AQSQID: 060850006

Site Name: San Jose - Knox Ave

Location: San José, CA

Reporting: True, Located: True

Current AQI: 21.0

San José CA, US: 37.338202, -121.849892

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 23, 2019, 8 p.m. 8.0 ppb (7) 1.8 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.36 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 23, 2019, 7 p.m. 8.7 ppb (8) 1.9 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.38 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 23, 2019, 6 p.m. 9.4 ppb (9) 2.3 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.36 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 23, 2019, 5 p.m. 14.2 ppb (13) 3.7 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A 0.42 ppb (5) N/A 3.0 μg/m3 (12) 13.0
 
March 23, 2019, 4 p.m. 21.7 ppb (20) 5.4 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A 0.49 ppb (5) N/A 3.0 μg/m3 (12) 20.0
 
March 23, 2019, 3 p.m. 38.9 ppb (36) 14.5 ppb (13) N/A 24.0 ppb (22) N/A N/A N/A 0.71 ppb (8) N/A 4.0 μg/m3 (17) 36.0
 
March 23, 2019, 2 p.m. 18.8 ppb (17) 2.2 ppb (2) N/A 17.0 ppb (16) N/A N/A N/A 0.51 ppb (6) N/A 7.0 μg/m3 (29) 29.0
 
March 23, 2019, 1 p.m. 26.6 ppb (25) 5.6 ppb (5) N/A 21.0 ppb (19) N/A N/A N/A 0.51 ppb (6) N/A 11.0 μg/m3 (46) 46.0
 
March 23, 2019, noon 21.2 ppb (20) 4.9 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A 0.43 ppb (5) N/A 4.0 μg/m3 (17) 20.0
 
March 23, 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
 
March 23, 2019, 10 a.m. 8.1 ppb (8) 0.9 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.32 ppb (4) N/A 1.0 μg/m3 (4) 8.0
 
March 23, 2019, 9 a.m. 8.3 ppb (8) 1.1 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.38 ppb (4) N/A 3.0 μg/m3 (12) 12.0
 
March 23, 2019, 8 a.m. 3.8 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.31 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
March 23, 2019, 7 a.m. 3.8 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.33 ppb (4) N/A 1.0 μg/m3 (4) 4.0
 
March 23, 2019, 6 a.m. 12.6 ppb (12) 1.7 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.47 ppb (5) N/A 3.0 μg/m3 (12) 12.0
 
March 23, 2019, 5 a.m. 7.2 ppb (7) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.36 ppb (4) N/A 3.0 μg/m3 (12) 12.0
 
March 23, 2019, 4 a.m. 5.6 ppb (5) 0.3 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.35 ppb (4) N/A 1.0 μg/m3 (4) 5.0
 
March 23, 2019, 3 a.m. 8.4 ppb (8) 0.6 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.38 ppb (4) N/A 1.0 μg/m3 (4) 8.0
 
March 23, 2019, 2 a.m. 7.8 ppb (7) 0.9 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.38 ppb (4) N/A 3.0 μg/m3 (12) 12.0
 
March 23, 2019, 1 a.m. 9.5 ppb (9) 1.1 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.4 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 23, 2019, midnight 12.1 ppb (11) 1.9 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.42 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2019, 11 p.m. 11.8 ppb (11) 1.9 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.42 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
March 22, 2019, 10 p.m. 17.9 ppb (17) 4.6 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.46 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
March 22, 2019, 9 p.m. 21.0 ppb (19) 6.5 ppb (6) N/A 15.0 ppb (14) N/A N/A N/A 0.48 ppb (5) N/A 2.0 μg/m3 (8) 19.0
 
March 22, 2019, 8 p.m. 18.6 ppb (17) 5.3 ppb (5) N/A 13.0 ppb (12) N/A N/A N/A 0.44 ppb (5) N/A 3.0 μg/m3 (12) 17.0
 
March 22, 2019, 7 p.m. 17.0 ppb (16) 5.6 ppb (5) N/A 11.0 ppb (10) N/A N/A N/A 0.39 ppb (4) N/A 2.0 μg/m3 (8) 16.0
 
