AQSQID: 380570004

Site Name: Beulah North

Location: Mercer Co, ND

Reporting: True, Located: True

Current AQI: 19.0

Mercer Co ND, US: 47.2986, -101.7669

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
May 21, 2019, 7 a.m. 2.7 ppb (3) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 25.0 ppb (19) N/A -1.0 μg/m3 (0) 1.6 μg/m3 (7) 19.0
 
May 21, 2019, 6 a.m. 1.7 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 27.0 ppb (21) N/A -5.0 μg/m3 (0) 1.3 μg/m3 (5) 21.0
 
May 21, 2019, 5 a.m. 1.9 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 28.0 ppb (22) N/A N/A 0.1 μg/m3 (0) 22.0
 
May 21, 2019, 4 a.m. 1.7 ppb (2) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 29.0 ppb (22) N/A N/A -0.1 μg/m3 (0) 22.0
 
May 21, 2019, 3 a.m. 1.9 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 0.4 μg/m3 (2) 25.0
 
May 21, 2019, 2 a.m. 1.7 ppb (2) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 34.0 ppb (26) N/A -3.0 μg/m3 (0) 1.7 μg/m3 (7) 26.0
 
May 21, 2019, 1 a.m. 1.6 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 39.0 ppb (30) N/A 0.0 μg/m3 (0) 2.5 μg/m3 (10) 30.0
 
May 21, 2019, midnight 1.4 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 42.0 ppb (32) N/A 0.0 μg/m3 (0) 1.1 μg/m3 (5) 32.0
 
May 20, 2019, 11 p.m. 2.5 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A N/A 1.0 μg/m3 (1) 0.9 μg/m3 (4) 4.0
 
May 20, 2019, 10 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) N/A N/A 4.0 μg/m3 (4) 3.6 μg/m3 (15) 15.0
 
May 20, 2019, 9 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
May 20, 2019, 8 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (27) N/A N/A N/A 27.0
 
May 20, 2019, 7 p.m. 3.3 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 44.0 ppb (34) N/A 9.0 μg/m3 (8) 0.9 μg/m3 (4) 34.0
 
May 20, 2019, 6 p.m. 2.2 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 44.0 ppb (34) N/A 7.0 μg/m3 (6) 4.2 μg/m3 (18) 34.0
 
May 20, 2019, 5 p.m. 2.2 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 42.0 ppb (32) N/A 10.0 μg/m3 (9) 4.6 μg/m3 (19) 32.0
 
May 20, 2019, 4 p.m. 3.1 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 37.0 ppb (28) N/A 9.0 μg/m3 (8) 0.6 μg/m3 (2) 28.0
 
May 20, 2019, 3 p.m. 4.1 ppb (4) 1.5 ppb (1) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 31.0 ppb (24) N/A 8.0 μg/m3 (7) 1.2 μg/m3 (5) 24.0
 
May 20, 2019, 2 p.m. 3.0 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 24.0 ppb (18) N/A 4.0 μg/m3 (4) -0.6 μg/m3 (0) 18.0
 
May 20, 2019, 1 p.m. 2.5 ppb (2) 0.8 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 22.0 ppb (17) N/A 6.0 μg/m3 (5) -1.4 μg/m3 (0) 17.0
 
May 20, 2019, noon 2.5 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 19.0 ppb (15) N/A 8.0 μg/m3 (7) 0.0 μg/m3 (0) 15.0
 
May 20, 2019, 11 a.m. 3.7 ppb (3) 0.6 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 13.0 ppb (10) N/A 4.0 μg/m3 (4) 1.9 μg/m3 (8) 10.0
 
May 20, 2019, 10 a.m. 3.9 ppb (4) 1.4 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 21.0 ppb (16) N/A 5.0 μg/m3 (5) 2.2 μg/m3 (9) 16.0
 
May 20, 2019, 9 a.m. 3.3 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 24.0 ppb (18) N/A 6.0 μg/m3 (5) 2.9 μg/m3 (12) 18.0
 
