AQSQID: 060811001

Site Name: Redwood City

Location: San Mateo Co, CA

Reporting: True, Located: True

Current AQI: 13.0

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
Sept. 21, 2019, 6 a.m. 8.9 ppb (8) 0.6 ppb (1) N/A 8.0 ppb (7) N/A N/A 17.0 ppb (13) 0.34 ppb (4) N/A N/A 13.0
 
Sept. 21, 2019, 5 a.m. 9.7 ppb (9) 0.8 ppb (1) N/A 9.0 ppb (8) N/A N/A 20.0 ppb (15) 0.38 ppb (4) N/A N/A 15.0
 
Sept. 21, 2019, 4 a.m. 12.7 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A N/A 17.0 ppb (13) 0.41 ppb (5) N/A N/A 13.0
 
Sept. 21, 2019, 3 a.m. 9.7 ppb (9) 0.7 ppb (1) N/A 9.0 ppb (8) N/A N/A 22.0 ppb (17) 0.38 ppb (4) N/A N/A 17.0
 
Sept. 21, 2019, 2 a.m. 7.4 ppb (7) 0.8 ppb (1) N/A 7.0 ppb (6) N/A N/A 27.0 ppb (21) 0.33 ppb (4) N/A N/A 21.0
 
Sept. 21, 2019, 1 a.m. 4.4 ppb (4) 0.8 ppb (1) N/A 4.0 ppb (4) N/A N/A 34.0 ppb (26) 0.29 ppb (3) N/A N/A 26.0
 
Sept. 21, 2019, midnight 6.1 ppb (6) 1.1 ppb (1) N/A 5.0 ppb (5) N/A N/A 39.0 ppb (30) 0.31 ppb (3) N/A N/A 30.0
 
Sept. 20, 2019, 11 p.m. 7.8 ppb (7) 1.5 ppb (1) N/A 6.0 ppb (6) N/A N/A 43.0 ppb (33) 0.32 ppb (4) N/A N/A 33.0
 
Sept. 20, 2019, 10 p.m. 5.4 ppb (5) 1.1 ppb (1) N/A 4.0 ppb (4) N/A N/A 41.0 ppb (32) 0.27 ppb (3) N/A N/A 32.0
 
Sept. 20, 2019, 9 p.m. 4.2 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 38.0 ppb (29) 0.26 ppb (3) N/A N/A 29.0
 
Sept. 20, 2019, 8 p.m. 5.6 ppb (5) 1.1 ppb (1) N/A 5.0 ppb (5) N/A N/A 41.0 ppb (32) 0.29 ppb (3) N/A N/A 32.0
 
Sept. 20, 2019, 7 p.m. 6.6 ppb (6) 1.8 ppb (2) N/A 5.0 ppb (5) N/A N/A 35.0 ppb (27) 0.29 ppb (3) N/A N/A 27.0
 
Sept. 20, 2019, 6 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 30.0 ppb (23) 0.29 ppb (3) N/A N/A 23.0
 
Sept. 20, 2019, 5 p.m. 14.1 ppb (13) 4.8 ppb (4) N/A 9.0 ppb (8) N/A N/A 22.0 ppb (17) 0.37 ppb (4) N/A N/A 17.0
 
Sept. 20, 2019, 4 p.m. 14.0 ppb (13) 5.2 ppb (5) N/A 9.0 ppb (8) N/A N/A 17.0 ppb (13) 0.41 ppb (5) N/A N/A 13.0
 
Sept. 20, 2019, 3 p.m. 37.4 ppb (35) 23.2 ppb (21) N/A 14.0 ppb (13) N/A N/A 6.0 ppb (5) 0.64 ppb (7) N/A N/A 35.0
 
Sept. 20, 2019, 2 p.m. 62.0 ppb (59) 42.6 ppb (39) N/A 19.0 ppb (18) N/A N/A 1.0 ppb (1) 0.91 ppb (10) N/A N/A 59.0
 
Sept. 20, 2019, 1 p.m. 28.9 ppb (27) 15.6 ppb (14) N/A 13.0 ppb (12) N/A N/A 2.0 ppb (2) 0.58 ppb (6) N/A N/A 27.0
 
