AQSQID: 500070007

Site Name: Underhill

Location: Chittenden Co, VT

Reporting: True, Located: True

Current AQI: 19.0

Chittenden Co VT, US: 44.528389, -72.868973

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Sept. 16, 2019, 3 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.8 ppb (1) 0.0 ppb (0) 25.0 ppb (19) 0.1 ppb (1) N/A 3.3 μg/m3 (14) 19.0
 
Sept. 16, 2019, 2 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 23.0 ppb (18) 0.11 ppb (1) N/A 3.2 μg/m3 (13) 18.0
 
Sept. 16, 2019, 1 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 22.0 ppb (17) 0.11 ppb (1) N/A 3.0 μg/m3 (12) 17.0
 
Sept. 16, 2019, noon N/A 0.1 ppb (0) 0.7 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 18.0 ppb (14) 0.11 ppb (1) N/A 2.7 μg/m3 (11) 14.0
 
Sept. 16, 2019, 11 a.m. N/A 0.1 ppb (0) 0.7 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 17.0 ppb (13) 0.11 ppb (1) N/A 2.7 μg/m3 (11) 13.0
 
Sept. 16, 2019, 10 a.m. N/A 0.1 ppb (0) 0.7 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 19.0 ppb (15) 0.11 ppb (1) N/A 2.7 μg/m3 (11) 15.0
 
Sept. 16, 2019, 9 a.m. N/A 0.1 ppb (0) 0.7 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 21.0 ppb (16) 0.11 ppb (1) N/A 2.6 μg/m3 (11) 16.0
 
Sept. 16, 2019, 8 a.m. N/A 0.0 ppb (0) 0.6 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 20.0 ppb (15) N/A N/A 2.6 μg/m3 (11) 15.0
 
Sept. 16, 2019, 7 a.m. N/A 0.1 ppb (0) 0.6 ppb (1) N/A 0.5 ppb (0) N/A 21.0 ppb (16) 0.1 ppb (1) N/A 2.7 μg/m3 (11) 16.0
 
Sept. 16, 2019, 6 a.m. N/A 0.0 ppb (0) 0.5 ppb (0) N/A 0.5 ppb (0) 0.0 ppb (0) N/A 0.11 ppb (1) N/A 2.7 μg/m3 (11) 11.0
 
Sept. 16, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 20.0 ppb (15) 0.11 ppb (1) N/A 2.8 μg/m3 (12) 15.0
 
Sept. 16, 2019, 4 a.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 21.0 ppb (16) 0.11 ppb (1) N/A 2.7 μg/m3 (11) 16.0
 
Sept. 16, 2019, 3 a.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 22.0 ppb (17) 0.11 ppb (1) N/A 2.8 μg/m3 (12) 17.0
 
Sept. 16, 2019, 2 a.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 23.0 ppb (18) 0.11 ppb (1) N/A 2.8 μg/m3 (12) 18.0
 
Sept. 16, 2019, 1 a.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.8 ppb (1) 0.0 ppb (0) 23.0 ppb (18) 0.11 ppb (1) N/A 3.0 μg/m3 (12) 18.0
 
Sept. 16, 2019, midnight N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.8 ppb (1) 0.0 ppb (0) 23.0 ppb (18) 0.11 ppb (1) N/A 3.2 μg/m3 (13) 18.0
 
Sept. 15, 2019, 11 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.8 ppb (1) 0.0 ppb (0) 23.0 ppb (18) 0.11 ppb (1) N/A 3.2 μg/m3 (13) 18.0
 
Sept. 15, 2019, 10 p.m. N/A 0.0 ppb (0) 0.9 ppb (1) N/A 0.8 ppb (1) 0.0 ppb (0) 25.0 ppb (19) 0.11 ppb (1) N/A 3.2 μg/m3 (13) 19.0
 
Sept. 15, 2019, 9 p.m. N/A 0.0 ppb (0) 0.9 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 26.0 ppb (20) 0.1 ppb (1) N/A 3.3 μg/m3 (14) 20.0
 
Sept. 15, 2019, 8 p.m. N/A 0.0 ppb (0) 0.9 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 31.0 ppb (24) 0.1 ppb (1) N/A 3.1 μg/m3 (13) 24.0
 
Sept. 15, 2019, 7 p.m. N/A 0.0 ppb (0) 0.9 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 34.0 ppb (26) 0.11 ppb (1) N/A 3.1 μg/m3 (13) 26.0
 
Sept. 15, 2019, 6 p.m. N/A 0.0 ppb (0) 0.9 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 37.0 ppb (28) 0.12 ppb (1) N/A 3.1 μg/m3 (13) 28.0
 
