AQSQID: 060719004

Site Name: San Bernadino - 4th Street

Location: San Bernardino Co, CA

Reporting: True, Located: True

Current AQI: 17.0

San Bernardino Co CA, US: 34.1072, -117.2731

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 24, 2019, 1 p.m. 18.8 ppb (17) 2.1 ppb (2) N/A 17.0 ppb (16) N/A N/A 8.0 ppb (6) 0.3 ppb (3) 19.0 μg/m3 (17) N/A 17.0
 
March 24, 2019, noon 13.8 ppb (13) 1.8 ppb (2) N/A 12.0 ppb (11) N/A N/A 14.0 ppb (11) 0.25 ppb (3) 12.0 μg/m3 (11) N/A 13.0
 
March 24, 2019, 11 a.m. 8.3 ppb (8) 1.0 ppb (1) N/A 7.0 ppb (6) N/A N/A 24.0 ppb (18) 0.19 ppb (2) 11.0 μg/m3 (10) N/A 18.0
 
March 24, 2019, 10 a.m. 7.8 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A N/A 27.0 ppb (21) 0.17 ppb (2) 9.0 μg/m3 (8) N/A 21.0
 
March 24, 2019, 9 a.m. 7.6 ppb (7) 0.9 ppb (1) N/A 7.0 ppb (6) N/A N/A 26.0 ppb (20) 0.17 ppb (2) 8.0 μg/m3 (7) N/A 20.0
 
March 24, 2019, 8 a.m. 7.9 ppb (7) 0.9 ppb (1) N/A 7.0 ppb (6) N/A N/A 27.0 ppb (21) 0.17 ppb (2) 13.0 μg/m3 (12) N/A 21.0
 
March 24, 2019, 7 a.m. 8.7 ppb (8) 0.9 ppb (1) N/A 8.0 ppb (7) N/A N/A 26.0 ppb (20) 0.17 ppb (2) 8.0 μg/m3 (7) N/A 20.0
 
March 24, 2019, 6 a.m. 8.1 ppb (8) 0.9 ppb (1) N/A 7.0 ppb (6) N/A N/A 28.0 ppb (22) 0.17 ppb (2) 8.0 μg/m3 (7) N/A 22.0
 
March 24, 2019, 5 a.m. 6.4 ppb (6) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A 31.0 ppb (24) 0.17 ppb (2) 6.0 μg/m3 (5) N/A 24.0
 
March 24, 2019, 4 a.m. 7.7 ppb (7) 0.9 ppb (1) N/A 7.0 ppb (6) N/A N/A 33.0 ppb (25) 0.19 ppb (2) 9.0 μg/m3 (8) N/A 25.0
 
March 24, 2019, 3 a.m. 8.6 ppb (8) 1.1 ppb (1) N/A 8.0 ppb (7) N/A N/A 40.0 ppb (31) 0.2 ppb (2) 18.0 μg/m3 (16) N/A 31.0
 
March 24, 2019, 2 a.m. 8.4 ppb (8) 0.8 ppb (1) N/A 8.0 ppb (7) N/A N/A 46.0 ppb (35) 0.2 ppb (2) 17.0 μg/m3 (15) N/A 35.0
 
March 24, 2019, 1 a.m. 6.5 ppb (6) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A 52.0 ppb (40) 0.19 ppb (2) 19.0 μg/m3 (17) N/A 40.0
 
March 24, 2019, midnight 6.5 ppb (6) 1.1 ppb (1) N/A 5.0 ppb (5) N/A N/A 58.0 ppb (45) 0.19 ppb (2) 20.0 μg/m3 (18) N/A 45.0
 
March 23, 2019, 11 p.m. 3.6 ppb (3) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 61.0 ppb (47) 0.14 ppb (2) 11.0 μg/m3 (10) N/A 47.0
 
March 23, 2019, 10 p.m. 3.6 ppb (3) 1.1 ppb (1) N/A 3.0 ppb (3) N/A N/A 57.0 ppb (44) 0.15 ppb (2) 8.0 μg/m3 (7) N/A 44.0
 
March 23, 2019, 9 p.m. 4.5 ppb (4) 1.4 ppb (1) N/A 3.0 ppb (3) N/A N/A 56.0 ppb (43) 0.16 ppb (2) 9.0 μg/m3 (8) N/A 43.0
 
March 23, 2019, 8 p.m. 5.1 ppb (5) 1.6 ppb (1) N/A 4.0 ppb (4) N/A N/A 53.0 ppb (41) 0.19 ppb (2) 13.0 μg/m3 (12) N/A 41.0
 
March 23, 2019, 7 p.m. 13.3 ppb (12) 4.5 ppb (4) N/A 9.0 ppb (8) N/A N/A 42.0 ppb (32) 0.24 ppb (3) 24.0 μg/m3 (22) N/A 32.0
 
March 23, 2019, 6 p.m. 31.4 ppb (29) 13.3 ppb (12) N/A 18.0 ppb (17) N/A N/A 26.0 ppb (20) 0.31 ppb (3) 17.0 μg/m3 (15) N/A 29.0
 