Sept. 20, 2019, noon 11.6 ppb (11) 1.8 ppb (2) N/A 10.0 ppb (9) N/A N/A 5.0 ppb (4) 0.36 ppb (4) N/A N/A 11.0
 
Sept. 20, 2019, 10 a.m. 5.2 ppb (5) 0.3 ppb (0) N/A 5.0 ppb (5) N/A N/A 13.0 ppb (10) 0.31 ppb (3) N/A N/A 10.0
 
Sept. 20, 2019, 9 a.m. 12.8 ppb (12) 6.0 ppb (6) N/A 7.0 ppb (6) N/A N/A 11.0 ppb (8) 0.31 ppb (3) N/A N/A 12.0
 
Sept. 20, 2019, 8 a.m. 7.0 ppb (6) 0.3 ppb (0) N/A 7.0 ppb (6) N/A N/A 16.0 ppb (12) 0.3 ppb (3) N/A N/A 12.0
 
Sept. 20, 2019, 7 a.m. 6.6 ppb (6) 0.3 ppb (0) N/A 6.0 ppb (6) N/A N/A 18.0 ppb (14) 0.3 ppb (3) N/A N/A 14.0
 
Sept. 20, 2019, 6 a.m. 12.9 ppb (12) 1.2 ppb (1) N/A 12.0 ppb (11) N/A N/A 14.0 ppb (11) 0.36 ppb (4) N/A N/A 12.0
 
Sept. 20, 2019, 5 a.m. 10.7 ppb (10) 0.5 ppb (0) N/A 10.0 ppb (9) N/A N/A 15.0 ppb (12) 0.35 ppb (4) N/A N/A 12.0
 
Sept. 20, 2019, 4 a.m. 8.7 ppb (8) 0.4 ppb (0) N/A 8.0 ppb (7) N/A N/A 21.0 ppb (16) 0.37 ppb (4) N/A N/A 16.0
 
Sept. 20, 2019, 3 a.m. 6.2 ppb (6) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A 27.0 ppb (21) 0.32 ppb (4) N/A N/A 21.0
 
Sept. 20, 2019, 2 a.m. 5.3 ppb (5) 0.5 ppb (0) N/A 5.0 ppb (5) N/A N/A 29.0 ppb (22) 0.32 ppb (4) N/A N/A 22.0
 
Sept. 20, 2019, 1 a.m. 5.9 ppb (5) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A 30.0 ppb (23) 0.3 ppb (3) N/A N/A 23.0
 
Sept. 20, 2019, midnight 5.9 ppb (5) 1.3 ppb (1) N/A 5.0 ppb (5) N/A N/A 33.0 ppb (25) 0.32 ppb (4) N/A N/A 25.0
 
Sept. 19, 2019, 11 p.m. 7.5 ppb (7) 1.8 ppb (2) N/A 6.0 ppb (6) N/A N/A 35.0 ppb (27) 0.33 ppb (4) N/A N/A 27.0
 
Sept. 19, 2019, 10 p.m. 5.5 ppb (5) 1.3 ppb (1) N/A 4.0 ppb (4) N/A N/A 41.0 ppb (32) 0.3 ppb (3) N/A N/A 32.0
 
Sept. 19, 2019, 9 p.m. 4.5 ppb (4) 1.4 ppb (1) N/A 3.0 ppb (3) N/A N/A 37.0 ppb (28) 0.26 ppb (3) N/A N/A 28.0
 
Sept. 19, 2019, 8 p.m. 7.3 ppb (7) 2.4 ppb (2) N/A 5.0 ppb (5) N/A N/A 32.0 ppb (25) 0.27 ppb (3) N/A N/A 25.0
 
Sept. 19, 2019, 7 p.m. 8.9 ppb (8) 3.4 ppb (3) N/A 6.0 ppb (6) N/A N/A 27.0 ppb (21) 0.33 ppb (4) N/A N/A 21.0
 
Sept. 19, 2019, 6 p.m. 7.4 ppb (7) 2.6 ppb (2) N/A 5.0 ppb (5) N/A N/A 25.0 ppb (19) 0.31 ppb (3) N/A N/A 19.0
 
