AQSQID: 300310017

Site Name: West Yellowstone Park Ent #2

Location: W Yellowstone (W Entrance Rd), MT

Reporting: True, Located: True

Current AQI: 3.0

W Yellowstone (W Entrance Rd) MT, US: 44.657014, -111.089618

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Jan. 21, 2020, 10 a.m. 3.2 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.2 ppb (2) N/A -3.0 μg/m3 (0) 3.0
 
Jan. 21, 2020, 9 a.m. 2.8 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (2) N/A 0.0 μg/m3 (0) 3.0
 
Jan. 21, 2020, 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
Jan. 21, 2020, 7 a.m. 3.7 ppb (3) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.2 ppb (2) N/A -2.0 μg/m3 (0) 4.0
 
Jan. 21, 2020, 6 a.m. 3.1 ppb (3) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.21 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 21, 2020, 5 a.m. 2.7 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.2 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 21, 2020, 4 a.m. 4.3 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 21, 2020, 3 a.m. 3.9 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.21 ppb (2) N/A -2.0 μg/m3 (0) 4.0
 
Jan. 21, 2020, 2 a.m. 2.8 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (2) N/A N/A 3.0
 
Jan. 21, 2020, 1 a.m. 5.0 ppb (5) 0.2 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (2) N/A N/A 5.0
 
Jan. 21, 2020, midnight 3.4 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.18 ppb (2) N/A -3.0 μg/m3 (0) 3.0
 
Jan. 20, 2020, 11 p.m. 72.5 ppb (70) 89.5 ppb (88) N/A 15.0 ppb (14) N/A N/A N/A 0.33 ppb (4) N/A 0.0 μg/m3 (0) 88.0
 
Jan. 20, 2020, 10 p.m. 8.7 ppb (8) 4.4 ppb (4) N/A 2.0 ppb (2) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 8.0
 
Jan. 20, 2020, 9 p.m. 2.1 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 20, 2020, 8 p.m. 7.3 ppb (7) 2.3 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 20, 2020, 7 p.m. 8.1 ppb (8) 2.6 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.28 ppb (3) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 20, 2020, 6 p.m. 7.0 ppb (6) 2.4 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.29 ppb (3) N/A 1.0 μg/m3 (4) 6.0
 
Jan. 20, 2020, 5 p.m. 3.2 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.22 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 20, 2020, 4 p.m. 6.3 ppb (6) 2.8 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A 0.23 ppb (3) N/A -2.0 μg/m3 (0) 6.0
 
Jan. 20, 2020, 3 p.m. 15.9 ppb (15) 1.5 ppb (1) N/A 15.0 ppb (14) N/A N/A N/A 0.32 ppb (4) N/A -4.0 μg/m3 (0) 15.0
 
Jan. 20, 2020, 2 p.m. 4.1 ppb (4) 0.4 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.16 ppb (2) N/A -4.0 μg/m3 (0) 5.0
 
Jan. 20, 2020, 1 p.m. 3.1 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.15 ppb (2) N/A -2.0 μg/m3 (0) 3.0
 
Jan. 20, 2020, noon 6.0 ppb (6) 0.2 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.19 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 20, 2020, 11 a.m. 6.7 ppb (6) 0.2 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 20, 2020, 10 a.m. 4.4 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.16 ppb (2) N/A -1.0 μg/m3 (0) 4.0
 
Jan. 20, 2020, 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
Jan. 20, 2020, 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
Jan. 20, 2020, 7 a.m. 1.4 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
Jan. 20, 2020, 6 a.m. 21.9 ppb (20) 1.5 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.15 ppb (2) N/A 2.0 μg/m3 (8) 20.0
 
Jan. 20, 2020, 5 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
 
Jan. 20, 2020, 4 a.m. 1.7 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
Jan. 20, 2020, 3 a.m. 1.6 ppb (1) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.14 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 20, 2020, 2 a.m. 2.2 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
Jan. 20, 2020, 1 a.m. 3.9 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.21 ppb (2) N/A -3.0 μg/m3 (0) 4.0
 
Jan. 20, 2020, midnight 2.8 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.17 ppb (2) N/A -4.0 μg/m3 (0) 3.0
 
Jan. 19, 2020, 11 p.m. 23.7 ppb (22) 10.9 ppb (10) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (2) N/A -1.0 μg/m3 (0) 22.0
 
Jan. 19, 2020, 10 p.m. 8.4 ppb (8) 6.9 ppb (6) N/A 3.0 ppb (3) N/A N/A N/A 0.17 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 19, 2020, 9 p.m. 0.9 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 19, 2020, 8 p.m. 1.2 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 19, 2020, 7 p.m. 0.8 ppb (1) 0.3 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
 