March 23, 2019, 5 p.m. 31.7 ppb (29) 13.8 ppb (13) N/A 18.0 ppb (17) N/A N/A 21.0 ppb (16) 0.32 ppb (4) 20.0 μg/m3 (18) N/A 29.0
 
March 23, 2019, 4 p.m. 29.3 ppb (27) 11.8 ppb (11) N/A 17.0 ppb (16) N/A N/A 14.0 ppb (11) 0.33 ppb (4) 19.0 μg/m3 (17) N/A 27.0
 
March 23, 2019, 3 p.m. 27.4 ppb (25) 14.0 ppb (13) N/A 13.0 ppb (12) N/A N/A 8.0 ppb (6) 0.37 ppb (4) 22.0 μg/m3 (20) N/A 25.0
 
March 23, 2019, 2 p.m. 30.9 ppb (29) 17.4 ppb (16) N/A 14.0 ppb (13) N/A N/A 4.0 ppb (3) 0.44 ppb (5) 23.0 μg/m3 (21) N/A 29.0
 
March 23, 2019, 1 p.m. 19.9 ppb (18) 4.9 ppb (5) N/A 15.0 ppb (14) N/A N/A 4.0 ppb (3) 0.36 ppb (4) 22.0 μg/m3 (20) N/A 20.0
 
March 23, 2019, noon 19.2 ppb (18) 3.9 ppb (4) N/A 15.0 ppb (14) N/A N/A 4.0 ppb (3) 0.35 ppb (4) 21.0 μg/m3 (19) N/A 19.0
 
March 23, 2019, 11 a.m. 20.0 ppb (19) 3.0 ppb (3) N/A 17.0 ppb (16) N/A N/A 5.0 ppb (4) 0.3 ppb (3) 22.0 μg/m3 (20) N/A 20.0
 
March 23, 2019, 10 a.m. 25.8 ppb (24) 3.7 ppb (3) N/A 22.0 ppb (20) N/A N/A 4.0 ppb (3) 0.29 ppb (3) 19.0 μg/m3 (17) N/A 24.0
 
March 23, 2019, 9 a.m. 31.3 ppb (29) 4.8 ppb (4) N/A 26.0 ppb (24) N/A N/A 5.0 ppb (4) 0.39 ppb (4) 22.0 μg/m3 (20) N/A 29.0
 
March 23, 2019, 8 a.m. 26.2 ppb (24) 2.5 ppb (2) N/A 24.0 ppb (22) N/A N/A 11.0 ppb (8) 0.33 ppb (4) 22.0 μg/m3 (20) N/A 24.0
 
March 23, 2019, 7 a.m. 21.9 ppb (20) 1.6 ppb (1) N/A 20.0 ppb (19) N/A N/A 18.0 ppb (14) 0.32 ppb (4) 21.0 μg/m3 (19) N/A 20.0
 
March 23, 2019, 6 a.m. 21.4 ppb (20) 1.6 ppb (1) N/A 20.0 ppb (19) N/A N/A 22.0 ppb (17) 0.28 ppb (3) 21.0 μg/m3 (19) N/A 20.0
 
March 23, 2019, 5 a.m. 16.3 ppb (15) 1.3 ppb (1) N/A 15.0 ppb (14) N/A N/A 31.0 ppb (24) 0.24 ppb (3) 25.0 μg/m3 (23) N/A 24.0
 
March 23, 2019, 4 a.m. 17.2 ppb (16) 1.2 ppb (1) N/A 16.0 ppb (15) N/A N/A 32.0 ppb (25) 0.26 ppb (3) 27.0 μg/m3 (25) N/A 25.0
 
March 23, 2019, 3 a.m. 16.3 ppb (15) 1.1 ppb (1) N/A 15.0 ppb (14) N/A N/A 36.0 ppb (28) 0.24 ppb (3) 27.0 μg/m3 (25) N/A 28.0
 
March 23, 2019, 2 a.m. 15.7 ppb (15) 1.2 ppb (1) N/A 15.0 ppb (14) N/A N/A 43.0 ppb (33) 0.26 ppb (3) 28.0 μg/m3 (25) N/A 33.0
 
March 23, 2019, 1 a.m. 11.0 ppb (10) 1.4 ppb (1) N/A 10.0 ppb (9) N/A N/A 53.0 ppb (41) 0.22 ppb (2) 35.0 μg/m3 (32) N/A 41.0
 
March 23, 2019, midnight 7.7 ppb (7) 1.5 ppb (1) N/A 6.0 ppb (6) N/A N/A 57.0 ppb (44) 0.18 ppb (2) 27.0 μg/m3 (25) N/A 44.0
 
March 22, 2019, 11 p.m. 7.4 ppb (7) 1.7 ppb (2) N/A 6.0 ppb (6) N/A N/A 58.0 ppb (45) 0.17 ppb (2) 31.0 μg/m3 (28) N/A 45.0
 
March 22, 2019, 10 p.m. 8.6 ppb (8) 2.2 ppb (2) N/A 6.0 ppb (6) N/A N/A 56.0 ppb (43) 0.19 ppb (2) 30.0 μg/m3 (27) N/A 43.0
 
March 22, 2019, 9 p.m. 9.9 ppb (9) 3.0 ppb (3) N/A 7.0 ppb (6) N/A N/A 52.0 ppb (40) 0.18 ppb (2) 36.0 μg/m3 (33) N/A 40.0
 