Sept. 19, 2019, 5 p.m. 9.8 ppb (9) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A 23.0 ppb (18) 0.32 ppb (4) N/A N/A 18.0
 
Sept. 19, 2019, 4 p.m. 11.0 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (6) N/A N/A 20.0 ppb (15) 0.36 ppb (4) N/A N/A 15.0
 
Sept. 19, 2019, 3 p.m. 31.2 ppb (29) 16.7 ppb (15) N/A 15.0 ppb (14) N/A N/A 9.0 ppb (7) 0.58 ppb (6) N/A N/A 29.0
 
Sept. 19, 2019, 2 p.m. 45.5 ppb (42) 28.4 ppb (26) N/A 17.0 ppb (16) N/A N/A 2.0 ppb (2) 0.82 ppb (9) N/A N/A 42.0
 
Sept. 19, 2019, 1 p.m. 24.7 ppb (23) 9.4 ppb (9) N/A 15.0 ppb (14) N/A N/A 4.0 ppb (3) 0.72 ppb (8) N/A N/A 23.0
 
Sept. 19, 2019, noon 9.0 ppb (8) 1.5 ppb (1) N/A 8.0 ppb (7) N/A N/A 12.0 ppb (9) 0.34 ppb (4) N/A N/A 9.0
 
Sept. 19, 2019, 11 a.m. 3.3 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 24.0 ppb (18) 0.4 ppb (4) N/A N/A 18.0
 
Sept. 19, 2019, 9 a.m. 2.3 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A 22.0 ppb (17) 0.29 ppb (3) N/A N/A 17.0
 
Sept. 19, 2019, 8 a.m. 3.2 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 22.0 ppb (17) 0.31 ppb (3) N/A N/A 17.0
 
Sept. 19, 2019, 7 a.m. 2.3 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A 25.0 ppb (19) 0.31 ppb (3) N/A N/A 19.0
 
Sept. 19, 2019, 6 a.m. 3.5 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 24.0 ppb (18) 0.29 ppb (3) N/A N/A 18.0
 
Sept. 19, 2019, 5 a.m. 2.3 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 25.0 ppb (19) 0.28 ppb (3) N/A N/A 19.0
 
Sept. 19, 2019, 4 a.m. 2.8 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) 0.29 ppb (3) N/A N/A 20.0
 
Sept. 19, 2019, 3 a.m. 4.7 ppb (4) 0.8 ppb (1) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (19) 0.32 ppb (4) N/A N/A 19.0
 
Sept. 19, 2019, 2 a.m. 5.2 ppb (5) 0.8 ppb (1) N/A 5.0 ppb (5) N/A N/A 26.0 ppb (20) 0.32 ppb (4) N/A N/A 20.0
 
Sept. 19, 2019, 1 a.m. 3.1 ppb (3) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A 27.0 ppb (21) 0.33 ppb (4) N/A N/A 21.0
 
Sept. 19, 2019, midnight 4.8 ppb (4) 1.3 ppb (1) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (19) 0.36 ppb (4) N/A N/A 19.0
 
Sept. 18, 2019, 11 p.m. 3.9 ppb (4) 1.1 ppb (1) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) 0.36 ppb (4) N/A N/A 20.0
 
Sept. 18, 2019, 10 p.m. 3.5 ppb (3) 1.2 ppb (1) N/A 2.0 ppb (2) N/A N/A 25.0 ppb (19) 0.33 ppb (4) N/A N/A 19.0
 
Sept. 18, 2019, 9 p.m. 4.9 ppb (5) 1.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) 0.35 ppb (4) N/A N/A 20.0
 
Sept. 18, 2019, 8 p.m. 7.5 ppb (7) 2.6 ppb (2) N/A 5.0 ppb (5) N/A N/A 24.0 ppb (18) 0.34 ppb (4) N/A N/A 18.0
 
Sept. 18, 2019, 7 p.m. 6.3 ppb (6) 2.3 ppb (2) N/A 4.0 ppb (4) N/A N/A 20.0 ppb (15) 0.35 ppb (4) N/A N/A 15.0
 
Sept. 18, 2019, 6 p.m. 5.3 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 19.0 ppb (15) 0.34 ppb (4) N/A N/A 15.0
 
