AQSQID: 170314201

Site Name: Northbrk

Location: Nbrook, IL

Reporting: True, Located: True

Current AQI: 35.0

Nbrook IL, US: 42.1406, -87.7994

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 25, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A 0.6 μg/m3 (2) 35.0
 
March 25, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 0.5 μg/m3 (2) 34.0
 
March 25, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 0.7 μg/m3 (3) 34.0
 
March 25, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 0.9 μg/m3 (4) 34.0
 
March 25, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A N/A 2.0 μg/m3 (8) 33.0
 
March 25, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A N/A 2.8 μg/m3 (12) 32.0
 
March 25, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A -2.3 μg/m3 (0) 32.0
 
March 25, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A 3.5 μg/m3 (15) 31.0
 
March 25, 2019, noon N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A N/A 1.0 μg/m3 (4) 30.0
 
March 25, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A 2.8 μg/m3 (12) 31.0
 
March 25, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A 5.6 μg/m3 (23) 31.0
 
March 25, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A 4.7 μg/m3 (20) 31.0
 
March 25, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A 3.4 μg/m3 (14) 32.0
 
March 25, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A -2.6 μg/m3 (0) 32.0
 
March 25, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A N/A -3.6 μg/m3 (0) 33.0
 
March 25, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A N/A -2.5 μg/m3 (0) 33.0
 
March 25, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A -0.1 μg/m3 (0) 32.0
 
March 25, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A N/A 1.0 μg/m3 (4) 32.0
 
March 25, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A -3.8 μg/m3 (0) 32.0
 
March 25, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A 1.3 μg/m3 (5) 31.0
 
March 25, 2019, midnight N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A 12.9 μg/m3 (52) 52.0
 
March 24, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A N/A 20.6 μg/m3 (68) 68.0
 
March 24, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A N/A 21.3 μg/m3 (70) 70.0
 
March 24, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A N/A 15.3 μg/m3 (57) 57.0
 
March 24, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A 15.9 μg/m3 (58) 58.0
 
March 24, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A N/A 21.9 μg/m3 (71) 71.0
 
March 24, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A N/A 18.6 μg/m3 (64) 64.0
 
March 24, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A N/A 16.6 μg/m3 (60) 60.0
 
March 24, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A N/A 14.4 μg/m3 (55) 55.0
 
March 24, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 11.0 ppb (8) N/A N/A 13.1 μg/m3 (52) 52.0
 
March 24, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 11.0 ppb (8) N/A N/A 6.8 μg/m3 (28) 28.0
 
March 24, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 7.0 ppb (5) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 24, 2019, noon N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A N/A 11.4 μg/m3 (48) 48.0
 
March 24, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A N/A 16.1 μg/m3 (59) 59.0
 
March 24, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A N/A 19.7 μg/m3 (66) 66.0
 
March 24, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A N/A 24.5 μg/m3 (77) 77.0
 
March 24, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A N/A 18.7 μg/m3 (64) 64.0
 
March 24, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A N/A 18.0 μg/m3 (63) 63.0
 
March 24, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A N/A 15.6 μg/m3 (58) 58.0
 
March 24, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 10.0 ppb (8) N/A N/A 10.6 μg/m3 (44) 44.0
 
March 24, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A N/A 10.5 μg/m3 (44) 44.0
 
March 24, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A N/A 13.8 μg/m3 (54) 54.0
 
March 24, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A N/A 10.7 μg/m3 (45) 45.0
 
March 24, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (22) N/A N/A 12.3 μg/m3 (51) 51.0
 
March 24, 2019, midnight N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A N/A 8.6 μg/m3 (36) 36.0
 
March 23, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A N/A 16.1 μg/m3 (59) 59.0
 
March 23, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A N/A 13.5 μg/m3 (53) 53.0
 
March 23, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A N/A 6.4 μg/m3 (27) 27.0
 
March 23, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A N/A 5.5 μg/m3 (23) 28.0
 
March 23, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A N/A 1.5 μg/m3 (6) 29.0
 
March 23, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A N/A 0.5 μg/m3 (2) 30.0
 
March 23, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A N/A 4.6 μg/m3 (19) 28.0
 
March 23, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A N/A 6.0 μg/m3 (25) 25.0
 
March 23, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A N/A 0.7 μg/m3 (3) 27.0
 
