, 2019, 9 a.m. 13.2 ppb (12) 0.3 ppb (0) N/A 13.0 ppb (12) N/A N/A 13.0 ppb (10) 0.26 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
July 22, 2019, 8 a.m. 15.2 ppb (14) 0.3 ppb (0) N/A 15.0 ppb (14) N/A N/A 12.0 ppb (9) 0.34 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
July 22, 2019, 7 a.m. 15.9 ppb (15) 0.3 ppb (0) N/A 16.0 ppb (15) N/A N/A 12.0 ppb (9) 0.34 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
July 22, 2019, 6 a.m. 12.4 ppb (11) 0.3 ppb (0) N/A 12.0 ppb (11) N/A N/A 16.0 ppb (12) 0.28 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 22, 2019, 5 a.m. 6.2 ppb (6) 0.3 ppb (0) N/A 6.0 ppb (6) N/A N/A 23.0 ppb (18) 0.26 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
July 22, 2019, 4 a.m. 3.8 ppb (4) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A 25.0 ppb (19) 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
July 22, 2019, 3 a.m. 4.0 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A 26.0 ppb (20) 0.27 ppb (3) N/A 4.0 μg/m3 (17) 20.0
 
July 22, 2019, 2 a.m. 5.3 ppb (5) 0.8 ppb (1) N/A 5.0 ppb (5) N/A N/A 27.0 ppb (21) 0.26 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
July 22, 2019, 1 a.m. 4.3 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 28.0 ppb (22) 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
July 22, 2019, midnight 3.7 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 29.0 ppb (22) 0.28 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 21, 2019, 11 p.m. 3.2 ppb (3) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A 30.0 ppb (23) 0.26 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
July 21, 2019, 10 p.m. 3.7 ppb (3) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 31.0 ppb (24) 0.29 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 21, 2019, 9 p.m. 4.4 ppb (4) 0.9 ppb (1) N/A 4.0 ppb (4) N/A N/A 34.0 ppb (26) 0.29 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
July 21, 2019, 8 p.m. 5.4 ppb (5) 1.2 ppb (1) N/A 4.0 ppb (4) N/A N/A 33.0 ppb (25) 0.29 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
July 21, 2019, 7 p.m. 3.7 ppb (3) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 31.0 ppb (24) 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
July 21, 2019, 6 p.m. 3.7 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) 0.27 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
July 21, 2019, 5 p.m. 3.7 ppb (3) 1.3 ppb (1) N/A 2.0 ppb (2) N/A N/A 22.0 ppb (17) 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
July 21, 2019, 4 p.m. 3.5 ppb (3) 1.3 ppb (1) N/A 2.0 ppb (2) N/A N/A 18.0 ppb (14) 0.24 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
July 21, 2019, 3 p.m. 5.0 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A N/A 14.0 ppb (11) 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 21, 2019, 2 p.m. 4.8 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 13.0 ppb (10) 0.24 ppb (3) N/A 24.0 μg/m3 (76) 76.0
 
July 21, 2019, 1 p.m. 3.7 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A 12.0 ppb (9) 0.24 ppb (3) N/A -3.0 μg/m3 (0) 9.0
 
July 21, 2019, noon 4.5 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A 15.0 ppb (12) 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 21, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
July 21, 2019, 10 a.m. 2.5 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A 18.0 ppb (14) 0.23 ppb (3) N/A 1.0 μg/m3 (4) 14.0
 
July 21, 2019, 9 a.m. 2.5 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 17.0 ppb (13) 0.24 ppb (3) N/A 0.0 μg/m3 (0) 13.0
 
July 21, 2019, 8 a.m. 3.4 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A 15.0 ppb (12) 0.25 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
July 21, 2019, 7 a.m. 7.4 ppb (7) 0.3 ppb (0) N/A 7.0 ppb (6) N/A N/A 10.0 ppb (8) 0.26 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
July 21, 2019, 6 a.m. 6.9 ppb (6) 0.4 ppb (0) N/A 7.0 ppb (6) N/A N/A 13.0 ppb (10) 0.24 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
July 21, 2019, 5 a.m. 5.0 ppb (5) 0.4 ppb (0) N/A 5.0 ppb (5) N/A N/A 16.0 ppb (12) 0.24 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
July 21, 2019, 4 a.m. 4.2 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A 18.0 ppb (14) 0.24 ppb (3) N/A 1.0 μg/m3 (4) 14.0
 
