AQSQID: 060070008

Site Name: Chico - East

Location: Chico, CA

Reporting: True, Located: True

Current AQI: 17.0

Chico CA, US: 39.76161, -121.84048

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
May 20, 2019, 7 a.m. 2.7 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A 22.0 ppb (17) 0.16 ppb (2) 6.0 μg/m3 (5) 3.0 μg/m3 (12) 17.0
 
May 20, 2019, 6 a.m. 3.2 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) 0.18 ppb (2) 6.0 μg/m3 (5) 3.0 μg/m3 (12) 20.0
 
May 20, 2019, 5 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 35.0 ppb (27) 0.15 ppb (2) 6.0 μg/m3 (5) 0.0 μg/m3 (0) 27.0
 
May 20, 2019, 4 a.m. 5.1 ppb (5) 0.2 ppb (0) N/A 5.0 ppb (5) N/A N/A 37.0 ppb (28) 0.18 ppb (2) 7.0 μg/m3 (6) N/A 28.0
 
May 20, 2019, 3 a.m. 4.4 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A 42.0 ppb (32) 0.17 ppb (2) 7.0 μg/m3 (6) N/A 32.0
 
May 20, 2019, 2 a.m. 1.7 ppb (2) -0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A 50.0 ppb (38) 0.14 ppb (2) 5.0 μg/m3 (5) N/A 38.0
 
May 20, 2019, 1 a.m. 2.4 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A 49.0 ppb (38) 0.14 ppb (2) 6.0 μg/m3 (5) 2.0 μg/m3 (8) 38.0
 
May 20, 2019, midnight 2.9 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A 50.0 ppb (38) 0.15 ppb (2) 3.0 μg/m3 (3) 2.0 μg/m3 (8) 38.0
 
May 19, 2019, 11 p.m. 2.3 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A 51.0 ppb (39) 0.15 ppb (2) 3.0 μg/m3 (3) 2.0 μg/m3 (8) 39.0
 
May 19, 2019, 10 p.m. 2.7 ppb (3) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A 51.0 ppb (39) 0.14 ppb (2) 4.0 μg/m3 (4) -1.0 μg/m3 (0) 39.0
 
May 19, 2019, 9 p.m. 1.9 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A 52.0 ppb (40) 0.14 ppb (2) 5.0 μg/m3 (5) 0.0 μg/m3 (0) 40.0
 
May 19, 2019, 8 p.m. 2.0 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A 50.0 ppb (38) 0.14 ppb (2) 4.0 μg/m3 (4) 0.0 μg/m3 (0) 38.0
 
May 19, 2019, 7 p.m. 3.4 ppb (3) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A 46.0 ppb (35) 0.16 ppb (2) 5.0 μg/m3 (5) 2.0 μg/m3 (8) 35.0
 
May 19, 2019, 6 p.m. 2.7 ppb (3) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A 45.0 ppb (35) 0.15 ppb (2) 4.0 μg/m3 (4) 3.0 μg/m3 (12) 35.0
 
May 19, 2019, 5 p.m. 2.7 ppb (3) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A 43.0 ppb (33) 0.15 ppb (2) 6.0 μg/m3 (5) 4.0 μg/m3 (17) 33.0
 
May 19, 2019, 4 p.m. 3.5 ppb (3) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A 38.0 ppb (29) 0.15 ppb (2) 10.0 μg/m3 (9) 4.0 μg/m3 (17) 29.0
 
May 19, 2019, 3 p.m. 2.8 ppb (3) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A 36.0 ppb (28) 0.15 ppb (2) 16.0 μg/m3 (15) 2.0 μg/m3 (8) 28.0
 
May 19, 2019, 2 p.m. 1.5 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A 36.0 ppb (28) 0.14 ppb (2) 6.0 μg/m3 (5) 0.0 μg/m3 (0) 28.0
 
May 19, 2019, 1 p.m. 1.4 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A 36.0 ppb (28) 0.13 ppb (1) 3.0 μg/m3 (3) 2.0 μg/m3 (8) 28.0
 
May 19, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A 2.0 μg/m3 (2) 3.0 μg/m3 (12) 12.0
 
May 19, 2019, 11 a.m. 1.5 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A 37.0 ppb (28) 0.13 ppb (1) 2.0 μg/m3 (2) 2.0 μg/m3 (8) 28.0
 
May 19, 2019, 10 a.m. 1.2 ppb (1) -0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A 38.0 ppb (29) 0.14 ppb (2) 2.0 μg/m3 (2) 2.0 μg/m3 (8) 29.0
 
