AQSQID: 060130002

Site Name: Concord

Location: Concord, CA

Reporting: True, Located: True

Current AQI: 12.0

Concord CA, US: 37.9383, -122.025

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 18, 2019, noon 12.6 ppb (12) 1.8 ppb (2) N/A 11.0 ppb (10) N/A 1.0 ppb (1) 6.0 ppb (5) 0.32 ppb (4) N/A -1.0 μg/m3 (0) 12.0
 
March 18, 2019, 11 a.m. 8.6 ppb (8) 0.2 ppb (0) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 9.0 ppb (7) 0.33 ppb (4) N/A -1.0 μg/m3 (0) 8.0
 
March 18, 2019, 10 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
March 18, 2019, 9 a.m. 5.5 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 18.0 ppb (14) 0.3 ppb (3) N/A -2.0 μg/m3 (0) 14.0
 
March 18, 2019, 8 a.m. 5.3 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 21.0 ppb (16) 0.31 ppb (3) N/A -2.0 μg/m3 (0) 16.0
 
March 18, 2019, 7 a.m. 8.2 ppb (8) 0.2 ppb (0) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 18.0 ppb (14) 0.48 ppb (5) N/A -1.0 μg/m3 (0) 14.0
 
March 18, 2019, 6 a.m. 4.7 ppb (4) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 27.0 ppb (21) 0.4 ppb (4) N/A 0.0 μg/m3 (0) 21.0
 
March 18, 2019, 5 a.m. 3.3 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 33.0 ppb (25) 0.31 ppb (3) N/A -1.0 μg/m3 (0) 25.0
 
March 18, 2019, 4 a.m. 3.9 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 34.0 ppb (26) 0.34 ppb (4) N/A 0.0 μg/m3 (0) 26.0
 
March 18, 2019, 3 a.m. 4.9 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 40.0 ppb (31) 0.38 ppb (4) N/A 1.0 μg/m3 (4) 31.0
 
March 18, 2019, 2 a.m. 5.6 ppb (5) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 50.0 ppb (38) 0.39 ppb (4) N/A -1.0 μg/m3 (0) 38.0
 
March 18, 2019, 1 a.m. 4.1 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 56.0 ppb (43) 0.36 ppb (4) N/A -2.0 μg/m3 (0) 43.0
 
March 18, 2019, midnight 4.2 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 59.0 ppb (45) 0.35 ppb (4) N/A -3.0 μg/m3 (0) 45.0
 
March 17, 2019, 11 p.m. 4.0 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 60.0 ppb (46) 0.36 ppb (4) N/A -3.0 μg/m3 (0) 46.0
 
March 17, 2019, 10 p.m. 3.3 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 59.0 ppb (45) 0.35 ppb (4) N/A -1.0 μg/m3 (0) 45.0
 
March 17, 2019, 9 p.m. 3.5 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 56.0 ppb (43) 0.35 ppb (4) N/A -1.0 μg/m3 (0) 43.0
 
March 17, 2019, 8 p.m. 4.1 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 50.0 ppb (38) 0.36 ppb (4) N/A 0.0 μg/m3 (0) 38.0
 
March 17, 2019, 7 p.m. 5.6 ppb (5) 0.9 ppb (1) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 41.0 ppb (32) 0.37 ppb (4) N/A -1.0 μg/m3 (0) 32.0
 
March 17, 2019, 6 p.m. 7.5 ppb (7) 1.7 ppb (2) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 34.0 ppb (26) 0.38 ppb (4) N/A -1.0 μg/m3 (0) 26.0
 
March 17, 2019, 5 p.m. 13.6 ppb (13) 4.6 ppb (4) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 23.0 ppb (18) 0.46 ppb (5) N/A -1.0 μg/m3 (0) 18.0
 
March 17, 2019, 4 p.m. 12.9 ppb (12) 3.7 ppb (3) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 19.0 ppb (15) 0.44 ppb (5) N/A 0.0 μg/m3 (0) 15.0
 
March 17, 2019, 3 p.m. 12.9 ppb (12) 3.6 ppb (3) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 14.0 ppb (11) 0.4 ppb (4) N/A 2.0 μg/m3 (8) 12.0
 
