AQSQID: 490030003

Site Name: Brigham City

Location: Brigham City, UT

Reporting: True, Located: True

Current AQI: 35.0

Brigham City UT, US: 41.492802, -112.0187

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 22, 2019, 10 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 45.0 ppb (35) N/A N/A 2.1 μg/m3 (9) 35.0
 
March 22, 2019, 9 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 44.0 ppb (34) N/A N/A 3.1 μg/m3 (13) 34.0
 
March 22, 2019, 8 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 43.0 ppb (33) N/A N/A 3.9 μg/m3 (16) 33.0
 
March 22, 2019, 7 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 43.0 ppb (33) N/A N/A 3.2 μg/m3 (13) 33.0
 
March 22, 2019, 6 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 44.0 ppb (34) N/A N/A 2.6 μg/m3 (11) 34.0
 
March 22, 2019, 5 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 42.0 ppb (32) N/A N/A 3.2 μg/m3 (13) 32.0
 
March 22, 2019, 4 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 41.0 ppb (32) N/A N/A 3.7 μg/m3 (15) 32.0
 
March 22, 2019, 3 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A 41.0 ppb (32) N/A N/A 3.2 μg/m3 (13) 32.0
 
March 22, 2019, 2 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A 40.0 ppb (31) N/A N/A 2.8 μg/m3 (12) 31.0
 
March 22, 2019, 1 p.m. 9.0 ppb (8) 1.0 ppb (1) N/A 8.0 ppb (7) N/A N/A 39.0 ppb (30) N/A N/A 3.6 μg/m3 (15) 30.0
 
March 22, 2019, noon 7.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A 40.0 ppb (31) N/A N/A 1.9 μg/m3 (8) 31.0
 
March 22, 2019, 11 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 42.0 ppb (32) N/A N/A 2.3 μg/m3 (10) 32.0
 
March 22, 2019, 10 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 46.0 ppb (35) N/A N/A 2.5 μg/m3 (10) 35.0
 
March 22, 2019, 9 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 49.0 ppb (38) N/A N/A 4.3 μg/m3 (18) 38.0
 
March 22, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 5.2 μg/m3 (22) 22.0
 
March 22, 2019, 7 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 51.0 ppb (39) N/A N/A 7.0 μg/m3 (29) 39.0
 
March 22, 2019, 6 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A 43.0 ppb (33) N/A N/A 4.2 μg/m3 (18) 33.0
 
March 22, 2019, 5 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 42.0 ppb (32) N/A N/A 2.4 μg/m3 (10) 32.0
 
March 22, 2019, 4 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 44.0 ppb (34) N/A N/A 3.0 μg/m3 (12) 34.0
 
March 22, 2019, 3 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A N/A 44.0 ppb (34) N/A N/A 6.8 μg/m3 (28) 34.0
 
March 22, 2019, 2 a.m. 9.0 ppb (8) 1.0 ppb (1) N/A 8.0 ppb (7) N/A N/A 43.0 ppb (33) N/A N/A 8.3 μg/m3 (35) 35.0
 
March 22, 2019, 1 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A 47.0 ppb (36) N/A N/A 7.2 μg/m3 (30) 36.0
 
March 22, 2019, midnight 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 50.0 ppb (38) N/A N/A 6.3 μg/m3 (26) 38.0
 
March 21, 2019, 11 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 52.0 ppb (40) N/A N/A 5.3 μg/m3 (22) 40.0
 
March 21, 2019, 10 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 52.0 ppb (40) N/A N/A 5.2 μg/m3 (22) 40.0
 
March 21, 2019, 9 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 54.0 ppb (42) N/A N/A 6.3 μg/m3 (26) 42.0
 
March 21, 2019, 8 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 52.0 ppb (40) N/A N/A 7.7 μg/m3 (32) 40.0
 
March 21, 2019, 7 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 53.0 ppb (41) N/A N/A 7.2 μg/m3 (30) 41.0
 