March 22, 2019, 8 p.m. 11.2 ppb (10) 3.4 ppb (3) N/A 8.0 ppb (7) N/A N/A 47.0 ppb (36) 0.19 ppb (2) 44.0 μg/m3 (40) N/A 40.0
 
March 22, 2019, 7 p.m. 12.1 ppb (11) 3.9 ppb (4) N/A 8.0 ppb (7) N/A N/A 43.0 ppb (33) 0.2 ppb (2) N/A N/A 33.0
 
March 22, 2019, 6 p.m. 13.5 ppb (12) 4.3 ppb (4) N/A 9.0 ppb (8) N/A N/A 39.0 ppb (30) 0.2 ppb (2) N/A N/A 30.0
 
March 22, 2019, 5 p.m. 15.4 ppb (14) 3.8 ppb (4) N/A 12.0 ppb (11) N/A N/A 33.0 ppb (25) 0.2 ppb (2) N/A N/A 25.0
 
March 22, 2019, 4 p.m. 21.7 ppb (20) 6.7 ppb (6) N/A 15.0 ppb (14) N/A N/A 30.0 ppb (23) 0.25 ppb (3) 12.0 μg/m3 (11) N/A 23.0
 
March 22, 2019, 3 p.m. 23.9 ppb (22) 6.9 ppb (6) N/A 17.0 ppb (16) N/A N/A 26.0 ppb (20) 0.25 ppb (3) 17.0 μg/m3 (15) N/A 22.0
 
March 22, 2019, 2 p.m. 23.1 ppb (21) 3.7 ppb (3) N/A 19.0 ppb (18) N/A N/A 22.0 ppb (17) 0.29 ppb (3) 15.0 μg/m3 (14) N/A 21.0
 
March 22, 2019, 1 p.m. 11.7 ppb (11) 1.1 ppb (1) N/A 11.0 ppb (10) N/A N/A 31.0 ppb (24) 0.21 ppb (2) 12.0 μg/m3 (11) N/A 24.0
 
March 22, 2019, noon 11.0 ppb (10) 1.1 ppb (1) N/A 10.0 ppb (9) N/A N/A 31.0 ppb (24) 0.19 ppb (2) 9.0 μg/m3 (8) N/A 24.0
 
March 22, 2019, 11 a.m. 10.6 ppb (10) 1.3 ppb (1) N/A 9.0 ppb (8) N/A N/A 31.0 ppb (24) 0.18 ppb (2) 6.0 μg/m3 (5) N/A 24.0
 
March 22, 2019, 10 a.m. 11.6 ppb (11) 1.1 ppb (1) N/A 10.0 ppb (9) N/A N/A 29.0 ppb (22) 0.18 ppb (2) 8.0 μg/m3 (7) N/A 22.0
 
March 22, 2019, 9 a.m. 16.8 ppb (16) 1.1 ppb (1) N/A 16.0 ppb (15) N/A N/A 25.0 ppb (19) 0.18 ppb (2) 9.0 μg/m3 (8) N/A 19.0
 
March 22, 2019, 8 a.m. 20.7 ppb (19) 1.2 ppb (1) N/A 20.0 ppb (19) N/A N/A 23.0 ppb (18) 0.19 ppb (2) 9.0 μg/m3 (8) N/A 19.0
 
March 22, 2019, 7 a.m. 13.7 ppb (13) 1.0 ppb (1) N/A 13.0 ppb (12) N/A N/A 29.0 ppb (22) 0.18 ppb (2) 8.0 μg/m3 (7) N/A 22.0
 
March 22, 2019, 6 a.m. 9.9 ppb (9) 0.8 ppb (1) N/A 9.0 ppb (8) N/A N/A 33.0 ppb (25) 0.18 ppb (2) 9.0 μg/m3 (8) N/A 25.0
 
March 22, 2019, 5 a.m. 9.6 ppb (9) 0.9 ppb (1) N/A 9.0 ppb (8) N/A N/A 34.0 ppb (26) 0.19 ppb (2) 8.0 μg/m3 (7) N/A 26.0
 
March 22, 2019, 4 a.m. 10.6 ppb (10) 0.8 ppb (1) N/A 10.0 ppb (9) N/A N/A 35.0 ppb (27) 0.19 ppb (2) 4.0 μg/m3 (4) N/A 27.0
 
March 22, 2019, 3 a.m. 12.1 ppb (11) 0.8 ppb (1) N/A 11.0 ppb (10) N/A N/A 37.0 ppb (28) 0.2 ppb (2) 9.0 μg/m3 (8) N/A 28.0
 
March 22, 2019, 2 a.m. 9.5 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A N/A 43.0 ppb (33) 0.19 ppb (2) 4.0 μg/m3 (4) N/A 33.0
 
March 22, 2019, 1 a.m. 6.2 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A 50.0 ppb (38) 0.16 ppb (2) 4.0 μg/m3 (4) N/A 38.0
 
March 22, 2019, midnight 5.9 ppb (5) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A 51.0 ppb (39) 0.17 ppb (2) 5.0 μg/m3 (5) N/A 39.0
 
