AQSQID: 060070008

Site Name: Chico - East

Location: Chico, CA

Reporting: True, Located: True

Current AQI: 25.0

Chico CA, US: 39.76161, -121.84048

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 25, 2019, 8 p.m. 21.1 ppb (20) 4.1 ppb (4) N/A 17.0 ppb (16) N/A N/A 32.0 ppb (25) 0.23 ppb (3) 23.0 μg/m3 (21) 4.0 μg/m3 (17) 25.0
 
March 25, 2019, 7 p.m. 21.1 ppb (20) 4.4 ppb (4) N/A 17.0 ppb (16) N/A N/A 29.0 ppb (22) 0.24 ppb (3) N/A 4.0 μg/m3 (17) 22.0
 
March 25, 2019, 6 p.m. 22.6 ppb (21) 5.9 ppb (5) N/A 17.0 ppb (16) N/A N/A 27.0 ppb (21) 0.22 ppb (2) N/A 4.0 μg/m3 (17) 21.0
 
March 25, 2019, 5 p.m. 24.3 ppb (23) 7.1 ppb (7) N/A 17.0 ppb (16) N/A N/A 18.0 ppb (14) 0.25 ppb (3) N/A 5.0 μg/m3 (21) 23.0
 
March 25, 2019, 4 p.m. 24.5 ppb (23) 6.7 ppb (6) N/A 18.0 ppb (17) N/A N/A 14.0 ppb (11) 0.28 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 25, 2019, 3 p.m. 25.9 ppb (24) 7.6 ppb (7) N/A 18.0 ppb (17) N/A N/A 18.0 ppb (14) 0.27 ppb (3) N/A 3.0 μg/m3 (12) 24.0
 
March 25, 2019, 2 p.m. 25.5 ppb (24) 6.9 ppb (6) N/A 19.0 ppb (18) N/A N/A 13.0 ppb (10) 0.33 ppb (4) N/A 4.0 μg/m3 (17) 24.0
 
March 25, 2019, 1 p.m. 24.4 ppb (23) 6.3 ppb (6) N/A 18.0 ppb (17) N/A N/A 16.0 ppb (12) 0.3 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 25, 2019, noon 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 25, 2019, 11 a.m. 24.7 ppb (23) 7.0 ppb (6) N/A 18.0 ppb (17) N/A N/A 35.0 ppb (27) 0.17 ppb (2) N/A 2.0 μg/m3 (8) 27.0
 
March 25, 2019, 10 a.m. 25.3 ppb (23) 8.1 ppb (8) N/A 17.0 ppb (16) N/A N/A 38.0 ppb (29) 0.17 ppb (2) N/A 1.0 μg/m3 (4) 29.0
 
March 25, 2019, 9 a.m. 25.7 ppb (24) 8.7 ppb (8) N/A 17.0 ppb (16) N/A N/A 28.0 ppb (22) 0.17 ppb (2) N/A 3.0 μg/m3 (12) 24.0
 
March 25, 2019, 8 a.m. 26.3 ppb (24) 8.6 ppb (8) N/A 18.0 ppb (17) N/A N/A 23.0 ppb (18) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 24.0
 
March 25, 2019, 7 a.m. 27.2 ppb (25) 8.1 ppb (8) N/A 19.0 ppb (18) N/A N/A 14.0 ppb (11) 0.23 ppb (3) N/A 5.0 μg/m3 (21) 25.0
 
March 25, 2019, 6 a.m. 27.4 ppb (25) 7.3 ppb (7) N/A 20.0 ppb (19) N/A N/A 20.0 ppb (15) 0.2 ppb (2) N/A 3.0 μg/m3 (12) 25.0
 
March 25, 2019, 5 a.m. 28.1 ppb (26) 7.0 ppb (6) N/A 21.0 ppb (19) N/A N/A 24.0 ppb (18) 0.19 ppb (2) N/A 2.0 μg/m3 (8) 26.0
 
March 25, 2019, 4 a.m. 29.0 ppb (27) 6.4 ppb (6) N/A 23.0 ppb (21) N/A N/A 25.0 ppb (19) 0.21 ppb (2) N/A 4.0 μg/m3 (17) 27.0
 
March 25, 2019, 3 a.m. 30.0 ppb (28) 5.9 ppb (5) N/A 24.0 ppb (22) N/A N/A 28.0 ppb (22) 0.22 ppb (2) N/A 3.0 μg/m3 (12) 28.0
 
March 25, 2019, 2 a.m. 30.4 ppb (28) 5.3 ppb (5) N/A 25.0 ppb (23) N/A N/A 33.0 ppb (25) 0.29 ppb (3) N/A 2.0 μg/m3 (8) 28.0
 
March 25, 2019, 1 a.m. 28.5 ppb (26) 4.2 ppb (4) N/A 24.0 ppb (22) N/A N/A 43.0 ppb (33) 0.21 ppb (2) N/A 5.0 μg/m3 (21) 33.0
 