March 21, 2019, 6 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 53.0 ppb (41) N/A N/A 8.2 μg/m3 (34) 41.0
 
March 21, 2019, 5 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 46.0 ppb (35) N/A N/A 8.0 μg/m3 (33) 35.0
 
March 21, 2019, 4 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A 47.0 ppb (36) N/A N/A 7.2 μg/m3 (30) 36.0
 
March 21, 2019, 3 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 8.0 ppb (7) N/A N/A 49.0 ppb (38) N/A N/A 6.8 μg/m3 (28) 38.0
 
March 21, 2019, 2 p.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A 53.0 ppb (41) N/A N/A 5.7 μg/m3 (24) 41.0
 
March 21, 2019, 1 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 55.0 ppb (42) N/A N/A 4.4 μg/m3 (18) 42.0
 
March 21, 2019, noon 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 54.0 ppb (42) N/A N/A 3.3 μg/m3 (14) 42.0
 
March 21, 2019, 11 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 55.0 ppb (42) N/A N/A 4.1 μg/m3 (17) 42.0
 
March 21, 2019, 10 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 57.0 ppb (44) N/A N/A 4.1 μg/m3 (17) 44.0
 
March 21, 2019, 9 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 58.0 ppb (45) N/A N/A 4.2 μg/m3 (18) 45.0
 
March 21, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 4.1 μg/m3 (17) 17.0
 
March 21, 2019, 7 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 58.0 ppb (45) N/A N/A 4.2 μg/m3 (18) 45.0
 
March 21, 2019, 6 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 59.0 ppb (45) N/A N/A 4.1 μg/m3 (17) 45.0
 
March 21, 2019, 5 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 61.0 ppb (47) N/A N/A 4.6 μg/m3 (19) 47.0
 
March 21, 2019, 4 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 60.0 ppb (46) N/A N/A 4.0 μg/m3 (17) 46.0
 
March 21, 2019, 3 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 59.0 ppb (45) N/A N/A 3.1 μg/m3 (13) 45.0
 
March 21, 2019, 2 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 59.0 ppb (45) N/A N/A 2.7 μg/m3 (11) 45.0
 
March 21, 2019, 1 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 59.0 ppb (45) N/A N/A 2.9 μg/m3 (12) 45.0
 
March 21, 2019, midnight 3.0 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) N/A N/A 59.0 ppb (45) N/A N/A 3.1 μg/m3 (13) 45.0
 
March 20, 2019, 11 p.m. 3.0 ppb (3) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 61.0 ppb (47) N/A N/A 3.4 μg/m3 (14) 47.0
 
March 20, 2019, 10 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 60.0 ppb (46) N/A N/A 3.1 μg/m3 (13) 46.0
 
March 20, 2019, 9 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 59.0 ppb (45) N/A N/A 3.3 μg/m3 (14) 45.0
 
March 20, 2019, 8 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 58.0 ppb (45) N/A N/A 3.7 μg/m3 (15) 45.0
 
March 20, 2019, 7 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 58.0 ppb (45) N/A N/A 3.4 μg/m3 (14) 45.0
 
March 20, 2019, 6 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 57.0 ppb (44) N/A N/A 4.6 μg/m3 (19) 44.0
 
March 20, 2019, 5 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 55.0 ppb (42) N/A N/A 6.2 μg/m3 (26) 42.0
 
March 20, 2019, 4 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 53.0 ppb (41) N/A N/A 3.5 μg/m3 (15) 41.0
 
March 20, 2019, 3 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 53.0 ppb (41) N/A N/A 4.7 μg/m3 (20) 41.0
 
March 20, 2019, 2 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 55.0 ppb (42) N/A N/A 4.1 μg/m3 (17) 42.0
 
March 20, 2019, 1 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 56.0 ppb (43) N/A N/A 5.6 μg/m3 (23) 43.0
 
March 20, 2019, noon 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 59.0 ppb (45) N/A N/A 4.1 μg/m3 (17) 45.0
 
