ID: 2833

AQSQID: 560391013

Site Name: Yellowstone- Old Faithful Snow Lodge

Added: April 21, 2020, 6:24 p.m.

Updated: April 10, 2021, 5:42 p.m.

Location: Yellowstone National Park (82190), WY

Reporting: True, Located: True

Current AQI: 13.0

Yellowstone National Park (82190) WY, US: 44.373056, -110.830833

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
April 10, 2021, 4 p.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 10, 2021, 3 p.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 10, 2021, 2 p.m. 5.0 ppb (5) 2.0 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
 
April 10, 2021, 1 p.m. 0.4 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
 
April 10, 2021, noon N/A N/A N/A N/A N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 10, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 10, 2021, 10 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 10, 2021, 9 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 10, 2021, 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 (5) 5.0
 
April 10, 2021, 7 a.m. 0.0 ppb (0) -0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 10, 2021, 6 a.m. 0.2 ppb (1) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 10, 2021, 5 a.m. 0.3 ppb (1) -0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 10, 2021, 4 a.m. 0.3 ppb (1) -0.5 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 1.0
 
April 10, 2021, 3 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 10, 2021, 2 a.m. 0.3 ppb (1) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 10, 2021, 1 a.m. 0.0 ppb (0) -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
 
April 10, 2021, midnight 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 0.0
April 9, 2021, 11 p.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 0.0
April 9, 2021, 10 p.m. 0.1 ppb (1) -0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 9, 2021, 9 p.m. 0.1 ppb (1) -0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 9, 2021, 8 p.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 9, 2021, 7 p.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 9, 2021, 6 p.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 0.0
April 9, 2021, 5 p.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 0.0
April 9, 2021, 4 p.m. 0.0 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) 0.0
April 9, 2021, 3 p.m. 0.8 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A N/A 1.0
 
April 9, 2021, 2 p.m. 1.1 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 2.0
 
April 9, 2021, 1 p.m. 0.0 ppb (0) -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) 0.0
April 9, 2021, noon 1.5 ppb (2) -0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A -3.0 μg/m3 (0) 2.0
 
April 9, 2021, 11 a.m. -0.4 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 0.0
April 9, 2021, 10 a.m. -0.3 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 0.0
April 9, 2021, 9 a.m. -0.3 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 0.0
April 9, 2021, 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) 0.0
April 9, 2021, 7 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 0.0
April 9, 2021, 6 a.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 9, 2021, 5 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 0.0
April 9, 2021, 4 a.m. -0.3 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 0.0
April 9, 2021, 3 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 (5) 5.0
 
April 9, 2021, 2 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -1.0 μg/m3 (0) 0.0
April 9, 2021, 1 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 0.0
April 9, 2021, midnight 0.2 ppb (1) -0.1 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 8, 2021, 11 p.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 8, 2021, 10 p.m. 0.1 ppb (1) -0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 8, 2021, 9 p.m. 0.3 ppb (1) -0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 8, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 8, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 8, 2021, 6 p.m. 0.1 ppb (1) -0.2 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
 
April 8, 2021, 5 p.m. 0.4 ppb (1) -0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 8, 2021, 4 p.m. 0.1 ppb (1) -0.3 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 8, 2021, 3 p.m. 0.3 ppb (1) -0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 8, 2021, 2 p.m. 0.1 ppb (1) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 8, 2021, 1 p.m. 0.7 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 8, 2021, noon 0.9 ppb (1) -0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 8, 2021, 11 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 8, 2021, 10 a.m. 0.8 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 8, 2021, 9 a.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 8, 2021, 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 (9) 9.0
 
April 8, 2021, 7 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 8, 2021, 6 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 8, 2021, 5 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 8, 2021, 4 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 8, 2021, 3 a.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 8, 2021, 2 a.m. 0.1 ppb (1) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 8, 2021, 1 a.m. 0.2 ppb (1) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 8, 2021, midnight 0.4 ppb (1) -0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 7, 2021, 11 p.m. 0.5 ppb (1) -0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 7, 2021, 10 p.m. 0.3 ppb (1) -0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 7, 2021, 9 p.m. 0.2 ppb (1) -0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 7, 2021, 8 p.m. 0.4 ppb (1) -0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 7, 2021, 7 p.m. 0.9 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 7, 2021, 6 p.m. 0.4 ppb (1) -0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 7, 2021, 5 p.m. 0.8 ppb (1) -0.1 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 7, 2021, 4 p.m. 0.9 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 7, 2021, 3 p.m. 3.0 ppb (3) 0.8 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 7, 2021, 2 p.m. 2.8 ppb (3) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 7, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 7, 2021, noon 1.4 ppb (2) 0.4 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 7, 2021, 11 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 7, 2021, 10 a.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 7, 2021, 9 a.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 7, 2021, 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 (17) 17.0
 
