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
July 23, 2019, 3 a.m. 2.1 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -4.0 μg/m3 (0) 2.0
 
July 23, 2019, 2 a.m. 1.5 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 1.0
 
July 23, 2019, 1 a.m. 1.5 ppb (1) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
July 23, 2019, midnight 1.6 ppb (1) 1.1 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
July 22, 2019, 11 p.m. 1.6 ppb (1) 0.8 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
July 22, 2019, 10 p.m. 2.0 ppb (2) 0.9 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
July 22, 2019, 9 p.m. 2.9 ppb (3) 1.3 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
July 22, 2019, 8 p.m. 3.2 ppb (3) 1.4 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 14.0 μg/m3 (54) 54.0
 
July 22, 2019, 7 p.m. 3.4 ppb (3) 1.7 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 16.0 μg/m3 (59) 59.0
 
July 22, 2019, 6 p.m. 3.8 ppb (4) 1.9 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 41.0 μg/m3 (114) 114.0
 
July 22, 2019, 5 p.m. 6.5 ppb (6) 4.9 ppb (5) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 18.0 μg/m3 (63) 63.0
 
July 22, 2019, 4 p.m. 2.6 ppb (2) 1.5 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
July 22, 2019, 3 p.m. 4.8 ppb (4) 3.0 ppb (3) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
July 22, 2019, 2 p.m. 4.4 ppb (4) 1.7 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
July 22, 2019, 1 p.m. 15.8 ppb (15) 12.1 ppb (11) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
July 22, 2019, noon 21.0 ppb (19) 17.7 ppb (16) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 19.0
 
July 22, 2019, 11 a.m. 2.4 ppb (2) 1.1 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
July 22, 2019, 10 a.m. 3.8 ppb (4) 2.5 ppb (2) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 4.0
 
July 22, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
July 22, 2019, 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
July 22, 2019, 7 a.m. -0.1 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A N/A N/A
July 22, 2019, 6 a.m. 0.7 ppb (1) -0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -3.0 μg/m3 (0) 1.0
 
July 22, 2019, 5 a.m. 2.1 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 2.0
 
July 22, 2019, 4 a.m. 2.6 ppb (2) 1.5 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -3.0 μg/m3 (0) 2.0
 
July 22, 2019, 3 a.m. 12.8 ppb (12) 4.8 ppb (4) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 12.0
 
July 22, 2019, 2 a.m. 3.6 ppb (3) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
July 22, 2019, 1 a.m. 5.9 ppb (5) 2.7 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
July 22, 2019, midnight 3.1 ppb (3) 1.4 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
July 21, 2019, 11 p.m. 3.2 ppb (3) 1.8 ppb (2) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
July 21, 2019, 10 p.m. 4.0 ppb (4) 2.3 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
July 21, 2019, 9 p.m. 2.9 ppb (3) 1.8 ppb (2) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
July 21, 2019, 8 p.m. 1.1 ppb (1) 0.6 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 16.0 μg/m3 (59) 59.0
 
July 21, 2019, 7 p.m. 3.9 ppb (4) 2.2 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 27.0 μg/m3 (82) 82.0
 
July 21, 2019, 6 p.m. 6.9 ppb (6) 3.2 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 18.0 μg/m3 (63) 63.0
 
July 21, 2019, 5 p.m. 2.4 ppb (2) 1.5 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
July 21, 2019, 4 p.m. 1.1 ppb (1) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
July 21, 2019, 3 p.m. 1.9 ppb (2) 0.9 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
July 21, 2019, 2 p.m. 3.7 ppb (3) 1.5 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
July 21, 2019, 1 p.m. 19.2 ppb (18) 12.9 ppb (12) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
July 21, 2019, noon 13.0 ppb (12) 8.8 ppb (8) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
July 21, 2019, 11 a.m. 5.5 ppb (5) 1.1 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
July 21, 2019, 10 a.m. 5.5 ppb (5) 2.5 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 5.0
 