May 19, 2019, 9 a.m. 0.8 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A 44.0 ppb (34) 0.13 ppb (1) 1.0 μg/m3 (1) -1.0 μg/m3 (0) 34.0
 
May 19, 2019, 8 a.m. 0.7 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A 47.0 ppb (36) 0.14 ppb (2) 2.0 μg/m3 (2) 0.0 μg/m3 (0) 36.0
 
May 19, 2019, 7 a.m. 1.2 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A 40.0 ppb (31) 0.14 ppb (2) 3.0 μg/m3 (3) 0.0 μg/m3 (0) 31.0
 
May 19, 2019, 6 a.m. 1.6 ppb (1) -0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 38.0 ppb (29) 0.15 ppb (2) 1.0 μg/m3 (1) 0.0 μg/m3 (0) 29.0
 
May 19, 2019, 5 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 37.0 ppb (28) 0.16 ppb (2) 1.0 μg/m3 (1) 1.0 μg/m3 (4) 28.0
 
May 19, 2019, 4 a.m. 2.2 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 36.0 ppb (28) 0.17 ppb (2) 3.0 μg/m3 (3) 1.0 μg/m3 (4) 28.0
 
May 19, 2019, 3 a.m. 2.8 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A 34.0 ppb (26) 0.17 ppb (2) 5.0 μg/m3 (5) -1.0 μg/m3 (0) 26.0
 
May 19, 2019, 2 a.m. 6.3 ppb (6) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A 31.0 ppb (24) 0.18 ppb (2) 7.0 μg/m3 (6) 2.0 μg/m3 (8) 24.0
 
May 19, 2019, 1 a.m. 4.5 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A 35.0 ppb (27) 0.19 ppb (2) 9.0 μg/m3 (8) 2.0 μg/m3 (8) 27.0
 
May 19, 2019, midnight 2.8 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A 40.0 ppb (31) 0.16 ppb (2) 7.0 μg/m3 (6) 0.0 μg/m3 (0) 31.0
 
May 18, 2019, 11 p.m. 2.4 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 41.0 ppb (32) 0.16 ppb (2) 6.0 μg/m3 (5) 2.0 μg/m3 (8) 32.0
 
May 18, 2019, 10 p.m. 3.4 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 42.0 ppb (32) 0.16 ppb (2) 10.0 μg/m3 (9) 5.0 μg/m3 (21) 32.0
 
May 18, 2019, 9 p.m. 4.9 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 28.0 ppb (22) 0.17 ppb (2) 14.0 μg/m3 (13) 5.0 μg/m3 (21) 22.0
 
May 18, 2019, 8 p.m. 4.3 ppb (4) 0.8 ppb (1) N/A 4.0 ppb (4) N/A N/A 34.0 ppb (26) 0.17 ppb (2) 10.0 μg/m3 (9) 2.0 μg/m3 (8) 26.0
 
May 18, 2019, 7 p.m. 4.5 ppb (4) 0.9 ppb (1) N/A 4.0 ppb (4) N/A N/A 30.0 ppb (23) 0.18 ppb (2) 12.0 μg/m3 (11) 5.0 μg/m3 (21) 23.0
 
May 18, 2019, 6 p.m. 3.8 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 27.0 ppb (21) 0.2 ppb (2) 12.0 μg/m3 (11) 8.0 μg/m3 (33) 33.0
 
May 18, 2019, 5 p.m. 4.3 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A N/A 20.0 ppb (15) 0.18 ppb (2) 10.0 μg/m3 (9) 2.0 μg/m3 (8) 15.0
 
May 18, 2019, 4 p.m. 4.6 ppb (4) 1.4 ppb (1) N/A 3.0 ppb (3) N/A N/A 16.0 ppb (12) 0.18 ppb (2) 11.0 μg/m3 (10) 3.0 μg/m3 (12) 12.0
 
May 18, 2019, 3 p.m. 4.5 ppb (4) 1.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 14.0 ppb (11) 0.18 ppb (2) 10.0 μg/m3 (9) 5.0 μg/m3 (21) 21.0
 
May 18, 2019, 2 p.m. 5.9 ppb (5) 1.7 ppb (2) N/A 4.0 ppb (4) N/A N/A 11.0 ppb (8) 0.17 ppb (2) 10.0 μg/m3 (9) 4.0 μg/m3 (17) 17.0
 
May 18, 2019, 1 p.m. 3.9 ppb (4) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 12.0 ppb (9) 0.13 ppb (1) 4.0 μg/m3 (4) 3.0 μg/m3 (12) 12.0
 