March 25, 2019, midnight 27.9 ppb (26) 4.1 ppb (4) N/A 24.0 ppb (22) N/A N/A 45.0 ppb (35) 0.2 ppb (2) N/A 5.0 μg/m3 (21) 35.0
 
March 24, 2019, 11 p.m. 27.7 ppb (26) 4.3 ppb (4) N/A 24.0 ppb (22) N/A N/A 47.0 ppb (36) 0.19 ppb (2) N/A 3.0 μg/m3 (12) 36.0
 
March 24, 2019, 10 p.m. 27.5 ppb (25) 4.6 ppb (4) N/A 23.0 ppb (21) N/A N/A 46.0 ppb (35) 0.19 ppb (2) N/A 2.0 μg/m3 (8) 35.0
 
March 24, 2019, 9 p.m. 27.0 ppb (25) 4.8 ppb (4) N/A 22.0 ppb (20) N/A N/A 45.0 ppb (35) 0.18 ppb (2) N/A 3.0 μg/m3 (12) 35.0
 
March 24, 2019, 8 p.m. 26.0 ppb (24) 5.7 ppb (5) N/A 20.0 ppb (19) N/A N/A 43.0 ppb (33) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 33.0
 
March 24, 2019, 7 p.m. 25.2 ppb (23) 6.6 ppb (6) N/A 19.0 ppb (18) N/A N/A 40.0 ppb (31) 0.16 ppb (2) N/A 2.0 μg/m3 (8) 31.0
 
March 24, 2019, 6 p.m. 25.7 ppb (24) 8.8 ppb (8) N/A 17.0 ppb (16) N/A N/A 34.0 ppb (26) 0.17 ppb (2) N/A 3.0 μg/m3 (12) 26.0
 
March 24, 2019, 5 p.m. 26.0 ppb (24) 10.5 ppb (10) N/A 16.0 ppb (15) N/A N/A 27.0 ppb (21) 0.18 ppb (2) N/A 4.0 μg/m3 (17) 24.0
 
March 24, 2019, 4 p.m. 26.4 ppb (24) 12.0 ppb (11) N/A 14.0 ppb (13) N/A N/A 19.0 ppb (15) 0.21 ppb (2) N/A 5.0 μg/m3 (21) 24.0
 
March 24, 2019, 3 p.m. 27.0 ppb (25) 12.9 ppb (12) N/A 14.0 ppb (13) N/A N/A 9.0 ppb (7) 0.31 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 24, 2019, 2 p.m. 25.3 ppb (23) 11.6 ppb (11) N/A 14.0 ppb (13) N/A N/A 2.0 ppb (2) 0.36 ppb (4) N/A 5.0 μg/m3 (21) 23.0
 
March 24, 2019, 1 p.m. 22.4 ppb (21) 9.0 ppb (8) N/A 13.0 ppb (12) N/A N/A 2.0 ppb (2) 0.35 ppb (4) N/A 4.0 μg/m3 (17) 21.0
 
March 24, 2019, noon 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 24, 2019, 11 a.m. 21.8 ppb (20) 7.9 ppb (7) N/A 14.0 ppb (13) N/A N/A 7.0 ppb (5) 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 24, 2019, 10 a.m. 22.0 ppb (20) 7.6 ppb (7) N/A 14.0 ppb (13) N/A N/A 8.0 ppb (6) 0.28 ppb (3) N/A 4.0 μg/m3 (17) 20.0
 
March 24, 2019, 9 a.m. 22.9 ppb (21) 8.0 ppb (7) N/A 15.0 ppb (14) N/A N/A 14.0 ppb (11) 0.27 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 24, 2019, 8 a.m. 23.5 ppb (22) 7.8 ppb (7) N/A 16.0 ppb (15) N/A N/A 14.0 ppb (11) 0.32 ppb (4) N/A 5.0 μg/m3 (21) 22.0
 
March 24, 2019, 7 a.m. 23.4 ppb (22) 7.1 ppb (7) N/A 16.0 ppb (15) N/A N/A 11.0 ppb (8) 0.32 ppb (4) N/A 3.0 μg/m3 (12) 22.0
 
March 24, 2019, 6 a.m. 23.9 ppb (22) 6.4 ppb (6) N/A 18.0 ppb (17) N/A N/A 15.0 ppb (12) 0.28 ppb (3) N/A 2.0 μg/m3 (8) 22.0
 
March 24, 2019, 5 a.m. 24.4 ppb (23) 5.9 ppb (5) N/A 19.0 ppb (18) N/A N/A 22.0 ppb (17) 0.23 ppb (3) N/A 4.0 μg/m3 (17) 23.0
 