March 22, 2019, 6 p.m. 19.0 ppb (18) 6.6 ppb (6) N/A 12.0 ppb (11) N/A N/A N/A 0.4 ppb (4) N/A 4.0 μg/m3 (17) 18.0
 
March 22, 2019, 5 p.m. 36.6 ppb (34) 15.4 ppb (14) N/A 21.0 ppb (19) N/A N/A N/A 0.5 ppb (6) N/A 6.0 μg/m3 (25) 34.0
 
March 22, 2019, 4 p.m. 37.5 ppb (35) 15.2 ppb (14) N/A 22.0 ppb (20) N/A N/A N/A 0.51 ppb (6) N/A 2.0 μg/m3 (8) 35.0
 
March 22, 2019, 3 p.m. 32.0 ppb (30) 11.7 ppb (11) N/A 20.0 ppb (19) N/A N/A N/A 0.51 ppb (6) N/A 3.0 μg/m3 (12) 30.0
 
March 22, 2019, 2 p.m. 34.6 ppb (32) 13.9 ppb (13) N/A 21.0 ppb (19) N/A N/A N/A 0.52 ppb (6) N/A 4.0 μg/m3 (17) 32.0
 
March 22, 2019, 1 p.m. 32.7 ppb (30) 14.1 ppb (13) N/A 19.0 ppb (18) N/A N/A N/A 0.48 ppb (5) N/A 5.0 μg/m3 (21) 30.0
 
March 22, 2019, noon 16.0 ppb (15) 3.5 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.4 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
March 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
 
March 22, 2019, 10 a.m. 13.9 ppb (13) 3.3 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A 0.32 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2019, 9 a.m. 15.2 ppb (14) 2.3 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A 0.35 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 22, 2019, 8 a.m. 17.1 ppb (16) 1.5 ppb (1) N/A 16.0 ppb (15) N/A N/A N/A 0.43 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
March 22, 2019, 7 a.m. 15.7 ppb (15) 1.4 ppb (1) N/A 14.0 ppb (13) N/A N/A N/A 0.38 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2019, 6 a.m. 12.4 ppb (11) 0.1 ppb (0) N/A 12.0 ppb (11) N/A N/A N/A 0.39 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
March 22, 2019, 5 a.m. 18.5 ppb (17) 0.5 ppb (0) N/A 18.0 ppb (17) N/A N/A N/A 0.5 ppb (6) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2019, 4 a.m. 15.9 ppb (15) 1.0 ppb (1) N/A 15.0 ppb (14) N/A N/A N/A 0.44 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
March 22, 2019, 3 a.m. 11.2 ppb (10) 0.2 ppb (0) N/A 11.0 ppb (10) N/A N/A N/A 0.38 ppb (4) N/A 2.0 μg/m3 (8) 10.0
 
March 22, 2019, 2 a.m. 9.5 ppb (9) 0.6 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.41 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
March 22, 2019, 1 a.m. 10.1 ppb (9) 1.4 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.4 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2019, midnight 14.5 ppb (13) 2.8 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.44 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 11 p.m. 13.8 ppb (13) 2.8 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A 0.42 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
March 21, 2019, 10 p.m. 13.4 ppb (12) 3.1 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.37 ppb (4) N/A 3.0 μg/m3 (12) 12.0
 
March 21, 2019, 9 p.m. 10.2 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.32 ppb (4) N/A 2.0 μg/m3 (8) 9.0
 
March 21, 2019, 8 p.m. 14.5 ppb (13) 3.8 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.35 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
March 21, 2019, 7 p.m. 24.4 ppb (23) 8.0 ppb (7) N/A 16.0 ppb (15) N/A N/A N/A 0.42 ppb (5) N/A 3.0 μg/m3 (12) 23.0
 
March 21, 2019, 6 p.m. 22.1 ppb (20) 6.7 ppb (6) N/A 16.0 ppb (15) N/A N/A N/A 0.44 ppb (5) N/A 4.0 μg/m3 (17) 20.0
 