March 17, 2019, 2 p.m. 16.5 ppb (15) 2.8 ppb (3) N/A 14.0 ppb (13) N/A 1.0 ppb (1) 4.0 ppb (3) 0.36 ppb (4) N/A 2.0 μg/m3 (8) 15.0
 
March 17, 2019, 1 p.m. 14.3 ppb (13) 1.1 ppb (1) N/A 13.0 ppb (12) N/A 1.0 ppb (1) 5.0 ppb (4) 0.36 ppb (4) N/A 0.0 μg/m3 (0) 13.0
 
March 17, 2019, noon 8.3 ppb (8) 0.3 ppb (0) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 11.0 ppb (8) 0.31 ppb (3) N/A -1.0 μg/m3 (0) 8.0
 
March 17, 2019, 11 a.m. 7.1 ppb (7) 0.1 ppb (0) N/A 7.0 ppb (6) N/A 2.0 ppb (3) 13.0 ppb (10) 0.33 ppb (4) N/A -2.0 μg/m3 (0) 10.0
 
March 17, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -3.0 μg/m3 (0) N/A
March 17, 2019, 9 a.m. 9.3 ppb (9) 0.1 ppb (0) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 15.0 ppb (12) 0.41 ppb (5) N/A -1.0 μg/m3 (0) 12.0
 
March 17, 2019, 8 a.m. 8.5 ppb (8) 0.1 ppb (0) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 22.0 ppb (17) 0.4 ppb (4) N/A 0.0 μg/m3 (0) 17.0
 
March 17, 2019, 7 a.m. 9.4 ppb (9) 0.0 ppb (0) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 23.0 ppb (18) 0.45 ppb (5) N/A -3.0 μg/m3 (0) 18.0
 
March 17, 2019, 6 a.m. 8.6 ppb (8) 0.1 ppb (0) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 25.0 ppb (19) 0.39 ppb (4) N/A -3.0 μg/m3 (0) 19.0
 
March 17, 2019, 5 a.m. 6.6 ppb (6) 0.5 ppb (0) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 31.0 ppb (24) 0.33 ppb (4) N/A -3.0 μg/m3 (0) 24.0
 
March 17, 2019, 4 a.m. 7.3 ppb (7) 0.0 ppb (0) N/A 7.0 ppb (6) N/A 1.0 ppb (1) 30.0 ppb (23) 0.36 ppb (4) N/A -3.0 μg/m3 (0) 23.0
 
March 17, 2019, 3 a.m. 7.8 ppb (7) 0.1 ppb (0) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 33.0 ppb (25) 0.35 ppb (4) N/A -1.0 μg/m3 (0) 25.0
 
March 17, 2019, 2 a.m. 6.4 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 2.0 ppb (3) 45.0 ppb (35) 0.31 ppb (3) N/A 0.0 μg/m3 (0) 35.0
 
March 17, 2019, 1 a.m. 4.6 ppb (4) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 2.0 ppb (3) 52.0 ppb (40) 0.28 ppb (3) N/A -2.0 μg/m3 (0) 40.0
 
March 17, 2019, midnight 4.4 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 55.0 ppb (42) 0.27 ppb (3) N/A -3.0 μg/m3 (0) 42.0
 
March 16, 2019, 11 p.m. 2.9 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 58.0 ppb (45) 0.25 ppb (3) N/A -3.0 μg/m3 (0) 45.0
 
March 16, 2019, 10 p.m. 2.3 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 58.0 ppb (45) 0.25 ppb (3) N/A -2.0 μg/m3 (0) 45.0
 
March 16, 2019, 9 p.m. 2.8 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 56.0 ppb (43) 0.28 ppb (3) N/A -3.0 μg/m3 (0) 43.0
 
March 16, 2019, 8 p.m. 3.8 ppb (4) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 51.0 ppb (39) 0.3 ppb (3) N/A -4.0 μg/m3 (0) 39.0
 
March 16, 2019, 7 p.m. 5.8 ppb (5) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 45.0 ppb (35) 0.35 ppb (4) N/A N/A 35.0
 
March 16, 2019, 6 p.m. 7.6 ppb (7) 1.7 ppb (2) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 36.0 ppb (28) 0.35 ppb (4) N/A -4.0 μg/m3 (0) 28.0
 