May 18, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A 3.0 μg/m3 (3) 2.0 μg/m3 (8) 8.0
 
May 18, 2019, 11 a.m. 2.1 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 17.0 ppb (13) 0.12 ppb (1) 5.0 μg/m3 (5) 1.0 μg/m3 (4) 13.0
 
May 18, 2019, 10 a.m. 2.3 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 18.0 ppb (14) 0.13 ppb (1) 6.0 μg/m3 (5) 0.0 μg/m3 (0) 14.0
 
May 18, 2019, 9 a.m. 1.4 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A 22.0 ppb (17) 0.12 ppb (1) 8.0 μg/m3 (7) 1.0 μg/m3 (4) 17.0
 
May 18, 2019, 8 a.m. 1.7 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A 22.0 ppb (17) 0.13 ppb (1) 4.0 μg/m3 (4) 4.0 μg/m3 (17) 17.0
 
May 18, 2019, 7 a.m. 2.3 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 23.0 ppb (18) 0.15 ppb (2) 5.0 μg/m3 (5) 4.0 μg/m3 (17) 18.0
 
May 18, 2019, 6 a.m. 2.1 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 27.0 ppb (21) 0.14 ppb (2) 9.0 μg/m3 (8) 3.0 μg/m3 (12) 21.0
 
May 18, 2019, 5 a.m. 2.3 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 31.0 ppb (24) 0.15 ppb (2) 12.0 μg/m3 (11) 4.0 μg/m3 (17) 24.0
 
May 18, 2019, 4 a.m. 4.9 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A N/A 33.0 ppb (25) 0.18 ppb (2) 7.0 μg/m3 (6) 6.0 μg/m3 (25) 25.0
 
May 18, 2019, 3 a.m. 7.2 ppb (7) 0.5 ppb (0) N/A 7.0 ppb (6) N/A N/A 34.0 ppb (26) 0.2 ppb (2) 12.0 μg/m3 (11) N/A 26.0
 
May 18, 2019, 2 a.m. 4.5 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A 40.0 ppb (31) 0.17 ppb (2) 7.0 μg/m3 (6) 2.0 μg/m3 (8) 31.0
 
May 18, 2019, 1 a.m. 2.8 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A 43.0 ppb (33) 0.15 ppb (2) 3.0 μg/m3 (3) 2.0 μg/m3 (8) 33.0
 
May 18, 2019, midnight 3.0 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A 42.0 ppb (32) 0.15 ppb (2) 6.0 μg/m3 (5) 2.0 μg/m3 (8) 32.0
 
May 17, 2019, 11 p.m. 3.5 ppb (3) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A 42.0 ppb (32) 0.15 ppb (2) 6.0 μg/m3 (5) 1.0 μg/m3 (4) 32.0
 
May 17, 2019, 10 p.m. 2.7 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A 41.0 ppb (32) 0.14 ppb (2) 7.0 μg/m3 (6) 2.0 μg/m3 (8) 32.0
 
May 17, 2019, 9 p.m. 3.0 ppb (3) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A 40.0 ppb (31) 0.14 ppb (2) 10.0 μg/m3 (9) 1.0 μg/m3 (4) 31.0
 
May 17, 2019, 8 p.m. 2.1 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A 40.0 ppb (31) 0.13 ppb (1) 9.0 μg/m3 (8) 0.0 μg/m3 (0) 31.0
 
May 17, 2019, 7 p.m. 3.1 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A 39.0 ppb (30) 0.15 ppb (2) 15.0 μg/m3 (14) 0.0 μg/m3 (0) 30.0
 
May 17, 2019, 6 p.m. 2.7 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A 37.0 ppb (28) 0.14 ppb (2) 9.0 μg/m3 (8) 2.0 μg/m3 (8) 28.0
 
May 17, 2019, 5 p.m. 3.2 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A 35.0 ppb (27) 0.15 ppb (2) 10.0 μg/m3 (9) 4.0 μg/m3 (17) 27.0
 
May 17, 2019, 4 p.m. 2.7 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A 34.0 ppb (26) 0.14 ppb (2) 13.0 μg/m3 (12) 4.0 μg/m3 (17) 26.0
 
May 17, 2019, 3 p.m. 3.8 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 32.0 ppb (25) 0.15 ppb (2) 14.0 μg/m3 (13) 4.0 μg/m3 (17) 25.0
 
