AQSQID: 300270006

Site Name: Lewistown

Location: Lewistown, MT

Reporting: True, Located: True

Current AQI: 28.0

Lewistown MT, US: 47.048537, -109.455315

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Jan. 24, 2019, midnight N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 29.0 μg/m3 (26) 4.7 μg/m3 (20) 28.0
 
Jan. 23, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 22.0 μg/m3 (20) N/A 28.0
 
Jan. 23, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 10.0 μg/m3 (9) 3.3 μg/m3 (14) 29.0
 
Jan. 23, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 7.0 μg/m3 (6) 5.2 μg/m3 (22) 30.0
 
Jan. 23, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 3.0 μg/m3 (3) -0.4 μg/m3 (0) 31.0
 
Jan. 23, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 3.0 μg/m3 (3) 1.4 μg/m3 (6) 32.0
 
Jan. 23, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 1.9 μg/m3 (8) 8.0
 
Jan. 23, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A N/A N/A 5.0 μg/m3 (5) 0.3 μg/m3 (1) 5.0
 
Jan. 23, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A N/A N/A 9.0 μg/m3 (8) 10.4 μg/m3 (43) 43.0
 
Jan. 23, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A N/A N/A 6.0 μg/m3 (5) 10.1 μg/m3 (42) 42.0
 
Jan. 23, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 5.1 μg/m3 (21) 21.0
 
Jan. 23, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A N/A N/A 0.0 μg/m3 (0) 3.4 μg/m3 (14) 14.0
 
Jan. 23, 2019, noon N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 4.0 μg/m3 (4) 3.4 μg/m3 (14) 30.0
 
Jan. 23, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 0.0 μg/m3 (0) 2.8 μg/m3 (12) 30.0
 
Jan. 23, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 0.0 μg/m3 (0) 3.8 μg/m3 (16) 31.0
 
Jan. 23, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 2.0 μg/m3 (2) -0.7 μg/m3 (0) 30.0
 
Jan. 23, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 5.0 μg/m3 (5) N/A 31.0
 
Jan. 23, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 12.0 μg/m3 (11) 1.0 μg/m3 (4) 32.0
 
Jan. 23, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 1.0 μg/m3 (1) -2.1 μg/m3 (0) 31.0
 
Jan. 23, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 2.0 μg/m3 (2) 4.1 μg/m3 (17) 30.0
 
Jan. 23, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 1.0 μg/m3 (1) 0.2 μg/m3 (1) 32.0
 
Jan. 23, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 2.0 μg/m3 (2) 1.5 μg/m3 (6) 31.0
 
Jan. 23, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 1.0 μg/m3 (1) -1.0 μg/m3 (0) 31.0
 
Jan. 23, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 3.0 μg/m3 (3) 4.2 μg/m3 (18) 31.0
 
Jan. 23, 2019, midnight N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 7.0 μg/m3 (6) 4.9 μg/m3 (20) 30.0
 
Jan. 22, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 7.0 μg/m3 (6) 8.5 μg/m3 (35) 35.0
 
Jan. 22, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 4.0 μg/m3 (4) -1.4 μg/m3 (0) 31.0
 
Jan. 22, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A -2.3 μg/m3 (0) 31.0
 
Jan. 22, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 5.0 μg/m3 (5) 3.7 μg/m3 (15) 31.0
 
Jan. 22, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 4.0 μg/m3 (4) 3.7 μg/m3 (15) 30.0
 
Jan. 22, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 2.0 μg/m3 (2) 6.0 μg/m3 (25) 30.0
 
Jan. 22, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 3.0 μg/m3 (3) 5.1 μg/m3 (21) 28.0
 
Jan. 22, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 2.0 μg/m3 (2) -1.4 μg/m3 (0) 27.0
 
Jan. 22, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 9.0 μg/m3 (8) -4.5 μg/m3 (0) 27.0
 
Jan. 22, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 0.0 μg/m3 (0) 2.1 μg/m3 (9) 25.0
 
Jan. 22, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 4.0 μg/m3 (4) -0.5 μg/m3 (0) 22.0
 
Jan. 22, 2019, noon N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 0.0 μg/m3 (0) 0.9 μg/m3 (4) 30.0
 
Jan. 22, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 2.0 μg/m3 (2) 2.4 μg/m3 (10) 29.0
 
Jan. 22, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 4.0 μg/m3 (4) 3.0 μg/m3 (12) 29.0
 
Jan. 22, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 2.0 μg/m3 (2) 5.1 μg/m3 (21) 29.0
 
Jan. 22, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 10.0 μg/m3 (9) 9.7 μg/m3 (40) 40.0
 