March 21, 2019, 11 p.m. 5.4 ppb (5) 1.7 ppb (2) N/A 4.0 ppb (4) N/A N/A 51.0 ppb (39) 0.16 ppb (2) 5.0 μg/m3 (5) N/A 39.0
 
March 21, 2019, 10 p.m. 4.9 ppb (5) 1.7 ppb (2) N/A 3.0 ppb (3) N/A N/A 51.0 ppb (39) 0.16 ppb (2) 4.0 μg/m3 (4) N/A 39.0
 
March 21, 2019, 9 p.m. 5.0 ppb (5) 1.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 50.0 ppb (38) 0.15 ppb (2) 4.0 μg/m3 (4) N/A 38.0
 
March 21, 2019, 8 p.m. 6.8 ppb (6) 1.8 ppb (2) N/A 5.0 ppb (5) N/A N/A 47.0 ppb (36) 0.17 ppb (2) 8.0 μg/m3 (7) N/A 36.0
 
March 21, 2019, 7 p.m. 7.7 ppb (7) 2.6 ppb (2) N/A 5.0 ppb (5) N/A N/A 47.0 ppb (36) 0.16 ppb (2) 5.0 μg/m3 (5) N/A 36.0
 
March 21, 2019, 6 p.m. 5.8 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A N/A 47.0 ppb (36) 0.15 ppb (2) 4.0 μg/m3 (4) N/A 36.0
 
March 21, 2019, 5 p.m. 4.5 ppb (4) 1.8 ppb (2) N/A 3.0 ppb (3) N/A N/A 47.0 ppb (36) 0.14 ppb (2) 5.0 μg/m3 (5) N/A 36.0
 
March 21, 2019, 4 p.m. 6.5 ppb (6) 1.9 ppb (2) N/A 5.0 ppb (5) N/A N/A 41.0 ppb (32) 0.17 ppb (2) 6.0 μg/m3 (5) N/A 32.0
 
March 21, 2019, 3 p.m. 15.9 ppb (15) 4.8 ppb (4) N/A 11.0 ppb (10) N/A N/A 28.0 ppb (22) 0.25 ppb (3) 8.0 μg/m3 (7) N/A 22.0
 
March 21, 2019, 2 p.m. 22.7 ppb (21) 3.8 ppb (4) N/A 19.0 ppb (18) N/A N/A 18.0 ppb (14) 0.27 ppb (3) 8.0 μg/m3 (7) N/A 21.0
 
March 21, 2019, 1 p.m. 13.1 ppb (12) 1.3 ppb (1) N/A 12.0 ppb (11) N/A N/A 25.0 ppb (19) 0.24 ppb (3) 3.0 μg/m3 (3) N/A 19.0
 
March 21, 2019, noon 13.2 ppb (12) 1.4 ppb (1) N/A 12.0 ppb (11) N/A N/A 25.0 ppb (19) 0.26 ppb (3) 10.0 μg/m3 (9) N/A 19.0
 
March 21, 2019, 11 a.m. 7.5 ppb (7) 0.9 ppb (1) N/A 7.0 ppb (6) N/A N/A 34.0 ppb (26) 0.17 ppb (2) 5.0 μg/m3 (5) N/A 26.0
 
March 21, 2019, 10 a.m. 11.3 ppb (10) 1.2 ppb (1) N/A 10.0 ppb (9) N/A N/A 28.0 ppb (22) 0.18 ppb (2) 3.0 μg/m3 (3) N/A 22.0
 
March 21, 2019, 9 a.m. 15.5 ppb (14) 1.2 ppb (1) N/A 14.0 ppb (13) N/A N/A 23.0 ppb (18) 0.22 ppb (2) 3.0 μg/m3 (3) N/A 18.0
 
March 21, 2019, 8 a.m. 11.7 ppb (11) 1.0 ppb (1) N/A 11.0 ppb (10) N/A N/A 28.0 ppb (22) 0.19 ppb (2) 6.0 μg/m3 (5) N/A 22.0
 
March 21, 2019, 7 a.m. 14.1 ppb (13) 1.0 ppb (1) N/A 13.0 ppb (12) N/A N/A 25.0 ppb (19) 0.18 ppb (2) 3.0 μg/m3 (3) N/A 19.0
 
March 21, 2019, 6 a.m. 11.1 ppb (10) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A 29.0 ppb (22) 0.2 ppb (2) 1.0 μg/m3 (1) N/A 22.0
 
March 21, 2019, 5 a.m. 10.4 ppb (10) 1.0 ppb (1) N/A 9.0 ppb (8) N/A N/A 30.0 ppb (23) 0.23 ppb (3) 2.0 μg/m3 (2) N/A 23.0
 
March 21, 2019, 4 a.m. 12.9 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A N/A 27.0 ppb (21) 0.24 ppb (3) 5.0 μg/m3 (5) N/A 21.0
 
March 21, 2019, 3 a.m. 13.3 ppb (12) 1.1 ppb (1) N/A 12.0 ppb (11) N/A N/A 30.0 ppb (23) 0.22 ppb (2) 5.0 μg/m3 (5) N/A 23.0
 
