AQSQID: 300270006

Site Name: Lewistown

Location: Lewistown, MT

Reporting: True, Located: True

Current AQI: 35.0

Lewistown MT, US: 47.048537, -109.455315

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 26, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 18.0 μg/m3 (16) 8.4 μg/m3 (35) 35.0
 
March 26, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 15.0 μg/m3 (14) 10.0 μg/m3 (42) 42.0
 
March 26, 2019, noon N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 8.0 μg/m3 (7) 5.4 μg/m3 (23) 28.0
 
March 26, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 5.0 μg/m3 (5) 2.1 μg/m3 (9) 27.0
 
March 26, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 9.0 μg/m3 (8) 4.4 μg/m3 (18) 28.0
 
March 26, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 2.0 μg/m3 (2) 1.7 μg/m3 (7) 27.0
 
March 26, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 6.0 μg/m3 (5) -3.6 μg/m3 (0) 25.0
 
March 26, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 6.0 μg/m3 (5) N/A 27.0
 
March 26, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 4.0 μg/m3 (4) 6.1 μg/m3 (25) 27.0
 
March 26, 2019, 5 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) 0.7 μg/m3 (3) 28.0
 
March 26, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 2.0 μg/m3 (2) N/A 33.0
 
March 26, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 2.0 μg/m3 (2) 3.3 μg/m3 (14) 34.0
 
March 26, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 5.0 μg/m3 (5) -1.8 μg/m3 (0) 34.0
 
March 26, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 8.0 μg/m3 (7) -2.6 μg/m3 (0) 33.0
 
March 26, 2019, midnight N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 10.0 μg/m3 (9) 7.1 μg/m3 (30) 33.0
 
March 25, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 8.0 μg/m3 (7) -0.2 μg/m3 (0) 34.0
 
March 25, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 7.0 μg/m3 (6) 0.5 μg/m3 (2) 34.0
 
March 25, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 5.0 μg/m3 (5) -0.1 μg/m3 (0) 34.0
 
March 25, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 0.0 μg/m3 (0) 0.9 μg/m3 (4) 35.0
 
March 25, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 5.0 μg/m3 (5) -0.4 μg/m3 (0) 32.0
 
March 25, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 1.0 μg/m3 (1) -0.8 μg/m3 (0) 28.0
 
March 25, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 0.0 μg/m3 (0) 18.6 μg/m3 (64) 64.0
 
March 25, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A -1.0 μg/m3 (0) 16.3 μg/m3 (59) 59.0
 
March 25, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A 11.0 μg/m3 (10) 12.8 μg/m3 (52) 52.0
 
March 25, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 4.0 μg/m3 (4) -0.9 μg/m3 (0) 13.0
 
March 25, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 2.0 μg/m3 (2) -1.1 μg/m3 (0) 15.0
 
March 25, 2019, noon N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 0.0 μg/m3 (0) N/A 15.0
 
March 25, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 4.0 μg/m3 (4) 5.3 μg/m3 (22) 22.0
 
March 25, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 5.0 μg/m3 (5) N/A 14.0
 
March 25, 2019, 9 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) 8.7 μg/m3 (36) 36.0
 
March 25, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 13.0 ppb (10) N/A 11.0 μg/m3 (10) 4.7 μg/m3 (20) 20.0
 
March 25, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 14.0 ppb (11) N/A 19.0 μg/m3 (17) N/A 17.0
 
March 25, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 2.0 μg/m3 (2) 2.2 μg/m3 (9) 15.0
 
March 25, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A 5.0 μg/m3 (5) 7.7 μg/m3 (32) 32.0
 
March 25, 2019, 4 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) 1.7 μg/m3 (7) 16.0
 
March 25, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A 0.0 μg/m3 (0) 5.2 μg/m3 (22) 22.0
 
March 25, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A 6.0 μg/m3 (5) 3.2 μg/m3 (13) 18.0
 
March 25, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 8.0 μg/m3 (7) 5.9 μg/m3 (25) 25.0
 
March 25, 2019, midnight N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A 8.0 μg/m3 (7) 9.9 μg/m3 (41) 41.0
 
March 24, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 5.0 μg/m3 (5) 8.9 μg/m3 (37) 37.0
 
March 24, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 15.0 μg/m3 (14) 5.1 μg/m3 (21) 21.0
 
