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
March 19, 2019, midnight 0.0 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
March 18, 2019, 11 p.m. 0.0 ppb (0) 0.0 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
 
March 18, 2019, 10 p.m. 0.0 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 18, 2019, 9 p.m. 1.0 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.2 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 18, 2019, 8 p.m. 0.4 ppb (0) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 18, 2019, 7 p.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.19 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 6 p.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, 5 p.m. 2.2 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 18, 2019, 4 p.m. 8.5 ppb (8) 3.5 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.23 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
March 18, 2019, 3 p.m. 3.1 ppb (3) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.2 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 18, 2019, 2 p.m. 0.5 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
 
March 18, 2019, 1 p.m. 2.0 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 18, 2019, noon 1.4 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 18, 2019, 11 a.m. 0.4 ppb (0) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 18, 2019, 10 a.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.19 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 18, 2019, 9 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
March 18, 2019, 8 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
March 18, 2019, 7 a.m. 0.9 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.2 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
March 18, 2019, 6 a.m. 0.8 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.2 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 18, 2019, 5 a.m. 3.0 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 18, 2019, 4 a.m. 2.4 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.2 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
March 18, 2019, 3 a.m. 0.8 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
March 18, 2019, 2 a.m. 1.5 ppb (1) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.19 ppb (2) N/A N/A 2.0
 
March 18, 2019, 1 a.m. 0.6 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A N/A 2.0
 
March 18, 2019, midnight 0.8 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A N/A 2.0
 
March 17, 2019, 11 p.m. 0.3 ppb (0) 0.0 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
 
March 17, 2019, 10 p.m. 0.4 ppb (0) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 17, 2019, 9 p.m. 0.8 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.2 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 17, 2019, 8 p.m. 1.5 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 7 p.m. 1.3 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.22 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 17, 2019, 6 p.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 17, 2019, 5 p.m. 2.0 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 4 p.m. 6.1 ppb (6) 2.2 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 17, 2019, 3 p.m. 6.6 ppb (6) 2.1 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.22 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 17, 2019, 2 p.m. 0.4 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 17, 2019, 1 p.m. 0.0 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 17, 2019, noon 0.1 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.16 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
March 17, 2019, 11 a.m. 0.1 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 17, 2019, 10 a.m. 0.4 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
March 17, 2019, 9 a.m. 0.8 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
March 17, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
March 17, 2019, 7 a.m. 0.5 ppb (0) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 17, 2019, 6 a.m. 1.5 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 17, 2019, 5 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
March 17, 2019, 4 a.m. 0.1 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 17, 2019, 3 a.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
March 17, 2019, 2 a.m. 0.1 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
March 17, 2019, 1 a.m. 0.1 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
March 17, 2019, midnight 0.1 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 16, 2019, 11 p.m. 0.2 ppb (0) 0.0 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
 
March 16, 2019, 10 p.m. 0.6 ppb (1) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.19 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 16, 2019, 9 p.m. 1.2 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 16, 2019, 8 p.m. 0.9 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 16, 2019, 7 p.m. 0.8 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.21 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 16, 2019, 6 p.m. 1.5 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 16, 2019, 5 p.m. 2.5 ppb (2) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.21 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 16, 2019, 4 p.m. 2.2 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.2 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 16, 2019, 3 p.m. 8.3 ppb (8) 2.7 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.31 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
March 16, 2019, 2 p.m. 1.5 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
March 16, 2019, 1 p.m. 0.5 ppb (0) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A N/A 2.0
 
March 16, 2019, noon 1.7 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (2) N/A -4.0 μg/m3 (0) 2.0
 
March 16, 2019, 11 a.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
March 16, 2019, 10 a.m. 0.7 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 16, 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
March 16, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
March 16, 2019, 7 a.m. 0.5 ppb (0) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 16, 2019, 6 a.m. 0.6 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 16, 2019, 5 a.m. 0.5 ppb (0) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 16, 2019, 4 a.m. 0.5 ppb (0) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 16, 2019, 3 a.m. 0.6 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
March 16, 2019, 2 a.m. 0.7 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
March 16, 2019, 1 a.m. 0.7 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
March 16, 2019, midnight 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 15, 2019, 11 p.m. 0.6 ppb (1) 0.2 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
 