March 21, 2019, 2 a.m. 9.1 ppb (8) 1.7 ppb (2) N/A 7.0 ppb (6) N/A N/A 38.0 ppb (29) 0.2 ppb (2) 2.0 μg/m3 (2) N/A 29.0
 
March 21, 2019, 1 a.m. 10.1 ppb (9) 1.2 ppb (1) N/A 9.0 ppb (8) N/A N/A 41.0 ppb (32) 0.24 ppb (3) 1.0 μg/m3 (1) N/A 32.0
 
March 21, 2019, midnight 8.9 ppb (8) 1.4 ppb (1) N/A 7.0 ppb (6) N/A N/A 45.0 ppb (35) 0.22 ppb (2) 3.0 μg/m3 (3) N/A 35.0
 
March 20, 2019, 11 p.m. 7.3 ppb (7) 1.3 ppb (1) N/A 6.0 ppb (6) N/A N/A 44.0 ppb (34) 0.2 ppb (2) 5.0 μg/m3 (5) N/A 34.0
 
March 20, 2019, 10 p.m. 9.4 ppb (9) 1.4 ppb (1) N/A 8.0 ppb (7) N/A N/A 44.0 ppb (34) 0.21 ppb (2) 10.0 μg/m3 (9) N/A 34.0
 
March 20, 2019, 9 p.m. 9.2 ppb (9) 1.6 ppb (1) N/A 8.0 ppb (7) N/A N/A 48.0 ppb (37) 0.17 ppb (2) 21.0 μg/m3 (19) N/A 37.0
 
March 20, 2019, 8 p.m. 2.8 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A N/A 56.0 ppb (43) 0.12 ppb (1) 5.0 μg/m3 (5) N/A 43.0
 
March 20, 2019, 7 p.m. 4.1 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A N/A 52.0 ppb (40) 0.13 ppb (1) 10.0 μg/m3 (9) N/A 40.0
 
March 20, 2019, 6 p.m. 6.2 ppb (6) 2.1 ppb (2) N/A 4.0 ppb (4) N/A N/A 47.0 ppb (36) 0.14 ppb (2) 15.0 μg/m3 (14) N/A 36.0
 
March 20, 2019, 5 p.m. 6.4 ppb (6) 2.1 ppb (2) N/A 4.0 ppb (4) N/A N/A 43.0 ppb (33) 0.14 ppb (2) 14.0 μg/m3 (13) N/A 33.0
 
March 20, 2019, 4 p.m. 13.2 ppb (12) 4.2 ppb (4) N/A 9.0 ppb (8) N/A N/A 34.0 ppb (26) 0.18 ppb (2) 21.0 μg/m3 (19) N/A 26.0
 
March 20, 2019, 3 p.m. 22.7 ppb (21) 6.1 ppb (6) N/A 17.0 ppb (16) N/A N/A 21.0 ppb (16) 0.28 ppb (3) 30.0 μg/m3 (27) N/A 27.0
 
March 20, 2019, 2 p.m. 19.6 ppb (18) 2.8 ppb (3) N/A 17.0 ppb (16) N/A N/A 21.0 ppb (16) 0.26 ppb (3) 31.0 μg/m3 (28) N/A 28.0
 
March 20, 2019, 1 p.m. 12.8 ppb (12) 1.4 ppb (1) N/A 11.0 ppb (10) N/A N/A 30.0 ppb (23) 0.2 ppb (2) 20.0 μg/m3 (18) N/A 23.0
 
March 20, 2019, noon 17.6 ppb (16) 2.3 ppb (2) N/A 15.0 ppb (14) N/A N/A 28.0 ppb (22) 0.18 ppb (2) 14.0 μg/m3 (13) N/A 22.0
 
March 20, 2019, 11 a.m. 7.9 ppb (7) 1.1 ppb (1) N/A 7.0 ppb (6) N/A N/A 39.0 ppb (30) 0.16 ppb (2) 13.0 μg/m3 (12) N/A 30.0
 
March 20, 2019, 10 a.m. 3.9 ppb (4) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A 44.0 ppb (34) 0.14 ppb (2) 12.0 μg/m3 (11) N/A 34.0
 
March 20, 2019, 9 a.m. 4.3 ppb (4) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A 43.0 ppb (33) 0.14 ppb (2) 12.0 μg/m3 (11) N/A 33.0
 
March 20, 2019, 8 a.m. 4.3 ppb (4) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A 43.0 ppb (33) 0.14 ppb (2) 15.0 μg/m3 (14) N/A 33.0
 
March 20, 2019, 7 a.m. 3.9 ppb (4) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A 45.0 ppb (35) 0.14 ppb (2) 12.0 μg/m3 (11) N/A 35.0
 
March 20, 2019, 6 a.m. 4.1 ppb (4) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A 46.0 ppb (35) 0.15 ppb (2) 15.0 μg/m3 (14) N/A 35.0
 
March 20, 2019, 5 a.m. 11.3 ppb (10) 1.1 ppb (1) N/A 10.0 ppb (9) N/A N/A 34.0 ppb (26) 0.21 ppb (2) 23.0 μg/m3 (21) N/A 26.0
 
March 20, 2019, 4 a.m. 13.4 ppb (12) 1.2 ppb (1) N/A 12.0 ppb (11) N/A N/A 34.0 ppb (26) 0.24 ppb (3) 25.0 μg/m3 (23) N/A 26.0
 