March 16, 2019, 5 p.m. 15.2 ppb (14) 4.7 ppb (4) N/A 10.0 ppb (9) N/A 1.0 ppb (1) 26.0 ppb (20) 0.44 ppb (5) N/A 0.0 μg/m3 (0) 20.0
 
March 16, 2019, 4 p.m. 14.5 ppb (13) 4.6 ppb (4) N/A 10.0 ppb (9) N/A 1.0 ppb (1) 21.0 ppb (16) 0.41 ppb (5) N/A -1.0 μg/m3 (0) 16.0
 
March 16, 2019, 3 p.m. 27.7 ppb (26) 11.5 ppb (11) N/A 16.0 ppb (15) N/A 1.0 ppb (1) 8.0 ppb (6) 0.37 ppb (4) N/A -3.0 μg/m3 (0) 26.0
 
March 16, 2019, 2 p.m. 27.2 ppb (25) 10.1 ppb (9) N/A 17.0 ppb (16) N/A 1.0 ppb (1) 2.0 ppb (2) 0.35 ppb (4) N/A -3.0 μg/m3 (0) 25.0
 
March 16, 2019, 1 p.m. 17.3 ppb (16) 1.7 ppb (2) N/A 16.0 ppb (15) N/A 1.0 ppb (1) 3.0 ppb (2) 0.31 ppb (3) N/A -2.0 μg/m3 (0) 16.0
 
March 16, 2019, noon 12.7 ppb (12) 0.3 ppb (0) N/A 12.0 ppb (11) N/A 1.0 ppb (1) 7.0 ppb (5) 0.31 ppb (3) N/A -1.0 μg/m3 (0) 12.0
 
March 16, 2019, 11 a.m. 11.1 ppb (10) 0.2 ppb (0) N/A 11.0 ppb (10) N/A 1.0 ppb (1) 10.0 ppb (8) 0.33 ppb (4) N/A -2.0 μg/m3 (0) 10.0
 
March 16, 2019, 10 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
March 16, 2019, 9 a.m. 7.8 ppb (7) 0.1 ppb (0) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 16.0 ppb (12) 0.31 ppb (3) N/A -1.0 μg/m3 (0) 12.0
 
March 16, 2019, 8 a.m. 6.1 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 23.0 ppb (18) 0.3 ppb (3) N/A -2.0 μg/m3 (0) 18.0
 
March 16, 2019, 7 a.m. 4.9 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 28.0 ppb (22) 0.3 ppb (3) N/A 0.0 μg/m3 (0) 22.0
 
March 16, 2019, 6 a.m. 5.3 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 30.0 ppb (23) 0.31 ppb (3) N/A 2.0 μg/m3 (8) 23.0
 
March 16, 2019, 5 a.m. 6.3 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 29.0 ppb (22) 0.33 ppb (4) N/A 2.0 μg/m3 (8) 22.0
 
March 16, 2019, 4 a.m. 8.5 ppb (8) 0.0 ppb (0) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 28.0 ppb (22) 0.37 ppb (4) N/A 0.0 μg/m3 (0) 22.0
 
March 16, 2019, 3 a.m. 9.5 ppb (9) 0.0 ppb (0) N/A 10.0 ppb (9) N/A 1.0 ppb (1) 33.0 ppb (25) 0.38 ppb (4) N/A 0.0 μg/m3 (0) 25.0
 
March 16, 2019, 2 a.m. 9.0 ppb (8) 0.4 ppb (0) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 44.0 ppb (34) 0.35 ppb (4) N/A 2.0 μg/m3 (8) 34.0
 
March 16, 2019, 1 a.m. 5.7 ppb (5) 0.5 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 53.0 ppb (41) 0.32 ppb (4) N/A 2.0 μg/m3 (8) 41.0
 
March 16, 2019, midnight 3.4 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 55.0 ppb (42) 0.28 ppb (3) N/A -1.0 μg/m3 (0) 42.0
 
March 15, 2019, 11 p.m. 2.8 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 55.0 ppb (42) 0.27 ppb (3) N/A -1.0 μg/m3 (0) 42.0
 