March 23, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A N/A 12.1 μg/m3 (50) 50.0
 
March 23, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A N/A 18.1 μg/m3 (63) 63.0
 
March 23, 2019, noon N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A N/A 16.2 μg/m3 (59) 59.0
 
March 23, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A N/A 15.6 μg/m3 (58) 58.0
 
March 23, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A 13.5 μg/m3 (53) 53.0
 
March 23, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A N/A 15.2 μg/m3 (57) 57.0
 
March 23, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A N/A 13.7 μg/m3 (54) 54.0
 
March 23, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A N/A 12.6 μg/m3 (51) 51.0
 
March 23, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A N/A 14.4 μg/m3 (55) 55.0
 
March 23, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 3.0 ppb (2) N/A N/A 6.7 μg/m3 (28) 28.0
 
March 23, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A N/A 4.5 μg/m3 (19) 19.0
 
March 23, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A N/A 1.4 μg/m3 (6) 17.0
 
March 23, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A N/A 7.3 μg/m3 (30) 30.0
 
March 23, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A 0.9 μg/m3 (4) 31.0
 
March 23, 2019, midnight N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 7.3 μg/m3 (30) 34.0
 
March 22, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 7.3 μg/m3 (30) 35.0
 
March 22, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A -0.3 μg/m3 (0) 35.0
 
March 22, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A N/A 0.5 μg/m3 (2) 36.0
 
March 22, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A -1.3 μg/m3 (0) 35.0
 
March 22, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A -2.4 μg/m3 (0) 35.0
 
March 22, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A 0.1 μg/m3 (0) 35.0
 
March 22, 2019, 5 p.m. 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, 4 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 0.1 μg/m3 (0) 34.0
 
March 22, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 22, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A 10.1 μg/m3 (42) 42.0
 
March 22, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A N/A -1.7 μg/m3 (0) 24.0
 
March 22, 2019, noon N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A N/A 7.8 μg/m3 (32) 32.0
 
March 22, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A N/A 4.9 μg/m3 (20) 25.0
 
March 22, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A N/A 12.9 μg/m3 (52) 52.0
 
March 22, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A N/A 9.5 μg/m3 (40) 40.0
 
March 22, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A N/A 11.3 μg/m3 (47) 47.0
 
March 22, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A N/A 6.9 μg/m3 (29) 29.0
 
March 22, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A N/A 5.9 μg/m3 (25) 28.0
 
March 22, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A N/A 4.4 μg/m3 (18) 28.0
 
March 22, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A N/A 2.6 μg/m3 (11) 28.0
 
March 22, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A N/A 5.0 μg/m3 (21) 31.0
 
March 22, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A N/A 6.7 μg/m3 (28) 28.0
 
March 22, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A N/A 6.3 μg/m3 (26) 26.0
 
March 22, 2019, midnight N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A N/A 10.7 μg/m3 (45) 45.0
 
March 21, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A 11.8 μg/m3 (49) 49.0
 
March 21, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A 7.5 μg/m3 (31) 32.0
 
March 21, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A N/A 0.6 μg/m3 (2) 32.0
 
March 21, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A N/A 3.6 μg/m3 (15) 32.0
 
March 21, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (30) N/A N/A 6.8 μg/m3 (28) 30.0
 
March 21, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A N/A 14.7 μg/m3 (56) 56.0
 
March 21, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A N/A 17.5 μg/m3 (62) 62.0
 
March 21, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A N/A 8.4 μg/m3 (35) 35.0
 
March 21, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A N/A 14.1 μg/m3 (54) 54.0
 
March 21, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A N/A 16.6 μg/m3 (60) 60.0
 
March 21, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A N/A 20.5 μg/m3 (68) 68.0
 
March 21, 2019, noon N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A N/A 17.9 μg/m3 (63) 63.0
 
March 21, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A N/A 21.0 μg/m3 (69) 69.0
 
March 21, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (22) N/A N/A 18.6 μg/m3 (64) 64.0
 
March 21, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A N/A 13.3 μg/m3 (53) 53.0
 
March 21, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A N/A 7.2 μg/m3 (30) 30.0
 
March 21, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A N/A 44.8 μg/m3 (123) 123.0
 
March 21, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A N/A 26.3 μg/m3 (80) 80.0
 
March 21, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A N/A 10.8 μg/m3 (45) 45.0
 