March 21, 2019, 5 p.m. 23.4 ppb (22) 7.4 ppb (7) N/A 16.0 ppb (15) N/A N/A N/A 0.49 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 4 p.m. 48.0 ppb (44) 24.3 ppb (23) N/A 24.0 ppb (22) N/A N/A N/A 0.69 ppb (8) N/A 8.0 μg/m3 (33) 44.0
 
March 21, 2019, 3 p.m. 57.4 ppb (54) 33.3 ppb (31) N/A 24.0 ppb (22) N/A N/A N/A 0.94 ppb (10) N/A 7.0 μg/m3 (29) 54.0
 
March 21, 2019, 2 p.m. 72.7 ppb (70) 49.1 ppb (45) N/A 24.0 ppb (22) N/A N/A N/A 1.06 ppb (12) N/A 8.0 μg/m3 (33) 70.0
 
March 21, 2019, 1 p.m. 43.1 ppb (40) 22.3 ppb (21) N/A 21.0 ppb (19) N/A N/A N/A 0.82 ppb (9) N/A 7.0 μg/m3 (29) 40.0
 
March 21, 2019, noon 36.3 ppb (34) 14.9 ppb (14) N/A 21.0 ppb (19) N/A N/A N/A 0.57 ppb (6) N/A 5.0 μg/m3 (21) 34.0
 
March 21, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 21, 2019, 10 a.m. 12.5 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A 0.37 ppb (4) N/A 2.0 μg/m3 (8) 12.0
 
March 21, 2019, 9 a.m. 13.2 ppb (12) 1.3 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A 0.33 ppb (4) N/A 0.0 μg/m3 (0) 12.0
 
March 21, 2019, 8 a.m. 9.7 ppb (9) 0.4 ppb (0) N/A 9.0 ppb (8) N/A N/A N/A 0.33 ppb (4) N/A -1.0 μg/m3 (0) 9.0
 
March 21, 2019, 7 a.m. 17.9 ppb (17) 2.9 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.41 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
March 21, 2019, 6 a.m. 15.2 ppb (14) 1.0 ppb (1) N/A 14.0 ppb (13) N/A N/A N/A 0.44 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
March 21, 2019, 5 a.m. 13.4 ppb (12) 0.2 ppb (0) N/A 13.0 ppb (12) N/A N/A N/A 0.43 ppb (5) N/A 3.0 μg/m3 (12) 12.0
 
March 21, 2019, 4 a.m. 13.9 ppb (13) 0.3 ppb (0) N/A 14.0 ppb (13) N/A N/A N/A 0.45 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
March 21, 2019, 3 a.m. 17.9 ppb (17) 2.2 ppb (2) N/A 16.0 ppb (15) N/A N/A N/A 0.43 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 2 a.m. 16.6 ppb (15) 2.5 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A 0.42 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
March 21, 2019, 1 a.m. 10.1 ppb (9) 1.3 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.38 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
March 21, 2019, midnight 12.1 ppb (11) 2.4 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.37 ppb (4) N/A 3.0 μg/m3 (12) 12.0
 
March 20, 2019, 11 p.m. 18.6 ppb (17) 4.9 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A 0.48 ppb (5) N/A 1.0 μg/m3 (4) 17.0
 
March 20, 2019, 10 p.m. 19.1 ppb (18) 5.9 ppb (5) N/A 13.0 ppb (12) N/A N/A N/A 0.46 ppb (5) N/A 0.0 μg/m3 (0) 18.0
 
March 20, 2019, 9 p.m. 18.2 ppb (17) 4.9 ppb (5) N/A 13.0 ppb (12) N/A N/A N/A 0.41 ppb (5) N/A 1.0 μg/m3 (4) 17.0
 
March 20, 2019, 8 p.m. 19.7 ppb (18) 5.4 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A 0.44 ppb (5) N/A 3.0 μg/m3 (12) 18.0
 
March 20, 2019, 7 p.m. 21.9 ppb (20) 6.2 ppb (6) N/A 16.0 ppb (15) N/A N/A N/A 0.46 ppb (5) N/A N/A 20.0
 