May 20, 2019, 8 a.m. 2.6 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 24.0 ppb (18) N/A 4.0 μg/m3 (4) 3.8 μg/m3 (16) 18.0
 
May 20, 2019, 7 a.m. 2.1 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 25.0 ppb (19) N/A 1.0 μg/m3 (1) -0.4 μg/m3 (0) 19.0
 
May 20, 2019, 6 a.m. 2.2 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 25.0 ppb (19) N/A 1.0 μg/m3 (1) 0.8 μg/m3 (3) 19.0
 
May 20, 2019, 5 a.m. 3.2 ppb (3) 0.8 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 25.0 ppb (19) N/A -2.0 μg/m3 (0) 2.9 μg/m3 (12) 19.0
 
May 20, 2019, 4 a.m. 2.7 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 24.0 ppb (18) N/A N/A 3.5 μg/m3 (15) 18.0
 
May 20, 2019, 3 a.m. 3.1 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 24.0 ppb (18) N/A N/A 0.6 μg/m3 (2) 18.0
 
May 20, 2019, 2 a.m. 2.9 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 30.0 ppb (23) N/A -4.0 μg/m3 (0) -2.3 μg/m3 (0) 23.0
 
May 20, 2019, 1 a.m. 1.7 ppb (2) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 32.0 ppb (25) N/A 2.0 μg/m3 (2) -0.4 μg/m3 (0) 25.0
 
May 20, 2019, midnight 1.7 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 35.0 ppb (27) N/A 3.0 μg/m3 (3) 0.0 μg/m3 (0) 27.0
 
May 19, 2019, 11 p.m. 2.0 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 35.0 ppb (27) N/A 7.0 μg/m3 (6) -2.0 μg/m3 (0) 27.0
 
May 19, 2019, 10 p.m. 3.4 ppb (3) 1.7 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 36.0 ppb (28) N/A 11.0 μg/m3 (10) -2.6 μg/m3 (0) 28.0
 
May 19, 2019, 9 p.m. 1.7 ppb (2) 0.8 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 39.0 ppb (30) N/A -3.0 μg/m3 (0) -1.2 μg/m3 (0) 30.0
 
May 19, 2019, 8 p.m. 1.3 ppb (1) 0.6 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 38.0 ppb (29) N/A 4.0 μg/m3 (4) 1.0 μg/m3 (4) 29.0
 
May 19, 2019, 7 p.m. 1.5 ppb (1) 0.5 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 36.0 ppb (28) N/A 12.0 μg/m3 (11) 2.0 μg/m3 (8) 28.0
 
May 19, 2019, 6 p.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 33.0 ppb (25) N/A 5.0 μg/m3 (5) 1.8 μg/m3 (8) 25.0
 
May 19, 2019, 5 p.m. 1.2 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 33.0 ppb (25) N/A 4.0 μg/m3 (4) 1.3 μg/m3 (5) 25.0
 
May 19, 2019, 4 p.m. 1.2 ppb (1) 0.8 ppb (1) N/A 0.0 ppb (0) N/A 0.0 ppb (0) 32.0 ppb (25) N/A 5.0 μg/m3 (5) 0.5 μg/m3 (2) 25.0
 
May 19, 2019, 3 p.m. 2.1 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 30.0 ppb (23) N/A 7.0 μg/m3 (6) 1.2 μg/m3 (5) 23.0
 
May 19, 2019, 2 p.m. 1.7 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 25.0 ppb (19) N/A 5.0 μg/m3 (5) 3.8 μg/m3 (16) 19.0
 
May 19, 2019, 1 p.m. 1.9 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 22.0 ppb (17) N/A 2.0 μg/m3 (2) 5.3 μg/m3 (22) 22.0
 
May 19, 2019, noon 2.3 ppb (2) 0.9 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 21.0 ppb (16) N/A 3.0 μg/m3 (3) 2.8 μg/m3 (12) 16.0
 