Sept. 18, 2019, 5 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 20.0 ppb (15) 0.35 ppb (4) N/A N/A 15.0
 
Sept. 18, 2019, 4 p.m. 21.1 ppb (20) 7.1 ppb (7) N/A 14.0 ppb (13) N/A N/A 9.0 ppb (7) 0.47 ppb (5) N/A N/A 20.0
 
Sept. 18, 2019, 3 p.m. 28.3 ppb (26) 12.0 ppb (11) N/A 16.0 ppb (15) N/A N/A 5.0 ppb (4) 0.52 ppb (6) N/A N/A 26.0
 
Sept. 18, 2019, 2 p.m. 25.3 ppb (23) 9.9 ppb (9) N/A 16.0 ppb (15) N/A N/A 7.0 ppb (5) 0.54 ppb (6) N/A N/A 23.0
 
Sept. 18, 2019, 1 p.m. 19.7 ppb (18) 6.2 ppb (6) N/A 14.0 ppb (13) N/A N/A 7.0 ppb (5) 0.37 ppb (4) N/A N/A 18.0
 
Sept. 18, 2019, noon 5.6 ppb (5) 0.4 ppb (0) N/A 5.0 ppb (5) N/A N/A 13.0 ppb (10) 0.31 ppb (3) N/A N/A 10.0
 
Sept. 18, 2019, 10 a.m. 8.5 ppb (8) 2.2 ppb (2) N/A 6.0 ppb (6) N/A N/A 9.0 ppb (7) 0.28 ppb (3) N/A N/A 8.0
 
Sept. 18, 2019, 9 a.m. 4.7 ppb (4) 0.8 ppb (1) N/A 4.0 ppb (4) N/A N/A 11.0 ppb (8) 0.31 ppb (3) N/A N/A 8.0
 
Sept. 18, 2019, 8 a.m. 4.4 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A 13.0 ppb (10) 0.29 ppb (3) N/A N/A 10.0
 
Sept. 18, 2019, 7 a.m. 3.8 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A 15.0 ppb (12) 0.3 ppb (3) N/A N/A 12.0
 
Sept. 18, 2019, 6 a.m. 5.1 ppb (5) 0.3 ppb (0) N/A 5.0 ppb (5) N/A N/A 15.0 ppb (12) 0.32 ppb (4) N/A N/A 12.0
 
Sept. 18, 2019, 5 a.m. 2.9 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 22.0 ppb (17) 0.3 ppb (3) N/A N/A 17.0
 
Sept. 18, 2019, 4 a.m. 2.4 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 23.0 ppb (18) 0.29 ppb (3) N/A N/A 18.0
 
Sept. 18, 2019, 3 a.m. 3.4 ppb (3) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A 23.0 ppb (18) 0.33 ppb (4) N/A N/A 18.0
 
Sept. 18, 2019, 2 a.m. 4.2 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A 24.0 ppb (18) 0.4 ppb (4) N/A N/A 18.0
 
Sept. 18, 2019, 1 a.m. 3.7 ppb (3) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) 0.33 ppb (4) N/A N/A 20.0
 
Sept. 18, 2019, midnight 5.2 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A N/A 27.0 ppb (21) 0.37 ppb (4) N/A N/A 21.0
 
Sept. 17, 2019, 11 p.m. 4.3 ppb (4) 1.5 ppb (1) N/A 3.0 ppb (3) N/A N/A 28.0 ppb (22) 0.29 ppb (3) N/A N/A 22.0
 
Sept. 17, 2019, 10 p.m. 4.5 ppb (4) 1.4 ppb (1) N/A 3.0 ppb (3) N/A N/A 30.0 ppb (23) 0.29 ppb (3) N/A N/A 23.0
 
Sept. 17, 2019, 9 p.m. 8.3 ppb (8) 2.3 ppb (2) N/A 6.0 ppb (6) N/A N/A 33.0 ppb (25) 0.34 ppb (4) N/A N/A 25.0
 
Sept. 17, 2019, 8 p.m. 12.7 ppb (12) 3.6 ppb (3) N/A 9.0 ppb (8) N/A N/A 32.0 ppb (25) 0.36 ppb (4) N/A N/A 25.0
 