Sept. 15, 2019, 5 p.m. N/A 0.0 ppb (0) 1.0 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 37.0 ppb (28) 0.12 ppb (1) N/A 3.1 μg/m3 (13) 28.0
 
Sept. 15, 2019, 4 p.m. N/A 0.0 ppb (0) 1.0 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 35.0 ppb (27) 0.11 ppb (1) N/A 3.2 μg/m3 (13) 27.0
 
Sept. 15, 2019, 3 p.m. N/A 0.0 ppb (0) 1.0 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 36.0 ppb (28) 0.11 ppb (1) N/A 3.1 μg/m3 (13) 28.0
 
Sept. 15, 2019, 2 p.m. N/A 0.0 ppb (0) 1.0 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 36.0 ppb (28) 0.11 ppb (1) N/A 3.0 μg/m3 (12) 28.0
 
Sept. 15, 2019, 1 p.m. N/A 0.0 ppb (0) 1.0 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 35.0 ppb (27) 0.11 ppb (1) N/A 3.1 μg/m3 (13) 27.0
 
Sept. 15, 2019, noon N/A 0.0 ppb (0) 0.9 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 31.0 ppb (24) 0.11 ppb (1) N/A 3.5 μg/m3 (15) 24.0
 
Sept. 15, 2019, 11 a.m. N/A 0.0 ppb (0) 0.9 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 31.0 ppb (24) 0.1 ppb (1) N/A 3.7 μg/m3 (15) 24.0
 
Sept. 15, 2019, 10 a.m. N/A 0.0 ppb (0) 0.9 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 33.0 ppb (25) 0.1 ppb (1) N/A 3.5 μg/m3 (15) 25.0
 
Sept. 15, 2019, 9 a.m. N/A 0.1 ppb (0) 0.9 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 32.0 ppb (25) 0.1 ppb (1) N/A 3.6 μg/m3 (15) 25.0
 
Sept. 15, 2019, 8 a.m. N/A 0.1 ppb (0) 0.9 ppb (1) N/A 0.8 ppb (1) 0.0 ppb (0) 30.0 ppb (23) N/A N/A 3.8 μg/m3 (16) 23.0
 
Sept. 15, 2019, 7 a.m. N/A 0.1 ppb (0) 0.9 ppb (1) N/A 0.8 ppb (1) N/A 28.0 ppb (22) 0.09 ppb (1) N/A 4.3 μg/m3 (18) 22.0
 
Sept. 15, 2019, 6 a.m. N/A 0.1 ppb (0) 0.9 ppb (1) N/A 0.8 ppb (1) 0.0 ppb (0) N/A 0.1 ppb (1) N/A 4.6 μg/m3 (19) 19.0
 
Sept. 15, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (22) 0.11 ppb (1) N/A 5.2 μg/m3 (22) 22.0
 
Sept. 15, 2019, 4 a.m. N/A 0.0 ppb (0) 1.5 ppb (1) N/A 1.5 ppb (1) 0.0 ppb (0) 23.0 ppb (18) 0.11 ppb (1) N/A 5.3 μg/m3 (22) 22.0
 
Sept. 15, 2019, 3 a.m. N/A 0.0 ppb (0) 1.5 ppb (1) N/A 1.4 ppb (1) 0.0 ppb (0) 23.0 ppb (18) 0.11 ppb (1) N/A 5.4 μg/m3 (23) 23.0
 
Sept. 15, 2019, 2 a.m. N/A 0.0 ppb (0) 1.4 ppb (1) N/A 1.4 ppb (1) 0.0 ppb (0) 26.0 ppb (20) 0.11 ppb (1) N/A 5.6 μg/m3 (23) 23.0
 
Sept. 15, 2019, 1 a.m. N/A 0.1 ppb (0) 1.3 ppb (1) N/A 1.2 ppb (1) 0.0 ppb (0) 27.0 ppb (21) 0.1 ppb (1) N/A 5.3 μg/m3 (22) 22.0
 
Sept. 15, 2019, midnight N/A 0.1 ppb (0) 1.2 ppb (1) N/A 1.1 ppb (1) 0.0 ppb (0) 28.0 ppb (22) 0.1 ppb (1) N/A 5.5 μg/m3 (23) 23.0
 
Sept. 14, 2019, 11 p.m. N/A 0.1 ppb (0) 1.2 ppb (1) N/A 1.1 ppb (1) 0.0 ppb (0) 28.0 ppb (22) 0.1 ppb (1) N/A 5.5 μg/m3 (23) 23.0
 
Sept. 14, 2019, 10 p.m. N/A 0.1 ppb (0) 1.1 ppb (1) N/A 1.1 ppb (1) 0.0 ppb (0) 30.0 ppb (23) 0.1 ppb (1) N/A 5.4 μg/m3 (23) 23.0
 