July 21, 2019, 3 a.m. 3.8 ppb (4) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A 19.0 ppb (15) 0.26 ppb (3) N/A 0.0 μg/m3 (0) 15.0
 
July 21, 2019, 2 a.m. 3.0 ppb (3) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A 22.0 ppb (17) 0.27 ppb (3) N/A 2.0 μg/m3 (8) 17.0
 
July 21, 2019, 1 a.m. 3.5 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 23.0 ppb (18) 0.25 ppb (3) N/A 3.0 μg/m3 (12) 18.0
 
July 21, 2019, midnight 4.5 ppb (4) 1.5 ppb (1) N/A 3.0 ppb (3) N/A N/A 24.0 ppb (18) 0.25 ppb (3) N/A 4.0 μg/m3 (17) 18.0
 
July 20, 2019, 11 p.m. 4.9 ppb (5) 1.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 25.0 ppb (19) 0.25 ppb (3) N/A 3.0 μg/m3 (12) 19.0
 
July 20, 2019, 10 p.m. 2.5 ppb (2) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A 27.0 ppb (21) 0.25 ppb (3) N/A 2.0 μg/m3 (8) 21.0
 
July 20, 2019, 9 p.m. 2.9 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A 30.0 ppb (23) 0.25 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
July 20, 2019, 8 p.m. 3.2 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A 34.0 ppb (26) 0.24 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 20, 2019, 7 p.m. 2.5 ppb (2) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A 31.0 ppb (24) 0.23 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 20, 2019, 6 p.m. 3.3 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 26.0 ppb (20) 0.24 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
July 20, 2019, 5 p.m. 4.1 ppb (4) 1.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 22.0 ppb (17) 0.26 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
July 20, 2019, 4 p.m. 3.9 ppb (4) 1.5 ppb (1) N/A 2.0 ppb (2) N/A N/A 18.0 ppb (14) 0.25 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
July 20, 2019, 3 p.m. 3.2 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A 17.0 ppb (13) 0.24 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
July 20, 2019, 2 p.m. 4.0 ppb (4) 1.1 ppb (1) N/A 3.0 ppb (3) N/A N/A 14.0 ppb (11) 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 20, 2019, 1 p.m. 3.9 ppb (4) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A 14.0 ppb (11) 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 20, 2019, noon 2.0 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A 16.0 ppb (12) 0.23 ppb (3) N/A 2.0 μg/m3 (8) 12.0
 
July 20, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.0 μg/m3 (0) N/A
July 20, 2019, 10 a.m. 1.7 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A 17.0 ppb (13) 0.22 ppb (2) N/A 2.0 μg/m3 (8) 13.0
 
July 20, 2019, 9 a.m. 2.2 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A 16.0 ppb (12) 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 20, 2019, 8 a.m. 2.9 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A 14.0 ppb (11) 0.24 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
July 20, 2019, 7 a.m. 4.5 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A 15.0 ppb (12) 0.23 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
July 20, 2019, 6 a.m. 4.5 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A 16.0 ppb (12) 0.23 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
July 20, 2019, 5 a.m. 2.5 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 19.0 ppb (15) 0.23 ppb (3) N/A 2.0 μg/m3 (8) 15.0
 