July 21, 2019, 9 a.m. 0.0 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A N/A N/A
July 21, 2019, 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
July 21, 2019, 7 a.m. 0.0 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A N/A N/A
July 21, 2019, 6 a.m. 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) N/A
July 21, 2019, 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
 
July 21, 2019, 4 a.m. 1.7 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 2.0
 
July 21, 2019, 3 a.m. 2.8 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 3.0
 
July 21, 2019, 2 a.m. 2.1 ppb (2) 0.8 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
July 21, 2019, 1 a.m. 4.1 ppb (4) 2.3 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
July 21, 2019, midnight 2.8 ppb (3) 1.3 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
July 20, 2019, 11 p.m. 2.6 ppb (2) 1.3 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
July 20, 2019, 10 p.m. 3.0 ppb (3) 1.5 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
July 20, 2019, 9 p.m. 1.5 ppb (1) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
July 20, 2019, 8 p.m. 1.9 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 16.0 μg/m3 (59) 59.0
 
July 20, 2019, 7 p.m. 5.5 ppb (5) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 20.0 μg/m3 (67) 67.0
 
July 20, 2019, 6 p.m. 8.6 ppb (8) 5.2 ppb (5) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 18.0 μg/m3 (63) 63.0
 
July 20, 2019, 5 p.m. 12.0 ppb (11) 6.6 ppb (6) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
July 20, 2019, 4 p.m. 11.2 ppb (10) 7.6 ppb (7) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
July 20, 2019, 3 p.m. 6.1 ppb (6) 3.5 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
July 20, 2019, 2 p.m. 6.6 ppb (6) 2.9 ppb (3) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
July 20, 2019, 1 p.m. 19.4 ppb (18) 14.6 ppb (14) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
July 20, 2019, noon 9.6 ppb (9) 6.8 ppb (6) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
July 20, 2019, 11 a.m. 2.4 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
July 20, 2019, 10 a.m. 3.1 ppb (3) 1.4 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A -3.0 μg/m3 (0) 3.0
 
July 20, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
July 20, 2019, 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
July 20, 2019, 7 a.m. 0.0 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A N/A N/A
July 20, 2019, 6 a.m. 0.3 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A N/A N/A
July 20, 2019, 5 a.m. 0.7 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -4.0 μg/m3 (0) 1.0
 
July 20, 2019, 4 a.m. 1.0 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 1.0
 
July 20, 2019, 3 a.m. 1.2 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 1.0
 
July 20, 2019, 2 a.m. 1.1 ppb (1) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 1.0
 
July 20, 2019, 1 a.m. 0.8 ppb (1) 0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
July 20, 2019, midnight 3.0 ppb (3) 1.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
July 19, 2019, 11 p.m. 1.8 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
July 19, 2019, 10 p.m. 2.2 ppb (2) 1.3 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
July 19, 2019, 9 p.m. 1.9 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
July 19, 2019, 8 p.m. 3.4 ppb (3) 1.9 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
July 19, 2019, 7 p.m. 3.5 ppb (3) 2.1 ppb (2) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
July 19, 2019, 6 p.m. 3.8 ppb (4) 1.9 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
July 19, 2019, 5 p.m. 7.9 ppb (7) 5.2 ppb (5) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 18.0 μg/m3 (63) 63.0
 
July 19, 2019, 4 p.m. 9.5 ppb (9) 6.4 ppb (6) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 15.0 μg/m3 (56) 56.0
 
July 19, 2019, 3 p.m. 5.5 ppb (5) 3.4 ppb (3) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
July 19, 2019, 2 p.m. 7.0 ppb (6) 4.5 ppb (4) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
July 19, 2019, 1 p.m. 7.6 ppb (7) 4.2 ppb (4) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 7.0
 
July 19, 2019, noon 12.9 ppb (12) 8.9 ppb (8) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A N/A 12.0
 