Sept. 14, 2019, 9 p.m. N/A 0.1 ppb (0) 1.1 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 30.0 ppb (23) 0.1 ppb (1) N/A 5.2 μg/m3 (22) 23.0
 
Sept. 14, 2019, 8 p.m. N/A 0.1 ppb (0) 1.0 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 30.0 ppb (23) 0.1 ppb (1) N/A 4.9 μg/m3 (20) 23.0
 
Sept. 14, 2019, 7 p.m. N/A 0.0 ppb (0) 0.9 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 29.0 ppb (22) 0.11 ppb (1) N/A 4.5 μg/m3 (19) 22.0
 
Sept. 14, 2019, 6 p.m. N/A 0.1 ppb (0) 0.9 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 29.0 ppb (22) 0.1 ppb (1) N/A 4.4 μg/m3 (18) 22.0
 
Sept. 14, 2019, 5 p.m. N/A 0.1 ppb (0) 0.9 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 29.0 ppb (22) 0.1 ppb (1) N/A 4.0 μg/m3 (17) 22.0
 
Sept. 14, 2019, 4 p.m. N/A 0.0 ppb (0) 0.9 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 30.0 ppb (23) 0.11 ppb (1) N/A 3.6 μg/m3 (15) 23.0
 
Sept. 14, 2019, 3 p.m. N/A 0.0 ppb (0) 1.0 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 29.0 ppb (22) 0.11 ppb (1) N/A 4.0 μg/m3 (17) 22.0
 
Sept. 14, 2019, 2 p.m. N/A 0.1 ppb (0) 1.0 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 29.0 ppb (22) 0.1 ppb (1) N/A 4.7 μg/m3 (20) 22.0
 
Sept. 14, 2019, 1 p.m. N/A 0.1 ppb (0) 1.1 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 30.0 ppb (23) 0.11 ppb (1) N/A 4.6 μg/m3 (19) 23.0
 
Sept. 14, 2019, noon N/A 0.1 ppb (0) 1.1 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 31.0 ppb (24) 0.11 ppb (1) N/A 4.5 μg/m3 (19) 24.0
 
Sept. 14, 2019, 11 a.m. N/A 0.1 ppb (0) 1.1 ppb (1) N/A 1.1 ppb (1) 0.0 ppb (0) 32.0 ppb (25) 0.11 ppb (1) N/A 4.7 μg/m3 (20) 25.0
 
Sept. 14, 2019, 10 a.m. N/A 0.0 ppb (0) 1.1 ppb (1) N/A 1.1 ppb (1) 0.0 ppb (0) 33.0 ppb (25) 0.11 ppb (1) N/A 4.4 μg/m3 (18) 25.0
 
Sept. 14, 2019, 9 a.m. N/A 0.0 ppb (0) 1.1 ppb (1) N/A 1.1 ppb (1) 0.0 ppb (0) 33.0 ppb (25) 0.11 ppb (1) N/A 3.9 μg/m3 (16) 25.0
 
Sept. 14, 2019, 8 a.m. N/A 0.0 ppb (0) 1.2 ppb (1) N/A 1.1 ppb (1) 0.0 ppb (0) 31.0 ppb (24) N/A N/A 3.8 μg/m3 (16) 24.0
 
Sept. 14, 2019, 7 a.m. N/A 0.1 ppb (0) 1.1 ppb (1) N/A 1.0 ppb (1) N/A 31.0 ppb (24) 0.12 ppb (1) N/A 3.7 μg/m3 (15) 24.0
 
Sept. 14, 2019, 6 a.m. N/A 0.2 ppb (0) 1.1 ppb (1) N/A 0.8 ppb (1) 0.0 ppb (0) N/A 0.12 ppb (1) N/A 3.8 μg/m3 (16) 16.0
 
Sept. 14, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (25) 0.12 ppb (1) N/A 4.0 μg/m3 (17) 25.0
 
Sept. 14, 2019, 4 a.m. N/A 0.0 ppb (0) 1.0 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 34.0 ppb (26) 0.12 ppb (1) N/A 4.0 μg/m3 (17) 26.0
 
Sept. 14, 2019, 3 a.m. N/A 0.0 ppb (0) 0.9 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 35.0 ppb (27) 0.12 ppb (1) N/A 4.1 μg/m3 (17) 27.0
 
Sept. 14, 2019, 2 a.m. N/A 0.0 ppb (0) 0.9 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 36.0 ppb (28) 0.11 ppb (1) N/A 4.0 μg/m3 (17) 28.0
 
Sept. 14, 2019, 1 a.m. N/A 0.0 ppb (0) 0.8 ppb (1) N/A 0.8 ppb (1) 0.0 ppb (0) 36.0 ppb (28) 0.11 ppb (1) N/A 3.9 μg/m3 (16) 28.0
 
