AQSQID: 300310017

Site Name: West Yellowstone Park Ent #2

Location: Gallatin Co, MT

Reporting: True, Located: True

Current AQI: 2.0

Gallatin Co MT, US: 44.657014, -111.089618

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
May 20, 2019, 3 a.m. -0.9 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A N/A 2.0
 
May 20, 2019, 2 a.m. -0.9 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A N/A 2.0
 
May 20, 2019, 1 a.m. -0.9 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
May 20, 2019, midnight -0.8 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
May 19, 2019, 11 p.m. 0.0 ppb (0) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A -1.0 μg/m3 (0) 3.0
 
May 19, 2019, 10 p.m. 0.4 ppb (0) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 19, 2019, 9 p.m. 0.7 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.21 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 19, 2019, 8 p.m. 0.8 ppb (1) 0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
May 19, 2019, 7 p.m. -0.7 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.24 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 19, 2019, 6 p.m. -0.8 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
May 19, 2019, 5 p.m. -0.5 ppb (0) -0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 19, 2019, 4 p.m. -0.8 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
May 19, 2019, 3 p.m. -0.8 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
May 19, 2019, 2 p.m. -0.5 ppb (0) -0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A N/A 2.0
 
May 19, 2019, 1 p.m. 0.0 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A N/A 2.0
 
May 19, 2019, noon -0.6 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 19, 2019, 11 a.m. 1.1 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.2 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
May 19, 2019, 10 a.m. 2.1 ppb (2) 1.2 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
May 19, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -2.0 μg/m3 (0) N/A
May 19, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.0 μg/m3 (0) N/A
May 19, 2019, 7 a.m. -0.7 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 19, 2019, 6 a.m. -0.4 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
May 19, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -3.0 μg/m3 (0) N/A
May 19, 2019, 4 a.m. -0.7 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A N/A 2.0
 
May 19, 2019, 3 a.m. -0.6 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A N/A 2.0
 
May 19, 2019, 2 a.m. -0.5 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
May 19, 2019, 1 a.m. 0.5 ppb (0) 0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
May 19, 2019, midnight 0.3 ppb (0) 0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A -4.0 μg/m3 (0) 2.0
 
May 18, 2019, 11 p.m. 0.3 ppb (0) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A -3.0 μg/m3 (0) 3.0
 
May 18, 2019, 10 p.m. 0.2 ppb (0) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A -1.0 μg/m3 (0) 3.0
 
May 18, 2019, 9 p.m. 0.3 ppb (0) 0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
May 18, 2019, 8 p.m. 0.1 ppb (0) 0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
May 18, 2019, 7 p.m. 2.2 ppb (2) 1.1 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.25 ppb (3) N/A -3.0 μg/m3 (0) 3.0
 
May 18, 2019, 6 p.m. 3.2 ppb (3) 2.1 ppb (2) N/A 1.0 ppb (1) N/A N/A N/A 0.25 ppb (3) N/A -2.0 μg/m3 (0) 3.0
 
May 18, 2019, 5 p.m. 1.9 ppb (2) 1.2 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.25 ppb (3) N/A 0.0 μg/m3 (0) 3.0
 
May 18, 2019, 4 p.m. 6.2 ppb (6) 3.9 ppb (4) N/A 2.0 ppb (2) N/A N/A N/A 0.24 ppb (3) N/A 0.0 μg/m3 (0) 6.0
 
May 18, 2019, 3 p.m. 4.0 ppb (4) 2.7 ppb (3) N/A 1.0 ppb (1) N/A N/A N/A 0.23 ppb (3) N/A 0.0 μg/m3 (0) 4.0
 
May 18, 2019, 2 p.m. 7.3 ppb (7) 5.0 ppb (5) N/A 2.0 ppb (2) N/A N/A N/A 0.24 ppb (3) N/A -1.0 μg/m3 (0) 7.0
 
May 18, 2019, 1 p.m. 2.4 ppb (2) 1.4 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.25 ppb (3) N/A -1.0 μg/m3 (0) 3.0
 