March 15, 2019, 10 p.m. 7.6 ppb (7) 3.1 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (2) N/A -1.0 μg/m3 (0) 7.0
 
March 15, 2019, 9 p.m. 1.5 ppb (1) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.21 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 15, 2019, 8 p.m. 0.5 ppb (0) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 15, 2019, 7 p.m. 0.7 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 15, 2019, 6 p.m. 1.2 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 15, 2019, 5 p.m. 1.3 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 15, 2019, 4 p.m. 1.4 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 15, 2019, 3 p.m. 17.6 ppb (16) 9.1 ppb (8) N/A 8.0 ppb (7) N/A N/A N/A 0.41 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
March 15, 2019, 2 p.m. 6.3 ppb (6) 1.4 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.2 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 15, 2019, 1 p.m. 4.1 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 15, 2019, noon 7.5 ppb (7) 0.1 ppb (0) N/A 7.0 ppb (6) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 15, 2019, 11 a.m. 6.7 ppb (6) 0.0 ppb (0) N/A 7.0 ppb (6) N/A N/A N/A 0.19 ppb (2) N/A 1.0 μg/m3 (4) 6.0
 
March 15, 2019, 10 a.m. 2.5 ppb (2) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 15, 2019, 9 a.m. 0.4 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.16 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 15, 2019, 8 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
 
March 15, 2019, 7 a.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 15, 2019, 6 a.m. 0.8 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.2 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
March 15, 2019, 5 a.m. 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.19 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
March 15, 2019, 4 a.m. 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 15, 2019, 3 a.m. 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 15, 2019, 2 a.m. 0.4 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 15, 2019, 1 a.m. 0.1 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.19 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
March 15, 2019, midnight 0.6 ppb (1) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
March 14, 2019, 11 p.m. 0.4 ppb (0) 0.1 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
 
March 14, 2019, 10 p.m. 4.3 ppb (4) 2.9 ppb (3) N/A 1.0 ppb (1) N/A N/A N/A 0.21 ppb (2) N/A 0.0 μg/m3 (0) 4.0
 
March 14, 2019, 9 p.m. 2.3 ppb (2) 1.0 ppb (1) 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
 
March 14, 2019, 8 p.m. 0.4 ppb (0) 0.1 ppb (0) 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
 
March 14, 2019, 7 p.m. 0.9 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 (4) 4.0
 
March 14, 2019, 6 p.m. 0.6 ppb (1) 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 (4) 4.0
 
March 14, 2019, 5 p.m. 2.0 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.2 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 14, 2019, 4 p.m. 1.7 ppb (2) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 14, 2019, 3 p.m. 16.4 ppb (15) 5.7 ppb (5) N/A 11.0 ppb (10) N/A N/A N/A 0.31 ppb (3) N/A 2.0 μg/m3 (8) 15.0
 
March 14, 2019, 2 p.m. 8.8 ppb (8) 2.3 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.24 ppb (3) N/A 1.0 μg/m3 (4) 8.0
 
March 14, 2019, 1 p.m. 1.1 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.21 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 14, 2019, noon 2.1 ppb (2) 0.0 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
 