Sept. 14, 2019, midnight N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 33.0 ppb (25) 0.11 ppb (1) N/A 3.6 μg/m3 (15) 25.0
 
Sept. 13, 2019, 11 p.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 32.0 ppb (25) 0.11 ppb (1) N/A 3.5 μg/m3 (15) 25.0
 
Sept. 13, 2019, 10 p.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 30.0 ppb (23) 0.11 ppb (1) N/A 3.4 μg/m3 (14) 23.0
 
Sept. 13, 2019, 9 p.m. N/A 0.1 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 31.0 ppb (24) 0.11 ppb (1) N/A 3.4 μg/m3 (14) 24.0
 
Sept. 13, 2019, 8 p.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 31.0 ppb (24) 0.11 ppb (1) N/A 3.5 μg/m3 (15) 24.0
 
Sept. 13, 2019, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (25) 0.12 ppb (1) N/A 3.3 μg/m3 (14) 25.0
 
Sept. 13, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A N/A 3.3 μg/m3 (14) 22.0
 
Sept. 13, 2019, 5 p.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 27.0 ppb (21) 0.11 ppb (1) N/A 3.4 μg/m3 (14) 21.0
 
Sept. 13, 2019, 4 p.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 26.0 ppb (20) 0.11 ppb (1) N/A 3.5 μg/m3 (15) 20.0
 
Sept. 13, 2019, 3 p.m. N/A 0.0 ppb (0) 0.6 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 25.0 ppb (19) 0.12 ppb (1) N/A 3.4 μg/m3 (14) 19.0
 
Sept. 13, 2019, 2 p.m. N/A 0.1 ppb (0) 0.6 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 25.0 ppb (19) 0.12 ppb (1) N/A 3.4 μg/m3 (14) 19.0
 
Sept. 13, 2019, 1 p.m. N/A 0.0 ppb (0) 0.6 ppb (1) N/A 0.5 ppb (0) 0.0 ppb (0) 22.0 ppb (17) 0.1 ppb (1) N/A 3.4 μg/m3 (14) 17.0
 
Sept. 13, 2019, noon N/A 0.0 ppb (0) 0.5 ppb (0) N/A 0.5 ppb (0) 0.0 ppb (0) 18.0 ppb (14) 0.11 ppb (1) N/A 3.4 μg/m3 (14) 14.0
 
Sept. 13, 2019, 11 a.m. N/A 0.0 ppb (0) 0.4 ppb (0) N/A 0.4 ppb (0) 0.0 ppb (0) 18.0 ppb (14) 0.1 ppb (1) N/A 3.5 μg/m3 (15) 15.0
 
Sept. 13, 2019, 10 a.m. N/A 0.0 ppb (0) 0.4 ppb (0) N/A 0.4 ppb (0) 0.0 ppb (0) 20.0 ppb (15) 0.1 ppb (1) N/A 3.4 μg/m3 (14) 15.0
 
Sept. 13, 2019, 9 a.m. N/A 0.0 ppb (0) 0.4 ppb (0) N/A 0.4 ppb (0) 0.0 ppb (0) 17.0 ppb (13) 0.1 ppb (1) N/A 3.4 μg/m3 (14) 14.0
 
Sept. 13, 2019, 8 a.m. N/A 0.0 ppb (0) 0.3 ppb (0) N/A 0.3 ppb (0) 0.0 ppb (0) 18.0 ppb (14) N/A N/A 3.3 μg/m3 (14) 14.0
 
Sept. 13, 2019, 7 a.m. N/A 0.0 ppb (0) 0.3 ppb (0) N/A 0.3 ppb (0) N/A 19.0 ppb (15) 0.09 ppb (1) N/A 3.1 μg/m3 (13) 15.0
 
Sept. 13, 2019, 6 a.m. N/A 0.0 ppb (0) 0.3 ppb (0) N/A 0.3 ppb (0) 0.0 ppb (0) N/A 0.1 ppb (1) N/A 3.1 μg/m3 (13) 13.0
 
Sept. 13, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 19.0 ppb (15) 0.1 ppb (1) N/A 3.1 μg/m3 (13) 15.0
 
Sept. 13, 2019, 4 a.m. N/A 0.0 ppb (0) 0.6 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 22.0 ppb (17) 0.1 ppb (1) N/A 2.9 μg/m3 (12) 17.0
 
Sept. 13, 2019, 3 a.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 21.0 ppb (16) 0.11 ppb (1) N/A 3.1 μg/m3 (13) 16.0
 
Sept. 13, 2019, 2 a.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 21.0 ppb (16) 0.1 ppb (1) N/A 2.9 μg/m3 (12) 16.0
 