March 15, 2019, 10 p.m. 3.6 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 54.0 ppb (42) 0.29 ppb (3) N/A 2.0 μg/m3 (8) 42.0
 
March 15, 2019, 9 p.m. 3.9 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 52.0 ppb (40) 0.3 ppb (3) N/A 3.0 μg/m3 (12) 40.0
 
March 15, 2019, 8 p.m. 5.0 ppb (5) 0.9 ppb (1) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 50.0 ppb (38) 0.31 ppb (3) N/A 1.0 μg/m3 (4) 38.0
 
March 15, 2019, 7 p.m. 4.8 ppb (4) 0.9 ppb (1) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 45.0 ppb (35) 0.3 ppb (3) N/A 1.0 μg/m3 (4) 35.0
 
March 15, 2019, 6 p.m. 5.8 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 32.0 ppb (25) 0.29 ppb (3) N/A N/A 25.0
 
March 15, 2019, 5 p.m. 5.9 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 31.0 ppb (24) 0.27 ppb (3) N/A 4.0 μg/m3 (17) 24.0
 
March 15, 2019, 4 p.m. 21.0 ppb (19) 7.7 ppb (7) N/A 13.0 ppb (12) N/A 1.0 ppb (1) 19.0 ppb (15) 0.4 ppb (4) N/A 4.0 μg/m3 (17) 19.0
 
March 15, 2019, 3 p.m. 36.4 ppb (34) 16.0 ppb (15) N/A 21.0 ppb (19) N/A 1.0 ppb (1) 8.0 ppb (6) 0.45 ppb (5) N/A 4.0 μg/m3 (17) 34.0
 
March 15, 2019, 2 p.m. 51.8 ppb (48) 29.7 ppb (28) N/A 22.0 ppb (20) N/A 1.0 ppb (1) 1.0 ppb (1) 0.55 ppb (6) N/A 4.0 μg/m3 (17) 48.0
 
March 15, 2019, 1 p.m. 24.4 ppb (23) 5.4 ppb (5) N/A 19.0 ppb (18) N/A 1.0 ppb (1) 1.0 ppb (1) 0.29 ppb (3) N/A 4.0 μg/m3 (17) 23.0
 
March 15, 2019, noon 19.8 ppb (18) 3.0 ppb (3) N/A 17.0 ppb (16) N/A 1.0 ppb (1) 3.0 ppb (2) 0.27 ppb (3) N/A 2.0 μg/m3 (8) 18.0
 
March 15, 2019, 11 a.m. 12.1 ppb (11) 0.4 ppb (0) N/A 12.0 ppb (11) N/A 2.0 ppb (3) 10.0 ppb (8) 0.23 ppb (3) N/A 2.0 μg/m3 (8) 11.0
 
March 15, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
March 15, 2019, 9 a.m. 12.6 ppb (12) 0.5 ppb (0) N/A 12.0 ppb (11) N/A 1.0 ppb (1) 6.0 ppb (5) 0.31 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
March 15, 2019, 8 a.m. 12.9 ppb (12) 0.4 ppb (0) N/A 13.0 ppb (12) N/A 1.0 ppb (1) 8.0 ppb (6) 0.3 ppb (3) N/A 2.0 μg/m3 (8) 12.0
 
March 15, 2019, 7 a.m. 6.5 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 21.0 ppb (16) 0.24 ppb (3) N/A 1.0 μg/m3 (4) 16.0
 
March 15, 2019, 6 a.m. 4.5 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 28.0 ppb (22) 0.24 ppb (3) N/A 2.0 μg/m3 (8) 22.0
 
March 15, 2019, 5 a.m. 4.9 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 29.0 ppb (22) 0.22 ppb (2) N/A 3.0 μg/m3 (12) 22.0
 
March 15, 2019, 4 a.m. 6.2 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 28.0 ppb (22) 0.26 ppb (3) N/A 2.0 μg/m3 (8) 22.0
 
March 15, 2019, 3 a.m. 5.5 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 32.0 ppb (25) 0.25 ppb (3) N/A 0.0 μg/m3 (0) 25.0
 
March 15, 2019, 2 a.m. 7.6 ppb (7) 0.2 ppb (0) N/A 7.0 ppb (6) N/A 1.0 ppb (1) 36.0 ppb (28) 0.29 ppb (3) N/A 0.0 μg/m3 (0) 28.0
 
