AQSQID: 300490004

Site Name: Ncore

Location: Helena (Hilger Rd), MT

Reporting: True, Located: True

Current AQI: 44.0

Helena (Hilger Rd) MT, US: 46.8505, -111.987164

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 23, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 4.7 μg/m3 (20) 44.0
 
March 23, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 6.6 μg/m3 (28) 42.0
 
March 23, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 9.8 μg/m3 (41) 41.0
 
March 23, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 9.2 μg/m3 (38) 38.0
 
March 23, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 9.2 μg/m3 (38) 38.0
 
March 23, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A 6.1 μg/m3 (25) 32.0
 
March 23, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A N/A 3.2 μg/m3 (13) 26.0
 
March 23, 2019, noon N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 6.9 μg/m3 (29) 34.0
 
March 23, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A 7.1 μg/m3 (30) 35.0
 
March 23, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 6.4 μg/m3 (27) 35.0
 
March 23, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 9.2 μg/m3 (38) 38.0
 
March 23, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 9.9 μg/m3 (41) 41.0
 
March 23, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 10.2 μg/m3 (42) 42.0
 
March 23, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 17.6 μg/m3 (62) 62.0
 
March 23, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 5.2 μg/m3 (22) 39.0
 
March 23, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 2.2 μg/m3 (9) 41.0
 
March 23, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 1.7 μg/m3 (7) 42.0
 
March 23, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 58.0 ppb (45) N/A N/A 4.7 μg/m3 (20) 45.0
 
March 23, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 8.3 μg/m3 (35) 38.0
 
March 23, 2019, midnight N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A N/A 5.9 μg/m3 (25) 49.0
 
March 22, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 63.0 ppb (48) N/A N/A 2.5 μg/m3 (10) 48.0
 
March 22, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A N/A 6.8 μg/m3 (28) 49.0
 
March 22, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 66.0 ppb (51) N/A N/A 12.0 μg/m3 (50) 51.0
 
March 22, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 67.0 ppb (52) N/A N/A 17.4 μg/m3 (61) 61.0
 
March 22, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 63.0 ppb (48) N/A N/A 9.5 μg/m3 (40) 48.0
 
March 22, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 59.0 ppb (45) N/A N/A 9.3 μg/m3 (39) 45.0
 
March 22, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 16.1 μg/m3 (59) 59.0
 
March 22, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 10.7 μg/m3 (45) 45.0
 
March 22, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 22, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A N/A 9.2 μg/m3 (38) 38.0
 
March 22, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A N/A 4.4 μg/m3 (18) 27.0
 
March 22, 2019, noon N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 3.0 μg/m3 (12) 34.0
 
March 22, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A N/A 8.0 μg/m3 (33) 36.0
 
March 22, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 9.5 μg/m3 (40) 40.0
 
March 22, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 7.3 μg/m3 (30) 38.0
 
March 22, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 7.3 μg/m3 (30) 38.0
 
March 22, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 9.9 μg/m3 (41) 41.0
 
March 22, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 11.2 μg/m3 (47) 47.0
 
March 22, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 11.2 μg/m3 (47) 47.0
 
March 22, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 60.0 ppb (46) N/A N/A 9.9 μg/m3 (41) 46.0
 
March 22, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 61.0 ppb (47) N/A N/A 8.0 μg/m3 (33) 47.0
 
March 22, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A N/A 9.2 μg/m3 (38) 49.0
 
March 22, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 11.5 μg/m3 (48) 48.0
 
March 22, 2019, midnight N/A N/A N/A N/A N/A N/A 70.0 ppb (54) N/A N/A 11.9 μg/m3 (50) 54.0
 
March 21, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 70.0 ppb (54) N/A N/A 11.5 μg/m3 (48) 54.0
 
March 21, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 70.0 ppb (54) N/A N/A 17.4 μg/m3 (61) 61.0
 
March 21, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 70.0 ppb (54) N/A N/A 18.9 μg/m3 (65) 65.0
 
March 21, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 69.0 ppb (53) N/A N/A 9.3 μg/m3 (39) 53.0
 
March 21, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 67.0 ppb (52) N/A N/A 9.0 μg/m3 (38) 52.0
 
March 21, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 62.0 ppb (48) N/A N/A 22.0 μg/m3 (71) 71.0
 
March 21, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 23.2 μg/m3 (74) 74.0
 
March 21, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 12.2 μg/m3 (50) 50.0
 
March 21, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 12.6 μg/m3 (51) 51.0
 
March 21, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 12.2 μg/m3 (50) 50.0
 
March 21, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A 11.4 μg/m3 (48) 48.0
 
March 21, 2019, noon N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 9.2 μg/m3 (38) 41.0
 