March 20, 2019, 11 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 57.0 ppb (44) N/A N/A 4.8 μg/m3 (20) 44.0
 
March 20, 2019, 10 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A 57.0 ppb (44) N/A N/A 5.0 μg/m3 (21) 44.0
 
March 20, 2019, 9 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 57.0 ppb (44) N/A N/A 5.0 μg/m3 (21) 44.0
 
March 20, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 4.9 μg/m3 (20) 20.0
 
March 20, 2019, 7 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 57.0 ppb (44) N/A N/A 4.8 μg/m3 (20) 44.0
 
March 20, 2019, 6 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 57.0 ppb (44) N/A N/A 4.0 μg/m3 (17) 44.0
 
March 20, 2019, 5 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 58.0 ppb (45) N/A N/A 2.1 μg/m3 (9) 45.0
 
March 20, 2019, 4 a.m. 1.0 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 58.0 ppb (45) N/A N/A 2.1 μg/m3 (9) 45.0
 
March 20, 2019, 3 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 56.0 ppb (43) N/A N/A 2.1 μg/m3 (9) 43.0
 
March 20, 2019, 2 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 57.0 ppb (44) N/A N/A 2.7 μg/m3 (11) 44.0
 
March 20, 2019, 1 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 55.0 ppb (42) N/A N/A 5.3 μg/m3 (22) 42.0
 
March 20, 2019, midnight 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 55.0 ppb (42) N/A N/A 5.8 μg/m3 (24) 42.0
 
March 19, 2019, 11 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 53.0 ppb (41) N/A N/A 3.7 μg/m3 (15) 41.0
 
March 19, 2019, 10 p.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 53.0 ppb (41) N/A N/A 3.0 μg/m3 (12) 41.0
 
March 19, 2019, 9 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 52.0 ppb (40) N/A N/A 3.0 μg/m3 (12) 40.0
 
March 19, 2019, 8 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 51.0 ppb (39) N/A N/A 2.8 μg/m3 (12) 39.0
 
March 19, 2019, 7 p.m. 3.0 ppb (3) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 51.0 ppb (39) N/A N/A 2.4 μg/m3 (10) 39.0
 
March 19, 2019, 6 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 50.0 ppb (38) N/A N/A 2.4 μg/m3 (10) 38.0
 
March 19, 2019, 5 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 47.0 ppb (36) N/A N/A 6.9 μg/m3 (29) 36.0
 
March 19, 2019, 4 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A 44.0 ppb (34) N/A N/A 6.2 μg/m3 (26) 34.0
 
March 19, 2019, 3 p.m. 11.0 ppb (10) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A 39.0 ppb (30) N/A N/A 6.0 μg/m3 (25) 30.0
 
March 19, 2019, 2 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 46.0 ppb (35) N/A N/A 4.8 μg/m3 (20) 35.0
 
March 19, 2019, 1 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A 41.0 ppb (32) N/A N/A 5.1 μg/m3 (21) 32.0
 
March 19, 2019, noon 24.0 ppb (22) 4.0 ppb (4) N/A 20.0 ppb (19) N/A N/A 18.0 ppb (14) N/A N/A 6.5 μg/m3 (27) 27.0
 
March 19, 2019, 11 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A N/A 31.0 ppb (24) N/A N/A 5.9 μg/m3 (25) 25.0
 
March 19, 2019, 10 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 47.0 ppb (36) N/A N/A 4.2 μg/m3 (18) 36.0
 
March 19, 2019, 9 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 48.0 ppb (37) N/A N/A 4.2 μg/m3 (18) 37.0
 
March 19, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 3.8 μg/m3 (16) 16.0
 
March 19, 2019, 7 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.6 μg/m3 (15) 15.0
 
March 19, 2019, 6 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 3.7 μg/m3 (15) 15.0
 
March 19, 2019, 5 a.m. 2.0 ppb (2) 1.0 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
 
March 19, 2019, 4 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 3.8 μg/m3 (16) 16.0
 