March 24, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 17.0 μg/m3 (15) 15.6 μg/m3 (58) 58.0
 
March 24, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A 10.0 μg/m3 (9) 5.5 μg/m3 (23) 27.0
 
March 24, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 9.0 μg/m3 (8) 4.1 μg/m3 (17) 30.0
 
March 24, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 11.0 μg/m3 (10) 4.6 μg/m3 (19) 31.0
 
March 24, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 10.0 μg/m3 (9) 7.2 μg/m3 (30) 33.0
 
March 24, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 5.0 μg/m3 (5) 0.0 μg/m3 (0) 33.0
 
March 24, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 5.0 μg/m3 (5) -1.9 μg/m3 (0) 32.0
 
March 24, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 3.0 μg/m3 (3) 6.9 μg/m3 (29) 29.0
 
March 24, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 5.0 μg/m3 (5) 4.1 μg/m3 (17) 29.0
 
March 24, 2019, noon N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 4.0 μg/m3 (4) 7.9 μg/m3 (33) 33.0
 
March 24, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 5.0 μg/m3 (5) 3.2 μg/m3 (13) 28.0
 
March 24, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 8.0 μg/m3 (7) 2.9 μg/m3 (12) 29.0
 
March 24, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 6.0 μg/m3 (5) 7.4 μg/m3 (31) 31.0
 
March 24, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 6.0 μg/m3 (5) 12.3 μg/m3 (51) 51.0
 
March 24, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 6.0 μg/m3 (5) 10.1 μg/m3 (42) 42.0
 
March 24, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 6.0 μg/m3 (5) 0.3 μg/m3 (1) 31.0
 
March 24, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 8.0 μg/m3 (7) 4.0 μg/m3 (17) 32.0
 
March 24, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 12.0 μg/m3 (11) 2.4 μg/m3 (10) 32.0
 
March 24, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 17.0 μg/m3 (15) 7.3 μg/m3 (30) 34.0
 
March 24, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 20.0 μg/m3 (18) 0.2 μg/m3 (1) 35.0
 
March 24, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 21.0 μg/m3 (19) 2.6 μg/m3 (11) 35.0
 
March 24, 2019, midnight N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A 4.0 μg/m3 (4) 10.8 μg/m3 (45) 45.0
 
March 23, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 9.7 μg/m3 (40) 40.0
 
March 23, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 15.0 μg/m3 (14) 0.3 μg/m3 (1) 37.0
 
March 23, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A 14.0 μg/m3 (13) 1.8 μg/m3 (8) 38.0
 
March 23, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A 10.0 μg/m3 (9) 7.6 μg/m3 (32) 38.0
 
March 23, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 9.0 μg/m3 (8) 5.5 μg/m3 (23) 39.0
 
March 23, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A 12.0 μg/m3 (11) 1.3 μg/m3 (5) 38.0
 
March 23, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 7.0 μg/m3 (6) 8.5 μg/m3 (35) 37.0
 
March 23, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 13.0 μg/m3 (12) 11.5 μg/m3 (48) 48.0
 
March 23, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 4.0 μg/m3 (4) 8.2 μg/m3 (34) 35.0
 
March 23, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 2.0 μg/m3 (2) 5.0 μg/m3 (21) 35.0
 
March 23, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 4.0 μg/m3 (4) 2.6 μg/m3 (11) 34.0
 
March 23, 2019, noon N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 5.0 μg/m3 (5) 5.8 μg/m3 (24) 32.0
 
March 23, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 5.0 μg/m3 (5) 5.1 μg/m3 (21) 34.0
 
March 23, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 1.0 μg/m3 (1) 3.8 μg/m3 (16) 33.0
 
March 23, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 9.0 μg/m3 (8) -1.8 μg/m3 (0) 32.0
 
March 23, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 6.0 μg/m3 (5) N/A 32.0
 
March 23, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 12.0 μg/m3 (11) N/A 32.0
 
March 23, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 4.0 μg/m3 (4) 1.5 μg/m3 (6) 32.0
 
March 23, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 11.0 μg/m3 (10) 2.8 μg/m3 (12) 31.0
 
March 23, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 16.0 μg/m3 (15) 5.2 μg/m3 (22) 32.0
 
March 23, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 19.0 μg/m3 (17) 4.5 μg/m3 (19) 32.0
 