March 20, 2019, 6 p.m. 14.8 ppb (14) 4.0 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.42 ppb (5) N/A 2.0 μg/m3 (8) 14.0
 
March 20, 2019, 5 p.m. 11.6 ppb (11) 3.9 ppb (4) N/A 8.0 ppb (7) N/A N/A N/A 0.34 ppb (4) N/A 0.0 μg/m3 (0) 11.0
 
March 20, 2019, 4 p.m. 13.3 ppb (12) 2.9 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.36 ppb (4) N/A 1.0 μg/m3 (4) 12.0
 
March 20, 2019, 3 p.m. 6.4 ppb (6) 0.5 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.31 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 20, 2019, 2 p.m. 16.3 ppb (15) 2.7 ppb (3) N/A 14.0 ppb (13) N/A N/A N/A 0.37 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 20, 2019, 1 p.m. 13.3 ppb (12) 2.0 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.36 ppb (4) N/A 2.0 μg/m3 (8) 12.0
 
March 20, 2019, noon 8.8 ppb (8) 0.7 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.3 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
March 20, 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
 
March 20, 2019, 10 a.m. 6.1 ppb (6) 0.5 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
March 20, 2019, 9 a.m. 1.6 ppb (1) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.24 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 20, 2019, 8 a.m. 3.0 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 20, 2019, 7 a.m. 9.9 ppb (9) 0.8 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.33 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 20, 2019, 6 a.m. 13.7 ppb (13) 1.9 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.35 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
March 20, 2019, 5 a.m. 5.5 ppb (5) 0.5 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.29 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 20, 2019, 4 a.m. 8.5 ppb (8) 0.6 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.31 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 20, 2019, 3 a.m. 18.2 ppb (17) 3.3 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.37 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 20, 2019, 2 a.m. 21.0 ppb (19) 3.1 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A 0.44 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
March 20, 2019, 1 a.m. 16.1 ppb (15) 3.1 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.4 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 20, 2019, midnight 18.0 ppb (17) 3.7 ppb (3) N/A 14.0 ppb (13) N/A N/A N/A 0.42 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
March 19, 2019, 11 p.m. 9.9 ppb (9) 1.6 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.3 ppb (3) N/A 1.0 μg/m3 (4) 9.0
 
March 19, 2019, 10 p.m. 18.6 ppb (17) 3.2 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.38 ppb (4) N/A 2.0 μg/m3 (8) 17.0
 
March 19, 2019, 9 p.m. 13.4 ppb (12) 2.4 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.32 ppb (4) N/A 3.0 μg/m3 (12) 12.0
 
March 19, 2019, 8 p.m. 20.5 ppb (19) 4.6 ppb (4) N/A 16.0 ppb (15) N/A N/A N/A 0.34 ppb (4) N/A 3.0 μg/m3 (12) 19.0
 
March 19, 2019, 7 p.m. 21.6 ppb (20) 5.2 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A 0.36 ppb (4) N/A 4.0 μg/m3 (17) 20.0
 
March 19, 2019, 6 p.m. 31.5 ppb (29) 11.7 ppb (11) N/A 20.0 ppb (19) N/A N/A N/A 0.46 ppb (5) N/A 5.0 μg/m3 (21) 29.0
 
March 19, 2019, 5 p.m. 34.0 ppb (31) 12.9 ppb (12) N/A 21.0 ppb (19) N/A N/A N/A 0.47 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 4 p.m. 42.0 ppb (39) 18.7 ppb (17) N/A 23.0 ppb (21) N/A N/A N/A 0.59 ppb (7) N/A 14.0 μg/m3 (54) 54.0
 
March 19, 2019, 3 p.m. 41.2 ppb (38) 17.4 ppb (16) N/A 24.0 ppb (22) N/A N/A N/A 0.74 ppb (8) N/A 15.0 μg/m3 (56) 56.0
 
March 19, 2019, 2 p.m. 50.2 ppb (46) 24.0 ppb (22) N/A 26.0 ppb (24) N/A N/A N/A 0.77 ppb (9) N/A 11.0 μg/m3 (46) 46.0
 