March 24, 2019, 4 a.m. 25.4 ppb (24) 5.6 ppb (5) N/A 20.0 ppb (19) N/A N/A 23.0 ppb (18) 0.29 ppb (3) N/A 2.0 μg/m3 (8) 24.0
 
March 24, 2019, 3 a.m. 25.4 ppb (24) 4.6 ppb (4) N/A 21.0 ppb (19) N/A N/A 22.0 ppb (17) 0.37 ppb (4) N/A 3.0 μg/m3 (12) 24.0
 
March 24, 2019, 2 a.m. 24.2 ppb (22) 4.3 ppb (4) N/A 20.0 ppb (19) N/A N/A 41.0 ppb (32) 0.23 ppb (3) N/A 3.0 μg/m3 (12) 32.0
 
March 24, 2019, 1 a.m. 23.7 ppb (22) 4.7 ppb (4) N/A 19.0 ppb (18) N/A N/A 48.0 ppb (37) 0.18 ppb (2) N/A 4.0 μg/m3 (17) 37.0
 
March 24, 2019, midnight 23.1 ppb (21) 4.5 ppb (4) N/A 19.0 ppb (18) N/A N/A 50.0 ppb (38) 0.18 ppb (2) N/A 5.0 μg/m3 (21) 38.0
 
March 23, 2019, 11 p.m. 22.9 ppb (21) 4.4 ppb (4) N/A 19.0 ppb (18) N/A N/A 50.0 ppb (38) 0.17 ppb (2) N/A 3.0 μg/m3 (12) 38.0
 
March 23, 2019, 10 p.m. 23.0 ppb (21) 4.3 ppb (4) N/A 19.0 ppb (18) N/A N/A 48.0 ppb (37) 0.17 ppb (2) N/A 3.0 μg/m3 (12) 37.0
 
March 23, 2019, 9 p.m. 22.5 ppb (21) 3.7 ppb (3) N/A 19.0 ppb (18) N/A N/A 42.0 ppb (32) 0.21 ppb (2) N/A 1.0 μg/m3 (4) 32.0
 
March 23, 2019, 8 p.m. 22.1 ppb (20) 3.7 ppb (3) N/A 18.0 ppb (17) N/A N/A 46.0 ppb (35) 0.18 ppb (2) N/A 0.0 μg/m3 (0) 35.0
 
March 23, 2019, 7 p.m. 23.2 ppb (21) 4.5 ppb (4) N/A 19.0 ppb (18) N/A N/A 42.0 ppb (32) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 32.0
 
March 23, 2019, 6 p.m. 24.0 ppb (22) 5.4 ppb (5) N/A 19.0 ppb (18) N/A N/A 43.0 ppb (33) 0.19 ppb (2) N/A 3.0 μg/m3 (12) 33.0
 
March 23, 2019, 5 p.m. 23.9 ppb (22) 6.0 ppb (6) N/A 18.0 ppb (17) N/A N/A 43.0 ppb (33) 0.19 ppb (2) N/A 3.0 μg/m3 (12) 33.0
 
March 23, 2019, 4 p.m. 23.9 ppb (22) 6.1 ppb (6) N/A 18.0 ppb (17) N/A N/A 37.0 ppb (28) 0.21 ppb (2) N/A 4.0 μg/m3 (17) 28.0
 
March 23, 2019, 3 p.m. 24.2 ppb (22) 5.7 ppb (5) N/A 19.0 ppb (18) N/A N/A 29.0 ppb (22) 0.25 ppb (3) N/A 5.0 μg/m3 (21) 22.0
 
March 23, 2019, 2 p.m. 23.6 ppb (22) 5.3 ppb (5) N/A 18.0 ppb (17) N/A N/A 27.0 ppb (21) 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 23, 2019, 1 p.m. 22.8 ppb (21) 5.6 ppb (5) N/A 17.0 ppb (16) N/A N/A 33.0 ppb (25) 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 23, 2019, noon 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, 11 a.m. 23.8 ppb (22) 5.8 ppb (5) N/A 18.0 ppb (17) N/A N/A 36.0 ppb (28) 0.17 ppb (2) N/A 0.0 μg/m3 (0) 28.0
 
March 23, 2019, 10 a.m. 23.7 ppb (22) 5.8 ppb (5) N/A 18.0 ppb (17) N/A N/A 36.0 ppb (28) 0.18 ppb (2) N/A -1.0 μg/m3 (0) 28.0
 
March 23, 2019, 9 a.m. 24.3 ppb (23) 5.9 ppb (5) N/A 19.0 ppb (18) N/A N/A 39.0 ppb (30) 0.18 ppb (2) N/A 0.0 μg/m3 (0) 30.0
 
March 23, 2019, 8 a.m. 24.8 ppb (23) 6.1 ppb (6) N/A 19.0 ppb (18) N/A N/A 39.0 ppb (30) 0.18 ppb (2) N/A 2.0 μg/m3 (8) 30.0
 