July 20, 2019, 4 a.m. 1.8 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 20.0 ppb (15) 0.22 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
July 20, 2019, 3 a.m. 4.0 ppb (4) 0.5 ppb (0) N/A 4.0 ppb (4) N/A N/A 18.0 ppb (14) 0.26 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 20, 2019, 2 a.m. 4.1 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 20.0 ppb (15) 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
July 20, 2019, 1 a.m. 3.9 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A 23.0 ppb (18) 0.26 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
July 20, 2019, midnight 4.6 ppb (4) 1.4 ppb (1) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) 0.3 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
July 19, 2019, 11 p.m. 4.9 ppb (5) 1.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 28.0 ppb (22) 0.29 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
July 19, 2019, 10 p.m. 4.8 ppb (4) 1.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 29.0 ppb (22) 0.29 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
July 19, 2019, 9 p.m. 4.4 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A 30.0 ppb (23) 0.28 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 19, 2019, 8 p.m. 4.7 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A N/A 30.0 ppb (23) 0.28 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
July 19, 2019, 7 p.m. 5.0 ppb (5) 1.3 ppb (1) N/A 4.0 ppb (4) N/A N/A 28.0 ppb (22) 0.28 ppb (3) N/A 5.0 μg/m3 (21) 22.0
 
July 19, 2019, 6 p.m. 5.2 ppb (5) 1.9 ppb (2) N/A 3.0 ppb (3) N/A N/A 21.0 ppb (16) 0.26 ppb (3) N/A 2.0 μg/m3 (8) 16.0
 
July 19, 2019, 5 p.m. 5.3 ppb (5) 2.3 ppb (2) N/A 3.0 ppb (3) N/A N/A 16.0 ppb (12) 0.26 ppb (3) N/A 0.0 μg/m3 (0) 12.0
 
July 19, 2019, 4 p.m. 6.3 ppb (6) 3.3 ppb (3) N/A 3.0 ppb (3) N/A N/A 11.0 ppb (8) 0.3 ppb (3) N/A 1.0 μg/m3 (4) 8.0
 
July 19, 2019, 3 p.m. 8.0 ppb (7) 4.7 ppb (4) N/A 3.0 ppb (3) N/A N/A 9.0 ppb (7) 0.28 ppb (3) N/A 1.0 μg/m3 (4) 7.0
 
July 19, 2019, 2 p.m. 6.3 ppb (6) 3.9 ppb (4) N/A 2.0 ppb (2) N/A N/A 5.0 ppb (4) 0.29 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
July 19, 2019, 1 p.m. 8.0 ppb (7) 4.6 ppb (4) N/A 3.0 ppb (3) N/A N/A 4.0 ppb (3) 0.29 ppb (3) N/A 1.0 μg/m3 (4) 7.0
 
July 19, 2019, noon 4.7 ppb (4) 0.9 ppb (1) N/A 4.0 ppb (4) N/A N/A 4.0 ppb (3) 0.29 ppb (3) N/A -1.0 μg/m3 (0) 4.0
 
July 19, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
July 19, 2019, 10 a.m. 3.0 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A 13.0 ppb (10) 0.24 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
July 19, 2019, 9 a.m. 8.2 ppb (8) 4.4 ppb (4) N/A 4.0 ppb (4) N/A N/A 12.0 ppb (9) 0.24 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
July 19, 2019, 8 a.m. 4.4 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A 11.0 ppb (8) 0.24 ppb (3) N/A 0.0 μg/m3 (0) 8.0
 
July 19, 2019, 7 a.m. 3.0 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A 13.0 ppb (10) 0.23 ppb (3) N/A -1.0 μg/m3 (0) 10.0
 
July 19, 2019, 6 a.m. 2.9 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A 11.0 ppb (8) 0.23 ppb (3) N/A -1.0 μg/m3 (0) 8.0
 
July 19, 2019, 5 a.m. 3.3 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A N/A 10.0 ppb (8) 0.22 ppb (2) N/A 0.0 μg/m3 (0) 8.0
 
July 19, 2019, 4 a.m. 6.6 ppb (6) 1.7 ppb (2) N/A 5.0 ppb (5) N/A N/A 9.0 ppb (7) 0.24 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
July 19, 2019, 3 a.m. 6.0 ppb (6) 1.5 ppb (1) N/A 5.0 ppb (5) N/A N/A 9.0 ppb (7) 0.23 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
July 19, 2019, 2 a.m. 3.8 ppb (4) 1.5 ppb (1) N/A 2.0 ppb (2) N/A N/A 10.0 ppb (8) 0.25 ppb (3) N/A -1.0 μg/m3 (0) 8.0
 