March 19, 2019, 1 p.m. 30.3 ppb (28) 6.2 ppb (6) N/A 24.0 ppb (22) N/A N/A N/A 0.53 ppb (6) N/A 11.0 μg/m3 (46) 46.0
 
March 19, 2019, noon 31.5 ppb (29) 10.4 ppb (10) N/A 21.0 ppb (19) N/A N/A N/A 0.49 ppb (5) N/A 17.0 μg/m3 (61) 61.0
 
March 19, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 17.0 μg/m3 (61) 61.0
 
March 19, 2019, 10 a.m. 12.4 ppb (11) 2.4 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.3 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 9 a.m. 10.6 ppb (10) 1.9 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.34 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 8 a.m. 14.1 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.38 ppb (4) N/A 18.0 μg/m3 (63) 63.0
 
March 19, 2019, 7 a.m. 16.4 ppb (15) 2.3 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A 0.47 ppb (5) N/A 20.0 μg/m3 (67) 67.0
 
March 19, 2019, 6 a.m. 19.9 ppb (18) 2.2 ppb (2) N/A 18.0 ppb (17) N/A N/A N/A 0.49 ppb (5) N/A 15.0 μg/m3 (56) 56.0
 
March 19, 2019, 5 a.m. 25.5 ppb (24) 3.3 ppb (3) N/A 22.0 ppb (20) N/A N/A N/A 0.64 ppb (7) N/A 16.0 μg/m3 (59) 59.0
 
March 19, 2019, 4 a.m. 15.1 ppb (14) 0.3 ppb (0) N/A 15.0 ppb (14) N/A N/A N/A 0.46 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 3 a.m. 17.3 ppb (16) 0.3 ppb (0) N/A 17.0 ppb (16) N/A N/A N/A 0.5 ppb (6) N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 2 a.m. 35.7 ppb (33) 4.6 ppb (4) N/A 31.0 ppb (29) N/A N/A N/A 0.71 ppb (8) N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 1 a.m. 18.7 ppb (17) 3.5 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.42 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, midnight 22.0 ppb (20) 5.2 ppb (5) N/A 17.0 ppb (16) N/A N/A N/A 0.44 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
March 18, 2019, 11 p.m. 22.0 ppb (20) 5.5 ppb (5) N/A 17.0 ppb (16) N/A N/A N/A 0.45 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 10 p.m. 20.2 ppb (19) 4.9 ppb (5) N/A 15.0 ppb (14) N/A N/A N/A 0.41 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
March 18, 2019, 9 p.m. 20.1 ppb (19) 3.9 ppb (4) N/A 16.0 ppb (15) N/A N/A N/A 0.44 ppb (5) N/A 3.0 μg/m3 (12) 19.0
 
March 18, 2019, 8 p.m. 29.1 ppb (27) 5.7 ppb (5) N/A 23.0 ppb (21) N/A N/A N/A 0.62 ppb (7) N/A 6.0 μg/m3 (25) 27.0
 
March 18, 2019, 7 p.m. 27.7 ppb (26) 6.1 ppb (6) N/A 22.0 ppb (20) N/A N/A N/A 0.56 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
March 18, 2019, 6 p.m. 32.6 ppb (30) 8.9 ppb (8) N/A 24.0 ppb (22) N/A N/A N/A 0.61 ppb (7) N/A N/A 30.0
 
March 18, 2019, 5 p.m. 50.3 ppb (47) 20.5 ppb (19) N/A 30.0 ppb (28) N/A N/A N/A 0.72 ppb (8) N/A 13.0 μg/m3 (52) 52.0
 
March 18, 2019, 4 p.m. 59.6 ppb (56) 28.1 ppb (26) N/A 32.0 ppb (30) N/A N/A N/A 0.85 ppb (9) N/A 19.0 μg/m3 (65) 65.0
 
March 18, 2019, 3 p.m. 83.9 ppb (82) 55.2 ppb (51) N/A 29.0 ppb (27) N/A N/A N/A 1.32 ppb (15) N/A 18.0 μg/m3 (63) 82.0
 