May 17, 2019, 2 p.m. 3.7 ppb (3) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A 31.0 ppb (24) 0.15 ppb (2) 7.0 μg/m3 (6) 2.0 μg/m3 (8) 24.0
 
May 17, 2019, 1 p.m. 2.5 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 31.0 ppb (24) 0.13 ppb (1) 7.0 μg/m3 (6) 2.0 μg/m3 (8) 24.0
 
May 17, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A 9.0 μg/m3 (8) 3.0 μg/m3 (12) 12.0
 
May 17, 2019, 11 a.m. 1.2 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A 32.0 ppb (25) 0.12 ppb (1) 7.0 μg/m3 (6) 2.0 μg/m3 (8) 25.0
 
May 17, 2019, 10 a.m. 1.3 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A 32.0 ppb (25) 0.13 ppb (1) 7.0 μg/m3 (6) N/A 25.0
 
May 17, 2019, 9 a.m. 1.3 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A 32.0 ppb (25) 0.13 ppb (1) 4.0 μg/m3 (4) N/A 25.0
 
May 17, 2019, 8 a.m. 1.2 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A 33.0 ppb (25) 0.13 ppb (1) 5.0 μg/m3 (5) N/A 25.0
 
May 17, 2019, 7 a.m. 1.5 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A 33.0 ppb (25) 0.13 ppb (1) 5.0 μg/m3 (5) 1.0 μg/m3 (4) 25.0
 
May 17, 2019, 6 a.m. 1.5 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A 34.0 ppb (26) 0.13 ppb (1) 5.0 μg/m3 (5) 1.0 μg/m3 (4) 26.0
 
May 17, 2019, 5 a.m. 1.3 ppb (1) -0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A 35.0 ppb (27) 0.13 ppb (1) 7.0 μg/m3 (6) 1.0 μg/m3 (4) 27.0
 
May 17, 2019, 4 a.m. 1.7 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 36.0 ppb (28) 0.13 ppb (1) 6.0 μg/m3 (5) 0.0 μg/m3 (0) 28.0
 
May 17, 2019, 3 a.m. 2.2 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A 36.0 ppb (28) 0.14 ppb (2) 8.0 μg/m3 (7) 1.0 μg/m3 (4) 28.0
 
May 17, 2019, 2 a.m. 2.7 ppb (3) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A 35.0 ppb (27) 0.14 ppb (2) 6.0 μg/m3 (5) 2.0 μg/m3 (8) 27.0
 
May 17, 2019, 1 a.m. 2.9 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A 35.0 ppb (27) 0.15 ppb (2) 7.0 μg/m3 (6) 0.0 μg/m3 (0) 27.0
 
May 17, 2019, midnight 3.3 ppb (3) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 37.0 ppb (28) 0.15 ppb (2) 5.0 μg/m3 (5) 0.0 μg/m3 (0) 28.0
 
May 16, 2019, 11 p.m. 3.4 ppb (3) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A 39.0 ppb (30) 0.15 ppb (2) 5.0 μg/m3 (5) -1.0 μg/m3 (0) 30.0
 
May 16, 2019, 10 p.m. 3.8 ppb (4) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A 38.0 ppb (29) 0.14 ppb (2) 7.0 μg/m3 (6) -2.0 μg/m3 (0) 29.0
 
May 16, 2019, 9 p.m. 3.9 ppb (4) 1.1 ppb (1) N/A 3.0 ppb (3) N/A N/A 40.0 ppb (31) 0.15 ppb (2) 6.0 μg/m3 (5) 1.0 μg/m3 (4) 31.0
 
May 16, 2019, 8 p.m. 3.1 ppb (3) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A 42.0 ppb (32) 0.14 ppb (2) 9.0 μg/m3 (8) 4.0 μg/m3 (17) 32.0
 
May 16, 2019, 7 p.m. 3.6 ppb (3) 1.1 ppb (1) N/A 3.0 ppb (3) N/A N/A 43.0 ppb (33) 0.14 ppb (2) 10.0 μg/m3 (9) 4.0 μg/m3 (17) 33.0
 
May 16, 2019, 6 p.m. 4.0 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 42.0 ppb (32) 0.15 ppb (2) 13.0 μg/m3 (12) 3.0 μg/m3 (12) 32.0
 
May 16, 2019, 5 p.m. 3.6 ppb (3) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 41.0 ppb (32) 0.14 ppb (2) 17.0 μg/m3 (15) 4.0 μg/m3 (17) 32.0
 
May 16, 2019, 4 p.m. 2.7 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A 41.0 ppb (32) 0.14 ppb (2) 16.0 μg/m3 (15) 3.0 μg/m3 (12) 32.0
 