Sept. 17, 2019, 7 p.m. 6.6 ppb (6) 1.8 ppb (2) N/A 5.0 ppb (5) N/A N/A 32.0 ppb (25) 0.33 ppb (4) N/A N/A 25.0
 
Sept. 17, 2019, 6 p.m. 8.0 ppb (7) 2.7 ppb (3) N/A 5.0 ppb (5) N/A N/A 25.0 ppb (19) 0.32 ppb (4) N/A N/A 19.0
 
Sept. 17, 2019, 5 p.m. 10.1 ppb (9) 3.5 ppb (3) N/A 7.0 ppb (6) N/A N/A 22.0 ppb (17) 0.35 ppb (4) N/A N/A 17.0
 
Sept. 17, 2019, 4 p.m. 13.4 ppb (12) 5.4 ppb (5) N/A 8.0 ppb (7) N/A N/A 17.0 ppb (13) 0.37 ppb (4) N/A N/A 13.0
 
Sept. 17, 2019, 3 p.m. 23.6 ppb (22) 12.1 ppb (11) N/A 12.0 ppb (11) N/A N/A 8.0 ppb (6) 0.47 ppb (5) N/A N/A 22.0
 
Sept. 17, 2019, 2 p.m. 40.0 ppb (37) 23.8 ppb (22) N/A 16.0 ppb (15) N/A N/A 2.0 ppb (2) 0.75 ppb (8) N/A N/A 37.0
 
Sept. 17, 2019, 1 p.m. 21.6 ppb (20) 8.4 ppb (8) N/A 13.0 ppb (12) N/A N/A 4.0 ppb (3) 0.46 ppb (5) N/A N/A 20.0
 
Sept. 17, 2019, noon 7.5 ppb (7) 1.2 ppb (1) N/A 6.0 ppb (6) N/A N/A 9.0 ppb (7) 0.32 ppb (4) N/A N/A 7.0
 
Sept. 17, 2019, 10 a.m. 5.3 ppb (5) 0.4 ppb (0) N/A 5.0 ppb (5) N/A N/A 12.0 ppb (9) 0.44 ppb (5) N/A N/A 9.0
 
Sept. 17, 2019, 9 a.m. 3.2 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 17.0 ppb (13) 0.29 ppb (3) N/A N/A 13.0
 
Sept. 17, 2019, 8 a.m. 3.2 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 17.0 ppb (13) 0.29 ppb (3) N/A N/A 13.0
 
Sept. 17, 2019, 7 a.m. 5.0 ppb (5) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A 15.0 ppb (12) 0.3 ppb (3) N/A N/A 12.0
 
Sept. 17, 2019, 6 a.m. 4.3 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A 19.0 ppb (15) 0.3 ppb (3) N/A N/A 15.0
 
Sept. 17, 2019, 5 a.m. 4.5 ppb (4) 0.5 ppb (0) N/A 4.0 ppb (4) N/A N/A 21.0 ppb (16) 0.33 ppb (4) N/A N/A 16.0
 
Sept. 17, 2019, 4 a.m. 3.1 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 23.0 ppb (18) 0.3 ppb (3) N/A N/A 18.0
 
Sept. 17, 2019, 3 a.m. 2.8 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A 25.0 ppb (19) 0.31 ppb (3) N/A N/A 19.0
 
Sept. 17, 2019, 2 a.m. 2.8 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) 0.29 ppb (3) N/A N/A 20.0
 
Sept. 17, 2019, 1 a.m. 3.5 ppb (3) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A 27.0 ppb (21) 0.31 ppb (3) N/A N/A 21.0
 
Sept. 17, 2019, midnight 3.7 ppb (3) 1.1 ppb (1) N/A 3.0 ppb (3) N/A N/A 28.0 ppb (22) 0.35 ppb (4) N/A N/A 22.0
 
Sept. 16, 2019, 11 p.m. 4.0 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A N/A 27.0 ppb (21) 0.31 ppb (3) N/A N/A 21.0
 
