AQSQID: 060130002

Site Name: Concord

Location: Concord, CA

Reporting: True, Located: True

Current AQI: 4.0

Concord CA, US: 37.9383, -122.025

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Jan. 24, 2019, midnight N/A N/A N/A N/A N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
Jan. 23, 2019, 11 p.m. 5.2 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 31.0 ppb (24) 0.41 ppb (5) N/A 4.0 μg/m3 (17) 24.0
 
Jan. 23, 2019, 10 p.m. 4.2 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 31.0 ppb (24) 0.42 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 23, 2019, 9 p.m. 5.0 ppb (5) 1.4 ppb (1) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 28.0 ppb (22) 0.44 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 23, 2019, 8 p.m. 8.4 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 23.0 ppb (18) 0.49 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 23, 2019, 7 p.m. 14.9 ppb (14) 6.9 ppb (6) N/A 8.0 ppb (7) N/A 2.0 ppb (3) 14.0 ppb (11) 0.55 ppb (6) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 23, 2019, 6 p.m. 35.1 ppb (32) 19.5 ppb (18) N/A 16.0 ppb (15) N/A 4.0 ppb (6) 8.0 ppb (6) 0.7 ppb (8) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 23, 2019, 5 p.m. 48.7 ppb (45) 30.1 ppb (28) N/A 19.0 ppb (18) N/A 1.0 ppb (1) 4.0 ppb (3) 0.73 ppb (8) N/A 6.0 μg/m3 (25) 45.0
 
Jan. 23, 2019, 4 p.m. 74.0 ppb (71) 53.3 ppb (49) N/A 21.0 ppb (19) N/A 1.0 ppb (1) 1.0 ppb (1) 0.84 ppb (9) N/A 6.0 μg/m3 (25) 71.0
 
Jan. 23, 2019, 3 p.m. 54.7 ppb (51) 35.8 ppb (33) N/A 19.0 ppb (18) N/A 1.0 ppb (1) -1.0 ppb (0) 0.68 ppb (8) N/A 4.0 μg/m3 (17) 51.0
 
Jan. 23, 2019, 2 p.m. 47.0 ppb (44) 30.5 ppb (28) N/A 17.0 ppb (16) N/A 1.0 ppb (1) -1.0 ppb (0) 0.59 ppb (7) N/A 2.0 μg/m3 (8) 44.0
 
Jan. 23, 2019, 1 p.m. 31.8 ppb (29) 16.5 ppb (15) N/A 15.0 ppb (14) N/A 1.0 ppb (1) -1.0 ppb (0) 0.47 ppb (5) N/A 0.0 μg/m3 (0) 29.0
 
Jan. 23, 2019, noon 22.7 ppb (21) 7.6 ppb (7) N/A 15.0 ppb (14) N/A 1.0 ppb (1) -1.0 ppb (0) 0.43 ppb (5) N/A 1.0 μg/m3 (4) 21.0
 
Jan. 23, 2019, 11 a.m. 18.7 ppb (17) 4.5 ppb (4) N/A 14.0 ppb (13) N/A 1.0 ppb (1) 0.0 ppb (0) 0.45 ppb (5) N/A 3.0 μg/m3 (12) 17.0
 
Jan. 23, 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
 
Jan. 23, 2019, 9 a.m. 18.9 ppb (18) 3.9 ppb (4) N/A 15.0 ppb (14) N/A 1.0 ppb (1) 0.0 ppb (0) 0.48 ppb (5) N/A 3.0 μg/m3 (12) 18.0
 
Jan. 23, 2019, 8 a.m. 18.6 ppb (17) 2.9 ppb (3) N/A 16.0 ppb (15) N/A 1.0 ppb (1) 0.0 ppb (0) 0.48 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 23, 2019, 7 a.m. 24.2 ppb (22) 6.3 ppb (6) N/A 18.0 ppb (17) N/A 1.0 ppb (1) 1.0 ppb (1) 0.57 ppb (6) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 23, 2019, 6 a.m. 23.4 ppb (22) 4.2 ppb (4) N/A 19.0 ppb (18) N/A 1.0 ppb (1) 0.0 ppb (0) 0.56 ppb (6) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 23, 2019, 5 a.m. 16.6 ppb (15) 1.0 ppb (1) N/A 16.0 ppb (15) N/A 1.0 ppb (1) 5.0 ppb (4) 0.45 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 23, 2019, 4 a.m. 40.6 ppb (38) 16.3 ppb (15) N/A 24.0 ppb (22) N/A 1.0 ppb (1) 0.0 ppb (0) 0.78 ppb (9) N/A 8.0 μg/m3 (33) 38.0
 