March 21, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 9.7 μg/m3 (40) 41.0
 
March 21, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 11.2 μg/m3 (47) 47.0
 
March 21, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 10.9 μg/m3 (45) 45.0
 
March 21, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 12.6 μg/m3 (51) 51.0
 
March 21, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 9.5 μg/m3 (40) 43.0
 
March 21, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 59.0 ppb (45) N/A N/A 5.6 μg/m3 (23) 45.0
 
March 21, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 60.0 ppb (46) N/A N/A 3.9 μg/m3 (16) 46.0
 
March 21, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 61.0 ppb (47) N/A N/A 4.4 μg/m3 (18) 47.0
 
March 21, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 61.0 ppb (47) N/A N/A 3.2 μg/m3 (13) 47.0
 
March 21, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 63.0 ppb (48) N/A N/A 1.5 μg/m3 (6) 48.0
 
March 21, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 4.2 μg/m3 (18) 39.0
 
March 21, 2019, midnight N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A N/A 4.7 μg/m3 (20) 49.0
 
March 20, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 66.0 ppb (51) N/A N/A 3.7 μg/m3 (15) 51.0
 
March 20, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 66.0 ppb (51) N/A N/A 5.4 μg/m3 (23) 51.0
 
March 20, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 66.0 ppb (51) N/A N/A 10.0 μg/m3 (42) 51.0
 
March 20, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 67.0 ppb (52) N/A N/A 11.0 μg/m3 (46) 52.0
 
March 20, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 67.0 ppb (52) N/A N/A 11.0 μg/m3 (46) 52.0
 
March 20, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 13.2 μg/m3 (53) 53.0
 
March 20, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 59.0 ppb (45) N/A N/A 19.1 μg/m3 (65) 65.0
 
March 20, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 11.7 μg/m3 (49) 49.0
 
March 20, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 9.7 μg/m3 (40) 40.0
 
March 20, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 9.5 μg/m3 (40) 40.0
 
March 20, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A 9.7 μg/m3 (40) 40.0
 
March 20, 2019, noon N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 9.2 μg/m3 (38) 40.0
 
March 20, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 6.3 μg/m3 (26) 41.0
 
March 20, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 4.2 μg/m3 (18) 42.0
 
March 20, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 2.7 μg/m3 (11) 42.0
 
March 20, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 3.4 μg/m3 (14) 42.0
 
March 20, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 58.0 ppb (45) N/A N/A 4.9 μg/m3 (20) 45.0
 
March 20, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 7.8 μg/m3 (32) 44.0
 
March 20, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 8.5 μg/m3 (35) 44.0
 
March 20, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 59.0 ppb (45) N/A N/A -0.2 μg/m3 (0) 45.0
 
March 20, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 58.0 ppb (45) N/A N/A N/A 45.0
 
March 20, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 58.0 ppb (45) N/A N/A -2.1 μg/m3 (0) 45.0
 
March 20, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 2.0 μg/m3 (8) 37.0
 
March 20, 2019, midnight N/A N/A N/A N/A N/A N/A 63.0 ppb (48) N/A N/A 5.9 μg/m3 (25) 48.0
 
March 19, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A N/A 9.0 μg/m3 (38) 49.0
 
March 19, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 65.0 ppb (50) N/A N/A 7.8 μg/m3 (32) 50.0
 
March 19, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A N/A 5.2 μg/m3 (22) 49.0
 
March 19, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A N/A 10.0 μg/m3 (42) 49.0
 
March 19, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 62.0 ppb (48) N/A N/A 12.2 μg/m3 (50) 50.0
 
March 19, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 60.0 ppb (46) N/A N/A 9.7 μg/m3 (40) 46.0
 
March 19, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 9.7 μg/m3 (40) 42.0
 
March 19, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.6 μg/m3 (28) 28.0
 
March 19, 2019, 3 p.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 19, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 6.1 μg/m3 (25) 38.0
 
March 19, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 5.6 μg/m3 (23) 39.0
 
March 19, 2019, noon N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 4.2 μg/m3 (18) 39.0
 
March 19, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 3.7 μg/m3 (15) 39.0
 
March 19, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 2.9 μg/m3 (12) 42.0
 
March 19, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 4.4 μg/m3 (18) 41.0
 
March 19, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 4.9 μg/m3 (20) 42.0
 
March 19, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 4.2 μg/m3 (18) 42.0
 
March 19, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 5.6 μg/m3 (23) 42.0
 
March 19, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 2.7 μg/m3 (11) 43.0
 
March 19, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 2.2 μg/m3 (9) 43.0
 
March 19, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 4.4 μg/m3 (18) 44.0
 