March 15, 2019, 1 a.m. 3.0 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 47.0 ppb (36) 0.23 ppb (3) N/A 1.0 μg/m3 (4) 36.0
 
March 15, 2019, midnight 2.6 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 48.0 ppb (37) 0.22 ppb (2) N/A 0.0 μg/m3 (0) 37.0
 
March 14, 2019, 11 p.m. 1.8 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 50.0 ppb (38) 0.2 ppb (2) N/A 3.0 μg/m3 (12) 38.0
 
March 14, 2019, 10 p.m. 2.6 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 50.0 ppb (38) 0.2 ppb (2) N/A 2.0 μg/m3 (8) 38.0
 
March 14, 2019, 9 p.m. 5.2 ppb (5) 2.5 ppb (2) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 48.0 ppb (37) 0.21 ppb (2) N/A -1.0 μg/m3 (0) 37.0
 
March 14, 2019, 8 p.m. 2.4 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 47.0 ppb (36) 0.21 ppb (2) N/A -1.0 μg/m3 (0) 36.0
 
March 14, 2019, 7 p.m. 2.1 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 44.0 ppb (34) 0.21 ppb (2) N/A 1.0 μg/m3 (4) 34.0
 
March 14, 2019, 6 p.m. 2.3 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 42.0 ppb (32) 0.23 ppb (3) N/A 2.0 μg/m3 (8) 32.0
 
March 14, 2019, 5 p.m. 2.8 ppb (3) 0.6 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 40.0 ppb (31) 0.26 ppb (3) N/A 2.0 μg/m3 (8) 31.0
 
March 14, 2019, 4 p.m. 16.6 ppb (15) 7.8 ppb (7) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 31.0 ppb (24) 0.37 ppb (4) N/A 4.0 μg/m3 (17) 24.0
 
March 14, 2019, 3 p.m. 66.3 ppb (63) 41.7 ppb (39) N/A 25.0 ppb (23) N/A 1.0 ppb (1) 4.0 ppb (3) 0.81 ppb (9) N/A 5.0 μg/m3 (21) 63.0
 
March 14, 2019, 2 p.m. 65.7 ppb (62) 42.5 ppb (39) N/A 23.0 ppb (21) N/A 1.0 ppb (1) 1.0 ppb (1) 0.58 ppb (6) N/A 3.0 μg/m3 (12) 62.0
 
March 14, 2019, 1 p.m. 33.5 ppb (31) 13.2 ppb (12) N/A 20.0 ppb (19) N/A 1.0 ppb (1) 0.0 ppb (0) 0.37 ppb (4) N/A 3.0 μg/m3 (12) 31.0
 
March 14, 2019, noon 21.1 ppb (20) 3.8 ppb (4) N/A 17.0 ppb (16) N/A 1.0 ppb (1) 1.0 ppb (1) 0.3 ppb (3) N/A 4.0 μg/m3 (17) 20.0
 
March 14, 2019, 11 a.m. 15.8 ppb (15) 0.9 ppb (1) N/A 15.0 ppb (14) N/A 1.0 ppb (1) 4.0 ppb (3) 0.28 ppb (3) N/A N/A 15.0
 
March 14, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
March 14, 2019, 9 a.m. 13.7 ppb (13) 0.6 ppb (1) N/A 13.0 ppb (12) N/A 1.0 ppb (1) 5.0 ppb (4) 0.36 ppb (4) N/A N/A 13.0
 
March 14, 2019, 8 a.m. 12.4 ppb (11) 0.4 ppb (0) N/A 12.0 ppb (11) N/A 1.0 ppb (1) 7.0 ppb (5) 0.35 ppb (4) N/A N/A 11.0
 
March 14, 2019, 7 a.m. 8.4 ppb (8) 0.1 ppb (0) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 15.0 ppb (12) 0.29 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
March 14, 2019, 6 a.m. 6.6 ppb (6) 0.1 ppb (0) N/A 7.0 ppb (6) N/A 1.0 ppb (1) 19.0 ppb (15) 0.28 ppb (3) N/A 1.0 μg/m3 (4) 15.0
 