March 20, 2019, 3 a.m. 12.9 ppb (12) 1.2 ppb (1) N/A 12.0 ppb (11) N/A N/A 39.0 ppb (30) 0.23 ppb (3) 28.0 μg/m3 (25) N/A 30.0
 
March 20, 2019, 2 a.m. 11.6 ppb (11) 1.1 ppb (1) N/A 10.0 ppb (9) N/A N/A 45.0 ppb (35) 0.23 ppb (3) 23.0 μg/m3 (21) N/A 35.0
 
March 20, 2019, 1 a.m. 11.9 ppb (11) 1.2 ppb (1) N/A 11.0 ppb (10) N/A N/A 52.0 ppb (40) 0.22 ppb (2) 26.0 μg/m3 (24) N/A 40.0
 
March 20, 2019, midnight 11.4 ppb (11) 1.6 ppb (1) N/A 10.0 ppb (9) N/A N/A 61.0 ppb (47) 0.22 ppb (2) 25.0 μg/m3 (23) N/A 47.0
 
March 19, 2019, 11 p.m. 9.6 ppb (9) 1.7 ppb (2) N/A 8.0 ppb (7) N/A N/A 67.0 ppb (52) 0.23 ppb (3) 29.0 μg/m3 (26) N/A 52.0
 
March 19, 2019, 10 p.m. 10.2 ppb (9) 1.9 ppb (2) N/A 8.0 ppb (7) N/A N/A 70.0 ppb (54) 0.25 ppb (3) 44.0 μg/m3 (40) N/A 54.0
 
March 19, 2019, 9 p.m. 15.5 ppb (14) 3.1 ppb (3) N/A 12.0 ppb (11) N/A N/A 64.0 ppb (49) 0.28 ppb (3) 39.0 μg/m3 (35) N/A 49.0
 
March 19, 2019, 8 p.m. 17.2 ppb (16) 4.1 ppb (4) N/A 13.0 ppb (12) N/A N/A 56.0 ppb (43) 0.22 ppb (2) 28.0 μg/m3 (25) N/A 43.0
 
March 19, 2019, 7 p.m. 22.9 ppb (21) 5.8 ppb (5) N/A 17.0 ppb (16) N/A N/A 48.0 ppb (37) 0.24 ppb (3) 19.0 μg/m3 (17) N/A 37.0
 
March 19, 2019, 6 p.m. 43.0 ppb (40) 14.0 ppb (13) N/A 29.0 ppb (27) N/A N/A 32.0 ppb (25) 0.34 ppb (4) 35.0 μg/m3 (32) N/A 40.0
 
March 19, 2019, 5 p.m. 58.5 ppb (55) 24.4 ppb (23) N/A 34.0 ppb (31) N/A N/A 21.0 ppb (16) 0.41 ppb (5) 39.0 μg/m3 (35) N/A 55.0
 
March 19, 2019, 4 p.m. 51.2 ppb (47) 21.6 ppb (20) N/A 30.0 ppb (28) N/A N/A 20.0 ppb (15) 0.45 ppb (5) 42.0 μg/m3 (38) N/A 47.0
 
March 19, 2019, 3 p.m. 46.2 ppb (43) 20.6 ppb (19) N/A 26.0 ppb (24) N/A N/A 14.0 ppb (11) 0.57 ppb (6) 38.0 μg/m3 (35) N/A 43.0
 
March 19, 2019, 2 p.m. 52.3 ppb (48) 26.3 ppb (24) N/A 26.0 ppb (24) N/A N/A 5.0 ppb (4) 0.69 ppb (8) 55.0 μg/m3 (50) N/A 50.0
 
March 19, 2019, 1 p.m. 53.3 ppb (49) 27.3 ppb (25) N/A 26.0 ppb (24) N/A N/A 3.0 ppb (2) 0.6 ppb (7) 67.0 μg/m3 (56) N/A 56.0
 
March 19, 2019, noon 43.2 ppb (40) 17.7 ppb (16) N/A 25.0 ppb (23) N/A N/A 3.0 ppb (2) 0.55 ppb (6) 42.0 μg/m3 (38) N/A 40.0
 
March 19, 2019, 11 a.m. 30.6 ppb (28) 6.0 ppb (6) N/A 25.0 ppb (23) N/A N/A 4.0 ppb (3) 0.39 ppb (4) 46.0 μg/m3 (42) N/A 42.0
 
March 19, 2019, 10 a.m. 28.9 ppb (27) 3.4 ppb (3) N/A 26.0 ppb (24) N/A N/A 9.0 ppb (7) 0.33 ppb (4) 38.0 μg/m3 (35) N/A 35.0
 
March 19, 2019, 9 a.m. 27.1 ppb (25) 2.7 ppb (3) N/A 24.0 ppb (22) N/A N/A 10.0 ppb (8) 0.36 ppb (4) 42.0 μg/m3 (38) N/A 38.0
 
March 19, 2019, 8 a.m. 18.8 ppb (17) 1.9 ppb (2) N/A 17.0 ppb (16) N/A N/A 19.0 ppb (15) 0.24 ppb (3) 28.0 μg/m3 (25) N/A 25.0
 