Jan. 23, 2019, 3 a.m. 32.1 ppb (30) 6.5 ppb (6) N/A 26.0 ppb (24) N/A 1.0 ppb (1) 3.0 ppb (2) 0.62 ppb (7) N/A 6.0 μg/m3 (25) 30.0
 
Jan. 23, 2019, 2 a.m. 11.8 ppb (11) 1.0 ppb (1) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 20.0 ppb (15) 0.41 ppb (5) N/A 3.0 μg/m3 (12) 15.0
 
Jan. 23, 2019, 1 a.m. 7.5 ppb (7) 0.6 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 26.0 ppb (20) 0.32 ppb (4) N/A 1.0 μg/m3 (4) 20.0
 
Jan. 23, 2019, midnight 3.0 ppb (3) 0.5 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 32.0 ppb (25) 0.26 ppb (3) N/A 3.0 μg/m3 (12) 25.0
 
Jan. 22, 2019, 11 p.m. 3.4 ppb (3) 0.8 ppb (1) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 33.0 ppb (25) 0.26 ppb (3) N/A 3.0 μg/m3 (12) 25.0
 
Jan. 22, 2019, 10 p.m. 4.8 ppb (4) 1.2 ppb (1) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 32.0 ppb (25) 0.26 ppb (3) N/A 3.0 μg/m3 (12) 25.0
 
Jan. 22, 2019, 9 p.m. 5.4 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 32.0 ppb (25) 0.27 ppb (3) N/A 2.0 μg/m3 (8) 25.0
 
Jan. 22, 2019, 8 p.m. 3.5 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 33.0 ppb (25) 0.3 ppb (3) N/A 1.0 μg/m3 (4) 25.0
 
Jan. 22, 2019, 7 p.m. 3.7 ppb (3) 1.3 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 31.0 ppb (24) 0.28 ppb (3) N/A 0.0 μg/m3 (0) 24.0
 
Jan. 22, 2019, 6 p.m. 16.1 ppb (15) 6.6 ppb (6) N/A 10.0 ppb (9) N/A 1.0 ppb (1) 21.0 ppb (16) 0.41 ppb (5) N/A 2.0 μg/m3 (8) 16.0
 
Jan. 22, 2019, 5 p.m. 80.1 ppb (78) 57.5 ppb (54) N/A 23.0 ppb (21) N/A 1.0 ppb (1) 1.0 ppb (1) 0.93 ppb (10) N/A 5.0 μg/m3 (21) 78.0
 
Jan. 22, 2019, 4 p.m. 87.7 ppb (86) 66.9 ppb (64) N/A 21.0 ppb (19) N/A 1.0 ppb (1) 0.0 ppb (0) 0.85 ppb (9) N/A 6.0 μg/m3 (25) 86.0
 
Jan. 22, 2019, 3 p.m. 69.6 ppb (67) 52.3 ppb (48) N/A 17.0 ppb (16) N/A 1.0 ppb (1) -1.0 ppb (0) 0.7 ppb (8) N/A 2.0 μg/m3 (8) 67.0
 
Jan. 22, 2019, 2 p.m. 51.8 ppb (48) 34.3 ppb (32) N/A 18.0 ppb (17) N/A 1.0 ppb (1) -1.0 ppb (0) 0.43 ppb (5) N/A 1.0 μg/m3 (4) 48.0
 
Jan. 22, 2019, 1 p.m. 30.7 ppb (28) 19.3 ppb (18) N/A 11.0 ppb (10) N/A 1.0 ppb (1) -1.0 ppb (0) 0.35 ppb (4) N/A 1.0 μg/m3 (4) 28.0
 
Jan. 22, 2019, noon 22.8 ppb (21) 11.9 ppb (11) N/A 11.0 ppb (10) N/A 1.0 ppb (1) -1.0 ppb (0) 0.33 ppb (4) N/A 2.0 μg/m3 (8) 21.0
 