Jan. 19, 2020, 6 p.m. 1.1 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
 
Jan. 19, 2020, 5 p.m. 4.6 ppb (4) 1.9 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.3 ppb (3) N/A -2.0 μg/m3 (0) 4.0
 
Jan. 19, 2020, 4 p.m. 47.7 ppb (44) 34.1 ppb (32) N/A 13.0 ppb (12) N/A N/A N/A 0.74 ppb (8) N/A -4.0 μg/m3 (0) 44.0
 
Jan. 19, 2020, 3 p.m. 21.9 ppb (20) 11.9 ppb (11) N/A 10.0 ppb (9) N/A N/A N/A 0.37 ppb (4) N/A -2.0 μg/m3 (0) 20.0
 
Jan. 19, 2020, 2 p.m. 4.7 ppb (4) 1.2 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.19 ppb (2) N/A -3.0 μg/m3 (0) 4.0
 
Jan. 19, 2020, 1 p.m. 2.4 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
Jan. 19, 2020, noon 1.9 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.15 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
Jan. 19, 2020, 11 a.m. 2.3 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.15 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
Jan. 19, 2020, 10 a.m. 1.3 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A -4.0 μg/m3 (0) 2.0
 
Jan. 19, 2020, 9 a.m. 0.6 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.13 ppb (1) N/A -1.0 μg/m3 (0) 1.0
 
Jan. 19, 2020, 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
Jan. 19, 2020, 7 a.m. 0.8 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
Jan. 19, 2020, 6 a.m. 0.5 ppb (0) 0.1 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
 
Jan. 19, 2020, 5 a.m. 0.5 ppb (0) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.16 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 19, 2020, 4 a.m. 0.7 ppb (1) 0.1 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
 
Jan. 19, 2020, 3 a.m. 0.9 ppb (1) 0.1 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
 
Jan. 19, 2020, 2 a.m. 0.8 ppb (1) 0.1 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
 
Jan. 19, 2020, 1 a.m. 1.0 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
Jan. 19, 2020, midnight 1.4 ppb (1) 0.4 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
 
Jan. 18, 2020, 11 p.m. 33.2 ppb (31) 17.4 ppb (16) N/A 2.0 ppb (2) N/A N/A N/A 0.19 ppb (2) N/A 0.0 μg/m3 (0) 31.0
 
Jan. 18, 2020, 10 p.m. 12.0 ppb (11) 6.0 ppb (6) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (2) N/A -1.0 μg/m3 (0) 11.0
 
Jan. 18, 2020, 9 p.m. 1.3 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
Jan. 18, 2020, 8 p.m. 0.7 ppb (1) 0.2 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
 
Jan. 18, 2020, 7 p.m. 0.7 ppb (1) 0.3 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.17 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 18, 2020, 6 p.m. 1.1 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 18, 2020, 5 p.m. 1.1 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 18, 2020, 4 p.m. 11.6 ppb (11) 4.6 ppb (4) N/A 3.0 ppb (3) N/A N/A N/A 0.28 ppb (3) N/A 0.0 μg/m3 (0) 11.0
 
Jan. 18, 2020, 3 p.m. 1.6 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 18, 2020, 2 p.m. 0.6 ppb (1) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.14 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
Jan. 18, 2020, 1 p.m. 0.6 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
Jan. 18, 2020, noon 0.9 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
Jan. 18, 2020, 11 a.m. 0.5 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.15 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
Jan. 18, 2020, 10 a.m. 0.6 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
Jan. 18, 2020, 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
 
Jan. 18, 2020, 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
Jan. 18, 2020, 7 a.m. 1.4 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
Jan. 18, 2020, 6 a.m. 1.2 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
Jan. 18, 2020, 5 a.m. 1.1 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.18 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 18, 2020, 4 a.m. 1.4 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 18, 2020, 3 a.m. 1.5 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A N/A 2.0
 
Jan. 18, 2020, 2 a.m. 1.1 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A N/A 2.0
 
Jan. 18, 2020, 1 a.m. 1.8 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A N/A 2.0
 
Jan. 18, 2020, midnight 34.6 ppb (32) 41.3 ppb (38) N/A 9.0 ppb (8) N/A N/A N/A 0.18 ppb (2) N/A N/A 38.0
 
Jan. 17, 2020, 11 p.m. 27.2 ppb (25) 12.2 ppb (11) N/A 10.0 ppb (9) N/A N/A N/A 0.19 ppb (2) N/A N/A 25.0
 
Jan. 17, 2020, 10 p.m. 5.9 ppb (5) 4.2 ppb (4) N/A 2.0 ppb (2) N/A N/A N/A 0.15 ppb (2) N/A N/A 5.0
 
Jan. 17, 2020, 9 p.m. 2.1 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A N/A 2.0
 