March 14, 2019, 5 a.m. 7.6 ppb (7) 0.1 ppb (0) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 20.0 ppb (15) 0.28 ppb (3) N/A 2.0 μg/m3 (8) 15.0
 
March 14, 2019, 4 a.m. 9.6 ppb (9) 0.1 ppb (0) N/A 10.0 ppb (9) N/A 1.0 ppb (1) 22.0 ppb (17) 0.34 ppb (4) N/A 3.0 μg/m3 (12) 17.0
 
March 14, 2019, 3 a.m. 6.1 ppb (6) 0.4 ppb (0) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 30.0 ppb (23) 0.3 ppb (3) N/A 2.0 μg/m3 (8) 23.0
 
March 14, 2019, 2 a.m. 6.7 ppb (6) 0.4 ppb (0) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 36.0 ppb (28) 0.29 ppb (3) N/A 1.0 μg/m3 (4) 28.0
 
March 14, 2019, 1 a.m. 4.7 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 45.0 ppb (35) 0.27 ppb (3) N/A 2.0 μg/m3 (8) 35.0
 
March 14, 2019, midnight 3.1 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 49.0 ppb (38) 0.27 ppb (3) N/A 1.0 μg/m3 (4) 38.0
 
March 13, 2019, 11 p.m. 2.6 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 49.0 ppb (38) 0.27 ppb (3) N/A 0.0 μg/m3 (0) 38.0
 
March 13, 2019, 10 p.m. 2.3 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 49.0 ppb (38) 0.26 ppb (3) N/A -1.0 μg/m3 (0) 38.0
 
March 13, 2019, 9 p.m. 2.9 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 45.0 ppb (35) 0.25 ppb (3) N/A -1.0 μg/m3 (0) 35.0
 
March 13, 2019, 8 p.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
March 13, 2019, 7 p.m. 2.9 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 43.0 ppb (33) 0.23 ppb (3) N/A -1.0 μg/m3 (0) 33.0
 
March 13, 2019, 6 p.m. 2.7 ppb (3) 0.6 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 42.0 ppb (32) 0.23 ppb (3) N/A 0.0 μg/m3 (0) 32.0
 
March 13, 2019, 5 p.m. 12.7 ppb (12) 4.3 ppb (4) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 33.0 ppb (25) 0.29 ppb (3) N/A -1.0 μg/m3 (0) 25.0
 
March 13, 2019, 4 p.m. 14.0 ppb (13) 4.7 ppb (4) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 25.0 ppb (19) 0.3 ppb (3) N/A 2.0 μg/m3 (8) 19.0
 
March 13, 2019, 3 p.m. 30.7 ppb (28) 12.3 ppb (11) N/A 18.0 ppb (17) N/A 1.0 ppb (1) 11.0 ppb (8) 0.38 ppb (4) N/A 4.0 μg/m3 (17) 28.0
 
March 13, 2019, 2 p.m. 31.4 ppb (29) 8.3 ppb (8) N/A 23.0 ppb (21) N/A 1.0 ppb (1) 4.0 ppb (3) 0.37 ppb (4) N/A 1.0 μg/m3 (4) 29.0
 
March 13, 2019, 1 p.m. 17.6 ppb (16) 1.0 ppb (1) N/A 17.0 ppb (16) N/A 1.0 ppb (1) 7.0 ppb (5) 0.28 ppb (3) N/A 0.0 μg/m3 (0) 16.0
 
March 13, 2019, noon 11.9 ppb (11) 0.4 ppb (0) N/A 12.0 ppb (11) N/A 1.0 ppb (1) 13.0 ppb (10) 0.23 ppb (3) N/A 1.0 μg/m3 (4) 11.0
 
March 13, 2019, 11 a.m. 9.1 ppb (8) 0.3 ppb (0) N/A 9.0 ppb (8) N/A 2.0 ppb (3) 16.0 ppb (12) 0.22 ppb (2) N/A 0.0 μg/m3 (0) 12.0
 
March 13, 2019, 10 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
March 13, 2019, 9 a.m. 4.6 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 24.0 ppb (18) 0.22 ppb (2) N/A 0.0 μg/m3 (0) 18.0
 