Jan. 22, 2019, 11 a.m. 18.3 ppb (17) 7.7 ppb (7) N/A 11.0 ppb (10) N/A 2.0 ppb (3) -1.0 ppb (0) 0.33 ppb (4) N/A 3.0 μg/m3 (12) 17.0
 
Jan. 22, 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
 
Jan. 22, 2019, 9 a.m. 12.4 ppb (11) 2.6 ppb (2) N/A 10.0 ppb (9) N/A 0.0 ppb (0) 0.0 ppb (0) 0.32 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 22, 2019, 8 a.m. 11.3 ppb (10) 1.5 ppb (1) N/A 10.0 ppb (9) N/A 0.0 ppb (0) 1.0 ppb (1) 0.34 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 22, 2019, 7 a.m. 9.9 ppb (9) 0.4 ppb (0) N/A 10.0 ppb (9) N/A 0.0 ppb (0) 3.0 ppb (2) 0.34 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 22, 2019, 6 a.m. 12.6 ppb (12) 0.7 ppb (1) N/A 12.0 ppb (11) N/A 0.0 ppb (0) 3.0 ppb (2) 0.39 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 22, 2019, 5 a.m. 11.2 ppb (10) 0.3 ppb (0) N/A 11.0 ppb (10) N/A 1.0 ppb (1) 6.0 ppb (5) 0.35 ppb (4) N/A 2.0 μg/m3 (8) 10.0
 
Jan. 22, 2019, 4 a.m. 10.7 ppb (10) 0.1 ppb (0) N/A 11.0 ppb (10) N/A 1.0 ppb (1) 9.0 ppb (7) 0.34 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 22, 2019, 3 a.m. 10.2 ppb (9) 0.1 ppb (0) N/A 10.0 ppb (9) N/A 1.0 ppb (1) 12.0 ppb (9) 0.35 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 22, 2019, 2 a.m. 14.7 ppb (14) 0.1 ppb (0) N/A 15.0 ppb (14) N/A 1.0 ppb (1) 12.0 ppb (9) 0.41 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 22, 2019, 1 a.m. 7.8 ppb (7) 0.1 ppb (0) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 26.0 ppb (20) 0.33 ppb (4) N/A 1.0 μg/m3 (4) 20.0
 
Jan. 22, 2019, midnight 5.4 ppb (5) 0.5 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 33.0 ppb (25) 0.27 ppb (3) N/A 2.0 μg/m3 (8) 25.0
 
Jan. 21, 2019, 11 p.m. 3.8 ppb (4) 0.7 ppb (1) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 35.0 ppb (27) 0.25 ppb (3) N/A 2.0 μg/m3 (8) 27.0
 
Jan. 21, 2019, 10 p.m. 1.9 ppb (2) 0.5 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 37.0 ppb (28) 0.23 ppb (3) N/A 0.0 μg/m3 (0) 28.0
 
Jan. 21, 2019, 9 p.m. 1.1 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 36.0 ppb (28) 0.23 ppb (3) N/A 1.0 μg/m3 (4) 28.0
 
Jan. 21, 2019, 8 p.m. 0.9 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 36.0 ppb (28) 0.23 ppb (3) N/A 1.0 μg/m3 (4) 28.0
 
Jan. 21, 2019, 7 p.m. 1.6 ppb (1) 0.6 ppb (1) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 35.0 ppb (27) 0.24 ppb (3) N/A 0.0 μg/m3 (0) 27.0
 
Jan. 21, 2019, 6 p.m. 1.5 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 35.0 ppb (27) 0.24 ppb (3) N/A 1.0 μg/m3 (4) 27.0
 
Jan. 21, 2019, 5 p.m. 2.8 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (25) 0.25 ppb (3) N/A 3.0 μg/m3 (12) 25.0
 
Jan. 21, 2019, 4 p.m. 11.4 ppb (11) 2.1 ppb (2) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 21.0 ppb (16) 0.28 ppb (3) N/A 2.0 μg/m3 (8) 16.0
 
Jan. 21, 2019, 3 p.m. 11.9 ppb (11) 0.6 ppb (1) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 21.0 ppb (16) 0.26 ppb (3) N/A 0.0 μg/m3 (0) 16.0
 
Jan. 21, 2019, 2 p.m. 5.6 ppb (5) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (22) 0.25 ppb (3) N/A 2.0 μg/m3 (8) 22.0
 