April 7, 2021, 7 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 7, 2021, 6 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 7, 2021, 5 a.m. 0.0 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 7, 2021, 4 a.m. 0.1 ppb (1) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 7, 2021, 3 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 7, 2021, 2 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 0.0
April 7, 2021, 1 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 0.0
April 7, 2021, midnight -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 6, 2021, 11 p.m. 0.4 ppb (1) -0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 6, 2021, 10 p.m. 0.1 ppb (1) -0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 6, 2021, 9 p.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 6, 2021, 8 p.m. 0.1 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
 
April 6, 2021, 7 p.m. 0.1 ppb (1) -0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 1.0
 
April 6, 2021, 6 p.m. 1.8 ppb (2) 0.3 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 2.0
 
April 6, 2021, 5 p.m. 1.7 ppb (2) 0.3 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 6, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 6, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -2.0 μg/m3 (0) 0.0
April 6, 2021, 2 p.m. 4.7 ppb (5) 1.6 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
 
April 6, 2021, 1 p.m. 0.0 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 (5) 5.0
 
April 6, 2021, noon -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 6, 2021, 11 a.m. -0.1 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 6, 2021, 10 a.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 0.0
April 6, 2021, 9 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A N/A 0.0
April 6, 2021, 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
April 6, 2021, 7 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 6, 2021, 6 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 (5) 5.0
 
April 6, 2021, 5 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 4.0 μg/m3 (17) 17.0
 
April 6, 2021, 4 a.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 6, 2021, 3 a.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 6, 2021, 2 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 6, 2021, 1 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 6, 2021, midnight -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 5, 2021, 11 p.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 5, 2021, 10 p.m. 0.2 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 (13) 13.0
 
April 5, 2021, 9 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
 
April 5, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 5, 2021, 7 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
 
April 5, 2021, 6 p.m. 10.1 ppb (10) 4.4 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 5, 2021, 5 p.m. 6.4 ppb (7) 2.5 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
 
April 5, 2021, 4 p.m. 1.7 ppb (2) 0.4 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
 
April 5, 2021, 3 p.m. 4.7 ppb (5) 1.2 ppb (2) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 5, 2021, 2 p.m. 1.3 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 5, 2021, 1 p.m. 7.1 ppb (7) 1.5 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 5, 2021, noon 0.0 ppb (0) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 5, 2021, 11 a.m. -0.3 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 5, 2021, 10 a.m. -0.3 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 5, 2021, 9 a.m. -0.2 ppb (0) -0.2 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 5, 2021, 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 (13) 13.0
 
April 5, 2021, 7 a.m. -0.3 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 5, 2021, 6 a.m. -0.3 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 5, 2021, 5 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 5, 2021, 4 a.m. -0.1 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 5, 2021, 3 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 5, 2021, 2 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 0.0
April 5, 2021, 1 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 0.0
April 5, 2021, midnight 1.9 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 4, 2021, 11 p.m. 14.9 ppb (15) 5.7 ppb (6) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 15.0
 
April 4, 2021, 10 p.m. 15.4 ppb (15) 5.7 ppb (6) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 15.0
 
April 4, 2021, 9 p.m. 13.6 ppb (13) 5.3 ppb (5) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 13.0
 
April 4, 2021, 8 p.m. 10.7 ppb (11) 4.2 ppb (4) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 11.0
 
April 4, 2021, 7 p.m. 3.5 ppb (4) 1.1 ppb (2) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A N/A 4.0
 
April 4, 2021, 6 p.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 4, 2021, 5 p.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 4, 2021, 4 p.m. 0.1 ppb (1) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 4, 2021, 3 p.m. 1.6 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 4, 2021, 2 p.m. 0.5 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 4, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 4, 2021, noon -0.1 ppb (0) -0.3 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 4, 2021, 11 a.m. -0.3 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 4, 2021, 10 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 4, 2021, 9 a.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 4, 2021, 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 (17) 17.0
 
April 4, 2021, 7 a.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 4, 2021, 6 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 3.0 μg/m3 (13) 13.0
 
April 4, 2021, 5 a.m. 0.1 ppb (1) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 4, 2021, 4 a.m. 0.5 ppb (1) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 4, 2021, 3 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 4, 2021, 2 a.m. 0.0 ppb (0) -0.4 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 4, 2021, 1 a.m. 0.0 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 4, 2021, midnight 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 3, 2021, 11 p.m. 0.4 ppb (1) 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 3, 2021, 10 p.m. 1.4 ppb (2) 0.2 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 3, 2021, 9 p.m. -0.2 ppb (0) -0.5 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 3, 2021, 8 p.m. 0.5 ppb (1) -0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 5.0
 
April 3, 2021, 7 p.m. -0.1 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 3, 2021, 6 p.m. -0.2 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 3, 2021, 5 p.m. 0.0 ppb (0) -0.4 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0