Sept. 16, 2019, 10 p.m. 4.2 ppb (4) 1.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 28.0 ppb (22) 0.31 ppb (3) N/A N/A 22.0
 
Sept. 16, 2019, 9 p.m. 2.6 ppb (2) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A 30.0 ppb (23) 0.28 ppb (3) N/A N/A 23.0
 
Sept. 16, 2019, 8 p.m. 3.7 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 30.0 ppb (23) 0.31 ppb (3) N/A N/A 23.0
 
Sept. 16, 2019, 7 p.m. 2.9 ppb (3) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A 31.0 ppb (24) 0.3 ppb (3) N/A N/A 24.0
 
Sept. 16, 2019, 6 p.m. 3.2 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A 31.0 ppb (24) 0.31 ppb (3) N/A N/A 24.0
 
Sept. 16, 2019, 5 p.m. 4.0 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A 30.0 ppb (23) 0.36 ppb (4) N/A N/A 23.0
 
Sept. 16, 2019, 4 p.m. 6.6 ppb (6) 1.8 ppb (2) N/A 5.0 ppb (5) N/A N/A 28.0 ppb (22) 0.34 ppb (4) N/A -2.0 μg/m3 (0) 22.0
 
Sept. 16, 2019, 3 p.m. 5.6 ppb (5) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A 28.0 ppb (22) 0.34 ppb (4) N/A -2.0 μg/m3 (0) 22.0
 
Sept. 16, 2019, 2 p.m. 8.7 ppb (8) 1.5 ppb (1) N/A 7.0 ppb (6) N/A N/A 22.0 ppb (17) 0.34 ppb (4) N/A -4.0 μg/m3 (0) 17.0
 
Sept. 16, 2019, 1 p.m. 6.8 ppb (6) 0.9 ppb (1) N/A 6.0 ppb (6) N/A N/A 19.0 ppb (15) 0.33 ppb (4) N/A -3.0 μg/m3 (0) 15.0
 
Sept. 16, 2019, noon 3.7 ppb (3) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A 13.0 ppb (10) 0.31 ppb (3) N/A -2.0 μg/m3 (0) 10.0
 
Sept. 16, 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
Sept. 16, 2019, 10 a.m. 2.6 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 14.0 ppb (11) 0.29 ppb (3) N/A 0.0 μg/m3 (0) 11.0
 
Sept. 16, 2019, 9 a.m. 2.0 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 15.0 ppb (12) 0.29 ppb (3) N/A -1.0 μg/m3 (0) 12.0
 
Sept. 16, 2019, 8 a.m. 1.3 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A 18.0 ppb (14) 0.28 ppb (3) N/A -1.0 μg/m3 (0) 14.0
 
Sept. 16, 2019, 7 a.m. 1.6 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A 19.0 ppb (15) 0.28 ppb (3) N/A 0.0 μg/m3 (0) 15.0
 
Sept. 16, 2019, 6 a.m. 1.4 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A 19.0 ppb (15) 0.28 ppb (3) N/A -1.0 μg/m3 (0) 15.0
 
Sept. 16, 2019, 5 a.m. 1.3 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A 21.0 ppb (16) 0.28 ppb (3) N/A 2.0 μg/m3 (8) 16.0
 
Sept. 16, 2019, 4 a.m. 1.5 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A 22.0 ppb (17) 0.28 ppb (3) N/A 3.0 μg/m3 (12) 17.0
 
Sept. 16, 2019, 3 a.m. 1.9 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A 23.0 ppb (18) 0.3 ppb (3) N/A 3.0 μg/m3 (12) 18.0
 
Sept. 16, 2019, 2 a.m. 1.4 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A 25.0 ppb (19) 0.31 ppb (3) N/A 2.0 μg/m3 (8) 19.0
 
Sept. 16, 2019, 1 a.m. 1.4 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A 27.0 ppb (21) 0.3 ppb (3) N/A 2.0 μg/m3 (8) 21.0
 
Sept. 16, 2019, midnight 1.3 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A 27.0 ppb (21) 0.27 ppb (3) N/A 3.0 μg/m3 (12) 21.0
 
Sept. 15, 2019, 11 p.m. 1.5 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A 30.0 ppb (23) 0.26 ppb (3) N/A 3.0 μg/m3 (12) 23.0
 