March 23, 2019, 7 a.m. 24.6 ppb (23) 5.8 ppb (5) N/A 19.0 ppb (18) N/A N/A 32.0 ppb (25) 0.25 ppb (3) N/A 1.0 μg/m3 (4) 25.0
 
March 23, 2019, 6 a.m. 25.0 ppb (23) 5.9 ppb (5) N/A 19.0 ppb (18) N/A N/A 36.0 ppb (28) 0.2 ppb (2) N/A 2.0 μg/m3 (8) 28.0
 
March 23, 2019, 5 a.m. 25.6 ppb (24) 5.5 ppb (5) N/A 20.0 ppb (19) N/A N/A 32.0 ppb (25) 0.24 ppb (3) N/A 3.0 μg/m3 (12) 25.0
 
March 23, 2019, 4 a.m. 25.4 ppb (24) 5.5 ppb (5) N/A 20.0 ppb (19) N/A N/A 37.0 ppb (28) 0.21 ppb (2) N/A 2.0 μg/m3 (8) 28.0
 
March 23, 2019, 3 a.m. 25.4 ppb (24) 5.5 ppb (5) N/A 20.0 ppb (19) N/A N/A 38.0 ppb (29) 0.22 ppb (2) N/A 5.0 μg/m3 (21) 29.0
 
March 23, 2019, 2 a.m. 25.1 ppb (23) 5.1 ppb (5) N/A 20.0 ppb (19) N/A N/A 33.0 ppb (25) 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 23, 2019, 1 a.m. 24.9 ppb (23) 5.2 ppb (5) N/A 20.0 ppb (19) N/A N/A 38.0 ppb (29) 0.22 ppb (2) N/A 3.0 μg/m3 (12) 29.0
 
March 23, 2019, midnight 24.9 ppb (23) 5.2 ppb (5) N/A 20.0 ppb (19) N/A N/A 40.0 ppb (31) 0.2 ppb (2) N/A 2.0 μg/m3 (8) 31.0
 
March 22, 2019, 11 p.m. 24.6 ppb (23) 4.8 ppb (4) N/A 20.0 ppb (19) N/A N/A 36.0 ppb (28) 0.21 ppb (2) N/A 0.0 μg/m3 (0) 28.0
 
March 22, 2019, 10 p.m. 25.0 ppb (23) 4.6 ppb (4) N/A 20.0 ppb (19) N/A N/A 37.0 ppb (28) 0.21 ppb (2) N/A 0.0 μg/m3 (0) 28.0
 
March 22, 2019, 9 p.m. 23.9 ppb (22) 4.8 ppb (4) N/A 19.0 ppb (18) N/A N/A 35.0 ppb (27) 0.23 ppb (3) N/A 0.0 μg/m3 (0) 27.0
 
March 22, 2019, 8 p.m. 22.3 ppb (21) 4.2 ppb (4) N/A 18.0 ppb (17) N/A N/A 35.0 ppb (27) 0.21 ppb (2) N/A -1.0 μg/m3 (0) 27.0
 
March 22, 2019, 7 p.m. 20.6 ppb (19) 3.6 ppb (3) N/A 17.0 ppb (16) N/A N/A 35.0 ppb (27) 0.2 ppb (2) N/A 1.0 μg/m3 (4) 27.0
 
March 22, 2019, 6 p.m. 17.3 ppb (16) 2.8 ppb (3) N/A 15.0 ppb (14) N/A N/A 35.0 ppb (27) 0.2 ppb (2) N/A N/A 27.0
 
March 22, 2019, 5 p.m. 18.1 ppb (17) 2.5 ppb (2) N/A 16.0 ppb (15) N/A N/A 35.0 ppb (27) 0.17 ppb (2) N/A N/A 27.0
 
March 22, 2019, 4 p.m. 22.1 ppb (20) 4.7 ppb (4) N/A 17.0 ppb (16) N/A N/A 31.0 ppb (24) 0.18 ppb (2) N/A N/A 24.0
 
March 22, 2019, 3 p.m. 24.1 ppb (22) 6.2 ppb (6) N/A 18.0 ppb (17) N/A N/A 26.0 ppb (20) 0.2 ppb (2) N/A N/A 22.0
 
March 22, 2019, 2 p.m. 24.4 ppb (23) 6.8 ppb (6) N/A 18.0 ppb (17) N/A N/A 23.0 ppb (18) 0.21 ppb (2) N/A N/A 23.0
 
March 22, 2019, 1 p.m. 24.3 ppb (23) 7.4 ppb (7) N/A 17.0 ppb (16) N/A N/A 20.0 ppb (15) 0.21 ppb (2) N/A N/A 23.0
 
March 22, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
March 22, 2019, 11 a.m. 24.8 ppb (23) 7.1 ppb (7) N/A 18.0 ppb (17) N/A N/A 17.0 ppb (13) 0.19 ppb (2) N/A N/A 23.0
 