March 19, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 58.0 ppb (45) N/A N/A 4.2 μg/m3 (18) 45.0
 
March 19, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 62.0 ppb (48) N/A N/A 7.5 μg/m3 (31) 48.0
 
March 19, 2019, midnight N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A N/A 6.6 μg/m3 (28) 49.0
 
March 18, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 65.0 ppb (50) N/A N/A 2.7 μg/m3 (11) 50.0
 
March 18, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 65.0 ppb (50) N/A N/A 5.9 μg/m3 (25) 50.0
 
March 18, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 64.0 ppb (49) N/A N/A 6.3 μg/m3 (26) 49.0
 
March 18, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 62.0 ppb (48) N/A N/A 9.0 μg/m3 (38) 48.0
 
March 18, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 59.0 ppb (45) N/A N/A 11.9 μg/m3 (50) 50.0
 
March 18, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 8.5 μg/m3 (35) 43.0
 
March 18, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 4.7 μg/m3 (20) 38.0
 
March 18, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 5.1 μg/m3 (21) 37.0
 
March 18, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 4.2 μg/m3 (18) 35.0
 
March 18, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 3.2 μg/m3 (13) 35.0
 
March 18, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A N/A 5.6 μg/m3 (23) 36.0
 
March 18, 2019, noon N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 6.4 μg/m3 (27) 37.0
 
March 18, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 4.2 μg/m3 (18) 37.0
 
March 18, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 3.7 μg/m3 (15) 38.0
 
March 18, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 1.7 μg/m3 (7) 38.0
 
March 18, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A -2.9 μg/m3 (0) 38.0
 
March 18, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 0.7 μg/m3 (3) 38.0
 
March 18, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 6.9 μg/m3 (29) 38.0
 
March 18, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 6.6 μg/m3 (28) 40.0
 
March 18, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 2.4 μg/m3 (10) 42.0
 
March 18, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 0.5 μg/m3 (2) 42.0
 
March 18, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 3.7 μg/m3 (15) 42.0
 
March 18, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 58.0 ppb (45) N/A N/A 7.0 μg/m3 (29) 45.0
 
March 18, 2019, midnight N/A N/A N/A N/A N/A N/A 61.0 ppb (47) N/A N/A 9.0 μg/m3 (38) 47.0
 
March 17, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 60.0 ppb (46) N/A N/A 6.6 μg/m3 (28) 46.0
 
March 17, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 61.0 ppb (47) N/A N/A 2.2 μg/m3 (9) 47.0
 
March 17, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 60.0 ppb (46) N/A N/A 4.4 μg/m3 (18) 46.0
 
March 17, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 58.0 ppb (45) N/A N/A 10.0 μg/m3 (42) 45.0
 
March 17, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 10.2 μg/m3 (42) 44.0
 
March 17, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (42) N/A N/A 8.0 μg/m3 (33) 42.0
 
March 17, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 8.3 μg/m3 (35) 39.0
 
March 17, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 8.0 μg/m3 (33) 38.0
 
March 17, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A N/A 5.9 μg/m3 (25) 36.0
 
March 17, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 1.7 μg/m3 (7) 37.0
 
March 17, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A N/A 1.9 μg/m3 (8) 38.0
 
March 17, 2019, noon N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 3.4 μg/m3 (14) 38.0
 
March 17, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 3.2 μg/m3 (13) 38.0
 
March 17, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A -0.2 μg/m3 (0) 39.0
 
March 17, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A -0.9 μg/m3 (0) 40.0
 
March 17, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 2.7 μg/m3 (11) 40.0
 
March 17, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 4.4 μg/m3 (18) 41.0
 
March 17, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A 2.7 μg/m3 (11) 42.0
 
March 17, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A N/A -1.9 μg/m3 (0) 42.0
 
March 17, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A 0.0 μg/m3 (0) 41.0
 
March 17, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A 2.7 μg/m3 (11) 40.0
 
March 17, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A N/A -1.9 μg/m3 (0) 40.0
 
March 17, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (41) N/A N/A -1.9 μg/m3 (0) 41.0
 
March 17, 2019, midnight N/A N/A N/A N/A N/A N/A 56.0 ppb (43) N/A N/A 1.7 μg/m3 (7) 43.0
 
March 16, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 57.0 ppb (44) N/A N/A 2.5 μg/m3 (10) 44.0
 
March 16, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 58.0 ppb (45) N/A N/A 1.5 μg/m3 (6) 45.0
 
March 16, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 60.0 ppb (46) N/A N/A 2.2 μg/m3 (9) 46.0
 
March 16, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 60.0 ppb (46) N/A N/A 6.4 μg/m3 (27) 46.0