Sept. 15, 2019, 10 p.m. 1.4 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A 31.0 ppb (24) 0.26 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 15, 2019, 9 p.m. 1.4 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A 33.0 ppb (25) 0.26 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 15, 2019, 8 p.m. 1.5 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A 32.0 ppb (25) 0.26 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
Sept. 15, 2019, 7 p.m. 1.7 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A 32.0 ppb (25) 0.25 ppb (3) N/A 17.0 μg/m3 (61) 61.0
 
Sept. 15, 2019, 6 p.m. 2.1 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A 31.0 ppb (24) 0.27 ppb (3) N/A 26.0 μg/m3 (80) 80.0
 
Sept. 15, 2019, 5 p.m. 2.9 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A 28.0 ppb (22) 0.27 ppb (3) N/A 24.0 μg/m3 (76) 76.0
 
Sept. 15, 2019, 4 p.m. 4.3 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A N/A 22.0 ppb (17) 0.29 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 15, 2019, 3 p.m. 6.5 ppb (6) 1.6 ppb (1) N/A 5.0 ppb (5) N/A N/A 15.0 ppb (12) 0.33 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 15, 2019, 2 p.m. 6.2 ppb (6) 0.8 ppb (1) N/A 5.0 ppb (5) N/A N/A 13.0 ppb (10) 0.32 ppb (4) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 15, 2019, 1 p.m. 7.0 ppb (6) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A 7.0 ppb (5) 0.4 ppb (4) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 15, 2019, noon 4.8 ppb (4) 0.3 ppb (0) N/A 5.0 ppb (5) N/A N/A 13.0 ppb (10) 0.3 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 15, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -1.0 μg/m3 (0) N/A
Sept. 15, 2019, 10 a.m. 6.4 ppb (6) 0.5 ppb (0) N/A 6.0 ppb (6) N/A N/A 7.0 ppb (5) 0.38 ppb (4) N/A 1.0 μg/m3 (4) 6.0
 
Sept. 15, 2019, 9 a.m. 8.1 ppb (8) 0.7 ppb (1) N/A 7.0 ppb (6) N/A N/A 6.0 ppb (5) 0.4 ppb (4) N/A 13.0 μg/m3 (52) 52.0
 
Sept. 15, 2019, 8 a.m. 4.2 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A 18.0 ppb (14) 0.3 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 15, 2019, 7 a.m. 4.8 ppb (4) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A 20.0 ppb (15) 0.31 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 15, 2019, 6 a.m. 4.7 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A 21.0 ppb (16) 0.31 ppb (3) N/A 2.0 μg/m3 (8) 16.0
 
Sept. 15, 2019, 5 a.m. 6.4 ppb (6) 0.4 ppb (0) N/A 6.0 ppb (6) N/A N/A 19.0 ppb (15) 0.33 ppb (4) N/A -1.0 μg/m3 (0) 15.0
 
Sept. 15, 2019, 4 a.m. 10.0 ppb (9) 0.6 ppb (1) N/A 9.0 ppb (8) N/A N/A 14.0 ppb (11) 0.37 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 15, 2019, 3 a.m. 9.0 ppb (8) 0.4 ppb (0) N/A 9.0 ppb (8) N/A N/A 16.0 ppb (12) 0.35 ppb (4) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 15, 2019, 2 a.m. 3.4 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 25.0 ppb (19) 0.27 ppb (3) N/A 2.0 μg/m3 (8) 19.0
 
Sept. 15, 2019, 1 a.m. 6.1 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A 23.0 ppb (18) 0.3 ppb (3) N/A 3.0 μg/m3 (12) 18.0
 
Sept. 15, 2019, midnight 10.0 ppb (9) 2.7 ppb (3) N/A 7.0 ppb (6) N/A N/A 23.0 ppb (18) 0.32 ppb (4) N/A 3.0 μg/m3 (12) 18.0
 