Jan. 21, 2019, 1 p.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 29.0 ppb (22) 0.23 ppb (3) N/A 3.0 μg/m3 (12) 22.0
 
Jan. 21, 2019, noon 2.5 ppb (2) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 32.0 ppb (25) 0.22 ppb (2) N/A 3.0 μg/m3 (12) 25.0
 
Jan. 21, 2019, 11 a.m. 1.6 ppb (1) -0.1 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 35.0 ppb (27) 0.22 ppb (2) N/A 3.0 μg/m3 (12) 27.0
 
Jan. 21, 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 (4) 4.0
 
Jan. 21, 2019, 9 a.m. 0.1 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 38.0 ppb (29) 0.22 ppb (2) N/A 0.0 μg/m3 (0) 29.0
 
Jan. 21, 2019, 8 a.m. 0.7 ppb (1) -0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 37.0 ppb (28) 0.23 ppb (3) N/A 2.0 μg/m3 (8) 28.0
 
Jan. 21, 2019, 7 a.m. 1.0 ppb (1) -0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 36.0 ppb (28) 0.24 ppb (3) N/A 3.0 μg/m3 (12) 28.0
 
Jan. 21, 2019, 6 a.m. 0.5 ppb (0) -0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 38.0 ppb (29) 0.24 ppb (3) N/A 2.0 μg/m3 (8) 29.0
 
Jan. 21, 2019, 5 a.m. 0.5 ppb (0) -0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 39.0 ppb (30) 0.24 ppb (3) N/A 1.0 μg/m3 (4) 30.0
 
Jan. 21, 2019, 4 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 36.0 ppb (28) 0.26 ppb (3) N/A -1.0 μg/m3 (0) 28.0
 
Jan. 21, 2019, 3 a.m. 0.8 ppb (1) -0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 38.0 ppb (29) 0.25 ppb (3) N/A -3.0 μg/m3 (0) 29.0
 
Jan. 21, 2019, 2 a.m. 0.2 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 39.0 ppb (30) 0.25 ppb (3) N/A 0.0 μg/m3 (0) 30.0
 
Jan. 21, 2019, 1 a.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 38.0 ppb (29) 0.26 ppb (3) N/A 2.0 μg/m3 (8) 29.0
 
Jan. 21, 2019, midnight 1.1 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 39.0 ppb (30) 0.26 ppb (3) N/A -1.0 μg/m3 (0) 30.0
 
Jan. 20, 2019, 11 p.m. 1.8 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 38.0 ppb (29) 0.26 ppb (3) N/A -2.0 μg/m3 (0) 29.0
 
Jan. 20, 2019, 10 p.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A 1.0 ppb (1) 39.0 ppb (30) 0.26 ppb (3) N/A -2.0 μg/m3 (0) 30.0
 
Jan. 20, 2019, 9 p.m. 0.6 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 37.0 ppb (28) 0.28 ppb (3) N/A 0.0 μg/m3 (0) 28.0
 
Jan. 20, 2019, 8 p.m. 0.3 ppb (0) 0.1 ppb (0) N/A 0.0 ppb (0) N/A 1.0 ppb (1) 34.0 ppb (26) 0.28 ppb (3) N/A -1.0 μg/m3 (0) 26.0
 
Jan. 20, 2019, 7 p.m. 1.1 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 23.0 ppb (18) 0.28 ppb (3) N/A -1.0 μg/m3 (0) 18.0
 
Jan. 20, 2019, 6 p.m. 0.5 ppb (0) 0.2 ppb (0) N/A 0.0 ppb (0) N/A 1.0 ppb (1) 25.0 ppb (19) 0.27 ppb (3) N/A -2.0 μg/m3 (0) 19.0
 
Jan. 20, 2019, 5 p.m. 0.8 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 23.0 ppb (18) 0.28 ppb (3) N/A -4.0 μg/m3 (0) 18.0
 
Jan. 20, 2019, 4 p.m. 0.7 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 21.0 ppb (16) 0.27 ppb (3) N/A 0.0 μg/m3 (0) 16.0
 
Jan. 20, 2019, 3 p.m. 0.8 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 19.0 ppb (15) 0.27 ppb (3) N/A 3.0 μg/m3 (12) 15.0
 
Jan. 20, 2019, 2 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 16.0 ppb (12) 0.29 ppb (3) N/A 1.0 μg/m3 (4) 12.0
 