May 19, 2019, 11 a.m. 1.9 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 21.0 ppb (16) N/A 4.0 μg/m3 (4) 2.1 μg/m3 (9) 16.0
 
May 19, 2019, 10 a.m. 1.6 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 21.0 ppb (16) N/A 4.0 μg/m3 (4) 1.5 μg/m3 (6) 16.0
 
May 19, 2019, 9 a.m. 1.6 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 23.0 ppb (18) N/A 4.0 μg/m3 (4) 3.6 μg/m3 (15) 18.0
 
May 19, 2019, 8 a.m. 1.2 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 25.0 ppb (19) N/A 6.0 μg/m3 (5) 4.7 μg/m3 (20) 20.0
 
May 19, 2019, 7 a.m. 1.3 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 26.0 ppb (20) N/A 8.0 μg/m3 (7) 1.2 μg/m3 (5) 20.0
 
May 19, 2019, 6 a.m. 1.2 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 27.0 ppb (21) N/A 4.0 μg/m3 (4) 1.4 μg/m3 (6) 21.0
 
May 19, 2019, 5 a.m. 1.2 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 28.0 ppb (22) N/A 4.0 μg/m3 (4) 0.4 μg/m3 (2) 22.0
 
May 19, 2019, 4 a.m. 1.5 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 28.0 ppb (22) N/A 3.0 μg/m3 (3) 0.4 μg/m3 (2) 22.0
 
May 19, 2019, 3 a.m. 1.4 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 29.0 ppb (22) N/A 1.0 μg/m3 (1) 1.9 μg/m3 (8) 22.0
 
May 19, 2019, 2 a.m. 1.5 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 30.0 ppb (23) N/A 3.0 μg/m3 (3) 1.6 μg/m3 (7) 23.0
 
May 19, 2019, 1 a.m. 1.7 ppb (2) 0.9 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 31.0 ppb (24) N/A 1.0 μg/m3 (1) 1.4 μg/m3 (6) 24.0
 
May 19, 2019, midnight 1.8 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 32.0 ppb (25) N/A -1.0 μg/m3 (0) 1.8 μg/m3 (8) 25.0
 
May 18, 2019, 11 p.m. 2.2 ppb (2) 1.1 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 31.0 ppb (24) N/A 0.0 μg/m3 (0) 2.4 μg/m3 (10) 24.0
 
May 18, 2019, 10 p.m. 2.0 ppb (2) 0.8 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 29.0 ppb (22) N/A 5.0 μg/m3 (5) 5.2 μg/m3 (22) 22.0
 
May 18, 2019, 9 p.m. 2.3 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 29.0 ppb (22) N/A 8.0 μg/m3 (7) 5.5 μg/m3 (23) 23.0
 
May 18, 2019, 8 p.m. 1.7 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 29.0 ppb (22) N/A 3.0 μg/m3 (3) 3.1 μg/m3 (13) 22.0
 
May 18, 2019, 7 p.m. 1.4 ppb (1) 0.7 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 27.0 ppb (21) N/A 7.0 μg/m3 (6) 3.1 μg/m3 (13) 21.0
 
May 18, 2019, 6 p.m. 1.6 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 26.0 ppb (20) N/A 5.0 μg/m3 (5) 3.3 μg/m3 (14) 20.0
 
May 18, 2019, 5 p.m. 2.2 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 24.0 ppb (18) N/A 6.0 μg/m3 (5) 2.6 μg/m3 (11) 18.0
 
May 18, 2019, 4 p.m. 2.4 ppb (2) 0.9 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 22.0 ppb (17) N/A 6.0 μg/m3 (5) 2.0 μg/m3 (8) 17.0
 
May 18, 2019, 3 p.m. 2.5 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 21.0 ppb (16) N/A 3.0 μg/m3 (3) 0.9 μg/m3 (4) 16.0
 