July 19, 2019, 1 a.m. 2.1 ppb (2) 0.9 ppb (1) N/A 1.0 ppb (1) N/A N/A 12.0 ppb (9) 0.22 ppb (2) N/A -1.0 μg/m3 (0) 9.0
 
July 19, 2019, midnight 2.1 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 13.0 ppb (10) 0.21 ppb (2) N/A 1.0 μg/m3 (4) 10.0
 
July 18, 2019, 11 p.m. 3.5 ppb (3) 1.7 ppb (2) N/A 2.0 ppb (2) N/A N/A 14.0 ppb (11) 0.26 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
July 18, 2019, 10 p.m. 5.9 ppb (5) 3.1 ppb (3) N/A 3.0 ppb (3) N/A N/A 13.0 ppb (10) 0.27 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
July 18, 2019, 9 p.m. 5.8 ppb (5) 2.8 ppb (3) N/A 3.0 ppb (3) N/A N/A 14.0 ppb (11) 0.25 ppb (3) N/A 2.0 μg/m3 (8) 11.0
 
July 18, 2019, 8 p.m. 6.1 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A 16.0 ppb (12) 0.26 ppb (3) N/A 2.0 μg/m3 (8) 12.0
 
July 18, 2019, 7 p.m. 6.8 ppb (6) 3.1 ppb (3) N/A 4.0 ppb (4) N/A N/A 19.0 ppb (15) 0.27 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
July 18, 2019, 6 p.m. 8.2 ppb (8) 3.7 ppb (3) N/A 5.0 ppb (5) N/A N/A 20.0 ppb (15) 0.28 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 18, 2019, 5 p.m. 9.5 ppb (9) 4.2 ppb (4) N/A 5.0 ppb (5) N/A N/A 18.0 ppb (14) 0.28 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
July 18, 2019, 4 p.m. 9.1 ppb (8) 4.2 ppb (4) N/A 5.0 ppb (5) N/A N/A 16.0 ppb (12) 0.29 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 18, 2019, 3 p.m. 10.0 ppb (9) 4.9 ppb (5) N/A 5.0 ppb (5) N/A N/A 13.0 ppb (10) 0.29 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
July 18, 2019, 2 p.m. 14.3 ppb (13) 7.0 ppb (6) N/A 7.0 ppb (6) N/A N/A 9.0 ppb (7) 0.35 ppb (4) N/A 3.0 μg/m3 (12) 13.0
 
July 18, 2019, 1 p.m. 13.2 ppb (12) 4.1 ppb (4) N/A 9.0 ppb (8) N/A N/A 4.0 ppb (3) 0.38 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
July 18, 2019, noon 9.7 ppb (9) 1.6 ppb (1) N/A 8.0 ppb (7) N/A N/A 3.0 ppb (2) 0.39 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
July 18, 2019, 11 a.m. 6.9 ppb (6) 0.6 ppb (1) N/A 6.0 ppb (6) N/A N/A 5.0 ppb (4) 0.3 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
July 18, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
July 18, 2019, 9 a.m. 8.0 ppb (7) 0.2 ppb (0) N/A 8.0 ppb (7) N/A N/A 7.0 ppb (5) 0.29 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
July 18, 2019, 8 a.m. 8.3 ppb (8) 0.3 ppb (0) N/A 8.0 ppb (7) N/A N/A 9.0 ppb (7) 0.29 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
July 18, 2019, 7 a.m. 7.8 ppb (7) 0.3 ppb (0) N/A 8.0 ppb (7) N/A N/A 13.0 ppb (10) 0.29 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
July 18, 2019, 6 a.m. 12.0 ppb (11) 0.6 ppb (1) N/A 11.0 ppb (10) N/A N/A 12.0 ppb (9) 0.31 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
July 18, 2019, 5 a.m. 13.8 ppb (13) 0.9 ppb (1) N/A 13.0 ppb (12) N/A N/A 12.0 ppb (9) 0.32 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
July 18, 2019, 4 a.m. 11.3 ppb (10) 0.8 ppb (1) N/A 11.0 ppb (10) N/A N/A 16.0 ppb (12) 0.29 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
July 18, 2019, 3 a.m. 8.3 ppb (8) 0.8 ppb (1) N/A 8.0 ppb (7) N/A N/A 20.0 ppb (15) 0.29 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
July 18, 2019, 2 a.m. 6.1 ppb (6) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A 30.0 ppb (23) 0.33 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
July 18, 2019, 1 a.m. 5.4 ppb (5) 1.3 ppb (1) N/A 4.0 ppb (4) N/A N/A 32.0 ppb (25) 0.33 ppb (4) N/A 5.0 μg/m3 (21) 25.0
 
