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
Oct. 8, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 8.0 μg/m3 (7) 4.4 μg/m3 (18) 18.0
 
Oct. 8, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 6.0 ppb (5) N/A 7.0 μg/m3 (6) 3.1 μg/m3 (13) 13.0
 
Oct. 8, 2019, noon N/A N/A N/A N/A N/A N/A 7.0 ppb (5) N/A 6.0 μg/m3 (5) 1.7 μg/m3 (7) 7.0
 
Oct. 8, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A 5.0 μg/m3 (5) 3.9 μg/m3 (16) 16.0
 
Oct. 8, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 10.0 ppb (8) N/A 5.0 μg/m3 (5) 2.4 μg/m3 (10) 10.0
 
Oct. 8, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 10.0 ppb (8) N/A 5.0 μg/m3 (5) 2.7 μg/m3 (11) 11.0
 
Oct. 8, 2019, 8 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) 3.6 μg/m3 (15) 15.0
 
Oct. 8, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 13.0 ppb (10) N/A 6.0 μg/m3 (5) 2.6 μg/m3 (11) 11.0
 
Oct. 8, 2019, 6 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) 3.5 μg/m3 (15) 15.0
 
Oct. 8, 2019, 5 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) 1.0 μg/m3 (4) 15.0
 
Oct. 8, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A 7.0 μg/m3 (6) 0.1 μg/m3 (0) 15.0
 
Oct. 8, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A 7.0 μg/m3 (6) -0.7 μg/m3 (0) 18.0
 
Oct. 8, 2019, 2 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) -1.3 μg/m3 (0) 23.0
 
Oct. 8, 2019, 1 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) -1.3 μg/m3 (0) 20.0
 
Oct. 8, 2019, midnight N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 5.0 μg/m3 (5) -0.6 μg/m3 (0) 22.0
 
Oct. 7, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (24) N/A 5.0 μg/m3 (5) 0.7 μg/m3 (3) 24.0
 
Oct. 7, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 5.0 μg/m3 (5) -0.6 μg/m3 (0) 25.0
 
Oct. 7, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 5.0 μg/m3 (5) -1.0 μg/m3 (0) 25.0
 
Oct. 7, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 5.0 μg/m3 (5) -2.1 μg/m3 (0) 25.0
 
Oct. 7, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (25) N/A 2.0 μg/m3 (2) -2.0 μg/m3 (0) 25.0
 
Oct. 7, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 2.0 μg/m3 (2) -2.7 μg/m3 (0) 22.0
 
Oct. 7, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 3.0 μg/m3 (3) -1.9 μg/m3 (0) 18.0
 
Oct. 7, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 3.0 μg/m3 (3) 0.8 μg/m3 (3) 14.0
 
Oct. 7, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A 4.0 μg/m3 (4) 0.6 μg/m3 (2) 12.0
 
Oct. 7, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 11.0 ppb (8) N/A 3.0 μg/m3 (3) 2.7 μg/m3 (11) 11.0
 
Oct. 7, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 5.0 ppb (4) N/A 4.0 μg/m3 (4) 3.7 μg/m3 (15) 15.0
 
Oct. 7, 2019, noon N/A N/A N/A N/A N/A N/A 7.0 ppb (5) N/A 4.0 μg/m3 (4) 4.5 μg/m3 (19) 19.0
 
Oct. 7, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 7.0 ppb (5) N/A 4.0 μg/m3 (4) 7.3 μg/m3 (30) 30.0
 
Oct. 7, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A 4.0 μg/m3 (4) 3.6 μg/m3 (15) 15.0
 
Oct. 7, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A 5.0 μg/m3 (5) 3.3 μg/m3 (14) 14.0
 
Oct. 7, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 7.0 ppb (5) N/A 5.0 μg/m3 (5) 3.6 μg/m3 (15) 15.0
 
Oct. 7, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 8.0 ppb (6) N/A 5.0 μg/m3 (5) 2.4 μg/m3 (10) 10.0
 
Oct. 7, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A 5.0 μg/m3 (5) 2.4 μg/m3 (10) 10.0
 
Oct. 7, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 5.0 μg/m3 (5) 2.0 μg/m3 (8) 13.0
 