Sept. 14, 2019, 11 p.m. 10.9 ppb (10) 3.5 ppb (3) N/A 8.0 ppb (7) N/A N/A 23.0 ppb (18) 0.32 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 14, 2019, 10 p.m. 14.0 ppb (13) 4.8 ppb (4) N/A 9.0 ppb (8) N/A N/A 22.0 ppb (17) 0.33 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 14, 2019, 9 p.m. 11.0 ppb (10) 3.9 ppb (4) N/A 7.0 ppb (6) N/A N/A 23.0 ppb (18) 0.31 ppb (3) N/A 4.0 μg/m3 (17) 18.0
 
Sept. 14, 2019, 8 p.m. 5.2 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A N/A 28.0 ppb (22) 0.3 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 14, 2019, 7 p.m. 5.9 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A N/A 30.0 ppb (23) 0.32 ppb (4) N/A 20.0 μg/m3 (67) 67.0
 
Sept. 14, 2019, 6 p.m. 11.6 ppb (11) 3.7 ppb (3) N/A 8.0 ppb (7) N/A N/A 26.0 ppb (20) 0.36 ppb (4) N/A 18.0 μg/m3 (63) 63.0
 
Sept. 14, 2019, 5 p.m. 13.2 ppb (12) 4.5 ppb (4) N/A 9.0 ppb (8) N/A N/A 20.0 ppb (15) 0.37 ppb (4) N/A 21.0 μg/m3 (69) 69.0
 
Sept. 14, 2019, 4 p.m. 18.8 ppb (17) 7.8 ppb (7) N/A 11.0 ppb (10) N/A N/A 14.0 ppb (11) 0.38 ppb (4) N/A 39.0 μg/m3 (109) 109.0
 
Sept. 14, 2019, 3 p.m. 31.1 ppb (29) 13.3 ppb (12) N/A 18.0 ppb (17) N/A N/A 9.0 ppb (7) 0.56 ppb (6) N/A 16.0 μg/m3 (59) 59.0
 
Sept. 14, 2019, 2 p.m. 27.9 ppb (26) 10.9 ppb (10) N/A 17.0 ppb (16) N/A N/A 5.0 ppb (4) 0.61 ppb (7) N/A 16.0 μg/m3 (59) 59.0
 
Sept. 14, 2019, 1 p.m. 18.4 ppb (17) 3.6 ppb (3) N/A 15.0 ppb (14) N/A N/A 4.0 ppb (3) 0.4 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 14, 2019, noon 13.2 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A N/A 5.0 ppb (4) 0.38 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 14, 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 (0) N/A
Sept. 14, 2019, 10 a.m. 12.5 ppb (12) 0.4 ppb (0) N/A 12.0 ppb (11) N/A N/A 8.0 ppb (6) 0.4 ppb (4) N/A 22.0 μg/m3 (71) 71.0
 
Sept. 14, 2019, 9 a.m. 14.4 ppb (13) 0.5 ppb (0) N/A 14.0 ppb (13) N/A N/A 7.0 ppb (5) 0.44 ppb (5) N/A 0.0 μg/m3 (0) 13.0
 
Sept. 14, 2019, 8 a.m. 20.7 ppb (19) 1.5 ppb (1) N/A 19.0 ppb (18) N/A N/A 5.0 ppb (4) 0.48 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 14, 2019, 7 a.m. 20.7 ppb (19) 0.9 ppb (1) N/A 20.0 ppb (19) N/A N/A 10.0 ppb (8) 0.51 ppb (6) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 14, 2019, 6 a.m. 18.5 ppb (17) 0.9 ppb (1) N/A 18.0 ppb (17) N/A N/A 15.0 ppb (12) 0.49 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 14, 2019, 5 a.m. 23.9 ppb (22) 0.5 ppb (0) N/A 23.0 ppb (21) N/A N/A 14.0 ppb (11) 0.55 ppb (6) N/A 15.0 μg/m3 (56) 56.0
 
Sept. 14, 2019, 4 a.m. 17.0 ppb (16) 0.5 ppb (0) N/A 17.0 ppb (16) N/A N/A 25.0 ppb (19) 0.46 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 14, 2019, 3 a.m. 15.7 ppb (15) 0.6 ppb (1) N/A 15.0 ppb (14) N/A N/A 36.0 ppb (28) 0.41 ppb (5) N/A 8.0 μg/m3 (33) 33.0