AQSQID: 381050003

Site Name: Williston

Location: Williston, ND

Reporting: True, Located: True

Current AQI: 21.0

Williston ND, US: 48.152822, -103.639583

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 25, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (21) N/A 6.0 μg/m3 (5) 3.0 μg/m3 (12) 21.0
 
March 25, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (21) N/A 7.0 μg/m3 (6) 4.9 μg/m3 (20) 21.0
 
March 25, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A 7.0 μg/m3 (6) 6.0 μg/m3 (25) 25.0
 
March 25, 2019, midnight N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 7.0 μg/m3 (6) 4.3 μg/m3 (18) 19.0
 
March 24, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 7.0 μg/m3 (6) 6.2 μg/m3 (26) 26.0
 
March 24, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 7.0 μg/m3 (6) 6.5 μg/m3 (27) 27.0
 
March 24, 2019, 9 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) 3.3 μg/m3 (14) 24.0
 
March 24, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 7.0 μg/m3 (6) 5.4 μg/m3 (23) 23.0
 
March 24, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (21) N/A 7.0 μg/m3 (6) 5.6 μg/m3 (23) 23.0
 
March 24, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A 7.0 μg/m3 (6) 4.4 μg/m3 (18) 20.0
 
March 24, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (21) N/A 7.0 μg/m3 (6) 5.8 μg/m3 (24) 24.0
 
March 24, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (22) N/A 6.0 μg/m3 (5) 7.2 μg/m3 (30) 30.0
 
March 24, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 6.0 μg/m3 (5) 4.0 μg/m3 (17) 22.0
 
March 24, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A 6.0 μg/m3 (5) 5.1 μg/m3 (21) 23.0
 
March 24, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 6.0 μg/m3 (5) 2.8 μg/m3 (12) 25.0
 
March 24, 2019, noon N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 5.0 μg/m3 (5) 3.8 μg/m3 (16) 25.0
 
March 24, 2019, 11 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) 5.8 μg/m3 (24) 25.0
 
March 24, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 7.0 μg/m3 (6) 7.7 μg/m3 (32) 32.0
 
March 24, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 7.0 μg/m3 (6) 9.4 μg/m3 (39) 39.0
 
March 24, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 11.0 μg/m3 (10) 10.1 μg/m3 (42) 42.0
 
March 24, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 10.0 μg/m3 (9) 13.2 μg/m3 (53) 53.0
 
March 24, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 10.0 μg/m3 (9) 9.3 μg/m3 (39) 39.0
 
March 24, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A 10.0 μg/m3 (9) 10.1 μg/m3 (42) 42.0
 
March 24, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 10.0 μg/m3 (9) 12.7 μg/m3 (51) 51.0
 
March 24, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 11.0 μg/m3 (10) 12.1 μg/m3 (50) 50.0
 
March 24, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 11.0 μg/m3 (10) 8.2 μg/m3 (34) 34.0
 
March 24, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 13.0 μg/m3 (12) 7.7 μg/m3 (32) 32.0
 
March 24, 2019, midnight N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 17.0 μg/m3 (15) 3.2 μg/m3 (13) 28.0
 
March 23, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 15.0 μg/m3 (14) 3.0 μg/m3 (12) 32.0
 
March 23, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 11.0 μg/m3 (10) 4.8 μg/m3 (20) 32.0
 
March 23, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 33.0 μg/m3 (30) 1.3 μg/m3 (5) 31.0
 
March 23, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 12.0 μg/m3 (11) 3.1 μg/m3 (13) 28.0
 
March 23, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 7.0 μg/m3 (6) 5.1 μg/m3 (21) 25.0
 
March 23, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A 7.0 μg/m3 (6) 5.4 μg/m3 (23) 23.0
 
March 23, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 7.0 μg/m3 (6) 5.7 μg/m3 (24) 24.0
 
March 23, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 8.0 μg/m3 (7) 5.8 μg/m3 (24) 24.0
 
March 23, 2019, 3 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) 6.9 μg/m3 (29) 29.0
 
March 23, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 6.0 ppb (5) N/A 8.0 μg/m3 (7) 4.8 μg/m3 (20) 20.0
 
March 23, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A 8.0 μg/m3 (7) 5.7 μg/m3 (24) 24.0
 
March 23, 2019, noon N/A N/A N/A N/A N/A N/A 3.0 ppb (2) N/A 6.0 μg/m3 (5) 3.0 μg/m3 (12) 12.0
 