Oct. 7, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 6.0 μg/m3 (5) 4.1 μg/m3 (17) 17.0
 
Oct. 7, 2019, 3 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) 5.0 μg/m3 (21) 21.0
 
Oct. 7, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (18) N/A 9.0 μg/m3 (8) 1.9 μg/m3 (8) 18.0
 
Oct. 7, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (22) N/A 7.0 μg/m3 (6) 3.5 μg/m3 (15) 22.0
 
Oct. 7, 2019, midnight N/A N/A N/A N/A N/A N/A 30.0 ppb (23) N/A 9.0 μg/m3 (8) 3.6 μg/m3 (15) 23.0
 
Oct. 6, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (26) N/A 8.0 μg/m3 (7) -0.1 μg/m3 (0) 26.0
 
Oct. 6, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 8.0 μg/m3 (7) 0.0 μg/m3 (0) 29.0
 
Oct. 6, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (29) N/A 7.0 μg/m3 (6) -0.6 μg/m3 (0) 29.0
 
Oct. 6, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 6.0 μg/m3 (5) -0.9 μg/m3 (0) 25.0
 
Oct. 6, 2019, 7 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) 3.3 μg/m3 (14) 23.0
 
Oct. 6, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 6.0 μg/m3 (5) 4.4 μg/m3 (18) 19.0
 
Oct. 6, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A 5.0 μg/m3 (5) -0.4 μg/m3 (0) 16.0
 
Oct. 6, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 4.0 μg/m3 (4) 0.3 μg/m3 (1) 15.0
 
Oct. 6, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 5.0 μg/m3 (5) 0.7 μg/m3 (3) 14.0
 
Oct. 6, 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) -0.7 μg/m3 (0) 13.0
 
Oct. 6, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 6.0 μg/m3 (5) 0.6 μg/m3 (2) 14.0
 
Oct. 6, 2019, noon N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 5.0 μg/m3 (5) 1.8 μg/m3 (8) 15.0
 
Oct. 6, 2019, 11 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) 1.0 μg/m3 (4) 15.0
 
Oct. 6, 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) 0.6 μg/m3 (2) 15.0
 
Oct. 6, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 6.0 μg/m3 (5) 0.6 μg/m3 (2) 13.0
 
Oct. 6, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A 6.0 μg/m3 (5) 1.0 μg/m3 (4) 15.0
 
Oct. 6, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A 5.0 μg/m3 (5) 0.8 μg/m3 (3) 17.0
 
Oct. 6, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A 5.0 μg/m3 (5) 1.5 μg/m3 (6) 17.0
 
Oct. 6, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A 5.0 μg/m3 (5) 0.3 μg/m3 (1) 17.0
 
Oct. 6, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A 5.0 μg/m3 (5) -1.6 μg/m3 (0) 18.0
 
Oct. 6, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 5.0 μg/m3 (5) -1.4 μg/m3 (0) 19.0
 
Oct. 6, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A 6.0 μg/m3 (5) 0.0 μg/m3 (0) 20.0
 
Oct. 6, 2019, 1 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) 2.2 μg/m3 (9) 21.0
 
Oct. 6, 2019, midnight N/A N/A N/A N/A N/A N/A 26.0 ppb (20) N/A 6.0 μg/m3 (5) 2.8 μg/m3 (12) 20.0
 
Oct. 5, 2019, 11 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) -0.5 μg/m3 (0) 23.0
 
Oct. 5, 2019, 10 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) -0.8 μg/m3 (0) 25.0
 
Oct. 5, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 5.0 μg/m3 (5) 0.4 μg/m3 (2) 25.0
 
Oct. 5, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (25) N/A 4.0 μg/m3 (4) 0.9 μg/m3 (4) 25.0
 
Oct. 5, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (22) N/A 4.0 μg/m3 (4) 0.1 μg/m3 (0) 22.0
 
Oct. 5, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A 4.0 μg/m3 (4) -1.8 μg/m3 (0) 19.0
 
Oct. 5, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A 5.0 μg/m3 (5) -1.5 μg/m3 (0) 17.0
 
Oct. 5, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 5.0 μg/m3 (5) 0.1 μg/m3 (0) 15.0
 