July 18, 2019, midnight 6.7 ppb (6) 1.7 ppb (2) N/A 5.0 ppb (5) N/A N/A 35.0 ppb (27) 0.35 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
July 17, 2019, 11 p.m. 11.5 ppb (11) 3.3 ppb (3) N/A 8.0 ppb (7) N/A N/A 28.0 ppb (22) 0.33 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
July 17, 2019, 10 p.m. 7.6 ppb (7) 1.9 ppb (2) N/A 6.0 ppb (6) N/A N/A 37.0 ppb (28) 0.33 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
July 17, 2019, 9 p.m. 11.0 ppb (10) 2.7 ppb (3) N/A 8.0 ppb (7) N/A N/A 38.0 ppb (29) 0.32 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
July 17, 2019, 8 p.m. 8.8 ppb (8) 2.1 ppb (2) N/A 7.0 ppb (6) N/A N/A 36.0 ppb (28) 0.32 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
July 17, 2019, 7 p.m. 8.7 ppb (8) 2.4 ppb (2) N/A 6.0 ppb (6) N/A N/A 32.0 ppb (25) 0.33 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
July 17, 2019, 6 p.m. 11.8 ppb (11) 4.5 ppb (4) N/A 7.0 ppb (6) N/A N/A 26.0 ppb (20) 0.31 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 17, 2019, 5 p.m. 11.1 ppb (10) 4.6 ppb (4) N/A 7.0 ppb (6) N/A N/A 21.0 ppb (16) 0.3 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
July 17, 2019, 4 p.m. 12.1 ppb (11) 5.6 ppb (5) N/A 6.0 ppb (6) N/A N/A 17.0 ppb (13) 0.33 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
July 17, 2019, 3 p.m. 11.4 ppb (11) 5.5 ppb (5) N/A 6.0 ppb (6) N/A N/A 14.0 ppb (11) 0.33 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
July 17, 2019, 2 p.m. 11.8 ppb (11) 5.0 ppb (5) N/A 7.0 ppb (6) N/A N/A 10.0 ppb (8) 0.38 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
July 17, 2019, 1 p.m. 13.8 ppb (13) 4.0 ppb (4) N/A 10.0 ppb (9) N/A N/A 5.0 ppb (4) 0.37 ppb (4) N/A 16.0 μg/m3 (59) 59.0
 
July 17, 2019, noon 8.9 ppb (8) 0.8 ppb (1) N/A 8.0 ppb (7) N/A N/A 7.0 ppb (5) 0.28 ppb (3) N/A 1.0 μg/m3 (4) 8.0
 
July 17, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
July 17, 2019, 10 a.m. 3.9 ppb (4) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A 12.0 ppb (9) 0.23 ppb (3) N/A 1.0 μg/m3 (4) 9.0
 
July 17, 2019, 9 a.m. 4.7 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A 12.0 ppb (9) 0.25 ppb (3) N/A -4.0 μg/m3 (0) 9.0
 
July 17, 2019, 8 a.m. 3.9 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A 15.0 ppb (12) 0.24 ppb (3) N/A 2.0 μg/m3 (8) 12.0
 