May 16, 2019, 3 p.m. 4.0 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A N/A 38.0 ppb (29) 0.15 ppb (2) 10.0 μg/m3 (9) 2.0 μg/m3 (8) 29.0
 
May 16, 2019, 2 p.m. 4.7 ppb (4) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A 37.0 ppb (28) 0.16 ppb (2) 9.0 μg/m3 (8) 0.0 μg/m3 (0) 28.0
 
May 16, 2019, 1 p.m. 2.2 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A 38.0 ppb (29) 0.12 ppb (1) 5.0 μg/m3 (5) 2.0 μg/m3 (8) 29.0
 
May 16, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A 5.0 μg/m3 (5) 2.0 μg/m3 (8) 8.0
 
May 16, 2019, 11 a.m. 1.1 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A 36.0 ppb (28) 0.11 ppb (1) 2.0 μg/m3 (2) 1.0 μg/m3 (4) 28.0
 
May 16, 2019, 10 a.m. 1.3 ppb (1) -0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A 38.0 ppb (29) 0.1 ppb (1) 2.0 μg/m3 (2) 1.0 μg/m3 (4) 29.0
 
May 16, 2019, 9 a.m. 1.6 ppb (1) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 30.0 ppb (23) 0.09 ppb (1) 0.0 μg/m3 (0) 1.0 μg/m3 (4) 23.0
 
May 16, 2019, 8 a.m. 1.5 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A 31.0 ppb (24) 0.11 ppb (1) 4.0 μg/m3 (4) 2.0 μg/m3 (8) 24.0
 
May 16, 2019, 7 a.m. 1.3 ppb (1) -0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 32.0 ppb (25) 0.13 ppb (1) 8.0 μg/m3 (7) 4.0 μg/m3 (17) 25.0
 
May 16, 2019, 6 a.m. 1.5 ppb (1) -0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A 33.0 ppb (25) 0.14 ppb (2) 6.0 μg/m3 (5) 4.0 μg/m3 (17) 25.0
 
May 16, 2019, 5 a.m. 1.8 ppb (2) -0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 31.0 ppb (24) 0.14 ppb (2) 8.0 μg/m3 (7) 4.0 μg/m3 (17) 24.0
 
May 16, 2019, 4 a.m. 3.2 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A 28.0 ppb (22) 0.14 ppb (2) 9.0 μg/m3 (8) 5.0 μg/m3 (21) 22.0
 
May 16, 2019, 3 a.m. 3.7 ppb (3) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A 28.0 ppb (22) 0.14 ppb (2) 14.0 μg/m3 (13) 2.0 μg/m3 (8) 22.0
 
May 16, 2019, 2 a.m. 4.1 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A 27.0 ppb (21) 0.15 ppb (2) 6.0 μg/m3 (5) 2.0 μg/m3 (8) 21.0
 
May 16, 2019, 1 a.m. 5.4 ppb (5) 0.9 ppb (1) N/A 5.0 ppb (5) N/A N/A 28.0 ppb (22) 0.16 ppb (2) 8.0 μg/m3 (7) 2.0 μg/m3 (8) 22.0
 
May 16, 2019, midnight 5.5 ppb (5) 0.8 ppb (1) N/A 5.0 ppb (5) N/A N/A 30.0 ppb (23) 0.15 ppb (2) 11.0 μg/m3 (10) 3.0 μg/m3 (12) 23.0
 
May 15, 2019, 11 p.m. 4.2 ppb (4) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A 29.0 ppb (22) 0.14 ppb (2) 17.0 μg/m3 (15) 4.0 μg/m3 (17) 22.0
 
May 15, 2019, 10 p.m. 3.8 ppb (4) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) 0.14 ppb (2) 3.0 μg/m3 (3) 4.0 μg/m3 (17) 20.0
 
May 15, 2019, 9 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 29.0 ppb (22) 0.14 ppb (2) 6.0 μg/m3 (5) 6.0 μg/m3 (25) 25.0
 
May 15, 2019, 8 p.m. 3.1 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A 28.0 ppb (22) 0.13 ppb (1) 7.0 μg/m3 (6) 2.0 μg/m3 (8) 22.0
 
May 15, 2019, 7 p.m. 3.8 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 24.0 ppb (18) 0.14 ppb (2) 7.0 μg/m3 (6) 0.0 μg/m3 (0) 18.0
 
May 15, 2019, 6 p.m. 4.5 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A 21.0 ppb (16) 0.14 ppb (2) 11.0 μg/m3 (10) 2.0 μg/m3 (8) 16.0
 