March 22, 2019, 10 a.m. 25.3 ppb (23) 6.9 ppb (6) N/A 18.0 ppb (17) N/A N/A 24.0 ppb (18) 0.18 ppb (2) N/A N/A 23.0
 
March 22, 2019, 9 a.m. 26.2 ppb (24) 7.0 ppb (6) N/A 19.0 ppb (18) N/A N/A 25.0 ppb (19) 0.19 ppb (2) N/A N/A 24.0
 
March 22, 2019, 8 a.m. 26.9 ppb (25) 6.9 ppb (6) N/A 20.0 ppb (19) N/A N/A 28.0 ppb (22) 0.18 ppb (2) N/A N/A 25.0
 
March 22, 2019, 7 a.m. 28.6 ppb (26) 7.3 ppb (7) N/A 21.0 ppb (19) N/A N/A 30.0 ppb (23) 0.19 ppb (2) N/A N/A 26.0
 
March 22, 2019, 6 a.m. 29.5 ppb (27) 6.4 ppb (6) N/A 23.0 ppb (21) N/A N/A 29.0 ppb (22) 0.22 ppb (2) N/A N/A 27.0
 
March 22, 2019, 5 a.m. 31.0 ppb (29) 6.4 ppb (6) N/A 25.0 ppb (23) N/A N/A 30.0 ppb (23) 0.23 ppb (3) N/A N/A 29.0
 
March 22, 2019, 4 a.m. 32.2 ppb (30) 6.1 ppb (6) N/A 26.0 ppb (24) N/A N/A 30.0 ppb (23) 0.22 ppb (2) N/A N/A 30.0
 
March 22, 2019, 3 a.m. 33.6 ppb (31) 5.5 ppb (5) N/A 28.0 ppb (26) N/A N/A 30.0 ppb (23) 0.28 ppb (3) N/A N/A 31.0
 
March 22, 2019, 2 a.m. 32.8 ppb (30) 4.8 ppb (4) N/A 28.0 ppb (26) N/A N/A 42.0 ppb (32) 0.23 ppb (3) N/A N/A 32.0
 
March 22, 2019, 1 a.m. 32.5 ppb (30) 4.1 ppb (4) N/A 28.0 ppb (26) N/A N/A 48.0 ppb (37) 0.19 ppb (2) N/A N/A 37.0
 
March 22, 2019, midnight 32.1 ppb (30) 3.9 ppb (4) N/A 28.0 ppb (26) N/A N/A 48.0 ppb (37) 0.2 ppb (2) N/A N/A 37.0
 
March 21, 2019, 11 p.m. 30.9 ppb (29) 3.4 ppb (3) N/A 28.0 ppb (26) N/A N/A 49.0 ppb (38) 0.19 ppb (2) N/A N/A 38.0
 
March 21, 2019, 10 p.m. 30.0 ppb (28) 3.2 ppb (3) N/A 27.0 ppb (25) N/A N/A 49.0 ppb (38) 0.2 ppb (2) N/A N/A 38.0
 
March 21, 2019, 9 p.m. 28.2 ppb (26) 2.7 ppb (3) N/A 26.0 ppb (24) N/A N/A 47.0 ppb (36) 0.22 ppb (2) N/A N/A 36.0
 
March 21, 2019, 8 p.m. 26.0 ppb (24) 2.9 ppb (3) N/A 23.0 ppb (21) N/A N/A 45.0 ppb (35) 0.21 ppb (2) N/A N/A 35.0
 
March 21, 2019, 7 p.m. 26.5 ppb (25) 6.1 ppb (6) N/A 20.0 ppb (19) N/A N/A 41.0 ppb (32) 0.2 ppb (2) N/A N/A 32.0
 
March 21, 2019, 6 p.m. 27.3 ppb (25) 9.1 ppb (8) N/A 18.0 ppb (17) N/A N/A 36.0 ppb (28) 0.18 ppb (2) N/A N/A 28.0
 
March 21, 2019, 5 p.m. 29.8 ppb (28) 13.2 ppb (12) N/A 17.0 ppb (16) N/A N/A 29.0 ppb (22) 0.19 ppb (2) N/A N/A 28.0
 
March 21, 2019, 4 p.m. 30.1 ppb (28) 14.6 ppb (14) N/A 16.0 ppb (15) N/A N/A 17.0 ppb (13) 0.26 ppb (3) N/A N/A 28.0
 
March 21, 2019, 3 p.m. 29.5 ppb (27) 13.7 ppb (13) N/A 16.0 ppb (15) N/A N/A 6.0 ppb (5) 0.45 ppb (5) N/A N/A 27.0
 