Sept. 13, 2019, 1 a.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 20.0 ppb (15) 0.1 ppb (1) N/A 2.5 μg/m3 (10) 15.0
 
Sept. 13, 2019, midnight N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 19.0 ppb (15) 0.1 ppb (1) N/A 3.0 μg/m3 (12) 15.0
 
Sept. 12, 2019, 11 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 17.0 ppb (13) 0.09 ppb (1) N/A 3.3 μg/m3 (14) 14.0
 
Sept. 12, 2019, 10 p.m. N/A 0.0 ppb (0) 0.8 ppb (1) N/A 0.8 ppb (1) 0.0 ppb (0) 21.0 ppb (16) 0.09 ppb (1) N/A 3.7 μg/m3 (15) 16.0
 
Sept. 12, 2019, 9 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.8 ppb (1) 0.0 ppb (0) 25.0 ppb (19) 0.1 ppb (1) N/A 3.8 μg/m3 (16) 19.0
 
Sept. 12, 2019, 8 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 26.0 ppb (20) 0.1 ppb (1) N/A 4.0 μg/m3 (17) 20.0
 
Sept. 12, 2019, 7 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 28.0 ppb (22) 0.1 ppb (1) N/A 3.6 μg/m3 (15) 22.0
 
Sept. 12, 2019, 6 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 26.0 ppb (20) 0.1 ppb (1) N/A 3.3 μg/m3 (14) 20.0
 
Sept. 12, 2019, 5 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 24.0 ppb (18) 0.1 ppb (1) N/A 3.1 μg/m3 (13) 18.0
 
Sept. 12, 2019, 4 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 23.0 ppb (18) 0.11 ppb (1) N/A 2.1 μg/m3 (9) 18.0
 
Sept. 12, 2019, 3 p.m. N/A 0.2 ppb (0) 0.8 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 20.0 ppb (15) 0.1 ppb (1) N/A 1.9 μg/m3 (8) 15.0
 
Sept. 12, 2019, 2 p.m. N/A 0.3 ppb (0) 1.0 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 19.0 ppb (15) 0.1 ppb (1) N/A 2.1 μg/m3 (9) 15.0
 
Sept. 12, 2019, 1 p.m. N/A 0.3 ppb (0) 1.4 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 16.0 ppb (12) 0.1 ppb (1) N/A 2.9 μg/m3 (12) 12.0
 
Sept. 12, 2019, noon N/A 0.1 ppb (0) 1.3 ppb (1) N/A 1.1 ppb (1) 0.0 ppb (0) 12.0 ppb (9) 0.1 ppb (1) N/A 3.7 μg/m3 (15) 15.0
 
Sept. 12, 2019, 11 a.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 13.0 ppb (10) 0.11 ppb (1) N/A 3.7 μg/m3 (15) 15.0
 
Sept. 12, 2019, 10 a.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 12.0 ppb (9) 0.1 ppb (1) N/A 4.4 μg/m3 (18) 18.0
 
Sept. 12, 2019, 9 a.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 13.0 ppb (10) 0.11 ppb (1) N/A 4.1 μg/m3 (17) 17.0
 
Sept. 12, 2019, 8 a.m. N/A 0.1 ppb (0) 0.6 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 15.0 ppb (12) N/A N/A 3.5 μg/m3 (15) 15.0
 
Sept. 12, 2019, 7 a.m. N/A 0.0 ppb (0) 0.6 ppb (1) N/A 0.6 ppb (1) N/A 17.0 ppb (13) 0.11 ppb (1) N/A 3.2 μg/m3 (13) 13.0
 
Sept. 12, 2019, 6 a.m. N/A 0.1 ppb (0) 0.5 ppb (0) N/A 0.4 ppb (0) 0.0 ppb (0) N/A 0.11 ppb (1) N/A 3.3 μg/m3 (14) 14.0
 
Sept. 12, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 20.0 ppb (15) 0.1 ppb (1) N/A 3.3 μg/m3 (14) 15.0
 
Sept. 12, 2019, 4 a.m. N/A 0.0 ppb (0) 1.0 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 19.0 ppb (15) 0.11 ppb (1) N/A 3.6 μg/m3 (15) 15.0
 
Sept. 12, 2019, 3 a.m. N/A 0.1 ppb (0) 1.1 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 18.0 ppb (14) 0.11 ppb (1) N/A 3.4 μg/m3 (14) 14.0
 
Sept. 12, 2019, 2 a.m. N/A 0.1 ppb (0) 1.3 ppb (1) N/A 1.2 ppb (1) 0.0 ppb (0) 15.0 ppb (12) 0.12 ppb (1) N/A 3.6 μg/m3 (15) 15.0
 