March 13, 2019, 8 a.m. 5.1 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 24.0 ppb (18) 0.21 ppb (2) N/A 2.0 μg/m3 (8) 18.0
 
March 13, 2019, 7 a.m. 5.9 ppb (5) 0.2 ppb (0) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 25.0 ppb (19) 0.23 ppb (3) N/A 1.0 μg/m3 (4) 19.0
 
March 13, 2019, 6 a.m. 2.9 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 36.0 ppb (28) 0.21 ppb (2) N/A 2.0 μg/m3 (8) 28.0
 
March 13, 2019, 5 a.m. 2.4 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 38.0 ppb (29) 0.22 ppb (2) N/A 4.0 μg/m3 (17) 29.0
 
March 13, 2019, 4 a.m. 2.3 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 39.0 ppb (30) 0.22 ppb (2) N/A 4.0 μg/m3 (17) 30.0
 
March 13, 2019, 3 a.m. 2.2 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 40.0 ppb (31) 0.22 ppb (2) N/A 3.0 μg/m3 (12) 31.0
 
March 13, 2019, 2 a.m. 2.2 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 41.0 ppb (32) 0.22 ppb (2) N/A 2.0 μg/m3 (8) 32.0
 
March 13, 2019, 1 a.m. 2.1 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 42.0 ppb (32) 0.23 ppb (3) N/A 4.0 μg/m3 (17) 32.0
 
March 13, 2019, midnight 1.7 ppb (2) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 44.0 ppb (34) 0.22 ppb (2) N/A 4.0 μg/m3 (17) 34.0
 
March 12, 2019, 11 p.m. 1.9 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 45.0 ppb (35) 0.21 ppb (2) N/A 3.0 μg/m3 (12) 35.0
 
March 12, 2019, 10 p.m. 1.7 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 47.0 ppb (36) 0.21 ppb (2) N/A 4.0 μg/m3 (17) 36.0
 
March 12, 2019, 9 p.m. 1.7 ppb (2) 0.5 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 43.0 ppb (33) 0.23 ppb (3) N/A -1.0 μg/m3 (0) 33.0
 
March 12, 2019, 8 p.m. 1.6 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 39.0 ppb (30) 0.22 ppb (2) N/A -1.0 μg/m3 (0) 30.0
 
March 12, 2019, 7 p.m. 1.7 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 39.0 ppb (30) 0.25 ppb (3) N/A 2.0 μg/m3 (8) 30.0
 
March 12, 2019, 6 p.m. 1.8 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 40.0 ppb (31) 0.22 ppb (2) N/A 2.0 μg/m3 (8) 31.0
 
March 12, 2019, 5 p.m. 3.2 ppb (3) 0.6 ppb (1) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 38.0 ppb (29) 0.19 ppb (2) N/A 4.0 μg/m3 (17) 29.0
 
March 12, 2019, 4 p.m. 6.8 ppb (6) 1.5 ppb (1) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 29.0 ppb (22) 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 12, 2019, 3 p.m. 14.0 ppb (13) 3.9 ppb (4) N/A 10.0 ppb (9) N/A 1.0 ppb (1) 18.0 ppb (14) 0.3 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
March 12, 2019, 2 p.m. 19.6 ppb (18) 2.5 ppb (2) N/A 17.0 ppb (16) N/A 1.0 ppb (1) 8.0 ppb (6) 0.32 ppb (4) N/A 0.0 μg/m3 (0) 18.0
 
March 12, 2019, 1 p.m. 13.3 ppb (12) 0.6 ppb (1) N/A 13.0 ppb (12) N/A 1.0 ppb (1) 11.0 ppb (8) 0.24 ppb (3) N/A 2.0 μg/m3 (8) 12.0
 
March 12, 2019, noon 9.5 ppb (9) 0.5 ppb (0) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 15.0 ppb (12) 0.22 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 12, 2019, 11 a.m. 5.6 ppb (5) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 17.0 ppb (13) 0.19 ppb (2) N/A 3.0 μg/m3 (12) 13.0
 
March 12, 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
 
March 12, 2019, 9 a.m. 3.2 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 23.0 ppb (18) 0.18 ppb (2) N/A 3.0 μg/m3 (12) 18.0
 