March 19, 2019, 7 a.m. 27.9 ppb (26) 2.3 ppb (2) N/A 26.0 ppb (24) N/A N/A 9.0 ppb (7) 0.34 ppb (4) 41.0 μg/m3 (37) N/A 37.0
 
March 19, 2019, 6 a.m. 28.0 ppb (26) 2.5 ppb (2) N/A 25.0 ppb (23) N/A N/A 12.0 ppb (9) 0.39 ppb (4) 26.0 μg/m3 (24) N/A 26.0
 
March 19, 2019, 5 a.m. 31.3 ppb (29) 2.0 ppb (2) N/A 29.0 ppb (27) N/A N/A 20.0 ppb (15) 0.36 ppb (4) 31.0 μg/m3 (28) N/A 29.0
 
March 19, 2019, 4 a.m. 27.4 ppb (25) 1.6 ppb (1) N/A 26.0 ppb (24) N/A N/A 34.0 ppb (26) 0.36 ppb (4) 30.0 μg/m3 (27) N/A 27.0
 
March 19, 2019, 3 a.m. 17.8 ppb (16) 1.4 ppb (1) N/A 16.0 ppb (15) N/A N/A 50.0 ppb (38) 0.29 ppb (3) 29.0 μg/m3 (26) N/A 38.0
 
March 19, 2019, 2 a.m. 12.5 ppb (12) 1.0 ppb (1) N/A 11.0 ppb (10) N/A N/A 58.0 ppb (45) 0.25 ppb (3) 28.0 μg/m3 (25) N/A 45.0
 
March 19, 2019, 1 a.m. 11.5 ppb (11) 1.1 ppb (1) N/A 10.0 ppb (9) N/A N/A 59.0 ppb (45) 0.23 ppb (3) 26.0 μg/m3 (24) N/A 45.0
 
March 19, 2019, midnight 10.1 ppb (9) 1.5 ppb (1) N/A 9.0 ppb (8) N/A N/A 67.0 ppb (52) 0.22 ppb (2) 39.0 μg/m3 (35) N/A 52.0
 
March 18, 2019, 11 p.m. 7.9 ppb (7) 1.5 ppb (1) N/A 6.0 ppb (6) N/A N/A 69.0 ppb (53) 0.2 ppb (2) 32.0 μg/m3 (29) N/A 53.0
 
March 18, 2019, 10 p.m. 4.3 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A 65.0 ppb (50) 0.14 ppb (2) 15.0 μg/m3 (14) N/A 50.0
 
March 18, 2019, 9 p.m. 4.0 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A 60.0 ppb (46) 0.12 ppb (1) 9.0 μg/m3 (8) N/A 46.0
 
March 18, 2019, 8 p.m. 4.3 ppb (4) 1.4 ppb (1) N/A 3.0 ppb (3) N/A N/A 58.0 ppb (45) 0.12 ppb (1) 5.0 μg/m3 (5) N/A 45.0
 
March 18, 2019, 7 p.m. 9.4 ppb (9) 2.7 ppb (3) N/A 7.0 ppb (6) N/A N/A 53.0 ppb (41) 0.14 ppb (2) 11.0 μg/m3 (10) N/A 41.0
 
March 18, 2019, 6 p.m. 14.2 ppb (13) 3.9 ppb (4) N/A 10.0 ppb (9) N/A N/A 47.0 ppb (36) 0.2 ppb (2) 14.0 μg/m3 (13) N/A 36.0
 
March 18, 2019, 5 p.m. 20.7 ppb (19) 6.3 ppb (6) N/A 14.0 ppb (13) N/A N/A 38.0 ppb (29) 0.25 ppb (3) 18.0 μg/m3 (16) N/A 29.0
 
March 18, 2019, 4 p.m. 30.2 ppb (28) 11.0 ppb (10) N/A 19.0 ppb (18) N/A N/A 25.0 ppb (19) 0.37 ppb (4) 32.0 μg/m3 (29) N/A 29.0
 
March 18, 2019, 3 p.m. 51.8 ppb (48) 26.0 ppb (24) N/A 26.0 ppb (24) N/A N/A 12.0 ppb (9) 0.64 ppb (7) 48.0 μg/m3 (44) N/A 48.0
 
March 18, 2019, 2 p.m. 53.0 ppb (49) 28.9 ppb (27) N/A 24.0 ppb (22) N/A N/A 5.0 ppb (4) 0.84 ppb (9) 34.0 μg/m3 (31) N/A 49.0
 
March 18, 2019, 1 p.m. 49.7 ppb (46) 26.5 ppb (25) N/A 23.0 ppb (21) N/A N/A 4.0 ppb (3) 0.73 ppb (8) 33.0 μg/m3 (30) N/A 46.0
 
March 18, 2019, noon 41.8 ppb (39) 19.9 ppb (18) N/A 22.0 ppb (20) N/A N/A 4.0 ppb (3) 0.63 ppb (7) 37.0 μg/m3 (34) N/A 39.0
 
March 18, 2019, 11 a.m. 37.5 ppb (35) 12.7 ppb (12) N/A 25.0 ppb (23) N/A N/A 4.0 ppb (3) 0.66 ppb (7) 28.0 μg/m3 (25) N/A 35.0
 