May 15, 2019, 5 p.m. 5.4 ppb (5) 1.2 ppb (1) N/A 4.0 ppb (4) N/A N/A 22.0 ppb (17) 0.14 ppb (2) 10.0 μg/m3 (9) 4.0 μg/m3 (17) 17.0
 
May 15, 2019, 4 p.m. 8.2 ppb (8) 1.8 ppb (2) N/A 6.0 ppb (6) N/A N/A 21.0 ppb (16) 0.15 ppb (2) 13.0 μg/m3 (12) 5.0 μg/m3 (21) 21.0
 
May 15, 2019, 3 p.m. 10.1 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A N/A 18.0 ppb (14) 0.19 ppb (2) 8.0 μg/m3 (7) 3.0 μg/m3 (12) 14.0
 
May 15, 2019, 2 p.m. 6.6 ppb (6) 1.1 ppb (1) N/A 6.0 ppb (6) N/A N/A 20.0 ppb (15) 0.16 ppb (2) 16.0 μg/m3 (15) 3.0 μg/m3 (12) 15.0
 
May 15, 2019, 1 p.m. 3.8 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A 23.0 ppb (18) 0.13 ppb (1) 22.0 μg/m3 (20) 3.0 μg/m3 (12) 20.0
 
May 15, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A 21.0 μg/m3 (19) 1.0 μg/m3 (4) 19.0
 
May 15, 2019, 11 a.m. 2.6 ppb (2) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) 0.13 ppb (1) 14.0 μg/m3 (13) 1.0 μg/m3 (4) 20.0
 
May 15, 2019, 10 a.m. 2.3 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 26.0 ppb (20) 0.13 ppb (1) 14.0 μg/m3 (13) 5.0 μg/m3 (21) 21.0
 
May 15, 2019, 9 a.m. 3.0 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A 24.0 ppb (18) 0.14 ppb (2) 16.0 μg/m3 (15) 6.0 μg/m3 (25) 25.0
 
May 15, 2019, 8 a.m. 3.6 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A 24.0 ppb (18) 0.14 ppb (2) 27.0 μg/m3 (25) 3.0 μg/m3 (12) 25.0
 
May 15, 2019, 7 a.m. 5.0 ppb (5) 0.3 ppb (0) N/A 5.0 ppb (5) N/A N/A 24.0 ppb (18) 0.16 ppb (2) 35.0 μg/m3 (32) 6.0 μg/m3 (25) 32.0
 
May 15, 2019, 6 a.m. 4.9 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A N/A 28.0 ppb (22) 0.16 ppb (2) 52.0 μg/m3 (47) 7.0 μg/m3 (29) 47.0
 
May 15, 2019, 5 a.m. 5.9 ppb (5) 0.0 ppb (0) N/A 6.0 ppb (6) N/A N/A 31.0 ppb (24) 0.17 ppb (2) 62.0 μg/m3 (54) 3.0 μg/m3 (12) 54.0
 
May 15, 2019, 4 a.m. 6.1 ppb (6) 0.3 ppb (0) N/A 6.0 ppb (6) N/A N/A 35.0 ppb (27) 0.17 ppb (2) 47.0 μg/m3 (43) 6.0 μg/m3 (25) 43.0
 
May 15, 2019, 3 a.m. 6.8 ppb (6) 0.4 ppb (0) N/A 6.0 ppb (6) N/A N/A 37.0 ppb (28) 0.17 ppb (2) 71.0 μg/m3 (58) 5.0 μg/m3 (21) 58.0
 
May 15, 2019, 2 a.m. 8.5 ppb (8) 0.4 ppb (0) N/A 8.0 ppb (7) N/A N/A 36.0 ppb (28) 0.2 ppb (2) 47.0 μg/m3 (43) 5.0 μg/m3 (21) 43.0
 
May 15, 2019, 1 a.m. 6.9 ppb (6) 0.7 ppb (1) N/A 6.0 ppb (6) N/A N/A 41.0 ppb (32) 0.18 ppb (2) 41.0 μg/m3 (37) 1.0 μg/m3 (4) 37.0
 
May 15, 2019, midnight 5.7 ppb (5) 0.4 ppb (0) N/A 5.0 ppb (5) N/A N/A 44.0 ppb (34) 0.17 ppb (2) 50.0 μg/m3 (45) 4.0 μg/m3 (17) 45.0
 