May 18, 2019, 2 p.m. 1.5 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 22.0 ppb (17) N/A 2.0 μg/m3 (2) 0.8 μg/m3 (3) 17.0
 
May 18, 2019, 1 p.m. 1.8 ppb (2) 0.6 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 23.0 ppb (18) N/A -1.0 μg/m3 (0) 2.3 μg/m3 (10) 18.0
 
May 18, 2019, noon 1.3 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 29.0 ppb (22) N/A -1.0 μg/m3 (0) 2.5 μg/m3 (10) 22.0
 
May 18, 2019, 11 a.m. 1.8 ppb (2) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 33.0 ppb (25) N/A 5.0 μg/m3 (5) 2.4 μg/m3 (10) 25.0
 
May 18, 2019, 10 a.m. 1.4 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 30.0 ppb (23) N/A 7.0 μg/m3 (6) 0.8 μg/m3 (3) 23.0
 
May 18, 2019, 9 a.m. 1.3 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 35.0 ppb (27) N/A 3.0 μg/m3 (3) 2.2 μg/m3 (9) 27.0
 
May 18, 2019, 8 a.m. 0.9 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 38.0 ppb (29) N/A 5.0 μg/m3 (5) 3.9 μg/m3 (16) 29.0
 
May 18, 2019, 7 a.m. 1.1 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 37.0 ppb (28) N/A 3.0 μg/m3 (3) 5.0 μg/m3 (21) 28.0
 
May 18, 2019, 6 a.m. 2.0 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 34.0 ppb (26) N/A 3.0 μg/m3 (3) 4.5 μg/m3 (19) 26.0
 
May 18, 2019, 5 a.m. 1.9 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 36.0 ppb (28) N/A -2.0 μg/m3 (0) 3.6 μg/m3 (15) 28.0
 
May 18, 2019, 4 a.m. 2.7 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 37.0 ppb (28) N/A -3.0 μg/m3 (0) 7.3 μg/m3 (30) 30.0
 
May 18, 2019, 3 a.m. 2.4 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 30.0 ppb (23) N/A -1.0 μg/m3 (0) 7.6 μg/m3 (32) 32.0
 
May 18, 2019, 2 a.m. 3.9 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 25.0 ppb (19) N/A -3.0 μg/m3 (0) 6.7 μg/m3 (28) 28.0
 
May 18, 2019, 1 a.m. 5.1 ppb (5) 1.7 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 25.0 ppb (19) N/A -1.0 μg/m3 (0) 4.5 μg/m3 (19) 19.0
 
May 18, 2019, midnight 6.7 ppb (6) 1.8 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 25.0 ppb (19) N/A 3.0 μg/m3 (3) 2.0 μg/m3 (8) 19.0
 
May 17, 2019, 11 p.m. 4.0 ppb (4) 2.3 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 28.0 ppb (22) N/A 2.0 μg/m3 (2) 1.0 μg/m3 (4) 22.0
 
May 17, 2019, 10 p.m. 4.5 ppb (4) 1.8 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 29.0 ppb (22) N/A 5.0 μg/m3 (5) 1.7 μg/m3 (7) 22.0
 
May 17, 2019, 9 p.m. 5.1 ppb (5) 2.5 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 29.0 ppb (22) N/A 7.0 μg/m3 (6) 1.2 μg/m3 (5) 22.0
 
May 17, 2019, 8 p.m. 4.6 ppb (4) 2.2 ppb (2) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 30.0 ppb (23) N/A 4.0 μg/m3 (4) 1.5 μg/m3 (6) 23.0
 
May 17, 2019, 7 p.m. 5.1 ppb (5) 2.7 ppb (3) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 28.0 ppb (22) N/A 4.0 μg/m3 (4) 2.8 μg/m3 (12) 22.0
 
May 17, 2019, 6 p.m. 5.5 ppb (5) 2.7 ppb (3) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 25.0 ppb (19) N/A 3.0 μg/m3 (3) 2.2 μg/m3 (9) 19.0
 