Jan. 22, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 17.0 μg/m3 (15) 10.2 μg/m3 (42) 42.0
 
Jan. 22, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 5.0 μg/m3 (5) 12.2 μg/m3 (50) 50.0
 
Jan. 22, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 10.0 μg/m3 (9) 4.9 μg/m3 (20) 27.0
 
Jan. 22, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 8.0 μg/m3 (7) 5.5 μg/m3 (23) 28.0
 
Jan. 22, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 8.0 μg/m3 (7) 8.2 μg/m3 (34) 34.0
 
Jan. 22, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 10.0 μg/m3 (9) 7.2 μg/m3 (30) 30.0
 
Jan. 22, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 7.0 μg/m3 (6) 8.2 μg/m3 (34) 34.0
 
Jan. 22, 2019, midnight N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 6.0 μg/m3 (5) 5.7 μg/m3 (24) 28.0
 
Jan. 21, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A -4.0 μg/m3 (0) 4.1 μg/m3 (17) 28.0
 
Jan. 21, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 9.0 μg/m3 (8) 6.0 μg/m3 (25) 27.0
 
Jan. 21, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 10.0 μg/m3 (9) 4.7 μg/m3 (20) 26.0
 
Jan. 21, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 6.0 μg/m3 (5) 2.5 μg/m3 (10) 26.0
 
Jan. 21, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 8.0 μg/m3 (7) 2.4 μg/m3 (10) 25.0
 
Jan. 21, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 5.0 μg/m3 (5) 1.7 μg/m3 (7) 25.0
 
Jan. 21, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A 8.0 μg/m3 (7) 4.5 μg/m3 (19) 24.0
 
Jan. 21, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A 15.0 μg/m3 (14) 5.5 μg/m3 (23) 24.0
 
Jan. 21, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A 10.0 μg/m3 (9) -0.2 μg/m3 (0) 24.0
 
Jan. 21, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 1.0 μg/m3 (1) 1.9 μg/m3 (8) 25.0
 
Jan. 21, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 2.0 μg/m3 (2) 2.4 μg/m3 (10) 25.0
 
Jan. 21, 2019, noon N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 2.0 μg/m3 (2) -0.6 μg/m3 (0) 25.0
 
Jan. 21, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 5.0 μg/m3 (5) 3.0 μg/m3 (12) 25.0
 
Jan. 21, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 1.0 μg/m3 (1) -1.3 μg/m3 (0) 22.0
 
Jan. 21, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 1.0 μg/m3 (1) 3.2 μg/m3 (13) 25.0
 
Jan. 21, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A -1.0 μg/m3 (0) 0.0 μg/m3 (0) 26.0
 
Jan. 21, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 0.0 μg/m3 (0) N/A 27.0
 
Jan. 21, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 3.0 μg/m3 (3) 2.2 μg/m3 (9) 27.0
 
Jan. 21, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 2.0 μg/m3 (2) -0.3 μg/m3 (0) 28.0
 
Jan. 21, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A -1.0 μg/m3 (0) 4.0 μg/m3 (17) 28.0
 
Jan. 21, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 2.0 μg/m3 (2) 0.0 μg/m3 (0) 28.0
 
Jan. 21, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 1.0 μg/m3 (1) -0.7 μg/m3 (0) 27.0
 
Jan. 21, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 1.0 μg/m3 (1) 1.5 μg/m3 (6) 27.0
 
Jan. 21, 2019, midnight N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 3.0 μg/m3 (3) -4.1 μg/m3 (0) 27.0
 
Jan. 20, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 0.0 μg/m3 (0) -1.9 μg/m3 (0) 28.0
 
Jan. 20, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 5.0 μg/m3 (5) 0.1 μg/m3 (0) 31.0
 
Jan. 20, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A -1.0 μg/m3 (0) -1.9 μg/m3 (0) 30.0
 
Jan. 20, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A -2.0 μg/m3 (0) -2.1 μg/m3 (0) 29.0
 
Jan. 20, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 0.0 μg/m3 (0) 5.8 μg/m3 (24) 29.0
 
Jan. 20, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 2.0 μg/m3 (2) -4.7 μg/m3 (0) 27.0
 
Jan. 20, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 3.0 μg/m3 (3) 2.4 μg/m3 (10) 25.0
 
Jan. 20, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A -3.0 μg/m3 (0) 3.7 μg/m3 (15) 22.0
 
Jan. 20, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (21) N/A 1.0 μg/m3 (1) 5.5 μg/m3 (23) 23.0
 
Jan. 20, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (22) N/A 2.0 μg/m3 (2) -0.3 μg/m3 (0) 22.0
 