Jan. 17, 2020, 8 p.m. 2.7 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.16 ppb (2) N/A -3.0 μg/m3 (0) 3.0
 
Jan. 17, 2020, 7 p.m. 0.7 ppb (1) 0.3 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
 
Jan. 17, 2020, 6 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 -3.0 μg/m3 (0) 2.0
 
Jan. 17, 2020, 5 p.m. 2.1 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A N/A 2.0
 
Jan. 17, 2020, 4 p.m. 4.1 ppb (4) 1.7 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.22 ppb (2) N/A N/A 4.0
 
Jan. 17, 2020, 3 p.m. 1.6 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.17 ppb (2) N/A N/A 2.0
 
Jan. 17, 2020, 2 p.m. 1.3 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
 
Jan. 17, 2020, 1 p.m. 1.0 ppb (1) 0.1 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
 
Jan. 17, 2020, noon 1.1 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 17, 2020, 11 a.m. 1.0 ppb (1) 0.1 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
 
Jan. 17, 2020, 10 a.m. 1.2 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 17, 2020, 9 a.m. 2.4 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.15 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
Jan. 17, 2020, 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
Jan. 17, 2020, 7 a.m. 4.7 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.23 ppb (3) N/A -2.0 μg/m3 (0) 4.0
 
Jan. 17, 2020, 6 a.m. 8.2 ppb (8) 0.4 ppb (0) N/A 8.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A -4.0 μg/m3 (0) 8.0
 
Jan. 17, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Jan. 17, 2020, 4 a.m. 10.6 ppb (10) 0.3 ppb (0) N/A 10.0 ppb (9) N/A N/A N/A 0.27 ppb (3) N/A -2.0 μg/m3 (0) 10.0
 
Jan. 17, 2020, 3 a.m. 18.4 ppb (17) 0.6 ppb (1) N/A 18.0 ppb (17) N/A N/A N/A 0.33 ppb (4) N/A -1.0 μg/m3 (0) 17.0
 
Jan. 17, 2020, 2 a.m. 25.3 ppb (23) 1.2 ppb (1) N/A 24.0 ppb (22) N/A N/A N/A 0.33 ppb (4) N/A -2.0 μg/m3 (0) 23.0
 
Jan. 17, 2020, 1 a.m. 26.0 ppb (24) 1.7 ppb (2) N/A 25.0 ppb (23) N/A N/A N/A 0.35 ppb (4) N/A -2.0 μg/m3 (0) 24.0
 
Jan. 17, 2020, midnight 30.0 ppb (28) 3.3 ppb (3) N/A 26.0 ppb (24) N/A N/A N/A 0.43 ppb (5) N/A 1.0 μg/m3 (4) 28.0
 
Jan. 16, 2020, 11 p.m. 60.0 ppb (56) 25.7 ppb (24) N/A 17.0 ppb (16) N/A N/A N/A 0.35 ppb (4) N/A 4.0 μg/m3 (17) 56.0
 
Jan. 16, 2020, 10 p.m. 13.7 ppb (13) 3.5 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.27 ppb (3) N/A 1.0 μg/m3 (4) 13.0
 
Jan. 16, 2020, 9 p.m. 6.6 ppb (6) 1.8 ppb (2) 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
 
Jan. 16, 2020, 8 p.m. 5.8 ppb (5) 1.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 16, 2020, 7 p.m. 3.9 ppb (4) 1.1 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 16, 2020, 6 p.m. 2.6 ppb (2) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 16, 2020, 5 p.m. 12.2 ppb (11) 3.5 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.28 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
Jan. 16, 2020, 4 p.m. 46.9 ppb (43) 24.5 ppb (23) N/A 21.0 ppb (19) N/A N/A N/A 0.54 ppb (6) N/A 2.0 μg/m3 (8) 43.0
 
Jan. 16, 2020, 3 p.m. 13.3 ppb (12) 5.1 ppb (5) N/A 12.0 ppb (11) N/A N/A N/A 0.33 ppb (4) N/A -1.0 μg/m3 (0) 12.0
 
Jan. 16, 2020, 2 p.m. 6.4 ppb (6) 0.2 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 16, 2020, 1 p.m. 9.6 ppb (9) 0.2 ppb (0) N/A 9.0 ppb (8) N/A N/A N/A 0.18 ppb (2) N/A -1.0 μg/m3 (0) 9.0
 
Jan. 16, 2020, noon 4.5 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.17 ppb (2) N/A N/A 4.0
 
Jan. 16, 2020, 11 a.m. 2.0 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.27 ppb (3) N/A -1.0 μg/m3 (0) 3.0
 