May 17, 2019, 5 p.m. 3.6 ppb (3) 1.9 ppb (2) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 26.0 ppb (20) N/A 1.0 μg/m3 (1) 2.6 μg/m3 (11) 20.0
 
May 17, 2019, 4 p.m. 6.5 ppb (6) 1.8 ppb (2) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 26.0 ppb (20) N/A 1.0 μg/m3 (1) 1.9 μg/m3 (8) 20.0
 
May 17, 2019, 3 p.m. 3.1 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 29.0 ppb (22) N/A 1.0 μg/m3 (1) 2.3 μg/m3 (10) 22.0
 
May 17, 2019, 2 p.m. 4.2 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 26.0 ppb (20) N/A 2.0 μg/m3 (2) 2.0 μg/m3 (8) 20.0
 
May 17, 2019, 1 p.m. 5.2 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 23.0 ppb (18) N/A 1.0 μg/m3 (1) 0.0 μg/m3 (0) 18.0
 
May 17, 2019, noon 5.2 ppb (5) 1.3 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 23.0 ppb (18) N/A -1.0 μg/m3 (0) 0.5 μg/m3 (2) 18.0
 
May 17, 2019, 11 a.m. 3.3 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 27.0 ppb (21) N/A -2.0 μg/m3 (0) -1.0 μg/m3 (0) 21.0
 
May 17, 2019, 10 a.m. 2.5 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 29.0 ppb (22) N/A 2.0 μg/m3 (2) 0.6 μg/m3 (2) 22.0
 
May 17, 2019, 9 a.m. 5.1 ppb (5) 0.3 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 28.0 ppb (22) N/A 6.0 μg/m3 (5) 5.9 μg/m3 (25) 25.0
 
May 17, 2019, 8 a.m. 5.0 ppb (5) 0.2 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 29.0 ppb (22) N/A 7.0 μg/m3 (6) 8.8 μg/m3 (37) 37.0
 
May 17, 2019, 7 a.m. 5.2 ppb (5) 0.3 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 31.0 ppb (24) N/A 7.0 μg/m3 (6) 7.1 μg/m3 (30) 30.0
 
May 17, 2019, 6 a.m. 6.0 ppb (6) 0.4 ppb (0) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 32.0 ppb (25) N/A 7.0 μg/m3 (6) 2.7 μg/m3 (11) 25.0
 
May 17, 2019, 5 a.m. 3.9 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 35.0 ppb (27) N/A 10.0 μg/m3 (9) 5.9 μg/m3 (25) 27.0
 
May 17, 2019, 4 a.m. 5.8 ppb (5) 0.7 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 36.0 ppb (28) N/A 4.0 μg/m3 (4) 7.6 μg/m3 (32) 32.0
 
May 17, 2019, 3 a.m. 9.3 ppb (9) 2.6 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 37.0 ppb (28) N/A -2.0 μg/m3 (0) 5.2 μg/m3 (22) 28.0
 
May 17, 2019, 2 a.m. 3.3 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 41.0 ppb (32) N/A N/A 1.3 μg/m3 (5) 32.0
 
May 17, 2019, 1 a.m. 4.2 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 39.0 ppb (30) N/A 0.0 μg/m3 (0) 0.9 μg/m3 (4) 30.0
 
May 17, 2019, midnight 4.7 ppb (4) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) N/A 1.0 μg/m3 (1) 2.0 μg/m3 (8) 32.0
 
May 16, 2019, 11 p.m. 4.8 ppb (4) 1.8 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) N/A 5.0 μg/m3 (5) 3.5 μg/m3 (15) 33.0
 
May 16, 2019, 10 p.m. 3.8 ppb (4) 2.5 ppb (2) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 42.0 ppb (32) N/A 10.0 μg/m3 (9) 4.0 μg/m3 (17) 32.0
 
May 16, 2019, 9 p.m. 2.9 ppb (3) 1.6 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 42.0 ppb (32) N/A 9.0 μg/m3 (8) 1.1 μg/m3 (5) 32.0
 