March 23, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A 6.0 μg/m3 (5) 2.4 μg/m3 (10) 10.0
 
March 23, 2019, 10 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) 2.8 μg/m3 (12) 15.0
 
March 23, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A 5.0 μg/m3 (5) 3.2 μg/m3 (13) 16.0
 
March 23, 2019, 8 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) 1.6 μg/m3 (7) 15.0
 
March 23, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A 5.0 μg/m3 (5) 1.2 μg/m3 (5) 23.0
 
March 23, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 4.0 μg/m3 (4) 2.1 μg/m3 (9) 25.0
 
March 23, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A 4.0 μg/m3 (4) 3.2 μg/m3 (13) 24.0
 
March 23, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A 5.0 μg/m3 (5) 3.5 μg/m3 (15) 24.0
 
March 23, 2019, 3 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) 2.4 μg/m3 (10) 27.0
 
March 23, 2019, 2 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) 1.5 μg/m3 (6) 29.0
 
March 23, 2019, 1 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) 0.6 μg/m3 (2) 30.0
 
March 23, 2019, midnight N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 8.0 μg/m3 (7) 0.4 μg/m3 (2) 31.0
 
March 22, 2019, 11 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) 1.2 μg/m3 (5) 32.0
 
March 22, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 8.0 μg/m3 (7) 2.5 μg/m3 (10) 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 8.0 μg/m3 (7) 4.4 μg/m3 (18) 36.0
 
March 22, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A 9.0 μg/m3 (8) 4.4 μg/m3 (18) 38.0
 
March 22, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 11.0 μg/m3 (10) 4.3 μg/m3 (18) 39.0
 
March 22, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 11.0 μg/m3 (10) 4.2 μg/m3 (18) 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 10.0 μg/m3 (9) 5.9 μg/m3 (25) 37.0
 
March 22, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 9.0 μg/m3 (8) 6.6 μg/m3 (28) 34.0
 
March 22, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 8.0 μg/m3 (7) 7.0 μg/m3 (29) 31.0
 
March 22, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A 6.0 μg/m3 (5) 10.3 μg/m3 (43) 43.0
 
March 22, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A 7.0 μg/m3 (6) 12.5 μg/m3 (51) 51.0
 
March 22, 2019, noon N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A 8.0 μg/m3 (7) 13.1 μg/m3 (52) 52.0
 
March 22, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A 8.0 μg/m3 (7) 9.0 μg/m3 (38) 38.0
 
March 22, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 6.0 μg/m3 (5) 17.4 μg/m3 (61) 61.0
 
March 22, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 13.0 ppb (10) N/A 7.0 μg/m3 (6) 13.7 μg/m3 (54) 54.0
 
March 22, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 7.0 μg/m3 (6) 13.7 μg/m3 (54) 54.0
 
March 22, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A 7.0 μg/m3 (6) 14.4 μg/m3 (55) 55.0
 
March 22, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (22) N/A 7.0 μg/m3 (6) 13.6 μg/m3 (53) 53.0
 
March 22, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 9.0 μg/m3 (8) 13.6 μg/m3 (53) 53.0
 
March 22, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 9.0 μg/m3 (8) 12.2 μg/m3 (50) 50.0
 
March 22, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 9.0 μg/m3 (8) 12.3 μg/m3 (51) 51.0
 
March 22, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 11.0 μg/m3 (10) 9.3 μg/m3 (39) 39.0
 
March 22, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 13.0 μg/m3 (12) 10.2 μg/m3 (42) 42.0
 
March 22, 2019, midnight N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 18.0 μg/m3 (16) 9.1 μg/m3 (38) 38.0
 
March 21, 2019, 11 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) 10.2 μg/m3 (42) 42.0
 
March 21, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A 21.0 μg/m3 (19) 10.2 μg/m3 (42) 42.0
 
March 21, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 58.0 ppb (45) N/A 20.0 μg/m3 (18) 10.8 μg/m3 (45) 45.0
 
March 21, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (42) N/A 21.0 μg/m3 (19) 9.7 μg/m3 (40) 42.0
 
March 21, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 20.0 μg/m3 (18) 7.5 μg/m3 (31) 32.0
 
March 21, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 21.0 μg/m3 (19) 5.9 μg/m3 (25) 31.0
 
March 21, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (28) N/A 19.0 μg/m3 (17) 4.7 μg/m3 (20) 28.0
 
March 21, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A 12.0 μg/m3 (11) 6.3 μg/m3 (26) 26.0
 