July 17, 2019, 7 a.m. 5.6 ppb (5) 0.4 ppb (0) N/A 5.0 ppb (5) N/A N/A 15.0 ppb (12) 0.26 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
July 17, 2019, 6 a.m. 4.0 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A 19.0 ppb (15) 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
July 17, 2019, 5 a.m. 4.3 ppb (4) 0.5 ppb (0) N/A 4.0 ppb (4) N/A N/A 19.0 ppb (15) 0.25 ppb (3) N/A 3.0 μg/m3 (12) 15.0
 
July 17, 2019, 4 a.m. 4.2 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 21.0 ppb (16) 0.24 ppb (3) N/A 3.0 μg/m3 (12) 16.0
 
July 17, 2019, 3 a.m. 2.4 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A 24.0 ppb (18) 0.27 ppb (3) N/A 2.0 μg/m3 (8) 18.0
 
July 17, 2019, 2 a.m. 1.7 ppb (2) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A 25.0 ppb (19) 0.22 ppb (2) N/A 3.0 μg/m3 (12) 19.0
 
July 17, 2019, 1 a.m. 2.1 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A 26.0 ppb (20) 0.21 ppb (2) N/A 3.0 μg/m3 (12) 20.0
 
July 17, 2019, midnight 2.5 ppb (2) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A 26.0 ppb (20) 0.22 ppb (2) N/A 4.0 μg/m3 (17) 20.0
 
July 16, 2019, 11 p.m. 3.2 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A N/A 28.0 ppb (22) 0.24 ppb (3) N/A 5.0 μg/m3 (21) 22.0
 
July 16, 2019, 10 p.m. 4.0 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A N/A 28.0 ppb (22) 0.24 ppb (3) N/A 2.0 μg/m3 (8) 22.0
 
July 16, 2019, 9 p.m. 3.4 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A N/A 26.0 ppb (20) 0.23 ppb (3) N/A 3.0 μg/m3 (12) 20.0
 
July 16, 2019, 8 p.m. 9.8 ppb (9) 4.1 ppb (4) N/A 6.0 ppb (6) N/A N/A 20.0 ppb (15) 0.29 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
July 16, 2019, 7 p.m. 13.6 ppb (13) 6.9 ppb (6) N/A 7.0 ppb (6) N/A N/A 17.0 ppb (13) 0.27 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 16, 2019, 6 p.m. 13.2 ppb (12) 7.1 ppb (7) N/A 6.0 ppb (6) N/A N/A 15.0 ppb (12) 0.28 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
July 16, 2019, 5 p.m. 10.9 ppb (10) 6.2 ppb (6) N/A 5.0 ppb (5) N/A N/A 14.0 ppb (11) 0.29 ppb (3) N/A 1.0 μg/m3 (4) 11.0
 
July 16, 2019, 4 p.m. 8.5 ppb (8) 4.3 ppb (4) N/A 4.0 ppb (4) N/A N/A 12.0 ppb (9) 0.31 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
July 16, 2019, 3 p.m. 9.2 ppb (9) 4.9 ppb (5) N/A 4.0 ppb (4) N/A N/A 10.0 ppb (8) 0.28 ppb (3) N/A N/A 9.0
 
July 16, 2019, 2 p.m. 7.0 ppb (6) 3.3 ppb (3) N/A 4.0 ppb (4) N/A N/A 9.0 ppb (7) 0.3 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
July 16, 2019, 1 p.m. 13.2 ppb (12) 5.3 ppb (5) N/A 8.0 ppb (7) N/A N/A 4.0 ppb (3) 0.35 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
July 16, 2019, noon 6.3 ppb (6) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A 6.0 ppb (5) 0.3 ppb (3) N/A 1.0 μg/m3 (4) 6.0
 
July 16, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -2.0 μg/m3 (0) N/A
July 16, 2019, 10 a.m. 4.8 ppb (4) 0.3 ppb (0) N/A 5.0 ppb (5) N/A N/A 7.0 ppb (5) 0.23 ppb (3) N/A 0.0 μg/m3 (0) 5.0
 
July 16, 2019, 9 a.m. 2.6 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A 10.0 ppb (8) 0.22 ppb (2) N/A -1.0 μg/m3 (0) 8.0
 