Jan. 20, 2019, 1 p.m. 3.2 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 15.0 ppb (12) 0.32 ppb (4) N/A 0.0 μg/m3 (0) 12.0
 
Jan. 20, 2019, noon 5.5 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 11.0 ppb (8) 0.37 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 20, 2019, 11 a.m. 7.7 ppb (7) 0.1 ppb (0) N/A 8.0 ppb (7) N/A 3.0 ppb (4) 6.0 ppb (5) 0.44 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 20, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 20, 2019, 9 a.m. 8.3 ppb (8) 0.1 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 5.0 ppb (4) 0.49 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 20, 2019, 8 a.m. 7.3 ppb (7) 0.1 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 6.0 ppb (5) 0.47 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 20, 2019, 7 a.m. 10.5 ppb (10) 0.9 ppb (1) N/A 10.0 ppb (9) N/A 0.0 ppb (0) 2.0 ppb (2) 0.54 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 20, 2019, 6 a.m. 11.0 ppb (10) 2.1 ppb (2) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 1.0 ppb (1) 0.58 ppb (6) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 20, 2019, 5 a.m. 7.0 ppb (6) 0.2 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 3.0 ppb (2) 0.45 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 20, 2019, 4 a.m. 6.3 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 6.0 ppb (5) 0.45 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 20, 2019, 3 a.m. 10.0 ppb (9) 0.2 ppb (0) N/A 10.0 ppb (9) N/A 0.0 ppb (0) 4.0 ppb (3) 0.53 ppb (6) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 20, 2019, 2 a.m. 11.3 ppb (10) 0.1 ppb (0) N/A 11.0 ppb (10) N/A 1.0 ppb (1) 8.0 ppb (6) 0.56 ppb (6) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 20, 2019, 1 a.m. 12.9 ppb (12) 1.4 ppb (1) N/A 12.0 ppb (11) N/A 1.0 ppb (1) 16.0 ppb (12) 0.54 ppb (6) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 20, 2019, midnight 6.9 ppb (6) 0.6 ppb (1) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 24.0 ppb (18) 0.42 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2019, 11 p.m. 4.1 ppb (4) 0.6 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 28.0 ppb (22) 0.37 ppb (4) N/A 5.0 μg/m3 (21) 22.0
 
Jan. 19, 2019, 10 p.m. 3.4 ppb (3) 0.8 ppb (1) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 28.0 ppb (22) 0.35 ppb (4) N/A 3.0 μg/m3 (12) 22.0
 
Jan. 19, 2019, 9 p.m. 8.4 ppb (8) 2.5 ppb (2) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 23.0 ppb (18) 0.4 ppb (4) N/A 3.0 μg/m3 (12) 18.0
 
Jan. 19, 2019, 8 p.m. 10.1 ppb (9) 3.6 ppb (3) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 20.0 ppb (15) 0.43 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2019, 7 p.m. 8.1 ppb (8) 3.2 ppb (3) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 17.0 ppb (13) 0.44 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 19, 2019, 6 p.m. 9.4 ppb (9) 3.5 ppb (3) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 13.0 ppb (10) 0.44 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 19, 2019, 5 p.m. 9.8 ppb (9) 2.7 ppb (3) N/A 7.0 ppb (6) N/A 1.0 ppb (1) 9.0 ppb (7) 0.44 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2019, 4 p.m. 12.4 ppb (11) 3.2 ppb (3) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 5.0 ppb (4) 0.47 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2019, 3 p.m. 14.3 ppb (13) 2.4 ppb (2) N/A 12.0 ppb (11) N/A 1.0 ppb (1) 1.0 ppb (1) 0.5 ppb (6) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2019, 2 p.m. 10.6 ppb (10) 0.3 ppb (0) N/A 10.0 ppb (9) N/A 1.0 ppb (1) 2.0 ppb (2) 0.45 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2019, 1 p.m. 11.9 ppb (11) 0.7 ppb (1) N/A 11.0 ppb (10) N/A 1.0 ppb (1) 1.0 ppb (1) 0.48 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2019, noon 11.8 ppb (11) 0.3 ppb (0) N/A 12.0 ppb (11) N/A 1.0 ppb (1) 3.0 ppb (2) 0.47 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2019, 11 a.m. 11.3 ppb (10) 0.2 ppb (0) N/A 11.0 ppb (10) N/A 1.0 ppb (1) 5.0 ppb (4) 0.48 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 19, 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
 