March 21, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A 6.0 μg/m3 (5) 8.9 μg/m3 (37) 37.0
 
March 21, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
March 21, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
March 21, 2019, noon N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A 7.0 μg/m3 (6) 8.1 μg/m3 (34) 34.0
 
March 21, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 8.0 μg/m3 (7) 8.4 μg/m3 (35) 35.0
 
March 21, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A 7.0 μg/m3 (6) 8.8 μg/m3 (37) 37.0
 
March 21, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A 7.0 μg/m3 (6) 10.5 μg/m3 (44) 44.0
 
March 21, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A 7.0 μg/m3 (6) 13.8 μg/m3 (54) 54.0
 
March 21, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A 10.0 μg/m3 (9) 13.4 μg/m3 (53) 53.0
 
March 21, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A 10.0 μg/m3 (9) 12.4 μg/m3 (51) 51.0
 
March 21, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 10.0 ppb (8) N/A 10.0 μg/m3 (9) 14.3 μg/m3 (55) 55.0
 
March 21, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A 11.0 μg/m3 (10) 15.6 μg/m3 (58) 58.0
 
March 21, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A 13.0 μg/m3 (12) 14.2 μg/m3 (55) 55.0
 
March 21, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 12.0 μg/m3 (11) 11.8 μg/m3 (49) 49.0
 
March 21, 2019, 1 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) 6.3 μg/m3 (26) 29.0
 
March 21, 2019, midnight N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 14.0 μg/m3 (13) 5.2 μg/m3 (22) 35.0
 
March 20, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (38) N/A 11.0 μg/m3 (10) 5.9 μg/m3 (25) 38.0
 
March 20, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (39) N/A 12.0 μg/m3 (11) 7.0 μg/m3 (29) 39.0
 
March 20, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A 12.0 μg/m3 (11) 5.8 μg/m3 (24) 40.0
 
March 20, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (40) N/A 11.0 μg/m3 (10) 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 9.0 μg/m3 (8) 6.0 μg/m3 (25) 38.0
 
March 20, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 9.0 μg/m3 (8) 4.8 μg/m3 (20) 35.0
 
March 20, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 9.0 μg/m3 (8) 7.3 μg/m3 (30) 34.0
 
March 20, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 7.0 μg/m3 (6) 8.4 μg/m3 (35) 35.0
 
March 20, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 9.0 μg/m3 (8) 8.6 μg/m3 (36) 36.0
 
March 20, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 14.0 ppb (11) N/A 9.0 μg/m3 (8) 10.7 μg/m3 (45) 45.0
 
March 20, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 6.0 ppb (5) N/A 9.0 μg/m3 (8) 9.4 μg/m3 (39) 39.0
 
March 20, 2019, noon N/A N/A N/A N/A N/A N/A 6.0 ppb (5) N/A 7.0 μg/m3 (6) 4.3 μg/m3 (18) 18.0
 
March 20, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 10.0 ppb (8) N/A 7.0 μg/m3 (6) 6.6 μg/m3 (28) 28.0
 
March 20, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 6.0 μg/m3 (5) 6.8 μg/m3 (28) 28.0
 
March 20, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A 5.0 μg/m3 (5) 5.8 μg/m3 (24) 24.0
 
March 20, 2019, 8 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) 6.9 μg/m3 (29) 29.0
 
March 20, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 5.0 μg/m3 (5) 6.2 μg/m3 (26) 26.0
 
March 20, 2019, 6 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) 4.3 μg/m3 (18) 29.0
 
March 20, 2019, 5 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) 5.2 μg/m3 (22) 34.0
 
March 20, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 5.0 μg/m3 (5) 7.7 μg/m3 (32) 35.0
 
March 20, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 6.0 μg/m3 (5) 5.7 μg/m3 (24) 36.0
 
March 20, 2019, 2 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) 6.1 μg/m3 (25) 31.0
 
March 20, 2019, 1 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) 4.4 μg/m3 (18) 31.0
 
March 20, 2019, midnight N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 8.0 μg/m3 (7) 4.8 μg/m3 (20) 33.0
 
March 19, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 7.0 μg/m3 (6) 3.9 μg/m3 (16) 36.0
 
March 19, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 8.0 μg/m3 (7) 3.4 μg/m3 (14) 35.0
 
March 19, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 7.0 μg/m3 (6) 2.3 μg/m3 (10) 35.0
 