Jan. 16, 2020, 10 a.m. 0.9 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.21 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
Jan. 16, 2020, 9 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
Jan. 16, 2020, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Jan. 16, 2020, 7 a.m. 0.9 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
Jan. 16, 2020, 6 a.m. 1.7 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.15 ppb (2) N/A -4.0 μg/m3 (0) 2.0
 
Jan. 16, 2020, 5 a.m. 0.7 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A -4.0 μg/m3 (0) 2.0
 
Jan. 16, 2020, 4 a.m. 0.7 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
Jan. 16, 2020, 3 a.m. 5.4 ppb (5) 0.2 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.15 ppb (2) N/A -3.0 μg/m3 (0) 5.0
 
Jan. 16, 2020, 2 a.m. 10.1 ppb (9) 1.2 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.15 ppb (2) N/A -4.0 μg/m3 (0) 9.0
 
Jan. 16, 2020, 1 a.m. 23.0 ppb (21) 2.3 ppb (2) N/A 21.0 ppb (19) N/A N/A N/A 0.23 ppb (3) N/A N/A 21.0
 
Jan. 16, 2020, midnight 23.1 ppb (21) 5.3 ppb (5) N/A 19.0 ppb (18) N/A N/A N/A 0.27 ppb (3) N/A N/A 21.0
 
Jan. 15, 2020, 11 p.m. 25.4 ppb (24) 20.6 ppb (19) N/A 8.0 ppb (7) N/A N/A N/A 0.2 ppb (2) N/A N/A 24.0
 
Jan. 15, 2020, 10 p.m. 8.9 ppb (8) 7.1 ppb (7) N/A 2.0 ppb (2) N/A N/A N/A 0.17 ppb (2) N/A -4.0 μg/m3 (0) 8.0
 
Jan. 15, 2020, 9 p.m. 1.0 ppb (1) 0.5 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
 
Jan. 15, 2020, 8 p.m. 0.9 ppb (1) 0.3 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
 
Jan. 15, 2020, 7 p.m. 1.0 ppb (1) 0.4 ppb (0) 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
 
Jan. 15, 2020, 6 p.m. 1.0 ppb (1) 0.5 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
 
Jan. 15, 2020, 5 p.m. 1.5 ppb (1) 0.3 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
 
Jan. 15, 2020, 4 p.m. 17.4 ppb (16) 7.7 ppb (7) N/A 8.0 ppb (7) N/A N/A N/A 0.27 ppb (3) N/A -1.0 μg/m3 (0) 16.0
 
Jan. 15, 2020, 3 p.m. 19.6 ppb (18) 14.2 ppb (13) N/A 7.0 ppb (6) N/A N/A N/A 0.68 ppb (8) N/A -4.0 μg/m3 (0) 18.0
 
Jan. 15, 2020, 2 p.m. 7.0 ppb (6) 1.4 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.26 ppb (3) N/A N/A 6.0
 
Jan. 15, 2020, 1 p.m. 5.1 ppb (5) 0.7 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.26 ppb (3) N/A -3.0 μg/m3 (0) 5.0
 
Jan. 15, 2020, noon 1.8 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.25 ppb (3) N/A N/A 3.0
 
Jan. 15, 2020, 11 a.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 N/A 3.0
 
Jan. 15, 2020, 10 a.m. 0.5 ppb (0) 0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.24 ppb (3) N/A N/A 3.0
 
Jan. 14, 2020, 8 p.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
Jan. 14, 2020, 7 p.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 14, 2020, 6 p.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.16 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 14, 2020, 5 p.m. 0.9 ppb (1) 0.5 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
 
Jan. 14, 2020, 4 p.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.21 ppb (2) N/A N/A 2.0
 
Jan. 14, 2020, 3 p.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A -4.0 μg/m3 (0) 2.0
 
Jan. 14, 2020, 2 p.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A 0.0 μg/m3 (0) 2.0
 
Jan. 14, 2020, 1 p.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
Jan. 14, 2020, noon 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
Jan. 14, 2020, 11 a.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A -3.0 μg/m3 (0) 2.0
 
Jan. 14, 2020, 10 a.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
Jan. 14, 2020, 9 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
Jan. 14, 2020, 8 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
Jan. 14, 2020, 7 a.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
Jan. 14, 2020, 6 a.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
Jan. 14, 2020, 5 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
 
Jan. 14, 2020, 4 a.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
Jan. 14, 2020, 3 a.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
Jan. 14, 2020, 2 a.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
Jan. 14, 2020, 1 a.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A N/A 2.0
 
Jan. 14, 2020, midnight 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A -2.0 μg/m3 (0) 2.0
 
Jan. 13, 2020, 11 p.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.14 ppb (2) N/A -1.0 μg/m3 (0) 2.0
 
Jan. 13, 2020, 10 p.m. 0.9 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.15 ppb (2) N/A -1.0 μg/m3 (0) 2.0