March 23, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 19.0 μg/m3 (17) 0.6 μg/m3 (2) 35.0
 
March 23, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A 29.0 μg/m3 (26) 4.6 μg/m3 (19) 38.0
 
March 23, 2019, midnight N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A 31.0 μg/m3 (28) 9.6 μg/m3 (40) 40.0
 
March 22, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A 43.0 μg/m3 (39) 10.1 μg/m3 (42) 42.0
 
March 22, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A 23.0 μg/m3 (21) 4.0 μg/m3 (17) 38.0
 
March 22, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A N/A N/A 16.0 μg/m3 (15) 4.6 μg/m3 (19) 19.0
 
March 22, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A N/A N/A 9.0 μg/m3 (8) 6.0 μg/m3 (25) 25.0
 
March 22, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A N/A N/A 16.0 μg/m3 (15) 7.9 μg/m3 (33) 33.0
 
March 22, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 20.0 μg/m3 (18) 1.3 μg/m3 (5) 39.0
 
March 22, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 15.0 μg/m3 (14) 7.3 μg/m3 (30) 37.0
 
March 22, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 14.0 μg/m3 (13) 20.1 μg/m3 (67) 67.0
 
March 22, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 15.0 μg/m3 (14) 18.5 μg/m3 (64) 64.0
 
March 22, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 2.0 μg/m3 (2) 4.0 μg/m3 (17) 34.0
 
March 22, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 2.0 μg/m3 (2) 4.5 μg/m3 (19) 33.0
 
March 22, 2019, noon N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 3.0 μg/m3 (3) -1.8 μg/m3 (0) 33.0
 
March 22, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 6.0 μg/m3 (5) -2.2 μg/m3 (0) 33.0
 
March 22, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 5.0 μg/m3 (5) 4.0 μg/m3 (17) 32.0
 
March 22, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 3.0 μg/m3 (3) 4.4 μg/m3 (18) 33.0
 
March 22, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 5.0 μg/m3 (5) 7.8 μg/m3 (32) 35.0
 
March 22, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 4.0 μg/m3 (4) 8.8 μg/m3 (37) 37.0
 
March 22, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 5.0 μg/m3 (5) 3.2 μg/m3 (13) 37.0
 
March 22, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A 6.0 μg/m3 (5) 1.6 μg/m3 (7) 38.0
 
March 22, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 6.0 μg/m3 (5) 3.7 μg/m3 (15) 37.0
 
March 22, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 4.0 μg/m3 (4) 4.5 μg/m3 (19) 37.0
 
March 22, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 13.0 μg/m3 (12) 3.1 μg/m3 (13) 36.0
 
March 22, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 19.0 μg/m3 (17) 0.0 μg/m3 (0) 36.0
 
March 22, 2019, midnight N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 27.0 μg/m3 (25) 11.7 μg/m3 (49) 49.0
 
March 21, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 22.0 μg/m3 (20) 17.7 μg/m3 (62) 62.0
 
March 21, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A 17.0 μg/m3 (15) -2.1 μg/m3 (0) 40.0
 
March 21, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A 23.0 μg/m3 (21) 7.9 μg/m3 (33) 41.0
 
March 21, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A 22.0 μg/m3 (20) 0.0 μg/m3 (0) 40.0
 
March 21, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 30.0 μg/m3 (27) 6.9 μg/m3 (29) 35.0
 
March 21, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 24.0 μg/m3 (22) 7.4 μg/m3 (31) 35.0
 
March 21, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 5.0 μg/m3 (5) 10.8 μg/m3 (45) 45.0
 
March 21, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 10.0 μg/m3 (9) 9.2 μg/m3 (38) 38.0
 
March 21, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 7.0 μg/m3 (6) 1.1 μg/m3 (5) 32.0
 
March 21, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 5.0 μg/m3 (5) 5.9 μg/m3 (25) 32.0
 
March 21, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 6.0 μg/m3 (5) 3.2 μg/m3 (13) 32.0
 
March 21, 2019, noon N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 4.0 μg/m3 (4) 0.2 μg/m3 (1) 31.0
 
March 21, 2019, 11 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) 0.3 μg/m3 (1) 31.0
 
March 21, 2019, 10 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) 3.9 μg/m3 (16) 31.0
 