March 19, 2019, 3 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 3.8 μg/m3 (16) 16.0
 
March 19, 2019, 2 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 48.0 ppb (37) N/A N/A 4.0 μg/m3 (17) 37.0
 
March 19, 2019, 1 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 46.0 ppb (35) N/A N/A 3.5 μg/m3 (15) 35.0
 
March 19, 2019, midnight 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 48.0 ppb (37) N/A N/A 2.8 μg/m3 (12) 37.0
 
March 18, 2019, 11 p.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 49.0 ppb (38) N/A N/A 2.7 μg/m3 (11) 38.0
 
March 18, 2019, 10 p.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 49.0 ppb (38) N/A N/A 3.3 μg/m3 (14) 38.0
 
March 18, 2019, 9 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 47.0 ppb (36) N/A N/A 5.5 μg/m3 (23) 36.0
 
March 18, 2019, 8 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 44.0 ppb (34) N/A N/A 8.8 μg/m3 (37) 37.0
 
March 18, 2019, 7 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 45.0 ppb (35) N/A N/A 8.9 μg/m3 (37) 37.0
 
March 18, 2019, 6 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 43.0 ppb (33) N/A N/A 6.9 μg/m3 (29) 33.0
 
March 18, 2019, 5 p.m. 12.0 ppb (11) 4.0 ppb (4) N/A 8.0 ppb (7) N/A N/A 39.0 ppb (30) N/A N/A 10.4 μg/m3 (43) 43.0
 
March 18, 2019, 4 p.m. 14.0 ppb (13) 5.0 ppb (5) N/A 9.0 ppb (8) N/A N/A 37.0 ppb (28) N/A N/A 9.3 μg/m3 (39) 39.0
 
March 18, 2019, 3 p.m. 30.0 ppb (28) 12.0 ppb (11) N/A 18.0 ppb (17) N/A N/A 25.0 ppb (19) N/A N/A 9.5 μg/m3 (40) 40.0
 
March 18, 2019, 2 p.m. 71.0 ppb (68) 36.0 ppb (33) N/A 34.0 ppb (31) N/A N/A 5.0 ppb (4) N/A N/A 9.4 μg/m3 (39) 68.0
 
March 18, 2019, 1 p.m. 30.0 ppb (28) 5.0 ppb (5) N/A 25.0 ppb (23) N/A N/A 15.0 ppb (12) N/A N/A 7.7 μg/m3 (32) 32.0
 
March 18, 2019, noon 29.0 ppb (27) 6.0 ppb (6) N/A 23.0 ppb (21) N/A N/A 15.0 ppb (12) N/A N/A 7.7 μg/m3 (32) 32.0
 
March 18, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A N/A 7.1 μg/m3 (30) 30.0
 
March 18, 2019, 10 a.m. 13.0 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A N/A 24.0 ppb (18) N/A N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 9 a.m. 13.0 ppb (12) 1.0 ppb (1) N/A 13.0 ppb (12) N/A N/A 21.0 ppb (16) N/A N/A 7.1 μg/m3 (30) 30.0
 
March 18, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 7.2 μg/m3 (30) 30.0
 
March 18, 2019, 7 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 44.0 ppb (34) N/A N/A 5.7 μg/m3 (24) 34.0
 
March 18, 2019, 6 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 47.0 ppb (36) N/A N/A 6.0 μg/m3 (25) 36.0
 
March 18, 2019, 5 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 47.0 ppb (36) N/A N/A 6.9 μg/m3 (29) 36.0
 
March 18, 2019, 4 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 47.0 ppb (36) N/A N/A 7.3 μg/m3 (30) 36.0
 
March 18, 2019, 3 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 46.0 ppb (35) N/A N/A 7.9 μg/m3 (33) 35.0
 
March 18, 2019, 2 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A 44.0 ppb (34) N/A N/A 7.4 μg/m3 (31) 34.0
 