May 18, 2019, noon 0.0 ppb (0) -0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
May 18, 2019, 11 a.m. 0.0 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 18, 2019, 10 a.m. -0.6 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
May 18, 2019, 9 a.m. -0.6 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 18, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -4.0 μg/m3 (0) N/A
May 18, 2019, 7 a.m. -0.6 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A N/A 2.0
 
May 18, 2019, 6 a.m. -0.5 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
May 18, 2019, 5 a.m. -0.4 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
May 18, 2019, 4 a.m. -0.5 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
May 18, 2019, 3 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 18, 2019, 2 a.m. 0.3 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
May 18, 2019, 1 a.m. 1.1 ppb (1) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.23 ppb (3) N/A -1.0 μg/m3 (0) 3.0
 
May 18, 2019, midnight 0.0 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
May 17, 2019, 11 p.m. 0.6 ppb (1) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A -1.0 μg/m3 (0) 3.0
 
May 17, 2019, 10 p.m. 0.6 ppb (1) 0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A 0.0 μg/m3 (0) 3.0
 
May 17, 2019, 9 p.m. 0.7 ppb (1) 0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A -1.0 μg/m3 (0) 3.0
 
May 17, 2019, 8 p.m. 0.5 ppb (0) 0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 17, 2019, 7 p.m. 2.9 ppb (3) 1.3 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.23 ppb (3) N/A 0.0 μg/m3 (0) 3.0
 
May 17, 2019, 6 p.m. 1.3 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.23 ppb (3) N/A -2.0 μg/m3 (0) 3.0
 
May 17, 2019, 5 p.m. 1.7 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.29 ppb (3) N/A -2.0 μg/m3 (0) 3.0
 
May 17, 2019, 4 p.m. 11.5 ppb (11) 8.5 ppb (8) N/A 3.0 ppb (3) N/A N/A N/A 0.24 ppb (3) N/A -2.0 μg/m3 (0) 11.0
 
May 17, 2019, 3 p.m. 2.6 ppb (2) 1.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.23 ppb (3) N/A -1.0 μg/m3 (0) 3.0
 
May 17, 2019, 2 p.m. 5.8 ppb (5) 2.8 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.23 ppb (3) N/A -2.0 μg/m3 (0) 5.0
 
May 17, 2019, 1 p.m. 6.3 ppb (6) 2.3 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.22 ppb (2) N/A -1.0 μg/m3 (0) 6.0
 
May 17, 2019, noon 1.6 ppb (1) 1.5 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A 0.19 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 17, 2019, 11 a.m. -0.5 ppb (0) -0.3 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
May 17, 2019, 10 a.m. -0.9 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A N/A 2.0
 
May 17, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -1.0 μg/m3 (0) N/A
May 17, 2019, 8 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
 
May 17, 2019, 7 a.m. -0.8 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
May 17, 2019, 6 a.m. -0.7 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
May 17, 2019, 5 a.m. -0.7 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 17, 2019, 4 a.m. -0.7 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
May 17, 2019, 3 a.m. -0.3 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.24 ppb (3) N/A -3.0 μg/m3 (0) 3.0
 
May 17, 2019, 2 a.m. 0.0 ppb (0) -0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.25 ppb (3) N/A 1.0 μg/m3 (4) 4.0
 
May 17, 2019, 1 a.m. 0.4 ppb (0) -0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.25 ppb (3) N/A 1.0 μg/m3 (4) 4.0
 
May 17, 2019, midnight 3.2 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.24 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 16, 2019, 11 p.m. 0.6 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
May 16, 2019, 10 p.m. 2.0 ppb (2) 0.8 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.24 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 16, 2019, 9 p.m. 4.8 ppb (4) 1.9 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.24 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 16, 2019, 8 p.m. 3.9 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 16, 2019, 6 p.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
 