May 14, 2019, 11 p.m. 5.5 ppb (5) 0.5 ppb (0) N/A 5.0 ppb (5) N/A N/A 44.0 ppb (34) 0.17 ppb (2) 71.0 μg/m3 (58) 6.0 μg/m3 (25) 58.0
 
May 14, 2019, 10 p.m. 4.6 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A 43.0 ppb (33) 0.15 ppb (2) 65.0 μg/m3 (55) 7.0 μg/m3 (29) 55.0
 
May 14, 2019, 9 p.m. 5.2 ppb (5) 0.9 ppb (1) N/A 4.0 ppb (4) N/A N/A 41.0 ppb (32) 0.17 ppb (2) 76.0 μg/m3 (60) N/A 60.0
 
May 14, 2019, 8 p.m. 4.6 ppb (4) 0.8 ppb (1) N/A 4.0 ppb (4) N/A N/A 39.0 ppb (30) 0.15 ppb (2) 87.0 μg/m3 (66) 4.0 μg/m3 (17) 66.0
 
May 14, 2019, 7 p.m. 4.5 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 38.0 ppb (29) 0.15 ppb (2) 72.0 μg/m3 (58) 4.0 μg/m3 (17) 58.0
 
May 14, 2019, 6 p.m. 4.5 ppb (4) 1.1 ppb (1) N/A 3.0 ppb (3) N/A N/A 37.0 ppb (28) 0.15 ppb (2) 61.0 μg/m3 (53) 4.0 μg/m3 (17) 53.0
 
May 14, 2019, 5 p.m. 4.4 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 34.0 ppb (26) 0.14 ppb (2) 56.0 μg/m3 (50) 6.0 μg/m3 (25) 50.0
 
May 14, 2019, 4 p.m. 5.5 ppb (5) 1.3 ppb (1) N/A 4.0 ppb (4) N/A N/A 30.0 ppb (23) 0.14 ppb (2) 42.0 μg/m3 (38) 4.0 μg/m3 (17) 38.0
 
May 14, 2019, 3 p.m. 6.2 ppb (6) 1.3 ppb (1) N/A 5.0 ppb (5) N/A N/A 27.0 ppb (21) 0.16 ppb (2) 23.0 μg/m3 (21) 3.0 μg/m3 (12) 21.0
 
May 14, 2019, 2 p.m. 7.1 ppb (7) 1.2 ppb (1) N/A 6.0 ppb (6) N/A N/A 26.0 ppb (20) 0.21 ppb (2) 28.0 μg/m3 (25) 1.0 μg/m3 (4) 25.0
 
May 14, 2019, 1 p.m. 5.4 ppb (5) 0.7 ppb (1) N/A 5.0 ppb (5) N/A N/A 29.0 ppb (22) 0.13 ppb (1) 17.0 μg/m3 (15) 1.0 μg/m3 (4) 22.0
 
May 14, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A 25.0 μg/m3 (23) 1.0 μg/m3 (4) 23.0
 
May 14, 2019, 11 a.m. 2.1 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 34.0 ppb (26) 0.12 ppb (1) 20.0 μg/m3 (18) 2.0 μg/m3 (8) 26.0
 
May 14, 2019, 10 a.m. 2.3 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 36.0 ppb (28) 0.13 ppb (1) 20.0 μg/m3 (18) 3.0 μg/m3 (12) 28.0
 
May 14, 2019, 9 a.m. 2.2 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 36.0 ppb (28) 0.13 ppb (1) 25.0 μg/m3 (23) 5.0 μg/m3 (21) 28.0
 
May 14, 2019, 8 a.m. 2.4 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 39.0 ppb (30) 0.14 ppb (2) 21.0 μg/m3 (19) 3.0 μg/m3 (12) 30.0
 
May 14, 2019, 7 a.m. 2.4 ppb (2) -0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A 41.0 ppb (32) 0.14 ppb (2) 22.0 μg/m3 (20) 4.0 μg/m3 (17) 32.0
 
May 14, 2019, 6 a.m. 2.6 ppb (2) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A 40.0 ppb (31) 0.14 ppb (2) 34.0 μg/m3 (31) 5.0 μg/m3 (21) 31.0
 
May 14, 2019, 5 a.m. 2.5 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 43.0 ppb (33) 0.14 ppb (2) 51.0 μg/m3 (46) 5.0 μg/m3 (21) 46.0
 
May 14, 2019, 4 a.m. 2.7 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A 45.0 ppb (35) 0.14 ppb (2) 40.0 μg/m3 (36) 5.0 μg/m3 (21) 36.0
 