March 18, 2019, 1 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A 40.0 ppb (31) N/A N/A 3.0 μg/m3 (12) 31.0
 
March 18, 2019, midnight 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A 47.0 ppb (36) N/A N/A 3.1 μg/m3 (13) 36.0
 
March 17, 2019, 11 p.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 47.0 ppb (36) N/A N/A 4.0 μg/m3 (17) 36.0
 
March 17, 2019, 10 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 50.0 ppb (38) N/A N/A 6.5 μg/m3 (27) 38.0
 
March 17, 2019, 9 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 52.0 ppb (40) N/A N/A 8.3 μg/m3 (35) 40.0
 
March 17, 2019, 8 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 54.0 ppb (42) N/A N/A 13.4 μg/m3 (53) 53.0
 
March 17, 2019, 7 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 49.0 ppb (38) N/A N/A 11.3 μg/m3 (47) 47.0
 
March 17, 2019, 6 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 43.0 ppb (33) N/A N/A 10.1 μg/m3 (42) 42.0
 
March 17, 2019, 5 p.m. 10.0 ppb (9) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A 40.0 ppb (31) N/A N/A 10.1 μg/m3 (42) 42.0
 
March 17, 2019, 4 p.m. 15.0 ppb (14) 6.0 ppb (6) N/A 9.0 ppb (8) N/A N/A 30.0 ppb (23) N/A N/A 9.5 μg/m3 (40) 40.0
 
March 17, 2019, 3 p.m. 20.0 ppb (19) 8.0 ppb (7) N/A 13.0 ppb (12) N/A N/A 25.0 ppb (19) N/A N/A 9.9 μg/m3 (41) 41.0
 
March 17, 2019, 2 p.m. 39.0 ppb (36) 15.0 ppb (14) N/A 24.0 ppb (22) N/A N/A 8.0 ppb (6) N/A N/A 10.4 μg/m3 (43) 43.0
 
March 17, 2019, 1 p.m. 32.0 ppb (30) 6.0 ppb (6) N/A 25.0 ppb (23) N/A N/A 9.0 ppb (7) N/A N/A 8.9 μg/m3 (37) 37.0
 
March 17, 2019, noon 15.0 ppb (14) 1.0 ppb (1) N/A 14.0 ppb (13) N/A N/A 23.0 ppb (18) N/A N/A 9.3 μg/m3 (39) 39.0
 
March 17, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A N/A 10.4 μg/m3 (43) 43.0
 
March 17, 2019, 10 a.m. 11.0 ppb (10) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A 25.0 ppb (19) N/A N/A 9.9 μg/m3 (41) 41.0
 
March 17, 2019, 9 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A 34.0 ppb (26) N/A N/A 9.4 μg/m3 (39) 39.0
 
March 17, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 10.9 μg/m3 (45) 45.0
 
March 17, 2019, 7 a.m. 17.0 ppb (16) 1.0 ppb (1) N/A 16.0 ppb (15) N/A N/A 25.0 ppb (19) N/A N/A 11.3 μg/m3 (47) 47.0
 
March 17, 2019, 6 a.m. 24.0 ppb (22) 1.0 ppb (1) N/A 23.0 ppb (21) N/A N/A 17.0 ppb (13) N/A N/A 13.1 μg/m3 (52) 52.0
 
March 17, 2019, 5 a.m. 9.0 ppb (8) 1.0 ppb (1) N/A 9.0 ppb (8) N/A N/A 36.0 ppb (28) N/A N/A 9.4 μg/m3 (39) 39.0
 
March 17, 2019, 4 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 47.0 ppb (36) N/A N/A 5.3 μg/m3 (22) 36.0
 
March 17, 2019, 3 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A N/A 43.0 ppb (33) N/A N/A 6.7 μg/m3 (28) 33.0
 
March 17, 2019, 2 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A 44.0 ppb (34) N/A N/A 7.6 μg/m3 (32) 34.0
 