May 16, 2019, 5 p.m. 7.7 ppb (7) 3.3 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 16, 2019, 4 p.m. 4.0 ppb (4) 1.4 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.27 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 16, 2019, 3 p.m. 6.5 ppb (6) 3.9 ppb (4) N/A 3.0 ppb (3) N/A N/A N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 16, 2019, 2 p.m. 1.4 ppb (1) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.26 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
May 16, 2019, 1 p.m. 3.6 ppb (3) 1.8 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.24 ppb (3) N/A -4.0 μg/m3 (0) 3.0
 
May 16, 2019, noon 4.7 ppb (4) 2.2 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.25 ppb (3) N/A -3.0 μg/m3 (0) 4.0
 
May 16, 2019, 11 a.m. -0.3 ppb (0) -0.3 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
May 16, 2019, 10 a.m. -0.7 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 16, 2019, 9 a.m. -0.8 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 16, 2019, 8 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
 
May 16, 2019, 7 a.m. -0.8 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A -4.0 μg/m3 (0) 3.0
 
May 16, 2019, 6 a.m. -0.3 ppb (0) -0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A -3.0 μg/m3 (0) 3.0
 
May 16, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -3.0 μg/m3 (0) N/A
May 16, 2019, 4 a.m. -0.6 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.24 ppb (3) N/A -3.0 μg/m3 (0) 3.0
 
May 16, 2019, 3 a.m. 0.6 ppb (1) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.27 ppb (3) N/A -1.0 μg/m3 (0) 3.0
 
May 16, 2019, 2 a.m. 0.0 ppb (0) -0.3 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.25 ppb (3) N/A 0.0 μg/m3 (0) 3.0
 
May 16, 2019, 1 a.m. 0.3 ppb (0) -0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.27 ppb (3) N/A 0.0 μg/m3 (0) 3.0
 
May 16, 2019, midnight 1.7 ppb (2) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.25 ppb (3) N/A 1.0 μg/m3 (4) 4.0
 
May 15, 2019, 11 p.m. 1.0 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.28 ppb (3) N/A 0.0 μg/m3 (0) 3.0
 
May 15, 2019, 10 p.m. 1.9 ppb (2) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.28 ppb (3) N/A -1.0 μg/m3 (0) 3.0
 
May 15, 2019, 9 p.m. 0.8 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.27 ppb (3) N/A -1.0 μg/m3 (0) 3.0
 
May 15, 2019, 8 p.m. 1.7 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.24 ppb (3) N/A -1.0 μg/m3 (0) 3.0
 
May 15, 2019, 7 p.m. 1.0 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.24 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 15, 2019, 6 p.m. 0.5 ppb (0) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.24 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
May 15, 2019, 5 p.m. 0.5 ppb (0) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 15, 2019, 4 p.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 15, 2019, 3 p.m. 0.7 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.27 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 15, 2019, 2 p.m. 3.5 ppb (3) 1.4 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.28 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
May 15, 2019, 1 p.m. 8.4 ppb (8) 5.2 ppb (5) N/A 3.0 ppb (3) N/A N/A N/A 0.27 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 15, 2019, noon 8.4 ppb (8) 6.0 ppb (6) N/A 2.0 ppb (2) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 15, 2019, 11 a.m. -0.2 ppb (0) -0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
May 15, 2019, 10 a.m. 1.4 ppb (1) 0.8 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.22 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 15, 2019, 9 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
 
May 15, 2019, 8 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
 
May 15, 2019, 7 a.m. -0.8 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 15, 2019, 6 a.m. -0.7 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
May 15, 2019, 5 a.m. -0.4 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A -4.0 μg/m3 (0) 3.0
 
May 15, 2019, 4 a.m. 0.0 ppb (0) -0.3 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A 0.0 μg/m3 (0) 3.0
 
May 15, 2019, 3 a.m. 1.7 ppb (2) -0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.26 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
May 15, 2019, 2 a.m. 0.6 ppb (1) -0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.26 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 15, 2019, 1 a.m. 1.7 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.27 ppb (3) N/A 0.0 μg/m3 (0) 3.0
 
May 15, 2019, midnight 0.2 ppb (0) -0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.23 ppb (3) N/A 0.0 μg/m3 (0) 3.0
 