Sept. 12, 2019, 1 a.m. N/A 0.1 ppb (0) 1.5 ppb (1) N/A 1.4 ppb (1) 0.0 ppb (0) 15.0 ppb (12) 0.12 ppb (1) N/A 4.7 μg/m3 (20) 20.0
 
Sept. 12, 2019, midnight N/A 0.1 ppb (0) 1.5 ppb (1) N/A 1.4 ppb (1) 0.0 ppb (0) 23.0 ppb (18) 0.12 ppb (1) N/A 5.5 μg/m3 (23) 23.0
 
Sept. 11, 2019, 11 p.m. N/A 0.1 ppb (0) 1.4 ppb (1) N/A 1.3 ppb (1) 0.0 ppb (0) 29.0 ppb (22) 0.12 ppb (1) N/A 7.2 μg/m3 (30) 30.0
 
Sept. 11, 2019, 10 p.m. N/A 0.1 ppb (0) 1.4 ppb (1) N/A 1.3 ppb (1) 0.0 ppb (0) 32.0 ppb (25) 0.12 ppb (1) N/A 7.2 μg/m3 (30) 30.0
 
Sept. 11, 2019, 9 p.m. N/A 0.1 ppb (0) 1.5 ppb (1) N/A 1.4 ppb (1) 0.0 ppb (0) 33.0 ppb (25) 0.12 ppb (1) N/A 6.5 μg/m3 (27) 27.0
 
Sept. 11, 2019, 8 p.m. N/A 0.1 ppb (0) 1.5 ppb (1) N/A 1.4 ppb (1) 0.0 ppb (0) 36.0 ppb (28) 0.11 ppb (1) N/A 5.9 μg/m3 (25) 28.0
 
Sept. 11, 2019, 7 p.m. N/A 0.0 ppb (0) 1.6 ppb (1) N/A 1.6 ppb (1) 0.0 ppb (0) 40.0 ppb (31) 0.12 ppb (1) N/A 6.2 μg/m3 (26) 31.0
 
Sept. 11, 2019, 6 p.m. N/A 0.0 ppb (0) 1.7 ppb (2) N/A 1.6 ppb (1) 0.0 ppb (0) 38.0 ppb (29) 0.14 ppb (2) N/A 5.7 μg/m3 (24) 29.0
 
Sept. 11, 2019, 5 p.m. N/A 0.1 ppb (0) 1.7 ppb (2) N/A 1.6 ppb (1) 0.0 ppb (0) 41.0 ppb (32) 0.14 ppb (2) N/A 6.2 μg/m3 (26) 32.0
 
Sept. 11, 2019, 4 p.m. N/A 0.1 ppb (0) 1.7 ppb (2) N/A 1.6 ppb (1) 0.0 ppb (0) 37.0 ppb (28) 0.15 ppb (2) N/A 6.3 μg/m3 (26) 28.0
 
Sept. 11, 2019, 3 p.m. N/A 0.1 ppb (0) 1.7 ppb (2) N/A 1.6 ppb (1) 0.0 ppb (0) 30.0 ppb (23) 0.15 ppb (2) N/A 6.1 μg/m3 (25) 25.0
 
Sept. 11, 2019, 2 p.m. N/A 0.1 ppb (0) 1.8 ppb (2) N/A 1.7 ppb (2) 0.0 ppb (0) 30.0 ppb (23) 0.15 ppb (2) N/A 6.3 μg/m3 (26) 26.0
 
Sept. 11, 2019, 1 p.m. N/A 0.0 ppb (0) 1.7 ppb (2) N/A 1.7 ppb (2) 0.0 ppb (0) 33.0 ppb (25) 0.16 ppb (2) N/A 6.1 μg/m3 (25) 25.0
 
Sept. 11, 2019, noon N/A 0.0 ppb (0) 1.7 ppb (2) N/A 1.7 ppb (2) 0.0 ppb (0) 33.0 ppb (25) 0.15 ppb (2) N/A 6.8 μg/m3 (28) 28.0
 
Sept. 11, 2019, 11 a.m. N/A 0.1 ppb (0) 1.8 ppb (2) N/A 1.7 ppb (2) 0.0 ppb (0) 33.0 ppb (25) 0.15 ppb (2) N/A 7.3 μg/m3 (30) 30.0
 
Sept. 11, 2019, 10 a.m. N/A 0.0 ppb (0) 1.8 ppb (2) N/A 1.8 ppb (2) 0.0 ppb (0) 35.0 ppb (27) 0.15 ppb (2) N/A 7.6 μg/m3 (32) 32.0
 
Sept. 11, 2019, 9 a.m. N/A 0.1 ppb (0) 1.8 ppb (2) N/A 1.8 ppb (2) 0.0 ppb (0) 34.0 ppb (26) 0.15 ppb (2) N/A 8.4 μg/m3 (35) 35.0
 