March 17, 2019, 1 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A 45.0 ppb (35) N/A N/A 9.5 μg/m3 (40) 40.0
 
March 17, 2019, midnight 4.0 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 50.0 ppb (38) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 16, 2019, 11 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 51.0 ppb (39) N/A N/A 9.7 μg/m3 (40) 40.0
 
March 16, 2019, 10 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 50.0 ppb (38) N/A N/A 9.8 μg/m3 (41) 41.0
 
March 16, 2019, 9 p.m. 6.0 ppb (6) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 48.0 ppb (37) N/A N/A 10.3 μg/m3 (43) 43.0
 
March 16, 2019, 8 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 46.0 ppb (35) N/A N/A 10.9 μg/m3 (45) 45.0
 
March 16, 2019, 7 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 43.0 ppb (33) N/A N/A 9.3 μg/m3 (39) 39.0
 
March 16, 2019, 6 p.m. 8.0 ppb (7) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A 41.0 ppb (32) N/A N/A 8.4 μg/m3 (35) 35.0
 
March 16, 2019, 5 p.m. 10.0 ppb (9) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A 36.0 ppb (28) N/A N/A 9.3 μg/m3 (39) 39.0
 
March 16, 2019, 4 p.m. 13.0 ppb (12) 5.0 ppb (5) N/A 8.0 ppb (7) N/A N/A 31.0 ppb (24) N/A N/A 8.6 μg/m3 (36) 36.0
 
March 16, 2019, 3 p.m. 39.0 ppb (36) 18.0 ppb (17) N/A 21.0 ppb (19) N/A N/A 19.0 ppb (15) N/A N/A 9.1 μg/m3 (38) 38.0
 
March 16, 2019, 2 p.m. 39.0 ppb (36) 13.0 ppb (12) N/A 26.0 ppb (24) N/A N/A 13.0 ppb (10) N/A N/A 9.1 μg/m3 (38) 38.0
 
March 16, 2019, 1 p.m. 24.0 ppb (22) 4.0 ppb (4) N/A 20.0 ppb (19) N/A N/A 19.0 ppb (15) N/A N/A 8.3 μg/m3 (35) 35.0
 
March 16, 2019, noon 19.0 ppb (18) 2.0 ppb (2) N/A 17.0 ppb (16) N/A N/A 24.0 ppb (18) N/A N/A 7.1 μg/m3 (30) 30.0
 
March 16, 2019, 11 a.m. 12.0 ppb (11) 1.0 ppb (1) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 7.5 μg/m3 (31) 31.0
 
March 16, 2019, 10 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A N/A 35.0 ppb (27) N/A N/A 6.4 μg/m3 (27) 27.0
 
March 16, 2019, 9 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A N/A 30.0 ppb (23) N/A N/A 7.1 μg/m3 (30) 30.0
 
March 16, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.5 μg/m3 (27) 27.0
 
March 16, 2019, 7 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 40.0 ppb (31) N/A N/A 6.1 μg/m3 (25) 31.0
 
March 16, 2019, 6 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 45.0 ppb (35) N/A N/A 5.8 μg/m3 (24) 35.0
 
March 16, 2019, 5 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 45.0 ppb (35) N/A N/A 4.9 μg/m3 (20) 35.0
 
March 16, 2019, 4 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 44.0 ppb (34) N/A N/A 6.0 μg/m3 (25) 34.0
 
March 16, 2019, 3 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 43.0 ppb (33) N/A N/A 5.7 μg/m3 (24) 33.0
 
March 16, 2019, 2 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 43.0 ppb (33) N/A N/A 5.6 μg/m3 (23) 33.0
 
March 16, 2019, 1 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 44.0 ppb (34) N/A N/A 5.0 μg/m3 (21) 34.0
 
March 16, 2019, midnight 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 45.0 ppb (35) N/A N/A 7.6 μg/m3 (32) 35.0
 
March 15, 2019, 11 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 44.0 ppb (34) N/A N/A 9.2 μg/m3 (38) 38.0