May 16, 2019, 8 p.m. 4.7 ppb (4) 2.6 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 40.0 ppb (31) N/A 9.0 μg/m3 (8) -2.4 μg/m3 (0) 31.0
 
May 16, 2019, 7 p.m. 3.2 ppb (3) 1.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 39.0 ppb (30) N/A 6.0 μg/m3 (5) -0.5 μg/m3 (0) 30.0
 
May 16, 2019, 6 p.m. 3.4 ppb (3) 1.8 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 36.0 ppb (28) N/A 10.0 μg/m3 (9) 0.5 μg/m3 (2) 28.0
 
May 16, 2019, 5 p.m. 3.7 ppb (3) 1.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 34.0 ppb (26) N/A 3.0 μg/m3 (3) 0.9 μg/m3 (4) 26.0
 
May 16, 2019, 4 p.m. 4.1 ppb (4) 1.9 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (25) N/A 2.0 μg/m3 (2) 2.9 μg/m3 (12) 25.0
 
May 16, 2019, 3 p.m. 2.4 ppb (2) 1.1 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 31.0 ppb (24) N/A 1.0 μg/m3 (1) 3.9 μg/m3 (16) 24.0
 
May 16, 2019, 2 p.m. 2.6 ppb (2) 1.7 ppb (2) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A 2.6 μg/m3 (11) 24.0
 
May 16, 2019, 1 p.m. 3.5 ppb (3) 0.8 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 2.5 μg/m3 (10) 25.0
 
May 16, 2019, noon 2.3 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 30.0 ppb (23) N/A 1.0 μg/m3 (1) 4.6 μg/m3 (19) 23.0
 
May 16, 2019, 11 a.m. 2.4 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 29.0 ppb (22) N/A 0.0 μg/m3 (0) 6.3 μg/m3 (26) 26.0
 
May 16, 2019, 10 a.m. 2.5 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 25.0 ppb (19) N/A -2.0 μg/m3 (0) 7.5 μg/m3 (31) 31.0
 
May 16, 2019, 9 a.m. 2.6 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 24.0 ppb (18) N/A 6.0 μg/m3 (5) 8.6 μg/m3 (36) 36.0
 
May 16, 2019, 8 a.m. 3.2 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 25.0 ppb (19) N/A 10.0 μg/m3 (9) 8.8 μg/m3 (37) 37.0
 
May 16, 2019, 7 a.m. 3.9 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 27.0 ppb (21) N/A 10.0 μg/m3 (9) 11.2 μg/m3 (47) 47.0
 
May 16, 2019, 6 a.m. 3.5 ppb (3) 0.9 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 32.0 ppb (25) N/A 6.0 μg/m3 (5) 8.4 μg/m3 (35) 35.0
 
May 16, 2019, 5 a.m. 3.7 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 37.0 ppb (28) N/A 3.0 μg/m3 (3) 4.9 μg/m3 (20) 28.0
 
May 16, 2019, 4 a.m. 8.9 ppb (8) 0.3 ppb (0) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 37.0 ppb (28) N/A 2.0 μg/m3 (2) 2.5 μg/m3 (10) 28.0
 
May 16, 2019, 3 a.m. 6.2 ppb (6) 0.7 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 38.0 ppb (29) N/A 3.0 μg/m3 (3) 4.0 μg/m3 (17) 29.0
 
May 16, 2019, 2 a.m. 10.3 ppb (10) 2.4 ppb (2) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 39.0 ppb (30) N/A 6.0 μg/m3 (5) 7.0 μg/m3 (29) 30.0
 
May 16, 2019, 1 a.m. 8.7 ppb (8) 1.6 ppb (1) N/A 7.0 ppb (6) N/A 1.0 ppb (1) 43.0 ppb (33) N/A 9.0 μg/m3 (8) 8.4 μg/m3 (35) 35.0
 