Oct. 5, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 14.0 ppb (11) N/A 5.0 μg/m3 (5) 2.8 μg/m3 (12) 12.0
 
Oct. 5, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 6.0 ppb (5) N/A 5.0 μg/m3 (5) 4.1 μg/m3 (17) 17.0
 
Oct. 5, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 1.0 ppb (1) N/A 6.0 μg/m3 (5) 3.7 μg/m3 (15) 15.0
 
Oct. 5, 2019, noon N/A N/A N/A N/A N/A N/A 6.0 ppb (5) N/A 5.0 μg/m3 (5) 0.6 μg/m3 (2) 5.0
 
Oct. 5, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A 4.0 μg/m3 (4) 1.0 μg/m3 (4) 7.0
 
Oct. 5, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 10.0 ppb (8) N/A 4.0 μg/m3 (4) 2.2 μg/m3 (9) 9.0
 
Oct. 5, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A 4.0 μg/m3 (4) 1.6 μg/m3 (7) 7.0
 
Oct. 5, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A 5.0 μg/m3 (5) 3.1 μg/m3 (13) 13.0
 
Oct. 5, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A 4.0 μg/m3 (4) 2.4 μg/m3 (10) 10.0
 
Oct. 5, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 7.0 ppb (5) N/A 4.0 μg/m3 (4) 1.5 μg/m3 (6) 6.0
 
Oct. 5, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 7.0 ppb (5) N/A 5.0 μg/m3 (5) -0.1 μg/m3 (0) 5.0
 
Oct. 5, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 5.0 ppb (4) N/A 5.0 μg/m3 (5) -1.8 μg/m3 (0) 5.0
 
Oct. 5, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 5.0 ppb (4) N/A 7.0 μg/m3 (6) 1.5 μg/m3 (6) 6.0
 
Oct. 5, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 5.0 ppb (4) N/A 6.0 μg/m3 (5) 3.6 μg/m3 (15) 15.0
 
Oct. 5, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 5.0 ppb (4) N/A 8.0 μg/m3 (7) 3.4 μg/m3 (14) 14.0
 
Oct. 5, 2019, midnight N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A 7.0 μg/m3 (6) 3.5 μg/m3 (15) 15.0
 
Oct. 4, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 10.0 ppb (8) N/A 7.0 μg/m3 (6) 6.9 μg/m3 (29) 29.0
 
Oct. 4, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 11.0 ppb (8) N/A 7.0 μg/m3 (6) 5.4 μg/m3 (23) 23.0
 
Oct. 4, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A 6.0 μg/m3 (5) 0.7 μg/m3 (3) 9.0
 
Oct. 4, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 11.0 ppb (8) N/A 5.0 μg/m3 (5) -0.5 μg/m3 (0) 8.0
 
Oct. 4, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A 5.0 μg/m3 (5) 1.0 μg/m3 (4) 9.0
 
Oct. 4, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A 5.0 μg/m3 (5) 0.2 μg/m3 (1) 9.0
 
Oct. 4, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 13.0 ppb (10) N/A 4.0 μg/m3 (4) 2.3 μg/m3 (10) 10.0
 
Oct. 4, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A 4.0 μg/m3 (4) 2.8 μg/m3 (12) 12.0
 
Oct. 4, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 13.0 ppb (10) N/A 3.0 μg/m3 (3) 2.1 μg/m3 (9) 10.0
 
Oct. 4, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 13.0 ppb (10) N/A 3.0 μg/m3 (3) 2.8 μg/m3 (12) 12.0
 
Oct. 4, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 13.0 ppb (10) N/A 4.0 μg/m3 (4) 1.9 μg/m3 (8) 10.0
 
Oct. 4, 2019, noon N/A N/A N/A N/A N/A N/A 13.0 ppb (10) N/A 4.0 μg/m3 (4) -0.9 μg/m3 (0) 10.0
 
Oct. 4, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 14.0 ppb (11) N/A 4.0 μg/m3 (4) 0.0 μg/m3 (0) 11.0
 
Oct. 4, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 14.0 ppb (11) N/A 4.0 μg/m3 (4) 3.6 μg/m3 (15) 15.0
 
Oct. 4, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 4.0 μg/m3 (4) 2.8 μg/m3 (12) 12.0
 