Jan. 19, 2019, 9 a.m. 8.9 ppb (8) 0.0 ppb (0) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 7.0 ppb (5) 0.42 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2019, 8 a.m. 9.5 ppb (9) 0.0 ppb (0) N/A 10.0 ppb (9) N/A 1.0 ppb (1) 9.0 ppb (7) 0.41 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 19, 2019, 7 a.m. 9.4 ppb (9) 0.0 ppb (0) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 11.0 ppb (8) 0.41 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2019, 6 a.m. 8.1 ppb (8) 0.0 ppb (0) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 16.0 ppb (12) 0.39 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 19, 2019, 5 a.m. 13.6 ppb (13) 0.3 ppb (0) N/A 13.0 ppb (12) N/A 1.0 ppb (1) 9.0 ppb (7) 0.52 ppb (6) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 19, 2019, 4 a.m. 13.1 ppb (12) 0.6 ppb (1) N/A 13.0 ppb (12) N/A 1.0 ppb (1) 6.0 ppb (5) 0.53 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 19, 2019, 3 a.m. 13.0 ppb (12) 0.3 ppb (0) N/A 13.0 ppb (12) N/A 1.0 ppb (1) 8.0 ppb (6) 0.48 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 19, 2019, 2 a.m. 15.6 ppb (14) 0.9 ppb (1) N/A 15.0 ppb (14) N/A 1.0 ppb (1) 11.0 ppb (8) 0.54 ppb (6) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 19, 2019, 1 a.m. 8.4 ppb (8) 0.4 ppb (0) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 22.0 ppb (17) 0.44 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2019, midnight 6.3 ppb (6) 0.6 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 27.0 ppb (21) 0.35 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2019, 11 p.m. 2.4 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 35.0 ppb (27) 0.28 ppb (3) N/A 3.0 μg/m3 (12) 27.0
 
Jan. 18, 2019, 10 p.m. 0.9 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 37.0 ppb (28) 0.24 ppb (3) N/A 5.0 μg/m3 (21) 28.0
 
Jan. 18, 2019, 9 p.m. 2.1 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (25) 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2019, 8 p.m. 4.6 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 28.0 ppb (22) 0.29 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 18, 2019, 7 p.m. 8.8 ppb (8) 2.6 ppb (2) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 23.0 ppb (18) 0.33 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2019, 6 p.m. 17.0 ppb (16) 6.3 ppb (6) N/A 11.0 ppb (10) N/A 1.0 ppb (1) 15.0 ppb (12) 0.42 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 18, 2019, 5 p.m. 35.5 ppb (33) 18.9 ppb (18) N/A 17.0 ppb (16) N/A 1.0 ppb (1) 4.0 ppb (3) 0.67 ppb (7) N/A 6.0 μg/m3 (25) 33.0
 
Jan. 18, 2019, 4 p.m. 28.9 ppb (27) 12.4 ppb (11) N/A 17.0 ppb (16) N/A 1.0 ppb (1) 2.0 ppb (2) 0.56 ppb (6) N/A 5.0 μg/m3 (21) 27.0
 
Jan. 18, 2019, 3 p.m. 26.6 ppb (25) 9.7 ppb (9) N/A 17.0 ppb (16) N/A 1.0 ppb (1) 0.0 ppb (0) 0.47 ppb (5) N/A 3.0 μg/m3 (12) 25.0
 
Jan. 18, 2019, 2 p.m. 19.1 ppb (18) 4.5 ppb (4) N/A 15.0 ppb (14) N/A 1.0 ppb (1) 0.0 ppb (0) 0.44 ppb (5) N/A 4.0 μg/m3 (17) 18.0
 
Jan. 18, 2019, 1 p.m. 14.5 ppb (13) 2.0 ppb (2) N/A 13.0 ppb (12) N/A 1.0 ppb (1) 2.0 ppb (2) 0.38 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 18, 2019, noon 8.6 ppb (8) 0.4 ppb (0) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 5.0 ppb (4) 0.34 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 18, 2019, 11 a.m. 8.2 ppb (8) 0.1 ppb (0) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 6.0 ppb (5) 0.36 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 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
 