Jan. 20, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (22) N/A 4.0 μg/m3 (4) 0.8 μg/m3 (3) 22.0
 
Jan. 20, 2019, noon N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 3.0 μg/m3 (3) 4.9 μg/m3 (20) 25.0
 
Jan. 20, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 3.0 μg/m3 (3) -1.9 μg/m3 (0) 26.0
 
Jan. 20, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 0.0 μg/m3 (0) 1.7 μg/m3 (7) 25.0
 
Jan. 20, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 2.0 μg/m3 (2) 2.4 μg/m3 (10) 28.0
 
Jan. 20, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 6.0 μg/m3 (5) 6.8 μg/m3 (28) 29.0
 
Jan. 20, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 3.0 μg/m3 (3) 1.6 μg/m3 (7) 29.0
 
Jan. 20, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 3.0 μg/m3 (3) -1.7 μg/m3 (0) 28.0
 
Jan. 20, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 3.0 μg/m3 (3) 0.8 μg/m3 (3) 31.0
 
Jan. 20, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 3.0 μg/m3 (3) 1.3 μg/m3 (5) 32.0
 
Jan. 20, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 2.0 μg/m3 (2) 2.4 μg/m3 (10) 32.0
 
Jan. 20, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 0.0 μg/m3 (0) 2.3 μg/m3 (10) 32.0
 
Jan. 20, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 11.0 μg/m3 (10) 4.1 μg/m3 (17) 28.0
 
Jan. 20, 2019, midnight N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 0.0 μg/m3 (0) -2.8 μg/m3 (0) 26.0
 
Jan. 19, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 6.0 μg/m3 (5) 1.6 μg/m3 (7) 26.0
 
Jan. 19, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 2.0 μg/m3 (2) 1.5 μg/m3 (6) 26.0
 
Jan. 19, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 1.0 μg/m3 (1) 1.3 μg/m3 (5) 26.0
 
Jan. 19, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 1.0 μg/m3 (1) 0.6 μg/m3 (2) 27.0
 
Jan. 19, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 0.0 μg/m3 (0) -0.3 μg/m3 (0) 28.0
 
Jan. 19, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 2.0 μg/m3 (2) 2.7 μg/m3 (11) 29.0
 
Jan. 19, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A 1.1 μg/m3 (5) 31.0
 
Jan. 19, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 7.0 μg/m3 (6) -1.9 μg/m3 (0) 31.0
 
Jan. 19, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 0.0 μg/m3 (0) N/A 30.0
 
Jan. 19, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A -1.0 μg/m3 (0) -0.8 μg/m3 (0) 28.0
 
Jan. 19, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 0.0 μg/m3 (0) -3.8 μg/m3 (0) 27.0
 
Jan. 19, 2019, noon N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 0.0 μg/m3 (0) -2.0 μg/m3 (0) 28.0
 
Jan. 19, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 1.0 μg/m3 (1) 2.4 μg/m3 (10) 30.0
 
Jan. 19, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 0.0 μg/m3 (0) 0.0 μg/m3 (0) 27.0
 
Jan. 19, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 1.0 μg/m3 (1) 1.6 μg/m3 (7) 28.0
 
Jan. 19, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 0.0 μg/m3 (0) -1.7 μg/m3 (0) 26.0
 
Jan. 19, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 0.0 μg/m3 (0) N/A 26.0
 
Jan. 19, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 2.0 μg/m3 (2) -1.8 μg/m3 (0) 26.0
 
Jan. 19, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 1.0 μg/m3 (1) 3.6 μg/m3 (15) 28.0
 
Jan. 19, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 1.0 μg/m3 (1) 3.5 μg/m3 (15) 27.0
 
Jan. 19, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 1.0 μg/m3 (1) 4.6 μg/m3 (19) 27.0
 
Jan. 19, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 6.0 μg/m3 (5) 4.3 μg/m3 (18) 18.0
 
Jan. 19, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 12.0 μg/m3 (11) 5.4 μg/m3 (23) 23.0
 
Jan. 19, 2019, midnight N/A N/A N/A N/A N/A N/A 10.0 ppb (8) N/A 7.0 μg/m3 (6) 9.3 μg/m3 (39) 39.0
 
Jan. 18, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 4.0 μg/m3 (4) 15.1 μg/m3 (57) 57.0
 
Jan. 18, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 6.0 μg/m3 (5) 3.6 μg/m3 (15) 15.0
 
Jan. 18, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 7.0 μg/m3 (6) 5.6 μg/m3 (23) 23.0
 
Jan. 18, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 4.0 μg/m3 (4) 6.9 μg/m3 (29) 29.0
 