March 21, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A N/A 6.2 μg/m3 (26) 26.0
 
March 21, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A N/A 11.3 μg/m3 (47) 47.0
 
March 21, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A N/A 20.6 μg/m3 (68) 68.0
 
March 21, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A N/A 26.2 μg/m3 (80) 80.0
 
March 21, 2019, midnight N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A N/A 29.6 μg/m3 (87) 87.0
 
March 20, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A N/A 27.1 μg/m3 (82) 82.0
 
March 20, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A N/A 20.1 μg/m3 (67) 67.0
 
March 20, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A N/A 19.7 μg/m3 (66) 66.0
 
March 20, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A N/A 18.3 μg/m3 (63) 63.0
 
March 20, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (21) N/A N/A 17.0 μg/m3 (61) 61.0
 
March 20, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A N/A 15.9 μg/m3 (58) 58.0
 
March 20, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (22) N/A N/A 17.7 μg/m3 (62) 62.0
 
March 20, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 17.1 μg/m3 (61) 61.0
 
March 20, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A N/A 15.7 μg/m3 (58) 58.0
 
March 20, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A N/A 16.2 μg/m3 (59) 59.0
 
March 20, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A N/A 15.4 μg/m3 (57) 57.0
 
March 20, 2019, noon N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A N/A 15.5 μg/m3 (57) 57.0
 
March 20, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A N/A 16.6 μg/m3 (60) 60.0
 
March 20, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A N/A 13.1 μg/m3 (52) 52.0
 
March 20, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A N/A 15.4 μg/m3 (57) 57.0
 
March 20, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A N/A 15.3 μg/m3 (57) 57.0
 
March 20, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (22) N/A N/A 13.9 μg/m3 (54) 54.0
 
March 20, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A N/A 17.3 μg/m3 (61) 61.0
 
March 20, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A N/A 18.2 μg/m3 (63) 63.0
 
March 20, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A N/A 17.2 μg/m3 (61) 61.0
 
March 20, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A N/A 10.9 μg/m3 (45) 45.0
 
March 20, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A N/A 10.4 μg/m3 (43) 43.0
 
March 20, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A N/A 9.2 μg/m3 (38) 38.0
 
March 20, 2019, midnight N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 13.3 μg/m3 (53) 53.0
 
March 19, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 0.5 μg/m3 (2) 38.0
 
March 19, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 6.1 μg/m3 (25) 39.0
 
March 19, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A N/A 1.8 μg/m3 (8) 39.0
 
March 19, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (38) N/A N/A 0.5 μg/m3 (2) 38.0
 
March 19, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (37) N/A N/A 0.2 μg/m3 (1) 37.0
 
March 19, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A N/A -1.3 μg/m3 (0) 35.0
 
March 19, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A 3.2 μg/m3 (13) 35.0
 
March 19, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 4.2 μg/m3 (18) 34.0
 
March 19, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A N/A 6.5 μg/m3 (27) 27.0
 
March 19, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 13.0 ppb (10) N/A N/A 9.9 μg/m3 (41) 41.0
 
March 19, 2019, noon N/A N/A N/A N/A N/A N/A 4.0 ppb (3) N/A N/A 17.6 μg/m3 (62) 62.0
 
March 19, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A N/A 14.6 μg/m3 (56) 56.0
 
March 19, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 8.0 ppb (6) N/A N/A 12.0 μg/m3 (50) 50.0
 
March 19, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 10.0 ppb (8) N/A N/A 16.0 μg/m3 (59) 59.0
 
March 19, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A N/A 15.0 μg/m3 (56) 56.0
 
March 19, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A N/A 15.5 μg/m3 (57) 57.0
 
March 19, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A N/A 13.0 μg/m3 (52) 52.0
 
March 19, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A N/A 13.7 μg/m3 (54) 54.0
 
March 19, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A N/A 15.8 μg/m3 (58) 58.0
 
March 19, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A N/A 11.6 μg/m3 (48) 48.0
 
March 19, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (21) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A N/A 15.3 μg/m3 (57) 57.0
 
March 19, 2019, midnight N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A N/A 14.5 μg/m3 (55) 55.0
 
March 18, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A 8.8 μg/m3 (37) 37.0
 
March 18, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A N/A 0.3 μg/m3 (1) 35.0
 
March 18, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A N/A 9.6 μg/m3 (40) 40.0