March 19, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 6.0 μg/m3 (5) 0.5 μg/m3 (2) 36.0
 
March 19, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 5.0 μg/m3 (5) 2.2 μg/m3 (9) 36.0
 
March 19, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 5.0 μg/m3 (5) 4.2 μg/m3 (18) 35.0
 
March 19, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 6.0 μg/m3 (5) 4.3 μg/m3 (18) 35.0
 
March 19, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (33) N/A 6.0 μg/m3 (5) 6.3 μg/m3 (26) 33.0
 
March 19, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 6.0 μg/m3 (5) 8.9 μg/m3 (37) 37.0
 
March 19, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (21) N/A 5.0 μg/m3 (5) 6.3 μg/m3 (26) 26.0
 
March 19, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 6.0 μg/m3 (5) 6.3 μg/m3 (26) 26.0
 
March 19, 2019, noon N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 6.0 μg/m3 (5) 4.7 μg/m3 (20) 20.0
 
March 19, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A 5.0 μg/m3 (5) 5.0 μg/m3 (21) 21.0
 
March 19, 2019, 10 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) 5.7 μg/m3 (24) 27.0
 
March 19, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 5.0 μg/m3 (5) 5.6 μg/m3 (23) 26.0
 
March 19, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (21) N/A 6.0 μg/m3 (5) 4.8 μg/m3 (20) 21.0
 
March 19, 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) 5.0 μg/m3 (21) 27.0
 
March 19, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (32) N/A 5.0 μg/m3 (5) 6.4 μg/m3 (27) 32.0
 
March 19, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 6.0 μg/m3 (5) 6.9 μg/m3 (29) 34.0
 
March 19, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (35) N/A 7.0 μg/m3 (6) 5.5 μg/m3 (23) 35.0
 
March 19, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 7.0 μg/m3 (6) 7.5 μg/m3 (31) 36.0
 
March 19, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 7.0 μg/m3 (6) 7.8 μg/m3 (32) 32.0
 
March 19, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 8.0 μg/m3 (7) 5.4 μg/m3 (23) 31.0
 
March 19, 2019, midnight N/A N/A N/A N/A N/A N/A 42.0 ppb (32) N/A 8.0 μg/m3 (7) 3.3 μg/m3 (14) 32.0
 
March 18, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (35) N/A 8.0 μg/m3 (7) 2.9 μg/m3 (12) 35.0
 
March 18, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 6.0 μg/m3 (5) 3.6 μg/m3 (15) 36.0
 
March 18, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (36) N/A 7.0 μg/m3 (6) 3.2 μg/m3 (13) 36.0
 
March 18, 2019, 8 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) 3.9 μg/m3 (16) 35.0
 
March 18, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 6.0 μg/m3 (5) 2.1 μg/m3 (9) 34.0
 
March 18, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (34) N/A 6.0 μg/m3 (5) 1.5 μg/m3 (6) 34.0
 
March 18, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (31) N/A 6.0 μg/m3 (5) 2.6 μg/m3 (11) 31.0
 
March 18, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 4.0 μg/m3 (4) 2.2 μg/m3 (9) 29.0
 
March 18, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (28) N/A 4.0 μg/m3 (4) 2.8 μg/m3 (12) 28.0
 
March 18, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 3.0 μg/m3 (3) 5.4 μg/m3 (23) 23.0
 
March 18, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 4.0 μg/m3 (4) 7.7 μg/m3 (32) 32.0
 
March 18, 2019, noon N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 4.0 μg/m3 (4) 8.3 μg/m3 (35) 35.0
 
March 18, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 4.0 μg/m3 (4) 9.8 μg/m3 (41) 41.0
 
March 18, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A 4.0 μg/m3 (4) 11.0 μg/m3 (46) 46.0
 
March 18, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 4.0 μg/m3 (4) 14.7 μg/m3 (56) 56.0
 
March 18, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 4.0 ppb (3) N/A 7.0 μg/m3 (6) 11.6 μg/m3 (48) 48.0
 
March 18, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 10.0 ppb (8) N/A 6.0 μg/m3 (5) 12.1 μg/m3 (50) 50.0
 
March 18, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 6.0 μg/m3 (5) 11.1 μg/m3 (46) 46.0
 
March 18, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 6.0 ppb (5) N/A 8.0 μg/m3 (7) 8.6 μg/m3 (36) 36.0
 
March 18, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A 8.0 μg/m3 (7) 6.2 μg/m3 (26) 26.0