Jan. 18, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 6.0 μg/m3 (5) 6.5 μg/m3 (27) 27.0
 
Jan. 18, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 3.0 μg/m3 (3) 7.2 μg/m3 (30) 30.0
 
Jan. 18, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 11.0 μg/m3 (10) 7.8 μg/m3 (32) 32.0
 
Jan. 18, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 18.0 μg/m3 (16) 19.5 μg/m3 (66) 66.0
 
Jan. 18, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 27.0 μg/m3 (25) 29.5 μg/m3 (87) 87.0
 
Jan. 18, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 14.0 ppb (11) N/A 6.0 μg/m3 (5) 9.1 μg/m3 (38) 38.0
 
Jan. 18, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A 4.0 μg/m3 (4) 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2019, noon N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 8.0 μg/m3 (7) 7.0 μg/m3 (29) 29.0
 
Jan. 18, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A 8.0 μg/m3 (7) 5.1 μg/m3 (21) 21.0
 
Jan. 18, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 9.0 μg/m3 (8) 4.6 μg/m3 (19) 19.0
 
Jan. 18, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 9.0 μg/m3 (8) 4.2 μg/m3 (18) 18.0
 
Jan. 18, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 10.0 μg/m3 (9) 15.9 μg/m3 (58) 58.0
 
Jan. 18, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 10.0 μg/m3 (9) 10.8 μg/m3 (45) 45.0
 
Jan. 18, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 13.0 μg/m3 (12) 3.2 μg/m3 (13) 14.0
 
Jan. 18, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 13.0 μg/m3 (12) 2.1 μg/m3 (9) 14.0
 
Jan. 18, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 5.0 μg/m3 (5) 1.4 μg/m3 (6) 15.0
 
Jan. 18, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A 1.0 μg/m3 (1) 2.5 μg/m3 (10) 15.0
 
Jan. 18, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A 3.0 μg/m3 (3) 0.6 μg/m3 (2) 15.0
 
Jan. 18, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A 4.0 μg/m3 (4) -0.4 μg/m3 (0) 16.0
 
Jan. 18, 2019, midnight N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A 3.0 μg/m3 (3) 0.7 μg/m3 (3) 16.0
 
Jan. 17, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A 11.0 μg/m3 (10) N/A 15.0
 
Jan. 17, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 14.0 μg/m3 (13) 3.3 μg/m3 (14) 15.0
 
Jan. 17, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 9.0 μg/m3 (8) 3.4 μg/m3 (14) 14.0
 
Jan. 17, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 7.0 μg/m3 (6) -0.9 μg/m3 (0) 14.0
 
Jan. 17, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 4.0 μg/m3 (4) 2.0 μg/m3 (8) 14.0
 
Jan. 17, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 1.0 μg/m3 (1) 2.2 μg/m3 (9) 15.0
 
Jan. 17, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 5.0 μg/m3 (5) -1.3 μg/m3 (0) 15.0
 
Jan. 17, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 7.0 μg/m3 (6) 5.6 μg/m3 (23) 23.0
 
Jan. 17, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 3.0 μg/m3 (3) N/A 15.0
 
Jan. 17, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A 2.0 μg/m3 (2) 1.1 μg/m3 (5) 15.0
 
Jan. 17, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A 2.0 μg/m3 (2) 2.5 μg/m3 (10) 17.0
 
Jan. 17, 2019, noon N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A 3.0 μg/m3 (3) 0.2 μg/m3 (1) 18.0
 
Jan. 17, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A 2.0 μg/m3 (2) 5.3 μg/m3 (22) 22.0
 
Jan. 17, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A 3.0 μg/m3 (3) 9.7 μg/m3 (40) 40.0
 
Jan. 17, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 6.0 μg/m3 (5) 2.4 μg/m3 (10) 14.0
 
Jan. 17, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 9.0 μg/m3 (8) -0.6 μg/m3 (0) 14.0
 
Jan. 17, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A 20.0 μg/m3 (18) 2.6 μg/m3 (11) 18.0
 
Jan. 17, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A 25.0 μg/m3 (23) 5.6 μg/m3 (23) 23.0
 
Jan. 17, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 14.0 μg/m3 (13) 6.3 μg/m3 (26) 26.0
 
Jan. 17, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 11.0 μg/m3 (10) 3.1 μg/m3 (13) 14.0
 
Jan. 17, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 25.0 μg/m3 (23) 0.6 μg/m3 (2) 23.0
 
Jan. 17, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (22) N/A 37.0 μg/m3 (34) 9.5 μg/m3 (40) 40.0
 
Jan. 17, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A 51.0 μg/m3 (46) 7.4 μg/m3 (31) 46.0