March 14, 2019, 11 a.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.15 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 14, 2019, 10 a.m. 0.9 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 14, 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
March 14, 2019, 8 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
March 14, 2019, 7 a.m. 0.1 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.19 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 14, 2019, 6 a.m. 0.4 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 14, 2019, 5 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
March 14, 2019, 4 a.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
March 14, 2019, 3 a.m. 0.4 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.19 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
March 14, 2019, 2 a.m. 0.4 ppb (0) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.19 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
March 14, 2019, 1 a.m. 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.19 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
March 14, 2019, midnight 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 13, 2019, 11 p.m. 0.0 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 13, 2019, 10 p.m. 0.0 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 13, 2019, 9 p.m. 0.8 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 13, 2019, 8 p.m. 0.1 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
March 13, 2019, 7 p.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 13, 2019, 6 p.m. 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 13, 2019, 5 p.m. 0.5 ppb (0) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 13, 2019, 4 p.m. 15.7 ppb (15) 5.4 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A 0.24 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 13, 2019, 3 p.m. 43.6 ppb (40) 23.9 ppb (22) N/A 20.0 ppb (19) N/A N/A N/A 0.57 ppb (6) N/A 1.0 μg/m3 (4) 40.0
 
March 13, 2019, 2 p.m. 20.0 ppb (19) 7.1 ppb (7) N/A 13.0 ppb (12) N/A N/A N/A 0.26 ppb (3) N/A -4.0 μg/m3 (0) 19.0
 
March 13, 2019, 1 p.m. 3.3 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.19 ppb (2) N/A -4.0 μg/m3 (0) 3.0
 
March 13, 2019, noon 1.3 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 13, 2019, 11 a.m. 1.3 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 13, 2019, 10 a.m. 2.6 ppb (2) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (2) N/A -1.0 μg/m3 (0) 3.0
 
March 13, 2019, 9 a.m. 2.8 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (2) N/A -1.0 μg/m3 (0) 3.0
 
March 13, 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
March 13, 2019, 7 a.m. 3.2 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (2) N/A -2.0 μg/m3 (0) 3.0
 
March 13, 2019, 6 a.m. 2.4 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.19 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 13, 2019, 5 a.m. 2.3 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.18 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 13, 2019, 4 a.m. 2.4 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.17 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 13, 2019, 3 a.m. 0.4 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 13, 2019, 2 a.m. 1.1 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
March 13, 2019, 1 a.m. 0.4 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 13, 2019, midnight 0.1 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 12, 2019, 11 p.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.19 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
March 12, 2019, 10 p.m. 3.0 ppb (3) 1.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.2 ppb (2) N/A 0.0 μg/m3 (0) 3.0
 
March 12, 2019, 9 p.m. 6.0 ppb (6) 3.8 ppb (4) N/A 2.0 ppb (2) N/A N/A N/A 0.2 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
March 12, 2019, 8 p.m. 0.5 ppb (0) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 12, 2019, 7 p.m. 0.6 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.22 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
March 12, 2019, 6 p.m. 2.8 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.22 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 12, 2019, 5 p.m. 13.2 ppb (12) 6.1 ppb (6) N/A 7.0 ppb (6) N/A N/A N/A 0.28 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 12, 2019, 4 p.m. 6.5 ppb (6) 1.8 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 12, 2019, 3 p.m. 31.5 ppb (29) 10.4 ppb (10) N/A 21.0 ppb (19) N/A N/A N/A 0.44 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
March 12, 2019, 2 p.m. 26.9 ppb (25) 10.5 ppb (10) N/A 16.0 ppb (15) N/A N/A N/A 0.36 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 12, 2019, 1 p.m. 4.0 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.23 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
March 12, 2019, noon 4.8 ppb (4) 0.0 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.22 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 12, 2019, 11 a.m. 2.3 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.19 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
March 12, 2019, 10 a.m. 1.2 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
March 12, 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 (4) 4.0
 
March 12, 2019, 8 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
March 12, 2019, 7 a.m. 0.5 ppb (0) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A -4.0 μg/m3 (0) 2.0
 
March 12, 2019, 6 a.m. 0.1 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
March 12, 2019, 5 a.m. 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
March 12, 2019, 4 a.m. 3.4 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (2) N/A -3.0 μg/m3 (0) 3.0
 
March 12, 2019, 3 a.m. 0.0 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.16 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
March 12, 2019, 2 a.m. 0.0 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.16 ppb (2) N/A N/A 2.0
 
March 12, 2019, 1 a.m. 0.0 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A N/A 2.0