May 16, 2019, midnight 5.7 ppb (5) 1.8 ppb (2) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 53.0 ppb (41) N/A 5.0 μg/m3 (5) 5.4 μg/m3 (23) 41.0
 
May 15, 2019, 11 p.m. 4.1 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 53.0 ppb (41) N/A 8.0 μg/m3 (7) 4.2 μg/m3 (18) 41.0
 
May 15, 2019, 10 p.m. 4.6 ppb (4) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 2.0 ppb (3) 49.0 ppb (38) N/A 9.0 μg/m3 (8) 1.4 μg/m3 (6) 38.0
 
May 15, 2019, 9 p.m. 3.1 ppb (3) 1.2 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 48.0 ppb (37) N/A 18.0 μg/m3 (16) 3.0 μg/m3 (12) 37.0
 
May 15, 2019, 8 p.m. 1.6 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 50.0 ppb (38) N/A 7.0 μg/m3 (6) 7.2 μg/m3 (30) 38.0
 
May 15, 2019, 7 p.m. 1.5 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 49.0 ppb (38) N/A 10.0 μg/m3 (9) 8.8 μg/m3 (37) 38.0
 
May 15, 2019, 6 p.m. 1.7 ppb (2) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 1.0 ppb (1) 48.0 ppb (37) N/A 13.0 μg/m3 (12) 8.5 μg/m3 (35) 37.0
 
May 15, 2019, 5 p.m. 1.9 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 47.0 ppb (36) N/A 14.0 μg/m3 (13) 9.0 μg/m3 (38) 38.0
 
May 15, 2019, 4 p.m. 2.3 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 47.0 ppb (36) N/A 11.0 μg/m3 (10) 9.6 μg/m3 (40) 40.0
 
May 15, 2019, 3 p.m. 2.4 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (34) N/A 10.0 μg/m3 (9) 10.4 μg/m3 (43) 43.0
 
May 15, 2019, 2 p.m. 2.4 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (33) N/A 8.0 μg/m3 (7) 10.2 μg/m3 (42) 42.0
 
May 15, 2019, 1 p.m. 2.6 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 38.0 ppb (29) N/A 10.0 μg/m3 (9) 11.2 μg/m3 (47) 47.0
 
May 15, 2019, noon 2.7 ppb (3) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 35.0 ppb (27) N/A 10.0 μg/m3 (9) 8.8 μg/m3 (37) 37.0
 
May 15, 2019, 11 a.m. 2.7 ppb (3) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 35.0 ppb (27) N/A 14.0 μg/m3 (13) 9.5 μg/m3 (40) 40.0
 
May 15, 2019, 10 a.m. 2.6 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 35.0 ppb (27) N/A 9.0 μg/m3 (8) 6.8 μg/m3 (28) 28.0
 
May 15, 2019, 9 a.m. 2.7 ppb (3) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 37.0 ppb (28) N/A 8.0 μg/m3 (7) 6.8 μg/m3 (28) 28.0
 
May 15, 2019, 8 a.m. 3.2 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 37.0 ppb (28) N/A 8.0 μg/m3 (7) 6.3 μg/m3 (26) 28.0
 
May 15, 2019, 7 a.m. 4.1 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 38.0 ppb (29) N/A 4.0 μg/m3 (4) 5.9 μg/m3 (25) 29.0
 
May 15, 2019, 6 a.m. 4.1 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 39.0 ppb (30) N/A 2.0 μg/m3 (2) 5.2 μg/m3 (22) 30.0
 
May 15, 2019, 5 a.m. 3.7 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) N/A 6.0 μg/m3 (5) 8.2 μg/m3 (34) 34.0
 
May 15, 2019, 4 a.m. 5.2 ppb (5) 0.3 ppb (0) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 42.0 ppb (32) N/A 5.0 μg/m3 (5) 8.5 μg/m3 (35) 35.0
 