Jan. 18, 2019, 9 a.m. 7.4 ppb (7) 0.0 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 10.0 ppb (8) 0.32 ppb (4) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 18, 2019, 8 a.m. 6.7 ppb (6) 0.0 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 16.0 ppb (12) 0.33 ppb (4) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 18, 2019, 7 a.m. 3.1 ppb (3) -0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 24.0 ppb (18) 0.28 ppb (3) N/A 4.0 μg/m3 (17) 18.0
 
Jan. 18, 2019, 6 a.m. 4.4 ppb (4) -0.1 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 23.0 ppb (18) 0.29 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2019, 5 a.m. 4.0 ppb (4) -0.1 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 27.0 ppb (21) 0.29 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2019, 4 a.m. 2.7 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 31.0 ppb (24) 0.27 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 18, 2019, 3 a.m. 2.7 ppb (3) -0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 32.0 ppb (25) 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 18, 2019, 2 a.m. 2.8 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 33.0 ppb (25) 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2019, 1 a.m. 3.5 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 33.0 ppb (25) 0.32 ppb (4) N/A 4.0 μg/m3 (17) 25.0
 
Jan. 18, 2019, midnight 3.3 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 34.0 ppb (26) 0.3 ppb (3) N/A 6.0 μg/m3 (25) 26.0
 
Jan. 17, 2019, 11 p.m. 3.0 ppb (3) 0.5 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 34.0 ppb (26) 0.31 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 17, 2019, 10 p.m. 1.5 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 36.0 ppb (28) 0.28 ppb (3) N/A 6.0 μg/m3 (25) 28.0
 
Jan. 17, 2019, 9 p.m. 1.8 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 36.0 ppb (28) 0.27 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 17, 2019, 8 p.m. 1.4 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 36.0 ppb (28) 0.26 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 17, 2019, 7 p.m. 3.1 ppb (3) 0.6 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 34.0 ppb (26) 0.27 ppb (3) N/A 6.0 μg/m3 (25) 26.0
 
Jan. 17, 2019, 6 p.m. 4.1 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 34.0 ppb (26) 0.26 ppb (3) N/A 4.0 μg/m3 (17) 26.0
 
Jan. 17, 2019, 5 p.m. 3.6 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 35.0 ppb (27) 0.26 ppb (3) N/A 0.0 μg/m3 (0) 27.0
 
Jan. 17, 2019, 4 p.m. 4.7 ppb (4) 0.9 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 35.0 ppb (27) 0.26 ppb (3) N/A 3.0 μg/m3 (12) 27.0
 
Jan. 17, 2019, 3 p.m. 1.7 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 36.0 ppb (28) 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 17, 2019, 2 p.m. 1.1 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 36.0 ppb (28) 0.23 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 17, 2019, 1 p.m. 0.5 ppb (0) -0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 37.0 ppb (28) 0.23 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 17, 2019, noon 0.3 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 37.0 ppb (28) 0.22 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
Jan. 17, 2019, 11 a.m. 0.5 ppb (0) -0.1 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 36.0 ppb (28) 0.22 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 17, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 17, 2019, 9 a.m. -0.4 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 38.0 ppb (29) 0.22 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 17, 2019, 8 a.m. -0.5 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 37.0 ppb (28) 0.23 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 17, 2019, 7 a.m. -0.1 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 35.0 ppb (27) 0.23 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 17, 2019, 6 a.m. -0.3 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 32.0 ppb (25) 0.23 ppb (3) N/A 0.0 μg/m3 (0) 25.0
 
Jan. 17, 2019, 5 a.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 29.0 ppb (22) 0.24 ppb (3) N/A 2.0 μg/m3 (8) 22.0
 
Jan. 17, 2019, 4 a.m. 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 29.0 ppb (22) 0.24 ppb (3) N/A 2.0 μg/m3 (8) 22.0
 
Jan. 17, 2019, 3 a.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 30.0 ppb (23) 0.24 ppb (3) N/A 0.0 μg/m3 (0) 23.0
 
Jan. 17, 2019, 2 a.m. 0.0 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 30.0 ppb (23) 0.23 ppb (3) N/A 0.0 μg/m3 (0) 23.0
 
Jan. 17, 2019, 1 a.m. 0.4 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 29.0 ppb (22) 0.24 ppb (3) N/A -1.0 μg/m3 (0) 22.0