Oct. 4, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A 4.0 μg/m3 (4) 0.7 μg/m3 (3) 12.0
 
Oct. 4, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A 6.0 μg/m3 (5) 2.3 μg/m3 (10) 12.0
 
Oct. 4, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A 6.0 μg/m3 (5) 4.0 μg/m3 (17) 17.0
 
Oct. 4, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A 6.0 μg/m3 (5) 4.6 μg/m3 (19) 19.0
 
Oct. 4, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 16.0 ppb (12) N/A 5.0 μg/m3 (5) 3.6 μg/m3 (15) 15.0
 
Oct. 4, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 5.0 μg/m3 (5) 3.2 μg/m3 (13) 13.0
 
Oct. 4, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 5.0 μg/m3 (5) 4.5 μg/m3 (19) 19.0
 
Oct. 4, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 5.0 μg/m3 (5) 2.4 μg/m3 (10) 13.0
 
Oct. 4, 2019, midnight N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 6.0 μg/m3 (5) 3.3 μg/m3 (14) 15.0
 
Oct. 3, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A 6.0 μg/m3 (5) 4.1 μg/m3 (17) 17.0
 
Oct. 3, 2019, 10 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) 1.2 μg/m3 (5) 16.0
 
Oct. 3, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (17) N/A 5.0 μg/m3 (5) -0.2 μg/m3 (0) 17.0
 
Oct. 3, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A 3.0 μg/m3 (3) 0.8 μg/m3 (3) 15.0
 
Oct. 3, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 3.0 μg/m3 (3) 2.3 μg/m3 (10) 13.0
 
Oct. 3, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 4.0 μg/m3 (4) 1.5 μg/m3 (6) 12.0
 
Oct. 3, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 3.0 μg/m3 (3) 0.1 μg/m3 (0) 12.0
 
Oct. 3, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 14.0 ppb (11) N/A 3.0 μg/m3 (3) 3.6 μg/m3 (15) 15.0
 
Oct. 3, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 13.0 ppb (10) N/A 4.0 μg/m3 (4) 6.2 μg/m3 (26) 26.0
 
Oct. 3, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 14.0 ppb (11) N/A 5.0 μg/m3 (5) 2.0 μg/m3 (8) 11.0
 
Oct. 3, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 8.0 ppb (6) N/A 4.0 μg/m3 (4) -0.7 μg/m3 (0) 6.0
 
Oct. 3, 2019, noon N/A N/A N/A N/A N/A N/A 8.0 ppb (6) N/A 5.0 μg/m3 (5) 0.5 μg/m3 (2) 6.0
 
Oct. 3, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 7.0 ppb (5) N/A 4.0 μg/m3 (4) 2.5 μg/m3 (10) 10.0
 
Oct. 3, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A 4.0 μg/m3 (4) 3.5 μg/m3 (15) 15.0
 
Oct. 3, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A 7.0 ppb (5) N/A 4.0 μg/m3 (4) 3.5 μg/m3 (15) 15.0
 
Oct. 3, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 5.0 ppb (4) N/A 3.0 μg/m3 (3) -1.3 μg/m3 (0) 4.0
 
Oct. 3, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 6.0 ppb (5) N/A 4.0 μg/m3 (4) -1.6 μg/m3 (0) 5.0
 
Oct. 3, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A 4.0 μg/m3 (4) -0.6 μg/m3 (0) 4.0
 
Oct. 3, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 4.0 ppb (3) N/A 4.0 μg/m3 (4) 1.0 μg/m3 (4) 4.0
 
Oct. 3, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 4.0 ppb (3) N/A 4.0 μg/m3 (4) 0.6 μg/m3 (2) 4.0
 
Oct. 3, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A 5.0 μg/m3 (5) 2.0 μg/m3 (8) 8.0
 
Oct. 3, 2019, 2 a.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A 5.0 μg/m3 (5) 3.7 μg/m3 (15) 15.0
 
Oct. 3, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A 5.0 μg/m3 (5) 1.1 μg/m3 (5) 7.0
 
Oct. 3, 2019, midnight N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A 4.0 μg/m3 (4) 0.7 μg/m3 (3) 9.0
 