March 18, 2019, 2 p.m. 110.3 ppb (102) 82.1 ppb (80) N/A 28.0 ppb (26) N/A N/A N/A 1.52 ppb (17) N/A 24.0 μg/m3 (76) 102.0
 
March 18, 2019, 1 p.m. 68.5 ppb (65) 41.9 ppb (39) N/A 27.0 ppb (25) N/A N/A N/A 1.07 ppb (12) N/A 14.0 μg/m3 (54) 65.0
 
March 18, 2019, noon 50.3 ppb (47) 23.0 ppb (21) N/A 27.0 ppb (25) N/A N/A N/A 0.81 ppb (9) N/A 14.0 μg/m3 (54) 54.0
 
March 18, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 17.0 μg/m3 (61) 61.0
 
March 18, 2019, 10 a.m. 31.6 ppb (29) 5.6 ppb (5) N/A 26.0 ppb (24) N/A N/A N/A 0.75 ppb (8) N/A 15.0 μg/m3 (56) 56.0
 
March 18, 2019, 9 a.m. 24.3 ppb (23) 1.3 ppb (1) N/A 23.0 ppb (21) N/A N/A N/A 0.64 ppb (7) N/A 13.0 μg/m3 (52) 52.0
 
March 18, 2019, 8 a.m. 39.6 ppb (37) 11.4 ppb (11) N/A 28.0 ppb (26) N/A N/A N/A 0.78 ppb (9) N/A 17.0 μg/m3 (61) 61.0
 
March 18, 2019, 7 a.m. 31.9 ppb (30) 2.9 ppb (3) N/A 29.0 ppb (27) N/A N/A N/A 0.84 ppb (9) N/A 18.0 μg/m3 (63) 63.0
 
March 18, 2019, 6 a.m. 20.0 ppb (19) 1.6 ppb (1) N/A 18.0 ppb (17) N/A N/A N/A 0.56 ppb (6) N/A 16.0 μg/m3 (59) 59.0
 
March 18, 2019, 5 a.m. 20.8 ppb (19) 0.3 ppb (0) N/A 21.0 ppb (19) N/A N/A N/A 0.68 ppb (8) N/A 18.0 μg/m3 (63) 63.0
 
March 18, 2019, 4 a.m. 36.6 ppb (34) 2.2 ppb (2) N/A 34.0 ppb (31) N/A N/A N/A 0.83 ppb (9) N/A 20.0 μg/m3 (67) 67.0
 
March 18, 2019, 3 a.m. 38.1 ppb (35) 4.2 ppb (4) N/A 34.0 ppb (31) N/A N/A N/A 0.82 ppb (9) N/A 21.0 μg/m3 (69) 69.0
 
March 18, 2019, 2 a.m. 28.8 ppb (27) 3.1 ppb (3) N/A 26.0 ppb (24) N/A N/A N/A 0.79 ppb (9) N/A 11.0 μg/m3 (46) 46.0
 
March 18, 2019, 1 a.m. 21.1 ppb (20) 2.8 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A 0.66 ppb (7) N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, midnight 14.3 ppb (13) 1.7 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A 0.53 ppb (6) N/A 7.0 μg/m3 (29) 29.0
 
March 17, 2019, 11 p.m. 16.4 ppb (15) 2.6 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A 0.58 ppb (6) N/A 12.0 μg/m3 (50) 50.0
 
March 17, 2019, 10 p.m. 15.3 ppb (14) 1.9 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A 0.52 ppb (6) N/A 7.0 μg/m3 (29) 29.0
 
March 17, 2019, 9 p.m. 14.0 ppb (13) 2.2 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.48 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
March 17, 2019, 8 p.m. 14.3 ppb (13) 2.4 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.48 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 7 p.m. 14.9 ppb (14) 2.9 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.51 ppb (6) N/A 5.0 μg/m3 (21) 21.0
 
March 17, 2019, 6 p.m. 19.1 ppb (18) 5.0 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A 0.53 ppb (6) N/A 5.0 μg/m3 (21) 21.0
 
March 17, 2019, 5 p.m. 20.2 ppb (19) 6.1 ppb (6) N/A 14.0 ppb (13) N/A N/A N/A 0.51 ppb (6) N/A 8.0 μg/m3 (33) 33.0
 