July 19, 2019, 11 a.m. 1.1 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A N/A 1.0
 
July 19, 2019, 10 a.m. 4.2 ppb (4) 2.2 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A N/A 4.0
 
July 19, 2019, 9 a.m. 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -3.0 μg/m3 (0) N/A
July 19, 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
July 19, 2019, 7 a.m. 0.0 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
July 19, 2019, 6 a.m. 0.0 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
July 19, 2019, 5 a.m. 0.0 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) N/A
July 19, 2019, 4 a.m. 1.0 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 1.0
 
July 19, 2019, 3 a.m. 0.7 ppb (1) 0.3 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 1.0
 
July 19, 2019, 2 a.m. 1.2 ppb (1) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 1.0
 
July 19, 2019, 1 a.m. 2.3 ppb (2) 1.9 ppb (2) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
July 19, 2019, midnight 1.5 ppb (1) 0.9 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
July 18, 2019, 11 p.m. 1.4 ppb (1) 1.0 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
July 18, 2019, 10 p.m. 1.3 ppb (1) 0.8 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
July 18, 2019, 9 p.m. 2.0 ppb (2) 1.3 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
July 18, 2019, 8 p.m. 1.3 ppb (1) 0.9 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
July 18, 2019, 7 p.m. 4.1 ppb (4) 2.5 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
July 18, 2019, 6 p.m. 4.8 ppb (4) 3.3 ppb (3) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
July 18, 2019, 5 p.m. 8.0 ppb (7) 4.8 ppb (4) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 14.0 μg/m3 (54) 54.0
 
July 18, 2019, 4 p.m. 8.8 ppb (8) 5.5 ppb (5) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
July 18, 2019, 3 p.m. 6.4 ppb (6) 3.8 ppb (4) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
July 18, 2019, 2 p.m. 8.0 ppb (7) 5.0 ppb (5) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
July 18, 2019, 1 p.m. 8.9 ppb (8) 4.5 ppb (4) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 8.0
 
July 18, 2019, noon 12.8 ppb (12) 7.4 ppb (7) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A N/A 12.0
 
July 18, 2019, 11 a.m. 0.0 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A N/A N/A
July 18, 2019, 10 a.m. 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) N/A
July 18, 2019, 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 (12) 12.0
 
July 18, 2019, 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 (12) 12.0
 
July 18, 2019, 7 a.m. 0.0 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 1.0 μg/m3 (4) 4.0
 
July 18, 2019, 6 a.m. 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
July 18, 2019, 5 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
 
July 18, 2019, 4 a.m. 0.2 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) N/A
July 18, 2019, 3 a.m. 0.7 ppb (1) 0.3 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 1.0
 
July 18, 2019, 2 a.m. 1.1 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 1.0
 
July 18, 2019, 1 a.m. 1.5 ppb (1) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -3.0 μg/m3 (0) 1.0
 
July 18, 2019, midnight 1.9 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 2.0
 
July 17, 2019, 11 p.m. 2.4 ppb (2) 1.3 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
July 17, 2019, 10 p.m. 1.5 ppb (1) 0.7 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
July 17, 2019, 9 p.m. 2.2 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
July 17, 2019, 8 p.m. 1.8 ppb (2) 0.9 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
July 17, 2019, 7 p.m. 2.6 ppb (2) 1.5 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
July 17, 2019, 6 p.m. 2.7 ppb (3) 1.5 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 17.0 μg/m3 (61) 61.0
 
July 17, 2019, 5 p.m. 11.1 ppb (10) 7.0 ppb (6) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
July 17, 2019, 4 p.m. 4.2 ppb (4) 2.3 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
July 17, 2019, 3 p.m. 1.6 ppb (1) 1.1 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
July 17, 2019, 2 p.m. 3.7 ppb (3) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
July 17, 2019, 1 p.m. 5.7 ppb (5) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
July 17, 2019, noon 8.7 ppb (8) 7.3 ppb (7) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 8.0
 