May 15, 2019, 3 a.m. 13.0 ppb (12) 1.8 ppb (2) N/A 11.0 ppb (10) N/A 1.0 ppb (1) 37.0 ppb (28) N/A 3.0 μg/m3 (3) 6.8 μg/m3 (28) 28.0
 
May 15, 2019, 2 a.m. 16.0 ppb (15) 2.5 ppb (2) N/A 14.0 ppb (13) N/A 0.0 ppb (0) 34.0 ppb (26) N/A 4.0 μg/m3 (4) 6.2 μg/m3 (26) 26.0
 
May 15, 2019, 1 a.m. 8.0 ppb (7) 0.8 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 46.0 ppb (35) N/A 5.0 μg/m3 (5) 5.1 μg/m3 (21) 35.0
 
May 15, 2019, midnight 5.5 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 55.0 ppb (42) N/A 5.0 μg/m3 (5) 4.0 μg/m3 (17) 42.0
 
May 14, 2019, 11 p.m. 4.5 ppb (4) 2.4 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 58.0 ppb (45) N/A 4.0 μg/m3 (4) 3.5 μg/m3 (15) 45.0
 
May 14, 2019, 10 p.m. 4.1 ppb (4) 2.3 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 58.0 ppb (45) N/A 6.0 μg/m3 (5) 5.9 μg/m3 (25) 45.0
 
May 14, 2019, 9 p.m. 3.6 ppb (3) 2.2 ppb (2) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 57.0 ppb (44) N/A 7.0 μg/m3 (6) 6.8 μg/m3 (28) 44.0
 
May 14, 2019, 8 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 57.0 ppb (44) N/A 3.0 μg/m3 (3) 5.9 μg/m3 (25) 44.0
 
May 14, 2019, 7 p.m. 5.7 ppb (5) 2.6 ppb (2) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 57.0 ppb (44) N/A 5.0 μg/m3 (5) 4.4 μg/m3 (18) 44.0
 
May 14, 2019, 6 p.m. 3.3 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 56.0 ppb (43) N/A 9.0 μg/m3 (8) 5.5 μg/m3 (23) 43.0
 
May 14, 2019, 5 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 55.0 ppb (42) N/A 14.0 μg/m3 (13) 7.0 μg/m3 (29) 42.0
 
May 14, 2019, 4 p.m. 4.2 ppb (4) 1.7 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 53.0 ppb (41) N/A 9.0 μg/m3 (8) 6.6 μg/m3 (28) 41.0
 
May 14, 2019, 3 p.m. 3.9 ppb (4) 1.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (38) N/A 10.0 μg/m3 (9) 5.5 μg/m3 (23) 38.0
 
May 14, 2019, 2 p.m. 4.6 ppb (4) 1.8 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 46.0 ppb (35) N/A 11.0 μg/m3 (10) 7.2 μg/m3 (30) 35.0
 
May 14, 2019, 1 p.m. 5.9 ppb (5) 3.1 ppb (3) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 39.0 ppb (30) N/A 0.0 μg/m3 (0) 6.0 μg/m3 (25) 30.0
 
May 14, 2019, noon 4.1 ppb (4) 1.4 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 37.0 ppb (28) N/A -1.0 μg/m3 (0) 5.4 μg/m3 (23) 28.0
 
May 14, 2019, 11 a.m. 5.5 ppb (5) 1.8 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 34.0 ppb (26) N/A 3.0 μg/m3 (3) 7.9 μg/m3 (33) 33.0
 
May 14, 2019, 10 a.m. 4.1 ppb (4) 1.4 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 29.0 ppb (22) N/A 6.0 μg/m3 (5) 6.3 μg/m3 (26) 26.0
 
May 14, 2019, 9 a.m. 3.6 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 32.0 ppb (25) N/A 5.0 μg/m3 (5) 5.5 μg/m3 (23) 25.0
 
May 14, 2019, 8 a.m. 4.0 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 34.0 ppb (26) N/A 7.0 μg/m3 (6) 6.5 μg/m3 (27) 27.0