July 16, 2019, 8 a.m. 2.8 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 11.0 ppb (8) 0.22 ppb (2) N/A 1.0 μg/m3 (4) 8.0
 
July 16, 2019, 7 a.m. 4.3 ppb (4) 0.8 ppb (1) N/A 4.0 ppb (4) N/A N/A 11.0 ppb (8) 0.21 ppb (2) N/A 0.0 μg/m3 (0) 8.0
 
July 16, 2019, 6 a.m. 2.7 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A 13.0 ppb (10) 0.22 ppb (2) N/A -1.0 μg/m3 (0) 10.0
 
July 16, 2019, 5 a.m. 2.4 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A 14.0 ppb (11) 0.21 ppb (2) N/A 0.0 μg/m3 (0) 11.0
 
July 16, 2019, 4 a.m. 2.4 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A 14.0 ppb (11) 0.23 ppb (3) N/A -1.0 μg/m3 (0) 11.0
 
July 16, 2019, 3 a.m. 2.3 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A 14.0 ppb (11) 0.23 ppb (3) N/A 0.0 μg/m3 (0) 11.0
 
July 16, 2019, 2 a.m. 2.6 ppb (2) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A 14.0 ppb (11) 0.28 ppb (3) N/A 0.0 μg/m3 (0) 11.0
 
July 16, 2019, 1 a.m. 2.5 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 16.0 ppb (12) 0.27 ppb (3) N/A 1.0 μg/m3 (4) 12.0
 
July 16, 2019, midnight 2.5 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 17.0 ppb (13) 0.24 ppb (3) N/A 0.0 μg/m3 (0) 13.0
 
July 15, 2019, 11 p.m. 2.4 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 17.0 ppb (13) 0.24 ppb (3) N/A -1.0 μg/m3 (0) 13.0
 
July 15, 2019, 10 p.m. 3.0 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A N/A 18.0 ppb (14) 0.25 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
July 15, 2019, 9 p.m. 3.2 ppb (3) 1.2 ppb (1) N/A 2.0 ppb (2) N/A N/A 22.0 ppb (17) 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
July 15, 2019, 8 p.m. 3.1 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A N/A 22.0 ppb (17) 0.23 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
July 15, 2019, 7 p.m. 8.2 ppb (8) 3.3 ppb (3) N/A 5.0 ppb (5) N/A N/A 22.0 ppb (17) 0.27 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
July 15, 2019, 6 p.m. 12.9 ppb (12) 5.3 ppb (5) N/A 8.0 ppb (7) N/A N/A 22.0 ppb (17) 0.29 ppb (3) N/A 22.0 μg/m3 (71) 71.0
 
July 15, 2019, 5 p.m. 12.3 ppb (11) 5.5 ppb (5) N/A 7.0 ppb (6) N/A N/A 21.0 ppb (16) 0.29 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
July 15, 2019, 4 p.m. 13.6 ppb (13) 6.1 ppb (6) N/A 8.0 ppb (7) N/A N/A 18.0 ppb (14) 0.3 ppb (3) N/A 20.0 μg/m3 (67) 67.0
 
July 15, 2019, 3 p.m. 23.7 ppb (22) 13.4 ppb (12) N/A 10.0 ppb (9) N/A N/A 10.0 ppb (8) 0.41 ppb (5) N/A 21.0 μg/m3 (69) 69.0
 
July 15, 2019, 2 p.m. 30.4 ppb (28) 16.9 ppb (16) N/A 13.0 ppb (12) N/A N/A 6.0 ppb (5) 0.47 ppb (5) N/A 4.0 μg/m3 (17) 28.0
 
July 15, 2019, 1 p.m. 22.2 ppb (21) 11.2 ppb (10) N/A 11.0 ppb (10) N/A N/A 2.0 ppb (2) 0.45 ppb (5) N/A 4.0 μg/m3 (17) 21.0
 
July 15, 2019, noon 10.6 ppb (10) 1.8 ppb (2) N/A 9.0 ppb (8) N/A N/A 3.0 ppb (2) 0.32 ppb (4) N/A 5.0 μg/m3 (21) 21.0