Sept. 11, 2019, 8 a.m. N/A 0.1 ppb (0) 1.8 ppb (2) N/A 1.7 ppb (2) 0.0 ppb (0) 35.0 ppb (27) N/A N/A 8.8 μg/m3 (37) 37.0
 
Sept. 11, 2019, 7 a.m. N/A 0.1 ppb (0) 1.8 ppb (2) N/A 1.7 ppb (2) N/A 35.0 ppb (27) 0.14 ppb (2) N/A 8.6 μg/m3 (36) 36.0
 
Sept. 11, 2019, 6 a.m. N/A 0.3 ppb (0) 1.8 ppb (2) N/A 1.6 ppb (1) 0.0 ppb (0) N/A 0.15 ppb (2) N/A 7.6 μg/m3 (32) 32.0
 
Sept. 11, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (26) 0.15 ppb (2) N/A 7.6 μg/m3 (32) 32.0
 
Sept. 11, 2019, 4 a.m. N/A 0.2 ppb (0) 1.9 ppb (2) N/A 1.7 ppb (2) 0.0 ppb (0) 36.0 ppb (28) 0.15 ppb (2) N/A 6.8 μg/m3 (28) 28.0
 
Sept. 11, 2019, 3 a.m. N/A 0.2 ppb (0) 1.6 ppb (1) N/A 1.5 ppb (1) 0.0 ppb (0) 36.0 ppb (28) 0.15 ppb (2) N/A 6.4 μg/m3 (27) 28.0
 
Sept. 11, 2019, 2 a.m. N/A 0.1 ppb (0) 1.5 ppb (1) N/A 1.3 ppb (1) 0.0 ppb (0) 37.0 ppb (28) 0.14 ppb (2) N/A 7.5 μg/m3 (31) 31.0
 
Sept. 11, 2019, 1 a.m. N/A 0.1 ppb (0) 1.4 ppb (1) N/A 1.2 ppb (1) 0.0 ppb (0) 40.0 ppb (31) 0.13 ppb (1) N/A 7.9 μg/m3 (33) 33.0
 
Sept. 11, 2019, midnight N/A 0.1 ppb (0) 1.3 ppb (1) N/A 1.1 ppb (1) 0.0 ppb (0) 39.0 ppb (30) 0.13 ppb (1) N/A 7.5 μg/m3 (31) 31.0
 
Sept. 10, 2019, 11 p.m. N/A 0.1 ppb (0) 1.1 ppb (1) N/A 1.1 ppb (1) 0.0 ppb (0) 38.0 ppb (29) 0.13 ppb (1) N/A 7.2 μg/m3 (30) 30.0
 
Sept. 10, 2019, 10 p.m. N/A 0.1 ppb (0) 1.1 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 37.0 ppb (28) 0.12 ppb (1) N/A 6.1 μg/m3 (25) 28.0
 
Sept. 10, 2019, 9 p.m. N/A 0.1 ppb (0) 1.1 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 35.0 ppb (27) 0.12 ppb (1) N/A 5.6 μg/m3 (23) 27.0
 
Sept. 10, 2019, 8 p.m. N/A 0.1 ppb (0) 1.1 ppb (1) N/A 1.0 ppb (1) 0.0 ppb (0) 32.0 ppb (25) 0.12 ppb (1) N/A 5.4 μg/m3 (23) 25.0
 
Sept. 10, 2019, 7 p.m. N/A 0.1 ppb (0) 1.1 ppb (1) N/A 0.9 ppb (1) 0.0 ppb (0) 34.0 ppb (26) 0.12 ppb (1) N/A 5.4 μg/m3 (23) 26.0
 
Sept. 10, 2019, 6 p.m. N/A 0.1 ppb (0) 1.0 ppb (1) N/A 0.8 ppb (1) 0.0 ppb (0) 33.0 ppb (25) 0.12 ppb (1) N/A N/A 25.0
 
Sept. 10, 2019, 5 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.8 ppb (1) 0.0 ppb (0) 30.0 ppb (23) 0.12 ppb (1) N/A 4.6 μg/m3 (19) 23.0
 
Sept. 10, 2019, 4 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.7 ppb (1) N/A 25.0 ppb (19) 0.11 ppb (1) N/A 4.1 μg/m3 (17) 19.0
 
Sept. 10, 2019, 3 p.m. N/A 0.0 ppb (0) 0.7 ppb (1) N/A 0.7 ppb (1) N/A 25.0 ppb (19) N/A N/A 3.9 μg/m3 (16) 19.0
 
Sept. 10, 2019, 2 p.m. N/A 0.0 ppb (0) 0.6 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) N/A 0.11 ppb (1) N/A 3.8 μg/m3 (16) 16.0
 