May 14, 2019, 11 p.m. 0.1 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
May 14, 2019, 10 p.m. 0.6 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.22 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 14, 2019, 9 p.m. 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 14, 2019, 8 p.m. 0.6 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.21 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
May 14, 2019, 7 p.m. 5.0 ppb (5) 2.1 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.23 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
May 14, 2019, 6 p.m. -0.2 ppb (0) -0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
May 14, 2019, 5 p.m. 0.0 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
May 14, 2019, 4 p.m. 2.2 ppb (2) 1.2 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.21 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
May 14, 2019, 3 p.m. 5.4 ppb (5) 2.1 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.29 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
May 14, 2019, 2 p.m. 7.4 ppb (7) 2.5 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.29 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 14, 2019, 1 p.m. 27.8 ppb (26) 21.2 ppb (20) N/A 7.0 ppb (6) N/A N/A N/A 0.28 ppb (3) N/A 2.0 μg/m3 (8) 26.0
 
May 14, 2019, noon 15.8 ppb (15) 10.7 ppb (10) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (2) N/A 0.0 μg/m3 (0) 15.0
 
May 14, 2019, 11 a.m. 0.4 ppb (0) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
May 14, 2019, 10 a.m. -0.2 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
May 14, 2019, 9 a.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
May 14, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -2.0 μg/m3 (0) N/A
May 14, 2019, 7 a.m. -0.3 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
May 14, 2019, 6 a.m. -0.3 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 14, 2019, 5 a.m. -0.4 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A 1.0 μg/m3 (4) 4.0
 
May 14, 2019, 4 a.m. -0.6 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 14, 2019, 3 a.m. 0.7 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.25 ppb (3) N/A -1.0 μg/m3 (0) 3.0
 
May 14, 2019, 2 a.m. 0.6 ppb (1) -0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.24 ppb (3) N/A -3.0 μg/m3 (0) 3.0
 
May 14, 2019, 1 a.m. 0.2 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A 1.0 μg/m3 (4) 4.0
 
May 14, 2019, midnight 0.5 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
May 13, 2019, 11 p.m. 1.6 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.22 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
May 13, 2019, 10 p.m. 0.4 ppb (0) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.23 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
May 13, 2019, 9 p.m. 1.8 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.22 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
May 13, 2019, 8 p.m. 0.0 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 13, 2019, 7 p.m. 1.8 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.23 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
May 13, 2019, 6 p.m. 1.7 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.23 ppb (3) N/A 1.0 μg/m3 (4) 4.0
 
May 13, 2019, 5 p.m. 1.7 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.24 ppb (3) N/A -3.0 μg/m3 (0) 3.0
 
May 13, 2019, 4 p.m. 2.8 ppb (3) 1.4 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.24 ppb (3) N/A 18.0 μg/m3 (63) 63.0
 
May 13, 2019, 3 p.m. 6.7 ppb (6) 3.2 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A 0.26 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
May 13, 2019, 2 p.m. 3.4 ppb (3) 1.5 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.24 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
May 13, 2019, 1 p.m. 25.9 ppb (24) 19.6 ppb (18) N/A 6.0 ppb (6) N/A N/A N/A 0.23 ppb (3) N/A 3.0 μg/m3 (12) 24.0
 
May 13, 2019, noon 13.6 ppb (13) 9.2 ppb (9) N/A 4.0 ppb (4) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 13.0
 
May 13, 2019, 11 a.m. -0.1 ppb (0) -0.3 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.19 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
May 13, 2019, 10 a.m. 0.8 ppb (1) -0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.2 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
May 13, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -2.0 μg/m3 (0) N/A
May 13, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -2.0 μg/m3 (0) N/A
May 13, 2019, 7 a.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.22 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
May 13, 2019, 4 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
May 13, 2019, 3 a.m. 4.2 ppb (4) 2.2 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
May 13, 2019, 2 a.m. 0.4 ppb (0) -0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.22 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 13, 2019, 1 a.m. 0.2 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.19 ppb (2) N/A 3.0 μg/m3 (12) 12.0