Oct. 2, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 3.0 μg/m3 (3) -0.8 μg/m3 (0) 12.0
 
Oct. 2, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 3.0 μg/m3 (3) -0.8 μg/m3 (0) 13.0
 
Oct. 2, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 2.0 μg/m3 (2) 0.5 μg/m3 (2) 13.0
 
Oct. 2, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 3.0 μg/m3 (3) 2.2 μg/m3 (9) 14.0
 
Oct. 2, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A 3.0 μg/m3 (3) 3.5 μg/m3 (15) 15.0
 
Oct. 2, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 5.0 μg/m3 (5) 0.7 μg/m3 (3) 13.0
 
Oct. 2, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 4.0 μg/m3 (4) -0.7 μg/m3 (0) 14.0
 
Oct. 2, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 3.0 μg/m3 (3) -0.2 μg/m3 (0) 15.0
 
Oct. 2, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 5.0 μg/m3 (5) 0.0 μg/m3 (0) 13.0
 
Oct. 2, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 14.0 ppb (11) N/A 4.0 μg/m3 (4) 0.3 μg/m3 (1) 11.0
 
Oct. 2, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 13.0 ppb (10) N/A 4.0 μg/m3 (4) 1.2 μg/m3 (5) 10.0
 
Oct. 2, 2019, noon N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 4.0 μg/m3 (4) 3.6 μg/m3 (15) 15.0
 
Oct. 2, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 13.0 ppb (10) N/A 5.0 μg/m3 (5) 4.1 μg/m3 (17) 17.0
 
Oct. 2, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A 5.0 μg/m3 (5) 2.4 μg/m3 (10) 10.0
 
Oct. 2, 2019, 9 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) 4.0 μg/m3 (17) 17.0
 
Oct. 2, 2019, 8 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) 3.9 μg/m3 (16) 16.0
 
Oct. 2, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A 6.0 μg/m3 (5) 3.5 μg/m3 (15) 15.0
 
Oct. 2, 2019, 6 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) 4.1 μg/m3 (17) 17.0
 
Oct. 2, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A 11.0 ppb (8) N/A 7.0 μg/m3 (6) 5.3 μg/m3 (22) 22.0
 
Oct. 2, 2019, 4 a.m. N/A N/A N/A N/A N/A N/A 11.0 ppb (8) N/A 7.0 μg/m3 (6) 5.9 μg/m3 (25) 25.0
 
Oct. 2, 2019, 3 a.m. N/A N/A N/A N/A N/A N/A 13.0 ppb (10) N/A 6.0 μg/m3 (5) 6.3 μg/m3 (26) 26.0
 
Oct. 2, 2019, 2 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) 2.9 μg/m3 (12) 12.0
 
Oct. 2, 2019, 1 a.m. N/A N/A N/A N/A N/A N/A 15.0 ppb (12) N/A 7.0 μg/m3 (6) 1.2 μg/m3 (5) 12.0
 
Oct. 2, 2019, midnight N/A N/A N/A N/A N/A N/A 17.0 ppb (13) N/A 6.0 μg/m3 (5) -0.4 μg/m3 (0) 13.0
 
Oct. 1, 2019, 11 p.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (14) N/A 6.0 μg/m3 (5) 1.5 μg/m3 (6) 14.0
 
Oct. 1, 2019, 10 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 5.0 μg/m3 (5) 0.6 μg/m3 (2) 15.0
 
Oct. 1, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A 5.0 μg/m3 (5) 2.7 μg/m3 (11) 16.0
 
Oct. 1, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A 3.0 μg/m3 (3) 7.3 μg/m3 (30) 30.0
 
Oct. 1, 2019, 7 p.m. N/A N/A N/A N/A N/A N/A N/A N/A 4.0 μg/m3 (4) N/A 4.0
 
Oct. 1, 2019, 6 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Oct. 1, 2019, 5 p.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A 4.0 μg/m3 (4) 1.5 μg/m3 (6) 15.0
 
Oct. 1, 2019, 4 p.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A 3.0 μg/m3 (3) 2.3 μg/m3 (10) 15.0
 
Oct. 1, 2019, 3 p.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (15) N/A 3.0 μg/m3 (3) 1.7 μg/m3 (7) 15.0