March 21, 2019, 2 p.m. 26.2 ppb (24) 11.3 ppb (10) N/A 15.0 ppb (14) N/A N/A 5.0 ppb (4) 0.42 ppb (5) N/A N/A 24.0
 
March 21, 2019, 1 p.m. 23.8 ppb (22) 10.4 ppb (10) N/A 13.0 ppb (12) N/A N/A 10.0 ppb (8) 0.2 ppb (2) N/A N/A 22.0
 
March 21, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
March 21, 2019, 11 a.m. 24.8 ppb (23) 9.1 ppb (8) N/A 16.0 ppb (15) N/A N/A 6.0 ppb (5) 0.24 ppb (3) N/A N/A 23.0
 
March 21, 2019, 10 a.m. 25.1 ppb (23) 8.8 ppb (8) N/A 16.0 ppb (15) N/A N/A 11.0 ppb (8) 0.25 ppb (3) N/A N/A 23.0
 
March 21, 2019, 9 a.m. 25.7 ppb (24) 8.2 ppb (8) N/A 18.0 ppb (17) N/A N/A 16.0 ppb (12) 0.18 ppb (2) N/A N/A 24.0
 
March 21, 2019, 8 a.m. 26.1 ppb (24) 7.7 ppb (7) N/A 18.0 ppb (17) N/A N/A 18.0 ppb (14) 0.21 ppb (2) N/A N/A 24.0
 
March 21, 2019, 7 a.m. 26.9 ppb (25) 7.2 ppb (7) N/A 20.0 ppb (19) N/A N/A 21.0 ppb (16) 0.21 ppb (2) N/A N/A 25.0
 
March 21, 2019, 6 a.m. 27.4 ppb (25) 6.8 ppb (6) N/A 21.0 ppb (19) N/A N/A 32.0 ppb (25) 0.18 ppb (2) N/A N/A 25.0
 
March 21, 2019, 5 a.m. 28.5 ppb (26) 6.9 ppb (6) N/A 22.0 ppb (20) N/A N/A 44.0 ppb (34) 0.17 ppb (2) N/A N/A 34.0
 
March 21, 2019, 4 a.m. 28.8 ppb (27) 6.6 ppb (6) N/A 22.0 ppb (20) N/A N/A 38.0 ppb (29) 0.23 ppb (3) N/A N/A 29.0
 
March 21, 2019, 3 a.m. 28.8 ppb (27) 6.1 ppb (6) N/A 23.0 ppb (21) N/A N/A 42.0 ppb (32) 0.2 ppb (2) N/A N/A 32.0
 
March 21, 2019, 2 a.m. 29.0 ppb (27) 6.1 ppb (6) N/A 23.0 ppb (21) N/A N/A 45.0 ppb (35) 0.18 ppb (2) N/A N/A 35.0
 
March 21, 2019, 1 a.m. 29.1 ppb (27) 5.6 ppb (5) N/A 23.0 ppb (21) N/A N/A 47.0 ppb (36) 0.17 ppb (2) N/A N/A 36.0
 
March 21, 2019, midnight 28.7 ppb (27) 5.2 ppb (5) N/A 24.0 ppb (22) N/A N/A 48.0 ppb (37) 0.16 ppb (2) N/A N/A 37.0
 
March 20, 2019, 11 p.m. 28.4 ppb (26) 4.6 ppb (4) N/A 24.0 ppb (22) N/A N/A 49.0 ppb (38) 0.16 ppb (2) N/A N/A 38.0
 
March 20, 2019, 10 p.m. 27.5 ppb (25) 5.0 ppb (5) N/A 23.0 ppb (21) N/A N/A 50.0 ppb (38) 0.17 ppb (2) N/A N/A 38.0
 
March 20, 2019, 9 p.m. 26.7 ppb (25) 4.7 ppb (4) N/A 22.0 ppb (20) N/A N/A 47.0 ppb (36) 0.14 ppb (2) N/A N/A 36.0
 
March 20, 2019, 8 p.m. 26.1 ppb (24) 5.0 ppb (5) N/A 21.0 ppb (19) N/A N/A 44.0 ppb (34) 0.13 ppb (1) N/A N/A 34.0
 
March 20, 2019, 7 p.m. 26.2 ppb (24) 5.0 ppb (5) N/A 21.0 ppb (19) N/A N/A 42.0 ppb (32) 0.13 ppb (1) N/A N/A 32.0
 
March 20, 2019, 6 p.m. 25.8 ppb (24) 4.8 ppb (4) N/A 21.0 ppb (19) N/A N/A 38.0 ppb (29) 0.14 ppb (2) N/A N/A 29.0
 
March 20, 2019, 5 p.m. 26.1 ppb (24) 5.3 ppb (5) N/A 21.0 ppb (19) N/A N/A 38.0 ppb (29) 0.14 ppb (2) N/A N/A 29.0
 