March 21, 2019, 9 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) 0.2 μg/m3 (1) 31.0
 
March 21, 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) 6.5 μg/m3 (27) 31.0
 
March 21, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 11.0 μg/m3 (10) 7.3 μg/m3 (30) 30.0
 
March 21, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 6.0 μg/m3 (5) 0.9 μg/m3 (4) 30.0
 
March 21, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 5.0 μg/m3 (5) -4.5 μg/m3 (0) 29.0
 
March 21, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 7.0 μg/m3 (6) 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 13.0 μg/m3 (12) -1.8 μg/m3 (0) 29.0
 
March 21, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 30.0 μg/m3 (27) -0.4 μg/m3 (0) 31.0
 
March 21, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 36.0 μg/m3 (33) 4.9 μg/m3 (20) 34.0
 
March 21, 2019, midnight N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A 32.0 μg/m3 (29) 6.6 μg/m3 (28) 37.0
 
March 20, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A 22.0 μg/m3 (20) 2.8 μg/m3 (12) 40.0
 
March 20, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A 19.0 μg/m3 (17) 4.4 μg/m3 (18) 40.0
 
March 20, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A 19.0 μg/m3 (17) 10.1 μg/m3 (42) 42.0
 
March 20, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A 22.0 μg/m3 (20) 5.2 μg/m3 (22) 40.0
 
March 20, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A 37.0 μg/m3 (34) 3.3 μg/m3 (14) 38.0
 
March 20, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 55.0 μg/m3 (50) 8.8 μg/m3 (37) 50.0
 
March 20, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 14.0 μg/m3 (13) 6.9 μg/m3 (29) 32.0
 
March 20, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 0.0 μg/m3 (0) 0.2 μg/m3 (1) 35.0
 
March 20, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A -3.0 μg/m3 (0) N/A 31.0
 
March 20, 2019, 2 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) 6.4 μg/m3 (27) 30.0
 
March 20, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A 6.0 μg/m3 (5) 1.4 μg/m3 (6) 30.0
 
March 20, 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) 2.8 μg/m3 (12) 30.0
 
March 20, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 0.0 μg/m3 (0) 2.2 μg/m3 (9) 29.0
 
March 20, 2019, 10 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) -2.1 μg/m3 (0) 32.0
 
March 20, 2019, 9 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) 5.0 μg/m3 (21) 32.0
 
March 20, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 2.0 μg/m3 (2) 14.8 μg/m3 (56) 56.0
 
March 20, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A -4.0 μg/m3 (0) 16.8 μg/m3 (60) 60.0
 
March 20, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 2.0 μg/m3 (2) -0.6 μg/m3 (0) 39.0
 
March 20, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A 7.0 μg/m3 (6) 3.2 μg/m3 (13) 42.0
 
March 20, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A 2.0 μg/m3 (2) 1.0 μg/m3 (4) 42.0
 
March 20, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A 14.0 μg/m3 (13) 0.2 μg/m3 (1) 42.0
 
March 20, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 59.0 ppb (45) N/A 12.0 μg/m3 (11) -1.0 μg/m3 (0) 45.0
 
March 20, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A 17.0 μg/m3 (15) 4.5 μg/m3 (19) 49.0
 
March 20, 2019, midnight N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A 20.0 μg/m3 (18) N/A 49.0
 
March 19, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A 8.0 μg/m3 (7) -3.6 μg/m3 (0) 49.0
 
March 19, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A 6.0 μg/m3 (5) 3.2 μg/m3 (13) 49.0
 
March 19, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 65.0 ppb (50) N/A 6.0 μg/m3 (5) 4.0 μg/m3 (17) 50.0
 
March 19, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A 5.0 μg/m3 (5) -0.8 μg/m3 (0) 49.0
 
March 19, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A 8.0 μg/m3 (7) 5.7 μg/m3 (24) 49.0
 
March 19, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 63.0 ppb (48) N/A 15.0 μg/m3 (14) 8.9 μg/m3 (37) 48.0
 
March 19, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A 23.0 μg/m3 (21) 13.1 μg/m3 (52) 52.0
 
March 19, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 62.0 ppb (48) N/A 16.0 μg/m3 (15) 12.9 μg/m3 (52) 52.0
 
March 19, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A 18.0 μg/m3 (16) 3.5 μg/m3 (15) 43.0