Sept. 10, 2019, 1 p.m. N/A 0.0 ppb (0) 0.5 ppb (0) N/A 0.5 ppb (0) 0.0 ppb (0) 24.0 ppb (18) 0.11 ppb (1) N/A 3.7 μg/m3 (15) 18.0
 
Sept. 10, 2019, noon N/A 0.0 ppb (0) 0.5 ppb (0) N/A 0.5 ppb (0) 0.0 ppb (0) 20.0 ppb (15) 0.12 ppb (1) N/A 3.7 μg/m3 (15) 15.0
 
Sept. 10, 2019, 11 a.m. N/A 0.1 ppb (0) 0.5 ppb (0) N/A 0.4 ppb (0) 0.0 ppb (0) 12.0 ppb (9) 0.11 ppb (1) N/A 3.5 μg/m3 (15) 15.0
 
Sept. 10, 2019, 10 a.m. N/A 0.1 ppb (0) 0.4 ppb (0) N/A 0.4 ppb (0) 0.0 ppb (0) 11.0 ppb (8) 0.11 ppb (1) N/A 3.6 μg/m3 (15) 15.0
 
Sept. 10, 2019, 9 a.m. N/A 0.0 ppb (0) 0.4 ppb (0) N/A 0.4 ppb (0) 0.0 ppb (0) 14.0 ppb (11) 0.12 ppb (1) N/A 3.5 μg/m3 (15) 15.0
 
Sept. 10, 2019, 8 a.m. N/A 0.0 ppb (0) 0.4 ppb (0) N/A 0.4 ppb (0) 0.0 ppb (0) 15.0 ppb (12) N/A N/A 3.6 μg/m3 (15) 15.0
 
Sept. 10, 2019, 7 a.m. N/A 0.1 ppb (0) 0.4 ppb (0) N/A 0.4 ppb (0) N/A 17.0 ppb (13) 0.12 ppb (1) N/A 3.6 μg/m3 (15) 15.0
 
Sept. 10, 2019, 6 a.m. N/A 0.3 ppb (0) 0.6 ppb (1) N/A 0.3 ppb (0) 0.0 ppb (0) N/A 0.12 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 10, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 17.0 ppb (13) 0.12 ppb (1) N/A 4.4 μg/m3 (18) 18.0
 
Sept. 10, 2019, 4 a.m. N/A 0.1 ppb (0) 0.6 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 19.0 ppb (15) 0.1 ppb (1) N/A 3.7 μg/m3 (15) 15.0
 
Sept. 10, 2019, 3 a.m. N/A 0.1 ppb (0) 0.7 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 17.0 ppb (13) 0.11 ppb (1) N/A 3.7 μg/m3 (15) 15.0
 
Sept. 10, 2019, 2 a.m. N/A 0.1 ppb (0) 0.7 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 18.0 ppb (14) 0.11 ppb (1) N/A 4.5 μg/m3 (19) 19.0
 
Sept. 10, 2019, 1 a.m. N/A 0.1 ppb (0) 0.7 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 15.0 ppb (12) 0.13 ppb (1) N/A 4.6 μg/m3 (19) 19.0
 
Sept. 10, 2019, midnight N/A 0.1 ppb (0) 0.7 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 17.0 ppb (13) 0.11 ppb (1) N/A 3.7 μg/m3 (15) 15.0
 
Sept. 9, 2019, 11 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 15.0 ppb (12) 0.17 ppb (2) N/A 3.7 μg/m3 (15) 15.0
 
Sept. 9, 2019, 10 p.m. N/A 0.2 ppb (0) 0.8 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 21.0 ppb (16) 0.12 ppb (1) N/A 2.7 μg/m3 (11) 16.0
 
Sept. 9, 2019, 9 p.m. N/A 0.1 ppb (0) 0.8 ppb (1) N/A 0.6 ppb (1) 0.0 ppb (0) 25.0 ppb (19) 0.11 ppb (1) N/A 2.2 μg/m3 (9) 19.0
 
Sept. 9, 2019, 8 p.m. N/A 0.2 ppb (0) 0.9 ppb (1) N/A 0.7 ppb (1) 0.0 ppb (0) 28.0 ppb (22) 0.11 ppb (1) N/A 2.0 μg/m3 (8) 22.0
 
Sept. 9, 2019, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (22) 0.11 ppb (1) N/A 2.1 μg/m3 (9) 22.0
 
Sept. 9, 2019, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (20) 0.11 ppb (1) N/A 2.7 μg/m3 (11) 20.0
 
Sept. 9, 2019, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (19) 0.11 ppb (1) N/A 3.5 μg/m3 (15) 19.0
 
Sept. 9, 2019, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (18) 0.1 ppb (1) N/A 3.8 μg/m3 (16) 18.0