March 17, 2019, 4 p.m. 24.7 ppb (23) 8.0 ppb (7) N/A 17.0 ppb (16) N/A N/A N/A 0.55 ppb (6) N/A 7.0 μg/m3 (29) 29.0
 
March 17, 2019, 3 p.m. 33.6 ppb (31) 12.1 ppb (11) N/A 22.0 ppb (20) N/A N/A N/A 0.63 ppb (7) N/A 10.0 μg/m3 (42) 42.0
 
March 17, 2019, 2 p.m. 33.6 ppb (31) 10.1 ppb (9) N/A 23.0 ppb (21) N/A N/A N/A 0.6 ppb (7) N/A 15.0 μg/m3 (56) 56.0
 
March 17, 2019, 1 p.m. 34.0 ppb (31) 11.0 ppb (10) N/A 23.0 ppb (21) N/A N/A N/A 0.68 ppb (8) N/A 15.0 μg/m3 (56) 56.0
 
March 17, 2019, noon 35.7 ppb (33) 11.4 ppb (11) N/A 24.0 ppb (22) N/A N/A N/A 0.77 ppb (9) N/A 21.0 μg/m3 (69) 69.0
 
March 17, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 52.0
 
March 17, 2019, 10 a.m. 31.4 ppb (29) 7.0 ppb (6) N/A 24.0 ppb (22) N/A N/A N/A 0.76 ppb (8) N/A 15.0 μg/m3 (56) 56.0
 
March 17, 2019, 9 a.m. 20.5 ppb (19) 0.9 ppb (1) N/A 20.0 ppb (19) N/A N/A N/A 0.57 ppb (6) N/A 14.0 μg/m3 (54) 54.0
 
March 17, 2019, 8 a.m. 21.0 ppb (19) 0.7 ppb (1) N/A 20.0 ppb (19) N/A N/A N/A 0.57 ppb (6) N/A 15.0 μg/m3 (56) 56.0
 
March 17, 2019, 7 a.m. 23.1 ppb (21) 1.7 ppb (2) N/A 21.0 ppb (19) N/A N/A N/A 0.6 ppb (7) N/A 12.0 μg/m3 (50) 50.0
 
March 17, 2019, 6 a.m. 24.4 ppb (23) 0.5 ppb (0) N/A 24.0 ppb (22) N/A N/A N/A 0.65 ppb (7) N/A 10.0 μg/m3 (42) 42.0
 
March 17, 2019, 5 a.m. 33.2 ppb (31) 4.8 ppb (4) N/A 28.0 ppb (26) N/A N/A N/A 0.77 ppb (9) N/A 9.0 μg/m3 (38) 38.0
 
March 17, 2019, 4 a.m. 22.8 ppb (21) 3.3 ppb (3) N/A 20.0 ppb (19) N/A N/A N/A 0.64 ppb (7) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 3 a.m. 20.7 ppb (19) 2.9 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A 0.58 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
March 17, 2019, 2 a.m. 21.3 ppb (20) 1.8 ppb (2) N/A 20.0 ppb (19) N/A N/A N/A 0.59 ppb (7) N/A 7.0 μg/m3 (29) 29.0
 
March 17, 2019, 1 a.m. 19.3 ppb (18) 1.9 ppb (2) N/A 18.0 ppb (17) N/A N/A N/A 0.58 ppb (6) N/A 8.0 μg/m3 (33) 33.0
 
March 17, 2019, midnight 16.9 ppb (16) 2.1 ppb (2) N/A 15.0 ppb (14) N/A N/A N/A 0.51 ppb (6) N/A 6.0 μg/m3 (25) 25.0
 
March 16, 2019, 11 p.m. 15.5 ppb (14) 2.4 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A 0.49 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
March 16, 2019, 10 p.m. 14.3 ppb (13) 2.4 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.45 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
March 16, 2019, 9 p.m. 15.9 ppb (15) 3.1 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.39 ppb (4) N/A 5.0 μg/m3 (21) 21.0