March 20, 2019, 4 p.m. 26.6 ppb (25) 5.6 ppb (5) N/A 21.0 ppb (19) N/A N/A 38.0 ppb (29) 0.14 ppb (2) N/A N/A 29.0
 
March 20, 2019, 3 p.m. 26.6 ppb (25) 6.0 ppb (6) N/A 21.0 ppb (19) N/A N/A 38.0 ppb (29) 0.18 ppb (2) N/A N/A 29.0
 
March 20, 2019, 2 p.m. 27.1 ppb (25) 6.5 ppb (6) N/A 21.0 ppb (19) N/A N/A 34.0 ppb (26) 0.2 ppb (2) N/A N/A 26.0
 
March 20, 2019, 1 p.m. 25.6 ppb (24) 5.8 ppb (5) N/A 20.0 ppb (19) N/A N/A 34.0 ppb (26) 0.18 ppb (2) N/A N/A 26.0
 
March 20, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
March 20, 2019, 11 a.m. 27.6 ppb (26) 5.5 ppb (5) N/A 22.0 ppb (20) N/A N/A 44.0 ppb (34) 0.13 ppb (1) N/A N/A 34.0
 
March 20, 2019, 10 a.m. 29.6 ppb (27) 6.2 ppb (6) N/A 23.0 ppb (21) N/A N/A 44.0 ppb (34) 0.14 ppb (2) N/A N/A 34.0
 
March 20, 2019, 9 a.m. 34.7 ppb (32) 8.9 ppb (8) N/A 26.0 ppb (24) N/A N/A 42.0 ppb (32) 0.15 ppb (2) N/A N/A 32.0
 
March 20, 2019, 8 a.m. 38.2 ppb (35) 12.2 ppb (11) N/A 26.0 ppb (24) N/A N/A 28.0 ppb (22) 0.22 ppb (2) N/A N/A 35.0
 
March 20, 2019, 7 a.m. 38.3 ppb (35) 11.3 ppb (10) N/A 27.0 ppb (25) N/A N/A 19.0 ppb (15) 0.3 ppb (3) N/A N/A 35.0
 
March 20, 2019, 6 a.m. 39.1 ppb (36) 10.9 ppb (10) N/A 28.0 ppb (26) N/A N/A 24.0 ppb (18) 0.29 ppb (3) N/A N/A 36.0
 
March 20, 2019, 5 a.m. 38.9 ppb (36) 10.3 ppb (10) N/A 29.0 ppb (27) N/A N/A 30.0 ppb (23) 0.24 ppb (3) N/A N/A 36.0
 
March 20, 2019, 4 a.m. 39.9 ppb (37) 10.2 ppb (9) N/A 30.0 ppb (28) N/A N/A 32.0 ppb (25) 0.24 ppb (3) N/A N/A 37.0
 
March 20, 2019, 3 a.m. 40.2 ppb (37) 9.3 ppb (9) N/A 31.0 ppb (29) N/A N/A 26.0 ppb (20) 0.29 ppb (3) N/A N/A 37.0
 
March 20, 2019, 2 a.m. 39.6 ppb (37) 7.8 ppb (7) N/A 32.0 ppb (30) N/A N/A 33.0 ppb (25) 0.28 ppb (3) N/A N/A 37.0
 
March 20, 2019, 1 a.m. 39.4 ppb (36) 7.3 ppb (7) N/A 32.0 ppb (30) N/A N/A 42.0 ppb (32) 0.25 ppb (3) N/A N/A 36.0
 
March 20, 2019, midnight 39.0 ppb (36) 6.9 ppb (6) N/A 32.0 ppb (30) N/A N/A 41.0 ppb (32) 0.26 ppb (3) N/A N/A 36.0
 
March 19, 2019, 11 p.m. 38.0 ppb (35) 6.7 ppb (6) N/A 31.0 ppb (29) N/A N/A 42.0 ppb (32) 0.22 ppb (2) N/A N/A 35.0
 
March 19, 2019, 10 p.m. 36.3 ppb (34) 5.4 ppb (5) N/A 31.0 ppb (29) N/A N/A 42.0 ppb (32) 0.23 ppb (3) N/A N/A 34.0
 
March 19, 2019, 9 p.m. 35.2 ppb (33) 5.8 ppb (5) N/A 29.0 ppb (27) N/A N/A 42.0 ppb (32) 0.2 ppb (2) N/A N/A 33.0
 
March 19, 2019, 8 p.m. 32.9 ppb (30) 5.1 ppb (5) N/A 28.0 ppb (26) N/A N/A 39.0 ppb (30) 0.19 ppb (2) N/A N/A 30.0
 
March 19, 2019, 7 p.m. 33.2 ppb (31) 9.6 ppb (9) N/A 24.0 ppb (22) N/A N/A 37.0 ppb (28) 0.19 ppb (2) N/A N/A 31.0
 