March 18, 2019, 10 a.m. 34.7 ppb (32) 8.8 ppb (8) N/A 26.0 ppb (24) N/A N/A 4.0 ppb (3) 0.63 ppb (7) 27.0 μg/m3 (25) N/A 32.0
 
March 18, 2019, 9 a.m. 31.8 ppb (29) 7.7 ppb (7) N/A 24.0 ppb (22) N/A N/A 5.0 ppb (4) 0.59 ppb (7) 33.0 μg/m3 (30) N/A 30.0
 
March 18, 2019, 8 a.m. 26.5 ppb (25) 2.9 ppb (3) N/A 24.0 ppb (22) N/A N/A 7.0 ppb (5) 0.47 ppb (5) 28.0 μg/m3 (25) N/A 25.0
 
March 18, 2019, 7 a.m. 23.1 ppb (21) 2.3 ppb (2) N/A 21.0 ppb (19) N/A N/A 13.0 ppb (10) 0.42 ppb (5) 31.0 μg/m3 (28) N/A 28.0
 
March 18, 2019, 6 a.m. 12.9 ppb (12) 1.2 ppb (1) N/A 12.0 ppb (11) N/A N/A 26.0 ppb (20) 0.27 ppb (3) 23.0 μg/m3 (21) N/A 21.0
 
March 18, 2019, 5 a.m. 14.4 ppb (13) 1.4 ppb (1) N/A 13.0 ppb (12) N/A N/A 30.0 ppb (23) 0.29 ppb (3) 30.0 μg/m3 (27) N/A 27.0
 
March 18, 2019, 4 a.m. 19.6 ppb (18) 1.2 ppb (1) N/A 18.0 ppb (17) N/A N/A 37.0 ppb (28) 0.41 ppb (5) 25.0 μg/m3 (23) N/A 28.0
 
March 18, 2019, 3 a.m. 14.1 ppb (13) 1.1 ppb (1) N/A 13.0 ppb (12) N/A N/A 51.0 ppb (39) 0.3 ppb (3) 29.0 μg/m3 (26) N/A 39.0
 
March 18, 2019, 2 a.m. 14.7 ppb (14) 1.1 ppb (1) N/A 14.0 ppb (13) N/A N/A 54.0 ppb (42) 0.3 ppb (3) 26.0 μg/m3 (24) N/A 42.0
 
March 18, 2019, 1 a.m. 4.7 ppb (4) 0.8 ppb (1) N/A 4.0 ppb (4) N/A N/A 53.0 ppb (41) 0.14 ppb (2) 12.0 μg/m3 (11) N/A 41.0
 
March 18, 2019, midnight 1.5 ppb (1) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A 57.0 ppb (44) 0.12 ppb (1) 14.0 μg/m3 (13) N/A 44.0
 
March 17, 2019, 11 p.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 57.0 ppb (44) 0.12 ppb (1) 7.0 μg/m3 (6) N/A 44.0
 
March 17, 2019, 10 p.m. 1.5 ppb (1) 0.8 ppb (1) N/A 1.0 ppb (1) N/A N/A 58.0 ppb (45) 0.12 ppb (1) 11.0 μg/m3 (10) N/A 45.0
 
March 17, 2019, 9 p.m. 2.1 ppb (2) 0.8 ppb (1) N/A 1.0 ppb (1) N/A N/A 61.0 ppb (47) 0.12 ppb (1) 10.0 μg/m3 (9) N/A 47.0
 
March 17, 2019, 8 p.m. 2.6 ppb (2) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A 60.0 ppb (46) 0.12 ppb (1) 11.0 μg/m3 (10) N/A 46.0
 
March 17, 2019, 7 p.m. 3.1 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 56.0 ppb (43) 0.12 ppb (1) 9.0 μg/m3 (8) N/A 43.0
 
March 17, 2019, 6 p.m. 5.6 ppb (5) 1.6 ppb (1) N/A 4.0 ppb (4) N/A N/A 52.0 ppb (40) 0.14 ppb (2) 8.0 μg/m3 (7) N/A 40.0
 
March 17, 2019, 5 p.m. 8.2 ppb (8) 2.5 ppb (2) N/A 6.0 ppb (6) N/A N/A 45.0 ppb (35) 0.16 ppb (2) 8.0 μg/m3 (7) N/A 35.0
 
March 17, 2019, 4 p.m. 15.1 ppb (14) 4.9 ppb (5) N/A 10.0 ppb (9) N/A N/A 32.0 ppb (25) 0.24 ppb (3) 23.0 μg/m3 (21) N/A 25.0
 
March 17, 2019, 3 p.m. 27.9 ppb (26) 10.7 ppb (10) N/A 17.0 ppb (16) N/A N/A 18.0 ppb (14) 0.47 ppb (5) 24.0 μg/m3 (22) N/A 26.0
 
March 17, 2019, 2 p.m. 28.1 ppb (26) 8.5 ppb (8) N/A 20.0 ppb (19) N/A N/A 9.0 ppb (7) 0.49 ppb (5) 16.0 μg/m3 (15) N/A 26.0