July 17, 2019, 11 a.m. 0.8 ppb (1) 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 (0) 3.0
 
July 17, 2019, 10 a.m. 1.9 ppb (2) 1.6 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A 0.23 ppb (3) N/A -2.0 μg/m3 (0) 3.0
 
July 17, 2019, 9 a.m. -0.1 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 (0) 2.0
 
July 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 (0) N/A
July 17, 2019, 7 a.m. -0.1 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.31 ppb (3) N/A 1.0 μg/m3 (4) 4.0
 
July 17, 2019, 6 a.m. 0.1 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.27 ppb (3) N/A 1.0 μg/m3 (4) 4.0
 
July 17, 2019, 5 a.m. 0.3 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 0.26 ppb (3) N/A N/A 3.0
 
July 17, 2019, 4 a.m. 1.5 ppb (1) 0.9 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.25 ppb (3) N/A N/A 3.0
 
July 17, 2019, 3 a.m. 2.6 ppb (2) 1.1 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.29 ppb (3) N/A N/A 3.0
 
July 17, 2019, 2 a.m. 2.3 ppb (2) 1.1 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.29 ppb (3) N/A N/A 3.0
 
July 17, 2019, 1 a.m. 2.5 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.32 ppb (4) N/A N/A 4.0
 
July 17, 2019, midnight 4.7 ppb (4) 2.1 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.26 ppb (3) N/A -4.0 μg/m3 (0) 4.0
 
July 16, 2019, 11 p.m. 2.6 ppb (2) 0.9 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 2.0
 
July 16, 2019, 10 p.m. 2.0 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
July 16, 2019, 9 p.m. 3.8 ppb (4) 1.4 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.08 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
July 16, 2019, 8 p.m. 2.9 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A 0.24 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
July 16, 2019, 7 p.m. 3.8 ppb (4) 2.9 ppb (3) N/A 1.0 ppb (1) N/A N/A N/A 0.53 ppb (6) N/A 10.0 μg/m3 (42) 42.0
 
July 16, 2019, 6 p.m. 3.2 ppb (3) 1.7 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.3 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
July 16, 2019, 5 p.m. 4.8 ppb (4) 2.5 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A 0.27 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
July 16, 2019, 4 p.m. 9.8 ppb (9) 4.8 ppb (4) N/A 5.0 ppb (5) N/A N/A N/A 0.28 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
July 16, 2019, 3 p.m. 7.0 ppb (6) 4.5 ppb (4) N/A 2.0 ppb (2) N/A N/A N/A 0.29 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
July 16, 2019, 2 p.m. 4.9 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.27 ppb (3) N/A 1.0 μg/m3 (4) 5.0
 
July 16, 2019, 1 p.m. 4.6 ppb (4) 1.9 ppb (2) N/A 3.0 ppb (3) N/A N/A N/A 0.27 ppb (3) N/A 1.0 μg/m3 (4) 4.0
 
July 16, 2019, noon 2.3 ppb (2) 1.4 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A 0.26 ppb (3) N/A 1.0 μg/m3 (4) 4.0
 
July 16, 2019, 11 a.m. 4.0 ppb (4) 2.9 ppb (3) N/A 1.0 ppb (1) N/A N/A N/A 0.26 ppb (3) N/A -4.0 μg/m3 (0) 4.0
 
July 16, 2019, 10 a.m. 0.0 ppb (0) 0.0 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
 
July 16, 2019, 9 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
July 16, 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
July 16, 2019, 7 a.m. -0.1 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) N/A
July 16, 2019, 6 a.m. 0.2 ppb (0) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) N/A
July 16, 2019, 5 a.m. 0.3 ppb (0) -0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 1.0
 
July 16, 2019, 4 a.m. 0.1 ppb (0) -0.3 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) N/A