May 14, 2019, 3 a.m. 4.7 ppb (4) 0.1 ppb (0) N/A 5.0 ppb (5) N/A N/A 42.0 ppb (32) 0.15 ppb (2) 39.0 μg/m3 (35) 3.0 μg/m3 (12) 35.0
 
May 14, 2019, 2 a.m. 4.8 ppb (4) 0.1 ppb (0) N/A 5.0 ppb (5) N/A N/A 43.0 ppb (33) 0.17 ppb (2) 42.0 μg/m3 (38) 5.0 μg/m3 (21) 38.0
 
May 14, 2019, 1 a.m. 3.5 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A 48.0 ppb (37) 0.15 ppb (2) 44.0 μg/m3 (40) 4.0 μg/m3 (17) 40.0
 
May 14, 2019, midnight 4.1 ppb (4) 0.8 ppb (1) N/A 3.0 ppb (3) N/A N/A 47.0 ppb (36) 0.15 ppb (2) 48.0 μg/m3 (44) 3.0 μg/m3 (12) 44.0
 
May 13, 2019, 11 p.m. 4.0 ppb (4) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 50.0 ppb (38) 0.16 ppb (2) 49.0 μg/m3 (45) 4.0 μg/m3 (17) 45.0
 
May 13, 2019, 10 p.m. 4.3 ppb (4) 0.5 ppb (0) N/A 4.0 ppb (4) N/A N/A 49.0 ppb (38) 0.17 ppb (2) 64.0 μg/m3 (54) 6.0 μg/m3 (25) 54.0
 
May 13, 2019, 9 p.m. 3.9 ppb (4) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A 45.0 ppb (35) 0.16 ppb (2) 57.0 μg/m3 (51) 6.0 μg/m3 (25) 51.0
 
May 13, 2019, 8 p.m. 4.0 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A 41.0 ppb (32) 0.15 ppb (2) 66.0 μg/m3 (56) 5.0 μg/m3 (21) 56.0
 
May 13, 2019, 7 p.m. 4.1 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 38.0 ppb (29) 0.14 ppb (2) 52.0 μg/m3 (47) 6.0 μg/m3 (25) 47.0
 
May 13, 2019, 6 p.m. 4.1 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A N/A 35.0 ppb (27) 0.14 ppb (2) 54.0 μg/m3 (49) 4.0 μg/m3 (17) 49.0
 
May 13, 2019, 5 p.m. 5.0 ppb (5) 1.4 ppb (1) N/A 4.0 ppb (4) N/A N/A 32.0 ppb (25) 0.15 ppb (2) 41.0 μg/m3 (37) 6.0 μg/m3 (25) 37.0
 
May 13, 2019, 4 p.m. 5.4 ppb (5) 1.6 ppb (1) N/A 4.0 ppb (4) N/A N/A 30.0 ppb (23) 0.15 ppb (2) 26.0 μg/m3 (24) 5.0 μg/m3 (21) 24.0
 
May 13, 2019, 3 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 26.0 ppb (20) 0.15 ppb (2) 24.0 μg/m3 (22) 4.0 μg/m3 (17) 22.0
 
May 13, 2019, 2 p.m. 6.3 ppb (6) 1.5 ppb (1) N/A 5.0 ppb (5) N/A N/A 25.0 ppb (19) 0.15 ppb (2) 20.0 μg/m3 (18) 5.0 μg/m3 (21) 21.0
 
May 13, 2019, 1 p.m. 8.0 ppb (7) 1.1 ppb (1) N/A 7.0 ppb (6) N/A N/A 21.0 ppb (16) 0.15 ppb (2) 30.0 μg/m3 (27) 6.0 μg/m3 (25) 27.0
 
May 13, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A 21.0 μg/m3 (19) 4.0 μg/m3 (17) 19.0
 
May 13, 2019, 11 a.m. 2.9 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) 0.13 ppb (1) 21.0 μg/m3 (19) 4.0 μg/m3 (17) 20.0
 
May 13, 2019, 10 a.m. 2.8 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) 0.13 ppb (1) 23.0 μg/m3 (21) 4.0 μg/m3 (17) 21.0
 
May 13, 2019, 9 a.m. 2.6 ppb (2) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A 27.0 ppb (21) 0.14 ppb (2) 24.0 μg/m3 (22) 5.0 μg/m3 (21) 22.0
 
May 13, 2019, 8 a.m. 2.8 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A 29.0 ppb (22) 0.16 ppb (2) 24.0 μg/m3 (22) 8.0 μg/m3 (33) 33.0