March 12, 2019, 8 a.m. 2.8 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 25.0 ppb (19) 0.18 ppb (2) N/A 3.0 μg/m3 (12) 19.0
 
March 12, 2019, 7 a.m. 4.5 ppb (4) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 22.0 ppb (17) 0.19 ppb (2) N/A 1.0 μg/m3 (4) 17.0
 
March 12, 2019, 6 a.m. 3.7 ppb (3) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 23.0 ppb (18) 0.2 ppb (2) N/A 0.0 μg/m3 (0) 18.0
 
March 12, 2019, 5 a.m. 4.4 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 24.0 ppb (18) 0.21 ppb (2) N/A 0.0 μg/m3 (0) 18.0
 
March 12, 2019, 4 a.m. 6.6 ppb (6) 0.0 ppb (0) N/A 7.0 ppb (6) N/A 1.0 ppb (1) 23.0 ppb (18) 0.26 ppb (3) N/A 2.0 μg/m3 (8) 18.0
 
March 12, 2019, 3 a.m. 5.2 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 30.0 ppb (23) 0.24 ppb (3) N/A 0.0 μg/m3 (0) 23.0
 
March 12, 2019, 2 a.m. 3.2 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 36.0 ppb (28) 0.22 ppb (2) N/A -1.0 μg/m3 (0) 28.0
 
March 12, 2019, 1 a.m. 3.5 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 42.0 ppb (32) 0.2 ppb (2) N/A 1.0 μg/m3 (4) 32.0
 
March 12, 2019, midnight 4.1 ppb (4) 0.5 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 42.0 ppb (32) 0.21 ppb (2) N/A 0.0 μg/m3 (0) 32.0
 
March 11, 2019, 11 p.m. 3.2 ppb (3) 0.5 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 43.0 ppb (33) 0.19 ppb (2) N/A 0.0 μg/m3 (0) 33.0
 
March 11, 2019, 10 p.m. 2.4 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (33) 0.18 ppb (2) N/A 0.0 μg/m3 (0) 33.0
 
March 11, 2019, 9 p.m. 2.3 ppb (2) 0.4 ppb (0) N/A N/A N/A 1.0 ppb (1) 41.0 ppb (32) 0.2 ppb (2) N/A -1.0 μg/m3 (0) 32.0
 
March 11, 2019, 8 p.m. 73.1 ppb (70) 34.4 ppb (32) N/A N/A N/A 40.0 ppb (52) 23.0 ppb (18) 4.07 ppb (45) N/A 0.0 μg/m3 (0) 70.0
 
March 11, 2019, 7 p.m. 485.4 ppb (172) 332.1 ppb (144) N/A N/A N/A N/A 4.0 ppb (3) N/A N/A 1.0 μg/m3 (4) 172.0
 
March 11, 2019, 6 p.m. 66.1 ppb (63) 66.0 ppb (63) N/A 0.0 ppb (0) N/A 31.0 ppb (44) N/A 0.06 ppb (1) N/A 2.0 μg/m3 (8) 63.0
 
March 11, 2019, 5 p.m. 0.9 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.07 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
March 11, 2019, 4 p.m. 21.7 ppb (20) 9.8 ppb (9) N/A 12.0 ppb (11) N/A 1.0 ppb (1) 15.0 ppb (12) 0.44 ppb (5) N/A 3.0 μg/m3 (12) 20.0
 
March 11, 2019, 3 p.m. 41.9 ppb (39) 25.8 ppb (24) N/A 16.0 ppb (15) N/A 1.0 ppb (1) 4.0 ppb (3) 0.51 ppb (6) N/A 2.0 μg/m3 (8) 39.0
 
March 11, 2019, 2 p.m. 40.2 ppb (37) 25.9 ppb (24) N/A 14.0 ppb (13) N/A 1.0 ppb (1) 0.0 ppb (0) 0.4 ppb (4) N/A 0.0 μg/m3 (0) 37.0
 
March 11, 2019, 1 p.m. 29.7 ppb (28) 16.1 ppb (15) N/A 14.0 ppb (13) N/A 1.0 ppb (1) 0.0 ppb (0) 0.33 ppb (4) N/A 3.0 μg/m3 (12) 28.0