March 19, 2019, 6 p.m. 36.7 ppb (34) 13.6 ppb (13) N/A 23.0 ppb (21) N/A N/A 29.0 ppb (22) 0.23 ppb (3) N/A N/A 34.0
 
March 19, 2019, 5 p.m. 37.4 ppb (35) 15.2 ppb (14) N/A 22.0 ppb (20) N/A N/A 26.0 ppb (20) 0.23 ppb (3) N/A N/A 35.0
 
March 19, 2019, 4 p.m. 35.6 ppb (33) 15.0 ppb (14) N/A 21.0 ppb (19) N/A N/A 14.0 ppb (11) 0.33 ppb (4) N/A N/A 33.0
 
March 19, 2019, 3 p.m. 35.1 ppb (32) 14.2 ppb (13) N/A 21.0 ppb (19) N/A N/A 8.0 ppb (6) 0.42 ppb (5) N/A N/A 32.0
 
March 19, 2019, 2 p.m. 32.6 ppb (30) 12.4 ppb (11) N/A 20.0 ppb (19) N/A N/A 5.0 ppb (4) 0.34 ppb (4) N/A N/A 30.0
 
March 19, 2019, 1 p.m. 31.8 ppb (29) 11.8 ppb (11) N/A 20.0 ppb (19) N/A N/A 8.0 ppb (6) 0.29 ppb (3) N/A N/A 29.0
 
March 19, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
March 19, 2019, 11 a.m. 32.8 ppb (30) 10.8 ppb (10) N/A 22.0 ppb (20) N/A N/A 17.0 ppb (13) 0.17 ppb (2) N/A N/A 30.0
 
March 19, 2019, 10 a.m. 33.2 ppb (31) 10.9 ppb (10) N/A 22.0 ppb (20) N/A N/A 21.0 ppb (16) 0.16 ppb (2) N/A N/A 31.0
 
March 19, 2019, 9 a.m. 34.6 ppb (32) 11.1 ppb (10) N/A 24.0 ppb (22) N/A N/A 22.0 ppb (17) 0.18 ppb (2) N/A N/A 32.0
 
March 19, 2019, 8 a.m. 35.1 ppb (32) 10.6 ppb (10) N/A 25.0 ppb (23) N/A N/A 20.0 ppb (15) 0.2 ppb (2) N/A N/A 32.0
 
March 19, 2019, 7 a.m. 37.0 ppb (34) 10.8 ppb (10) N/A 26.0 ppb (24) N/A N/A 30.0 ppb (23) 0.14 ppb (2) N/A N/A 34.0
 
March 19, 2019, 6 a.m. 38.0 ppb (35) 10.8 ppb (10) N/A 27.0 ppb (25) N/A N/A 32.0 ppb (25) 0.15 ppb (2) N/A N/A 35.0
 
March 19, 2019, 5 a.m. 40.6 ppb (38) 10.5 ppb (10) N/A 30.0 ppb (28) N/A N/A 30.0 ppb (23) 0.17 ppb (2) N/A N/A 38.0
 
March 19, 2019, 4 a.m. 41.9 ppb (39) 10.3 ppb (10) N/A 32.0 ppb (30) N/A N/A 31.0 ppb (24) 0.19 ppb (2) N/A N/A 39.0
 
March 19, 2019, 3 a.m. 43.6 ppb (40) 9.7 ppb (9) N/A 34.0 ppb (31) N/A N/A 35.0 ppb (27) 0.2 ppb (2) N/A N/A 40.0
 
March 19, 2019, 2 a.m. 44.4 ppb (41) 8.8 ppb (8) N/A 36.0 ppb (33) N/A N/A 38.0 ppb (29) 0.3 ppb (3) N/A N/A 41.0
 
March 19, 2019, 1 a.m. 44.1 ppb (41) 8.8 ppb (8) N/A 35.0 ppb (32) N/A N/A 48.0 ppb (37) 0.21 ppb (2) N/A N/A 41.0
 
March 19, 2019, midnight 43.2 ppb (40) 8.5 ppb (8) N/A 35.0 ppb (32) N/A N/A 54.0 ppb (42) 0.19 ppb (2) N/A N/A 42.0
 
March 18, 2019, 11 p.m. 41.8 ppb (39) 8.7 ppb (8) N/A 33.0 ppb (31) N/A N/A 55.0 ppb (42) 0.19 ppb (2) N/A N/A 42.0
 
March 18, 2019, 10 p.m. 41.2 ppb (38) 10.0 ppb (9) N/A 31.0 ppb (29) N/A N/A 52.0 ppb (40) 0.2 ppb (2) N/A N/A 40.0
 
March 18, 2019, 9 p.m. 39.0 ppb (36) 10.0 ppb (9) N/A 29.0 ppb (27) N/A N/A 51.0 ppb (39) 0.2 ppb (2) N/A N/A 39.0